Dwyer Instruments UL series Montage- und Bedienungsanleitung

Series UL Transmitters

Specifications - Installation and Operating Instructions

Bulletin L-UL

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: [email protected]

L-UL:SSS-1000 12/15/10 8:56 AM Page 1

Table of Contents

Chapter 1. Introduction

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Measuring Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Chapter 2. Installation

Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Installing the Unit on Threaded Flange/Thread-Free Flange . . . . . . . . . . . . . . . .3

Installing the Unit via Extension Pipes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Using a Conduit Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Non-Intrinsically Safe Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Power Supply and Load Resistance Recommendations . . . . . . . . . . . . . . . . . . .4

Chapter 3. Set Up

Series UL Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Set Up and Function Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Resetting the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Entering Distance to Empty Level (Tank Height) . . . . . . . . . . . . . . . . . . . . . . . . . .6

Defining Interfering Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Configuring 4 mA Current Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Configuring 20 mA Current Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Selecting Low/High Dynamic Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Defining Working Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Selecting Distance or Level Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Entering Factor for Gas Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Restoring the Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Shifting the Blocking Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Verifying the Version Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Defining 22 mA Signal Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Chapter 4. Open Channels (ULF)

Selecting the Flow Measurement Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Open Channel Flow Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Flume/Weir Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Flumes/Weirs - European Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Rectangular Suppressed Sharp - Crested Weir (Type 1) . . . . . . . . . . . . . . . . . .11

Rectangular Contracted Sharp - Crested Weir (Type 2) . . . . . . . . . . . . . . . . . . .11

Trapezoidal (Cipolletti) Sharp - Crested Weir (Type 3) . . . . . . . . . . . . . . . . . . . .11

V-Notch (Triangular) Sharp - Crested Weir (Type 4) . . . . . . . . . . . . . . . . . . . . . .11

Khafagi-Venturi Flume (Type 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Parshall Flume (Type 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Palmer Bowlus Flume Trapezoidal Throat Cross-Selection (Type 7) . . . . . . . . .12

H Flume (Type 8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Neyrpic Venturi Flume/Long-Base Weir (Type 9) . . . . . . . . . . . . . . . . . . . . . . . .13

Flumes/Weirs – American Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Rectangular Suppressed Sharp - Crested Weir (Type 1) . . . . . . . . . . . . . . . . . .13

Rectangular Contracted Sharp - Crested Weir (Type 2) . . . . . . . . . . . . . . . . . .13

Trapezoidal (Cipolletti) Sharp - Crested Weir (Type 3) . . . . . . . . . . . . . . . . . . . .13

V-Notch (Triangular) Sharp - Crested Weir (Type 4) . . . . . . . . . . . . . . . . . . . . . .13

Parshall Flume (Type 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Palmer Bowlus Flume Trapezoidal Throat Cross-Selection (Type 6) . . . . . . . . .14

H Flume (Type 7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Leopold-Lagco Flume (Type 8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Chapter 5. Troubleshooting

22 mA Signal Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Appendix A – Gas Factor Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Appendix B – Installation Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Appendix C – Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Table of Figures

Figure 1: Front and Side View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Figure 2: Threaded Flange/ Thread - Free Flange Monitoring . . . . . . . . . . . . . . . . .3

Figure 3: Extension Pipe Recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Figure 4: Conduit Adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Figure 5: Non-Intrinsically Safe Positive Ground Connection . . . . . . . . . . . . . . . . . .4

Figure 6: Non-Intrinsically Safe Negative Ground Connection . . . . . . . . . . . . . . . . .4

Figure 7: Functions Menus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Figure 8: Display and Function Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Figure 9: Scan Distance Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Figure 10: Defining Working Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Figure 11: Rectangular Suppressed Sharp - Crested Weir . . . . . . . . . . . . . . . . . . .11

Figure 12: Rectangular Contracted Sharp - Crested Weir . . . . . . . . . . . . . . . . . . . .11

Figure 13: Trapezoidal (Cipolletti) Sharp - Crested Weir . . . . . . . . . . . . . . . . . . . . .11

Figure 14: V-Notch (Triangular) Sharp - Crested Weir . . . . . . . . . . . . . . . . . . . . . . .11

Figure 15: Khafagi-Venturi Flume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Figure 16: Parshall Flume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Figure 17: Palmer Bowlus Flume Trapezoidal Throat

