TSI Instruments ALNOR MicroManometer AXD 550 Bedienungsanleitung

A TSI Company

OWNER’S MANUAL

AXD 550

MicroManometer®

TABLE OF CONTENTS

General Description 2

Safety 2

Getting Started 3

Installing Batteries 3

Preparing the Instrument 3

Attaching the Optional Pitot probe 3

Attaching a MicroPrinter 4

Start-Up Sequence 4

Zeroing the Instrument 4

Clearing the Memory 4

The Display 4

Modes 4

AXD 550 Keypad and Menus 5

The AXD 550 Keypad 5

Primary Key Functions 5

Secondary Key Functions 6

Menu Selections 6

Menu Items 6

Using the AXD 550 7

Basic Functions 7

To Change Units 7

To Hold a Reading (For Storage or Printing) 7

Measurement Modes 7

Pressure Selection 8

Velocity Selection 8

Volume Selection 8

Data Storage 8

Troubleshooting 9

Maintenance 10

Service Information 11

The AXD 550 MicroManometer is a meter that

measures differential pressure. It is also capable

of measuring and displaying air velocity and

volume flow.

Functions are selected through a 7-key pad or an

RS232 serial port. With the exception of the

ZERO key, each key has dual functions. In

addition, the user can choose from among many

menu-driven items for added measuring

flexibility. Options such as units of measurement

and time-constant settings can also be selected.

The AXD 550 displays measurement results on a

liquid-crystal display (LCD), with additional

display segments for memory locations and units

of measure.

It features two built-in pressure ports for

attachment to the pressure source you will

GENERAL DESCRIPTION

measure. Optional hoses and pitot probes are

available.

The instrument’s memory can hold 100 readings

of pressure, velocity, or volume. For

convenience, memory can be organized into

sections called “pages.” All data is saved by the

instrument’s own battery-powered system.

Readings can also be printed out during

operation by an optional printer, or can be saved

for subsequent downloading. The RS232-C serial

connection attaches the AXD 550 to a printer or

personal computer.

The AXD 550 uses three (3) AA size alkaline

batteries for low replacement cost. The

instrument’s automatic shut-off option can be

used to conserve battery power.

• When using the instrument to check air

flow in an elevated workplace, make certain

that you can safely raise and hold the

instrument while making measurements.

This is especially important when you are

working on a ladder.

• Avoid catching hoses or attachments in

moving machinery.

SAFETY

• Use the instrument only for measurements

using air.

• Avoid any corrosive or other dangerous or

explosive gas mixtures.

Please dispose of used batteries

in a responsible manner.

WARNING

NOTICE

GETTING STARTED

Installing Batteries

The AXD 550 uses three (3) AA size non-

rechargeable batteries. The unit was shipped with

batteries not installed. You will find the batteries

in the instrument package.

unit off after a twenty minute period of keyboard

inactivity. To disable this feature, follow the

instructions in the menu selections section of this

manual.

Attach hoses to the pressure ports at the top of the

instrument. Do not exceed maximum pressure.

If desired, attach the wrist strap to the bottom of

the instrument.

Attaching the Optional Pitot Probe

To attach the probe for measuring air velocity:

• Remove the Pitot probe and rubber tubing

from their carrying case.

• Remove the protective caps from the probe

and save them for re-storing the probe later.

• Attach one section of flexible tubing to the

probe’s static pressure port, and another to

the probe’s total pressure port.

• Identify the (+) and (-) pressure ports at the

top of the AXD 550.

• Attach the tubing from the total pressure

port of the Pitot probe to the (+) port of the

MicroManometer.

• Attach the tubing from the static pressure

port of the Pitot probe to the (-) port of the

MicroManometer.

• Check to ensure that all tubing connections

are tight (see Figure 2).

To install the batteries:

• Loosen the battery cover screw on the rear

of the instrument (Figure 1).

• Slide the cover up and lift it out.

• Install the batteries over the pull strap,

taking care to observe each battery’s

polarity.

• Replace the cover and tighten the screws.

Note: When the batteries become low, the LCD

will show [LO BATT] above the reading. From

that point, you will have about one hour of normal

use left. If []comes on continuously and

replaces the reading, the battery voltage is too

low for accurate measurements and the meter will

turn itself off.

