Emerson Rosemount Ultrasonic 3107 Bedienungsanleitung

Quick Start Guide

00825-0200-4840, Rev BB

July 2016

Rosemount Ultrasonic

3107 Level and 3108 Flow Transmitters

July 2016

Quick Start Guide

NOTICE

This installation guide provides basic guidelines for the Rosemount 3107 and

Rosemount 3108. It does not provide instructions for detailed configuration, diagnostics,

maintenance, service, troubleshooting, or installations. Refer to the Rosemount 3107 and 3108

Reference Manual for more instructions. Manuals are available electronically on

EmersonProcess/Rosemount.com.

Failure to follow these installation guidelines could result in death or serious injury

The Rosemount 3107 and Rosemount 3108 are ultrasonic transmitters. They must be

installed, connected, commissioned, operated, and maintained by suitably qualified

personnel only, observing any national and local requirements that may apply

Use the equipment only as specified. Failure to do so may impair the protection provided by

the equipment

Explosions could result in death or serious injury

Installation of the transmitters in a hazardous environment must be in accordance with the

appropriate local, national, and international standards, codes, and practices. Please review

the Product Certifications section for any restrictions associated with a safe installation

Before connecting a Field Communicator in an explosive atmosphere, ensure the instruments

are installed in accordance with intrinsically safe or non-incendive field wiring practices

Verify that the operating atmosphere of the transmitter is consistent with the appropriate

hazardous locations certifications

External surface may be hot

Care must be taken to avoid possible burns

Process leaks could result in death or serious injury

Install and tighten process connectors before applying pressure

Do not attempt to loosen or remove process connectors while the transmitter is in service

Electrical shock could cause death or serious injury

Make sure that the transmitter is not powered when making connections

If the liquid level switch is installed in a high voltage environment and a fault condition or

installation error occurs, high voltage may be present on leads and terminals

Quick Start Guide

July 2016

Overview of the Rosemount 3107 and 3108

The Rosemount 3107 and 3108 are sealed 4–20 mA loop-powered liquid level

transmitters, specifically designed for use in waste water and effluent treatment plant

on aqueous applications.

These rugged UPVC transmitters are certified Intrinsically Safe for use in Zone 0 areas,

and factory fitted with up to 165 ft. (50 m) of two-core cable for simple low cost

installation in sumps, wet-wells and over open channel flow structures.

The transmitter may be mounted in a hazardous area if powered from a protected

power supply. They can be connected directly to a plant control system, or used with a

Rosemount 3490 Series Control Unit for programmable control functionality.

Theory of operation

Each transmitter is designed to be mounted above a liquid, and uses ultrasonic pulses

to continuously measure the distance to the liquid surface. The

microprocessor-controlled electronics calculates distance to the liquid level from the

time delay between the transmitting and receiving of signals.

When programmed with the bottom reference of the application – usually the bottom

of a tank – the transmitter will calculate the liquid depth (level), and output the level

(Figure 1) as a 4–20 mA signal and a digital HART®signal.

The 3107 and the 3108 can also calculate contents (volume) or open channel flow, and

then output the result as a 4–20 mA signal and a digital HART signal.

Programming is achieved by remote communication using HART.

Figure 1. Typical application

A. Rosemount 3108 Flow Transmitter E. Pump

B. Rosemount 3490 Series Control Unit F. Transmitter Bottom Reference

C. 4–20 mA signal output G. 4–20 mA and HART signal input

D. Relay

20mA

4mA

July 2016

Quick Start Guide

Components of the transmitter

The transmitter has a housing containing advanced electronics to generate ultrasonic

pulses, process the resultant signals, and provide a 4–20mA and HART output.

There is a factory-fitted cable for the signal output and connecting an external power

supply. The 3108 has a factory-fitted Remote Temperature Sensor.

Figure 2. Transmitter components

A. Mounting bracket D. UPVC wetted parts

B. Two-core cable E. Remote temperature sensor (3108 only)

C. 1-in. mounting thread

Considerations before you install

Install the transmitter where it is protected from ultraviolet radiation to prevent long

term degradation of the plastics used in its construction e.g. shrouded from direct

sunlight.

Note

See also “Product Certifications” on page 21 for special conditions for safe use.

General

Installation must be carried out by suitably trained personnel in accordance with

the applicable code of practice.

If the equipment is likely to come into contact with aggressive substances, it is the

responsibility of the user to take suitable precautions that prevent it from being

adversely affected, thus ensuring that the type of protection is not compromised.

Aggressive Substances are acidic liquids or gases that may attack metals or

solvents that may affect polymeric materials.