Cross-Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Figure 18: H Flume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Figure 19: Neyrpic Venture Flume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Figure 20: Long-Base Weir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Figure 21: Rectangular Suppresses Sharp - Crested Weir . . . . . . . . . . . . . . . . . . .13

Figure 22: Rectangular Contracted Sharp - Crested Weir . . . . . . . . . . . . . . . . . . .13

Figure 23: Trapeziodal (Cipolletti) Sharp - Crusted Weir . . . . . . . . . . . . . . . . . . . . .13

Figure 24: V-Notch (Triangular) Sharp - Crested Weir . . . . . . . . . . . . . . . . . . . . . . .13

Figure 25: Parshall Flume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Figure 26: Palmer Boweus Flume Trapezoidal Throat

Cross-Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Figure 27: H Flume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Figure 28: Leopold Lagco Flume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Figure 29: Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

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Chapter 1: Introduction

The UL is an ultrasonic, continuous-level measurement gage. The unit is available

in two separate series: The Series ULB for solids and the Series ULF for fluids.

Depending on the series, the unit can be used for the following measurement tasks:

• Dust-free tanks with solids

• Open channel flow

• Liquid tanks with calm surfaces (upon request)

The ULF unit has a range of up to 49.21 ft (15 m) with an accuracy of 0.25% of the

maximum measuring range (version dependent).

The ULB unit has a range of up to 28 ft (8.5 m) with an accuracy of 0.25% of the

maximum measuring range (version dependent).

SPECIFICATIONS

Service: ULB: Bulk solids, ULF: Compatible liquids.

Wetted Materials: Sensor: Polypropylene, Acoustic Window: ECTFE.

Ranges: (see “Measuring Ranges”).

Accuracy: 0.25% of max range (at 20°C).

Resolution: 0.04˝ (1 mm).

Blind Zone: ULB-11 and ULF-X1-XXX: 0.8 ft (.25 m); ULB-12 and ULB-X2-XXX:

1.96 ft (0.6 m).

Beam Angle: 5° @ 3db point.

Temperature Limits: -40 to 158°F (-40 to 70°C).

Temperature Compensation: Automatic.

Pressure Limits: 13.5 psi (0.9 bar) to 30 psi (2 bar).

Power Requirement: 18 to 28 VDC.

Output Signal: 4 to 20 mA.

Max. Loop Resistance: 750 Ω at 28 VDC.

Electrical Connection: Screw terminal.

Conduit Connection: 1/2˝ NPT conduit or cable gland (optional).

Process Connection: 2˝ NPT or 2˝ BSP (optional).

Enclosure: Plastic enclosure: ABS and UV resistant body.

Enclosure Rating: NEMA 4 (IP65).

Mounting Orientation: Vertical.

Memory: Non-volatile.

Display: 4 character LCD.

Units: ft, m (upon request).

Programming: 4 button.

Weight: 3.1 lb (1.4 kg).

Measuring Ranges

Page 2

ULB for solids

ULF for fluids

Standard

Extended

Range

Short

Range

Standard

0.82 ft to 11.5 ft

0.25 m to 3.5 m

1.96 ft to 28 ft

0.6 m to 8.5 m

0.82 ft to 16.4 ft

0.25 m to 5 m

1.96 ft to 49.2 ft

0.6 m to 15 m

Figure 1 : Front and Side View

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Chapter 2: Installing the Unit

Precautions

• Ensure that the unit is mounted in an area that meets the stated temperature,

pressure and technical specifications.

• Ensure that high-voltage sources or cables are at least 40˝ (1 m) away from the

sensor and its cable.

• Use round cables with minimum diameter of 0.24 to 0.28˝ (6 to 7 mm) to ensure

that the unit remains sealed per IP65 standards.

• Ensure that cables are routed correctly and tightened along walls or pipes.

• Installation and operation of this product should be performed, according to the

Product User Manual and Product Certification. Otherwise the use of this product

is prohibited.

When installing the unit ensure that it is:

• Mounted above the dead-zone area.

NOTE: If the device enters the blocking distance (dead

zone), it will not measure correctly.

• Positioned at least 1.64 ft (0.5 m) away from the tank walls.