Always keep a replacement set of new batteries

available.

Preparing the Instrument

The unit is shipped with its auto shut-off feature

enabled. This setting will automatically turn the

Figure 1—Back view of instrument

TOTAL PRESSURE HOLE

STATIC PRESSURE HOLES

STATIC PRESSURE PORT

(TO - INPUT ON MANOMETER)

TOTAL PRESSURE PORT

(TO + INPUT ON MANOMETER)

Figure 2—Pitot probe

Attaching a MicroPrinter

Connect the 8521 to the AXD 550 before turning

on the instrument. The connector on the AXD 550

is a telephone-style jack.

To attach the printer:

• Grasp the 8521 integral cable at the

connector.

• Align the keyway.

• Gently push the connector into the AXD 550

until it is locked.

Start-Up Sequence

Each time you turn the instrument on, some basic

functions are tested. The following will occur:

• All the LCD segments will turn on.

• The current software revision level will be

displayed.

• The message [ ] will appear.

• The last unit of measurement will be

displayed.

• The meter will begin to measure.

Zeroing the Instrument

Before you begin taking measurements, the AXD

550 must be zeroed by following these steps:

• Most hand-held meters using differential

pressure sensors require a warm-up time.

Turn on your Alnor AXD 550 a minimum

of 5 minutes before zeroing and taking your

first measurements.

• Make sure there is no air flowing past a Pitot

probe. Also verify that none of the tubing is

pressurized by accidental squeezing.

• Press the ZERO key until [ ] appears

on the display.

The instrument will automatically zero its

readings. Repeat this procedure if necessary,

because at high resolutions the AXD 550 will

read small pressure changes.

Clearing the Memory

If this is the first time you are using the AXD 550,

clear the memory before using the instrument.

Clearing the memory is done with the following steps:

• Push CLR for three seconds.

• Push ↑until [ ] appears.

• Push ↵to clear memory.

The meter starts in RUN mode. It will display

measurement values associated with the unit last

used. If the value is OVERRANGE the display

will show [ ]; similarily if the instrument is

measuring an UNDERRANGE value the display

will show [ ].

The AXD 550 uses a 4-digit, 7-segment LCD.

As a result, measurements exceeding 9,999 of

a given unit of measure will be displayed in a

scientific notation format of XXEY. The actual

reading will be rounded to the nearest thousand,

XX. The Y indicates the number of zeros after

XX. For example, 12,751 is displayed as [ ].

The AXD 550 is measuring and averaging the

actual value of the reading, not the rounded

THE DISPLAY

scientific notation value. No accuracy loss will

be encountered. When printing the data on the

8521 MicroPrinter or downloading the data to a

host PC, the actual reading will be seen.

Modes

The AXD 550 operates and takes measurements

in the RUN mode. You may be in the RUN mode

or one of the menu selection modes.

VOL The VOL key prepares the AXD 550

for air volume measurements. After

pressing this key, you must indicate

whether you’re measuring by area, or

whether you’re measuring a round or

rectangular duct. Choose one of these

options by pressing the ↑or ↓key,

followed by the ↵key to make a

selection. After you make your

selection, use the ↑or ↓key to enter

the dimensions, then the ↵key to enter

the units.

MENU MENU allows you to select one of

several options. Use the ↑or ↓keys to

move through the choices. To choose a

selection, push ↵, or return to RUN

mode by pushing ON/OFF. The

MENU selections are as follows:

[] Changes memory page

[] Prints all stored data

[] Correction Factor

[] Enables or disables auto

shut-off

[] Scans meter voltages

[] This is only used by the

factory

[ ] Enables or disables the

serial port

[] Time constant selection

(See also Menu Selections, next page)

HOLD Pressing this key freezes data in RUN

mode for input to memory or output to

a printer. The display flashes. Pushing

HOLD again stores and prints your

data. Pressing ON/OFF returns you to

RUN mode without storing or printing.

UNIT The UNIT key allows you to select a

unit of measurement. The ↑and ↓keys

move through the choices. Use the ↵

key to accept a choice, or press ON/

OFF to return to RUN mode without

making changes.