Suitable Precautions are regular checks as part of routine inspections, or

establishing, from the material's datasheet, that it is resistant to specific

chemicals.

The equipment should only be cleaned with a damp cloth; do not use solvents.

Quick Start Guide

July 2016

The transmitter is Double Insulated, and therefore Protective Earthing is not

required. However, the cable screen should be connected (see Figure 9 on

page 10).

Note that if the equipment is used in a manner not specified by the manufacturer,

the protection afforded by the equipment may be impaired.

This transmitter is classified Type A in accordance with the European EMC directive

2004/108/EC. To ensure electro-magnetic compatibility, in any member state, it

should not be installed in a residential area.

Note

It is not advisable to mount the transmitter in close proximity to a source of

electrical noise such as a variable-speed drive, or other high-powered electrical

device.

Environmental

The Rosemount 3107 and 3108 ultrasonic transmitters are Intrinsically Safe (IS)

approved for hazardous area installations.

The 3107 is designed for open or closed tank installation. It is weatherproof and

protected against the ingress of dust

The 3108 is designed for open channel flow measurement. It is weatherproof and

protected against the ingress of dust

Avoid installing the 3107 and 3108 near heat sources

Figure 3. Environmental considerations

Installation

Mount the transmitter above the liquid using the 1-in. thread provided, but no

closer than 13.8 in. (0,35 m) to the surface. The transmitter does not detect any

liquid surface closer than 12 in. (0,3 m) to the transmitter face

The transmitter should be mounted vertically to ensure a good echo from the liquid

surface. The beam half angle of the transmitter is 6 degrees (Figure 5 on page 7)

OKOK OK

July 2016

Quick Start Guide

Obstructions in the tank, or well, may generate echoes which can be confused with

the real liquid surface echo. Obstructions within the beam angle generate strong

false echoes. Wherever possible, the transmitter should be positioned to avoid

false echoes.

To avoid detecting unwanted objects in the tank or well, it is advisable to maintain

a distance of at least 1.3 in. from the center line of the transmitter for every foot

(11 cm per meter) range to the obstruction. (See Figure 5 on page 7).

No false echoes are generated if the transmitter is located near the side of the tank

or well and the wall is smooth and free of protrusions. However, there will still be a

reduction in the echo size. It is recommended that the transmitter be mounted no

closer than 12 in. (0,3 m) to the wall to avoid a large reduction in the echo size

If the transmitter is mounted in an enclosed tank with a domed top, avoid

mounting the transmitter in the center of the tank roof because this could act as a

parabolic reflector and create unwanted echoes

Avoid applications where heavy condensation could form on the transmitter face

If the transmitter is mounted in a stand-off or nozzle, the transmitter face should

protrude at least 0.2 in. (5 mm) into the tank

If the transmitter is used in environments where direct sunlight can cause high

surface temperatures on exposed instruments, a sun-shade is recommended

Mounting the transmitter above the liquid surface

A 1 in. thread is provided to mount the transmitter (Figure 4). The thread form is either

BSPP (G1) or NPT, and is marked below the mounting thread.

Mounting bracket

The transmitter is supplied with a purpose made 316 Stainless Steel mounting bracket

(Figure 4) which should be used to mount the transmitter over the liquid surface.

The bracket is designed to fit over the threaded neck of the transmitter and is retained

by a locknut

Use a chain or wire through the hole provided in the bracket, which is shaped to

ensure that the transmitter will hang perpendicular to the liquid surface.

Never suspend the transmitter by the cable. Check that the material of the chain or

wire is corrosion resistant to the liquids and any vapors present.

The bracket may be bolted to a suitable cross member above the liquid surface. Ensure

the transmitter is perpendicular to the surface to maximise the return echo size.

Figure 4. Mounting bracket

A. 1-in. mounting thread

Quick Start Guide

July 2016

Note

To help with alignment, the echo size (signal strength) can be indicated on the

Rosemount 3490 Series Control Unit or a Field Communicator.

Flange mounting

The instrument (accessory) flanges supplied by Emerson are manufactured from PVC

and are a full face design. Care must be taken when installing to a raised face mating

flange on the tank or vessel to prevent distortion of the PVC flange by over-tightening

the bolts. See Product Data Sheet for a list of all accessories and their part numbers.

Figure 5. Flange mounting

A. Transmitter is mounted vertically (maximum deviation of 3°).

B. 6° beam half angle.

C. 1.3 in./ft. (11 cm/m). Minimum of 12 in. (0.3 m).

Mounting from a conduit

The 3107 and the 3108 can be mounted from a conduit using the optional adaptor

accessory. See Product Data Sheet for a list of all accessories and their part numbers.