Add 4˝ (10 cm) spacing for each 40˝ (1 m) in range.

• Perpendicular to the surface of the target.

NOTE: Even the slightest difference in angle may affect echo

quality.

• Placed as far as possible from noisy areas, such as a filling

inlet.

NOTE: When installed in a humid environment it is

recommended to position the sensor on a tripod on top of the

vessel.

Installing the Unit on Threaded Flange/Thread-Free Flange

The unit is available in 2˝ NPT or 2˝ BSP (upon request).

The unit can be installed with threaded-flange mounting or with thread-free flange

mounting, as shown below:

Figure 2: Threaded Flange/Thread-Free Flange Mounting

NOTE: When installing a thread-free flange mounted unit, you will need a 2˝

(50.8 mm) locking nut to secure the unit inside the tank.

To Install the Unit:

1. Insert the threaded end of the unit into the opening at the top of the tank or pipe.

2. Bolt the unit into place in one of the following ways:

•Threaded-flange mounting: Screw the unit into a flange with a threaded

2˝ (50.8 mm) hole.

•Thread-free mounting: Place the unit in the flange, and bolt it from within

the tank with a 2˝ (50.8 mm) locking nut.

NOTE: Tighten nut hand tight only. When tightening the nut, hold the lower part of

the unit. Make sure that the seal is leak proof.

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Installing the Unit Via Extension Pipes

If the level of the measured surface falls within the dead-zone area, you should use

an extension pipe to mount the unit.

When using an extension pipe, ensure that:

• The sensor is positioned in the center of the pipe.

• The pipe extension is exactly perpendicular to the surface

of the target.

• The internal pipe diameter is at least 3.0˝ (76.2 mm) wide.

• The pipe is preferably made of plastic and must have a

smooth interior surface.

• The pipe should not protrude inside the tank.

• The tank drilling should be at least the size of the internal

pipe diameter and have a smooth edge.

When installing the unit with extension pipes, measure from sensor’s lower edge

and follow these specifications:

NOTE:

1. It is always recommended to use interference signal feature (Pr03) to locate

interfering signals when using an extension pipe.

2. The sensor's lower edge may be

a) aligned with the extension pipe's upper edge or

b) protrude it by up to 2.56˝ (6.5 cm). See Figure 3 below:

Figure 3: Extension Pipe Recommendation

Using a Conduit Adapter

1. Remove the four retaining screws from the conduit adapter cover.

2. Pull the electrical wires through the 1/2˝ NPT conduit connection.

3. Connect the -24 V wire to Terminal 1, connect the +24 V wire to Terminal 2 on

the wiring block.

4. Return the adapter's cover to its place properly. Make sure that the O-ring is

placed correctly. Fasten the four retaining screws.

Figure 4: Conduit Adapter

NOTE: The conduit adapter should not exceed a torque of 50 lb-in.

To maintain a proper seal, make sure that conduit is firmly screwed to the conduit's

adaptor.

Non-Intrinsically Safe Connections

Figure 5: Non-Intrinsically Safe Positive Ground Connection

Figure 6: Non-Intrinsically Safe Negative Ground Connection

Power Supply and Load Resistance Recommendations

The following table specifies the recommended resistance range for each power

supply voltage (Non-Intrinsically Safe).

NOTE: The resistance value is the total sum of the series resistor (or PLC

resistance) and the lines resistance. The minimum voltage level on terminals

should not be less that 15 VDC.

To maintain a proper seal, make sure that conduit is firmly screwed to the conduit's

adaptor.

Ripple/Noise Parameters Recommended for the Power Supply

The following ripple/noise parameter are recommended for the power supply:

• 100 mV p-p max.

Power Supply Types Recommendations

• Prefer a regulated switching power supply.

• A rectified power supply is not recommended.

• When powering by a battery, avoid the using of switched charger.

Feeding Via PLC

• Verify that the voltage level on the unit’s terminals is at least 15 VDC.

• Check PLC specifications for grounding options.

• It is good practice to add a 150 Ω series resistor between the unit's positive

terminal and the PLC.