AXD 550 KEYPAD AND MENUS

↵

OFF

VOL

CLR

↑

HOLD

AVE

UNIT MEM

↓

ZERO

AXD550

MICROMANOMETER

WARNING

CAUTION

OFF

VOL

CLR

↑

HOLD

AVE

UNIT

↵

The AXD 550 Keypad

Each key (except ZERO) has two different

functions. The primary function is shown above

the diagonal line on the key’s surface. The

secondary function is shown below the diagonal

line. A more detailed description of each

function follows.

In the RUN mode,

if a key is held for

less than three

seconds, the

primary function is

activated. When a

key is held for

more than three

seconds, the

secondary function

is activated. The

exceptions to this

are the ↑and ↓

keys. Because they

are used to move

between menu options, these keys do not

function in RUN mode.

The cycle time of the AXD

550 software may cause

the meter to react slowly to a key push. The

reaction time of a key push will vary with

different functions (1–3 seconds). Do not push

a key twice because of a slow response time.

Doing so may result in accidental activation

of a secondary function or duplication of a

desired function.

Primary Key Functions:

ON/OFF This key is used to turn the instrument

on or off when in the RUN mode. If

the instrument is in any other mode,

pressing this key will exit that function

and go back to the RUN mode without

making any changes.

Menu items (to select any of the following

press ↵):

Measurements stored in the instrument’s

memory are organized into pages. This

key changes the page onto which you

are saving your measurements. If there

is no stored data on the current page,

the page number will not increase. A

total of 100 sets, or lines, of data can be

stored. You may have 100 pages of one

line each, one page of 100 lines each, or

any combination of pages and lines not

exceeding 100 readings.

This copies all stored data to a

connected printer or computer. You

can abort the printout at any time by

pressing and holding the ON/OFF key.

The Correction Factor is an all-purpose

multiplying factor which is applied

when measuring velocities or volumes.

cF is set to 1.000 unless it is changed in

the menu. An annunciator (t) tells the

user when “cF=1.” cF is usually used

when air density conditions deviate

from standard. See Appendix E.

Select values with the ↑or ↓key, then

press ↵to accept them or ON/OFF to

reject them.

This automatic shut-off option can be

enabled or disabled by pushing ↑or ↓

to select [ ] or [ ], then pushing

the ↵key to enter your selection.

When enabled, the automatic shut-off

will power-down the AXD 550 after

twenty minutes of keyboard inactivity.

This diagnostic tool allows a user to

view important analog voltages within

the instrument. Pushing ↑or ↓views

the eight different channels, which

include the following:

— O V dc.

— 4.965 to 5.025 V dc.

— battery voltage (3.5 V fresh

batteries)

MEM

↓

HOLD

AVE

UNIT

↵

ZERO

↑

MEM

↓

MEM The MEMORY key is used to review

stored data. When it is pressed, the

display will show the current page

number. The ↑and ↓keys will move

you to any page you wish to review.

To examine data, press the ↵key.

If memory is empty, the unit

automatically jumps back to RUN

mode. Otherwise, you can return there

by pressing the ON/OFF key.

(See also PAGES in Data Storage)

ZERO The AXD 550 will zero the instrument

any time this key is pushed. To get a

proper zero, make sure no pressure

difference is applied across the ports

and no kinks are in the hoses.

(See also Zeroing the Instrument)

Secondary Key Functions:

↑and ↓These keys allow you to move or scroll

through menu selections in forward (↑)

or reverse (↓) order.

AVE If held for 3 seconds, the AVE key lets

you view the average of the current

page of measurements which has been

stored. Pushing ON/OFF returns you to

RUN mode.

↵This key accepts all selected choices

such as values and menu items. After

each entry, [ ] appears on the

display as the AXD 550 stores new

information.

Menu Selections

Pressing the MENU key activates the main menu.

Use the ↑and ↓keys to scroll through the

available selections. Once you find your desired

selection, choose it by pressing ↵. Pressing ON/

OFF exits the menu, returning you to RUN mode.

Factory use only.

Selecting this item allows the user to

enable (on) or disable (off) the serial

port.

• Press the ↵key.

• Using the ↑or the ↓key, scroll to

or .

• Press the ↵key.