July 2016

Quick Start Guide

Open channel flow installations

Mount an ultrasonic transmitter over an area of clear liquid. Avoid mounting the

transmitter directly over any inlet stream. Never suspend the transmitter by the cable.

The positioning is critical, and should be the correct distance upstream from the flow

structure as stated in the relevant standard for your country. For example, in the ISO

standards, the distance should be four to five times the maximum height of the water

(Hmax) for a thin plate weir, or three to four times Hmax for a flume. For optimum

accuracy, position the transmitter’s front face at a height equal to the sum of the

maximum flow depth plus the transmitter deadband of 12.2 in. (300 mm) plus an

extra 2 in. (50 mm).

It is important that the bottom reference of the transmitter should be related to the

datum of the primary measuring device (Figure 7).

When setting the bottom reference on a ‘V’- notch weir, it is important the true invert

is used (Figure 8 on page 9) and not the meniscus level.

Figure 6. Choosing the height position above a flow

A. Transmitter front face

B. Hmax

C. Transmitter bottom reference = Hmax + 12.2 in. (300 mm) + 2 in. (50 mm)

Figure 7. Bottom reference of a flume or weir

A. Transmitter bottom reference C. Approach channel

B. Primary element (e.g. flume, weir) invert D. Flow

Quick Start Guide

July 2016

Note

The transmitter should be free from a situation where it is likely to 'drown'

(refer to the relevant standard for further information)

Figure 8. Bottom reference of a ‘V’ notch weir

A. Transmitter bottom reference (i.e. true invert)

B. Meniscus level

The Rosemount 3108 transmitter has a factory fitted remote temperature sensor.

The temperature sensor is enclosed in a M8 x 1.5 threaded stainless steel body, and

can be installed in a suitable plastic conduit box and clamped in place using a suitable

compression type cable gland.

Open weir chamber

Mount the remote temperature sensor so that it is representative of the mean air

temperature in the chamber and is in a shaded area away from direct sunlight and

solar radiation.

Enclosed or partially covered flume chamber

Mount the remote temperature sensor in the approach channel, in a shaded area away

from direct sunlight and solar radiation. The temperature sensor should be positioned

in the weir chamber or flume approach channel so the average air temperature can be

accurately measured. The temperature sensor must be protected at all times from

direct sunlight and any radiated heat.

In extreme high temperatures, for the best accuracy and stability of level

measurement reading, the transmitter should be shrouded to prevent the incidence

of direct sunlight and solar radiation. If the flow structure permits, mount the

transmitter within the flow channel or chamber.

Note

For some installations, the use of a calibration device is mandatory. Emerson offers

the Rosemount Head Verification Device (HVD) for this purpose.

See Quick Installation Guide for more information.

July 2016

Quick Start Guide

Connecting the transmitter

Note

To comply with the CSA requirements, the transmitters must be powered from a

Rosemount 3490 Series Control Unit, or a class 2 or separate extra-low voltage (SELV)

source.

Other devices may reset if connecting the transmitter to a multi-drop system while the

loop is powered. De-energize loop to avoid devices being reset.

The 3107 and 3108 are two-wire, loop-powered transmitters accepting external

power supplies as follows:

12 to 40 Vdc in a non-hazardous area

12 to 30 Vdc in a hazardous area

Each transmitter is supplied with a factory-fitted PVC sheathed, two-core, shielded

cable for communications and external power supply connections. There are no cable

conduit entries and no covers to remove. The cable may be cut to length on site or

may be extended using a junction box and suitable extension cable.

Installation in a non-hazardous area

1. Make sure that the power supply is disconnected.

2. Connect the cable wires (Figure 9), taking note of the required voltage of

12 to 40 Vdc for non-hazardous applications.

Installation in a hazardous area

When used with a Rosemount 3490 Series Control Unit, no additional safety barriers

are required. If powering the transmitter from any other source, ensure a suitable

Intrinsically Safe barrier is fitted in the non-hazardous (safe) area.

To connect the transmitter:

1. Make sure that the power supply is disconnected.

2. Connect the cable wires (Figure 9), taking note of the restricted voltage of

12 to 30 Vdc for hazardous applications.

Figure 9. Wiring

A. Remote Temperature Sensor (3108 Only)

B. Black: 0 Vdc

C. Red: 12 to 40 Vdc (non-hazardous area), 12 to 30 Vdc from protective barrier (hazardous area)

D. Non-hazardous Area: Connect Cable Screen To Standard Ground (Earth) or

Hazardous Area: Connect Cable Screen To I.S. Ground (Earth)

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