Pipe Length

1.64 ft (0.5 m)

Internal Pipe Diameter

≥ 3.0˝ (76.2 mm)

Power Supply

Voltage

15 V

18 V

24 V

28 V

Minimum

Resistance Value

0 Ω

41 Ω

68 Ω

Maximum

Resistance Value

136 Ω

272 Ω

545 Ω

727 Ω

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Chapter 3: Setting Up and Calibrating the Unit

This chapter explains how to set up and calibrate the unit for accurate

measurement monitoring.

The unit is supplied with preprogrammed default settings, making it ready for

immediate operation. There is no need to change the default settings, unless you

wish to calibrate the unit for your specific requirements; however, it is

recommended that you replace the default tank height value with the actual tank

height, as described on page 6. When using the unit, the tank height is calculated

as the distance from the surface of the sensor to the bottom of the tank. You should

enter this value whenever tank height is required. (For flow measurement, enter the

precise flume height.)

The ULF unit contains eleven programs and the ULB unit contains nine programs.

These programs are referred to as functions, which enable you to change the

default settings and calibrate as required. These functions are accessed from a

functions menu. The functions Pr01, Pr02, Pr04 and Pr05 are the most important

to ensure correct usage of your device (with the addition of Pr00 if using the

appropriate ULF series). Function Pr03 may be used if there are interfering signals.

The remaining functions (Pr06, Pr07, Pr08, Pr09 and Pr10) enable you to

customize the unit for your monitoring requirements or to restore factory default

settings.

The diagram below shows the functions available in the functions menus for the

Series ULF and Series ULB. Some functions are only relevant for particular series.

Figure 7: Function Menus

Setting flow measurement parameters (function Pr00) for the Series ULF (Open

Channels) is described in Chapter 4, Open Channels (ULF). Setting parameters

for all other functions and accessing the functions are described in this chapter.

Using Series UL Functions

The LCD display screen, functioning in "normal" mode, provides continuously

updated measurement readings. The display screen is also used to view the

menu options, function settings and data values, accessed by using the function

buttons.

The picture below shows the upper part of the unit.

Figure 8: Display and Function Buttons

The function buttons are used to perform various operations, summarized in the

following table.

NOTE: Within some functions, the digits in the displayed value can be individually

modified. This is indicated by a flashing digit (flashing digits are shown in gray in

the display illustrations. In this case, the ENT and ESC buttons enable you to move

between the digits. Each flashing digit can be modified using the BACK and NEXT

buttons.

Start Up and Function Access:

Button Uses Include:

• Accessing the functions menu (when pressed

simultaneously with )

• Selecting functions

• Progressing to the next step of a function

• Moving from left to right between displayed digits

• Saving changes to data

• Accessing the functions menu (when pressed

simultaneously with )

• Exiting the functions menu to restore the

distance reading

• Moving from right to left between displayed digits

• Exiting a function without saving changes

• Clearing error messages

• Scrolling through the functions menu

• Scrolling through available data values in

functions

• NEXT button only: Recording interfering signals

Press/Action

Connect unit to

power supply

After a brief pause

Display:

For example:

Explanation

Temporary display while

unit takes a reading.

Distance reading.

Enters the functions

menu.

Used to search for the

required menu selection.

Accesses the selected

function.

and

(simultaneously)

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NOTE: If an error message appears, press the ESC button to return to the

main menu.

Values are displayed in feet and inches or meters and centimeters (model

dependent).

Resetting the Unit

The PR01 function enables you to do a reset by refreshing the measurement

reading. (Other saved function settings are not changed.) After resetting, the actual

reading is displayed on the LCD, and the unit begins to scan (same as in turning

the unit on/off).

The reset function may sometimes be required after changing one of the settings

or after receiving an error message.

NOTE: During reset the unit will display 8.8.8.8 followed by 22 mA current output.

To Reset The Unit:

Entering Distance to Empty Level

Use Pr02 function to enter the distance from sensor face to empty level of the tank.

When sensor face coincides with tank top, enter the height of the tank. Default

value is the maximum range for your model. If you enter a value that exceeds this

highest value, an Err error message is displayed and the value is not saved.

NOTE: For flow measurements, enter the precise distance from the sensor to the

bottom of the flume.

Modified to read between 0 and 5 (feet) U.S. Standard Units or between 0 and 1

(meters) metric units (model dependent).

To Enter Tank Height Value:

Defining Interfering Signals

The Pr03 function enables you to locate and store up to six interfering signals (false

echoes) in the unit’s memory to avoid having obstructions, such as a tank agitator

or a sidewall, interfering with the measurement of the contents. Defining interfering

signals is done while the tank is empty.

Figure 9: Scan Distance Process

Each reading (scan distance) taken using the Pr03 function is stored as an

interfering signal, until a reading is achieved that indicates the real echo. If six

interfering signals are already stored, the next read values will not be saved.

NOTE: The reading of the actual target height may not be exact, for example, a

target height of 19.69 ft (6 m) may give a reading in the range 19.62 to 19.75 ft (5.98

to 6.02 m).

The displayed values are in distance units.

To Define Interfering Signals:

NOTE: If the value represents an interference, false echo or false target: press

NEXT. If the value represents the real target, real distance: press ENT.

Press/Action

After a brief pause

Display

For example:

Explanation

Required menu selection.

Temporary display while

unit takes a reading.

Distance reading.

Returns to the functions

menu.

and

(simultaneously)

and

(simultaneously)

Press/Action Display

For example:

Explanation

Required menu selection.

Indicates the measurement unit in feet

or meters (upon request).

Displays last saved tank height or

default value (maximum value in range).

Used to enter a new value.

To save the new value, press when

standing on the far right digit. After YES

is displayed, the display returns to the

functions menu.

To return to the main menu without

saving, press when standing on the

far left digit.

Press/Action

After a brief pause

Display

For example:

Explanation

Required menu selection.

Select Search to locate acoustic

interferences, or Clear to delete stored

interferences.

Displayed after the selection for 3

seconds and then the menu returns to

Pr03.

Temporary display while the unit

searches for interfering signals.

Depth to interfering signal.

Saves the interfering signal, then

searches again and displays the next

reading. Continue to press this button to

save up to six interference readings.

Actual target height reading indicates

that there are no more interfering

signals.

Saves the entered values.

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Configuring 4 mA Current Output

Pr04 function enables you to enter values to be used as the 4 mA mark for remote

monitoring. You can define the 4 mA values for level, distance or flow

measurements (depending on series). The measurement value types should be

defined in Pr04. These definitions will be applicable as well for the 20 mA values

defined in Pr05.

To set 4 mA and 20 mA for level measurements you should configure Pr04 and

Pr05 for level values.

For example, if we measure a tank with tank height configured for 16.4 ft (5.0 m),

the 4 mA values will represent zero tank level and 20 mA values will represent full

tank level. Therefore, the value entered in Pr04 will be 0.0 ft (0.0 m) and the value

entered in Pr05 will be 16.4 ft (5.0 m).

When setting 4 mA and 20 mA for distance measurements, 4 mA values will

represent the minimal distance between the surface of the target and the sensor

and 20 mA values will represent the maximal distance between the sensor and the

surface of the target. Therefore, 4 mA represents the full part of the tank and 20 mA

represents the empty part of the tank.

NOTE: The values for 4 mA and 20 mA must be different, otherwise an Err (error

message) is displayed.

The values for 4 mA and 20 mA should not be greater than the value used for the

tank height (Pr02). Because of the dead-zone, the distance between the sensor

and the surface of the target at its highest level should be a minimum of 0.82 ft

(0.25 m) for ULB Standard-Range and ULF Short-Range models, or 1.96 ft (0.6 m)

for ULB Extended-Range and ULF Standard-Range models.

The first digit of the 4 mA value can be modified to read between 0 and 5 (feet) for

U.S. Standard Units or between 0 and 1 (meters) metric units (upon request).

After accessing the Pr04 function, the unit generates a fixed current of 22 mA on

the 4 to 20 mA line. When the unit reverts to regular scanning mode, the 4 to 20

mA line returns to regular functioning.

The default values for 4 mA and 20 mA in both the ULB and ULF Liquid Series are

level.

The default values for 4 mA and 20 mA in ULF Open Channel Series are flow.

When changing from one measurement mode to another, the measurement units

will be changed automatically (for example, when changing from level mode to flow

mode, the units will change from feet to GPM or meters to M3/H (depending on the

model).

The measurement mode selected for the 4 to 20 mA values will not influence the

measurement mode selected for the display (Pr08). In case of power rest,

measurement configuration (level, distance, flow) will be saved according to the

unit's last configuration.

Configuring 20 mA Current Output

The Pr05 function enables you to enter values to be used as the 20 mA mark for

remote monitoring.

To Enter 20 mA Values:

NOTE: The type of measurement (level, distance or flow) selected in Pr04 is also

applicable for Pr05.

The values for 4 mA and 20 mA must be different; otherwise an Err (error message)

is displayed.

The values for 4 mA and 20 mA should not be higher than the value used for the

tank height (Pr02).

The first digit of the 20 mA value can be modified to read between 0 and 5 for U.S.

Standard Units or between 0 and 1 for metric units (model dependent).

After accessing the Pr05 function, the unit generates a fixed current of 22 mA on

the 4 to 20 mA line. When the unit reverts to regular scanning mode, the 4 to 20

mA line returns to regular functioning.

Please refer to Chapter 5 Troubleshooting for 20 mA error indications.

Press/Action Display

For example:

Explanation

Required menu selection.

Select the format for 4 mA and 20 mA

values to level (L000), distance (d000)

or flow (F000) (depending on model).

Last saved 4 mA level or zero default

value.

Used to enter a new value.

To save the new value, press when

standing on the far right digit. After YES

is displayed, the display returns to the

functions menu.

To return to the main menu without

saving, press when standing on the

far left digit.

Press/Action Display

For example:

Explanation

Required menu selection.

Last saved 20 mA level or default value

(maximum value in range).

Used to enter a new value.

To save the new value, press when

standing on the far right digit. After YES

is displayed, the display returns to the

functions menu.

To return to the main menu without

saving, press when standing on the

far left digit.

Page 7

L-UL:SSS-1000 12/15/10 9:03 AM Page 8

Selecting Low/High Dynamic Speed (ULF Series Only)

The Pr06 function enables you to choose the required speed level. There are two

settings available:

• SE 0: Low dynamic mode (default setting). This mode provides slower readings

with a greater degree of accuracy (rate of up to 31˝/80 cm per min).

• Fail Safe: 10 minutes.

• SE 1: High dynamic mode. This mode provides faster readings but with less

precision (rate of up to 39˝/100 cm per min).

• Fail Safe: 3 minutes.

NOTE: Fail Safe timer determines the waiting period from an echo loss until a

transmission of an error signal.

To Select the Speed Mode:

Defining Working Area

The Pr07 function allows you to add distance range that exceeds the tank's height,

thus enabling accurate readings of complicated tank shapes with conic ending. This

may be required when the vessel has a conical bottom shape, which is causing

false echoes and consequently faulty measurements. The minimal value can be the

entered tank height and the maximal value can be double the value of the entered

tank height. The default setting is the entered tank height.

Figure 10: Defining Working Area

NOTE: It is recommended to use the Pr07 function only in distance mode.

To Define a Working Area:

Selecting Distance or Level Display (for ULB and ULF Liquid Only)

The Pr08 function enables you to choose whether the unit displays either distance

or level measurements. There are two settings available:

• d000: Distance mode (default setting): In this mode, the unit displays the distance

from the sensor to the surface of the contents.

• L000: Level mode: In this mode, the unit displays the level of the contents from

the bottom of the tank.

NOTE: The measurement mode selected for the display will not influence the

measurement mode selected for the 4 to 20 mA values (Pr04). The ULF Open

Channel only displays open channel flow measurement.

To Select Distance or Level Display:

Press/Action Display Explanation

Required menu selection.

Displays the current

operation mode setting.

Used to toggle between

the operations modes.

Saves the selected

operation mode.

Press/Action Display

For example:

Explanation

Required menu selection.

Displayed when entering the function.

Displays the value last saved in the tank

height (default). The entered value

should not be more than double the tank

height and should not exceed the unit's

maximum measuring range.

Used to enter a new value.

Saves the entered value.

Used to move on to the next function.

Press/Action Display Explanation

Required menu selection.

Displays the current

distance/level mode setting.

Used to toggle between the

modes.

Saves the selected mode.

Page 8

L-UL:SSS-1000 12/15/10 9:06 AM Page 9

Entering Factor for Gas Compensation

Function Pr09 enables you to compensate for sound velocity changes in different

types of gasses. You can enter the appropriate factor for each type of gas listed on

the “Gas Factor Table” (Appendix A). For example, the sound velocity in air (at

room temperature) is 1125 ft/sec (343 m/sec) and for Methane (Ch4) 1463 ft/sec

(445.82 m/sec). Therefore, a factor of 1463/1125 = 1.30 should be entered to

compensate for this type of gas. This factor will compensate in cases when the gas

compound consists of 100% Methane. In case the gas is not pure, the sound

velocity cannot be estimated and therefore a minor deviation could appear. It is

recommended to use a reference measurement indicator (using a tape or other

measuring device) and compare the measurement results between the unit and the

reference measurement indicator. If the result is correct, press ENT. If the accuracy

deviation is higher than expected, continue and calibrate the factor to meet the gas

maintained in the vessel. For example, if the gas composition consists of water and

gas you can add ± 0.01 to the factor figure already entered, to meet your

application requirements.

The “Gas Factor Table” supports up to 32 different types of gasses. For any other

type of gas, not included in this table, please contact Dwyer Customer Support,

(www.dwyer-inst.com).

NOTE: Repeat this procedure if the measurement results differ from the actual

material level measured with a reference tape (or other reference measurement

method). Add or reduce 0.01 to calibrate the factor figure already entered.

Updated on-screen results may take a few seconds to appear.

Restoring the Default Settings

The Pr10 function allows clearing all user-defined settings and reverting to the

default factory settings.

Default factory settings are:

Pr00: GPM 1U01 or M³/Hr 1E01

Pr02: Sbd 00.00, E000, Tank Height =default

Pr03: Resets all interfering signals

Pr04: Solid/Liquid device L000, 00.00 or

Flow device F000, 00.00

Pr05: Solid/Liquid device Tank Height = Pr.02

Flow device 55500 M³/Hr or 244400 GPM

Pr06: SE 0 (Liquid and Flow)

Pr07: Tank Height = Pr.02

Pr08: Solid/Liquid device d000

Pr09: 01.00

NOTE: If you decide not to revert to the default settings, press ESC when CLCL is

displayed. A redo option is not available when ENT has been pressed.

To Restore the Default Settings:

Shifting the Blocking Distance

This function enables you to define an area in which measurement results would

be ignored. This option is applicable for installations requiring extension pipes or

nuzzles positioned above the material level. This area should approximately fit the

pipe/nuzzle length to eliminate false echoes and to provide accurate and stable

measurement readings.

• To Shift the Blocking Distance:

Follow the directions given for Entering Distance to Empty Level (Tank Height),

page 6. Instead of entering the tank height value, enter 00.01, and continue as

follows:

NOTE: Shifting of the blocking distance is limited to 4.9 ft (1.5 m). The value

entered to the SBD incorporates the Dead Zone Value.

Pr10 (Clear) reverts the blocking distance to its default.

Echo received from the defined blocking distance area will be ignored by the unit

and the measurement result will be based on the next echo.

When installing via extension pipe, it is recommended to keep approx. 2˝ (5 cm)

gap between the shortest distance to target (maximal level) and the lower pipe

edge. Set the SBD length to a value that is 2˝ (5 cm) smaller than the distance from

the sensor's lower edge to pipe's lower edge, in order to avoid second harmony

interference.

Verifying the Version Number

In addition to the functions described, you can verify the UL series version

number.

• To Verify the Version Number:

Follow the directions given for Entering Distance to Empty Level (Tank Height),

page 6. Instead of entering the tank height value, enter 00.17, and continue as

follows:

Page 9

Press/Action Display

For example:

Explanation

Required menu selection.

Default screen.

Default value.

Choose a factor from the “Gas Factor

Table” (Appendix A).

This is the factor for Ethanol.

Saves the chosen gas factor.

Press/Action Display Explanation

Required menu selection.

Reverts all settings to default factory

settings.

Press/Action Display

For example:

Explanation

Insert this code to enter the blocking

distance area.

This message will flash for a few

seconds, indicating an entry to the

blocking distance area.

Shifts the blocking distance to 2.46 ft

(0.75 m).

Saves this entry and returns to Pr02.

Press/Action

After a brief pause

Display Explanation

Displays the version number.

L-UL:SSS-1000 12/15/10 9:08 AM Page 10

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