• Press the ON/OFF key to return to

the RUN mode.

Note: the serial port must be when

interfacing to a computer. Keep the port

when not in use to conserve batteries.

USING THE AXD 550

tc allows you to select from five

different speeds of display response.

• A setting of 1 is a quick response.

• A setting of 5 is a slow response.

• The meter is always shipped with

tc=2.

See the Time Constant Averaging

section in Appendix B for the exact

method the AXD 550 uses to display

a series of measurements.

Basic Functions

To Change Units:

• Push the UNIT key until [ ] appears.

• Use the ↑and ↓keys to view new

measurement units.

• The display annunciator ▲will move to the

selected unit (see Figure 3).

• Push ↵to select a new measurement unit.

km/h

m/s

mph

fps

fpm

mmH

inH

l/s

cfm

Figure 3—Display with annunciator and units of

measure.

For example: To change the units of measurement

from feet per minute (fpm) to meters per second

(m/s):

• Push the UNIT key until [ ] appears.

• Push ↑until the display annunciator ▲

moves to m/s, selecting meters per second.

• Push ↵to select the measurement unit.

To Hold a Reading (For storage or

printing):

• Push the HOLD key briefly until the

measured value flashes.

• Push HOLD again to STORE this reading

to memory, or push ON/OFF to reject it

and return to RUN mode.

Measurement Modes

You can set the AXD 550 for pressure,

velocity, or volume measurement by pressing

the UNIT key.

Pressure Selection:

The AXD 550 is a pressure measuring instrument.

Its factory default setting is to measure pressure in

inches of water (in. H2O) or pascals (Pa).

Velocity Selection:

Air velocity measurement can be accomplished

using a Pitot probe.

The following equations are used for pressure to

velocity conversions:

Pressure in inches H2O Velocity = 4005

÷∆P (inches H2O) in

feet/min

Pressure in Pascals Velocity = 1.29 ÷∆P

(Pa) in meters/second

The velocity calculations assume standard

conditions. Use the cF menu option to adjust the

velocity or volume readings. (See Appendix E

for air density correction factors and Appendix D

for pressure to velocity conversion charts.)

Volume Selection

(or reviewing the latest area):

Air volume measurement is achieved by

multiplying a velocity reading by an area.

• When you press the VOL key, the [ ]

menu appears on the display and provides a

way to choose whether you are measuring

by area (in square units) or by a round or

rectangular cross-section.

• Make your selection by scrolling using the

↑and ↓keys, then pressing the ↵key to

accept your choice.

• If you choose to use a cross-section, you

must then indicate dimensions as follows.

Area (review or select new value):

• When selected, [ ] flashes the current

units ft2[ ] or m2[ ].

• The display will then show the last area

value selected in ft2or m2.

• Modify these values by using the ↑and ↓

keys to change the volume, pressing the ↵

key to accept the value.

Rectangular:

• After [ ] is selected, the units of linear

distance will be flashed briefly in inches or

meters.

• The display will then show starting X

dimension values [ ] in inches or [ ]

meters. Accepting the X value affects choice

of a volume dimension (e.g. cfm).

• Change these values using ↑or ↓. Press the

↵key to accept.

• The next display shows desired Y dimension

values of [ ] in inches or [ ] meters.

• Change these values using ↑or ↓. Press the

↵key to accept.

• Press the ↑or ↓key until the desired value

is reached, then press ↵to accept.

Round:

• The display will show starting point diameter

values [ ] in inches or [ ] meters.

• Change the value to the necessary diameter

using ↑or ↓. Press the ↵key to accept.

Data Storage

All measurements stored in the instrument’s

memory are recorded on pages. A page is created

whenever:

• the unit of measurement changes,

• or page is selected from the MENU.

For example, if you are measuring feet per

second and decide to take measurements in miles

per hour, a new page will be created.

The AXD 550 memory has a total capacity of

100 sets of data. This means you can have one

page of 100 lines, or one hundred pages of one

line, or any combination of pages and lines

totaling 100 readings.

Each time the HOLD key is pressed for the

“second” time, the instrument will store

measurements and the correction factor. Readings

are stored in battery-backed memory so that

powering off or changing batteries does not erase

readings. These stored readings will remain in

memory until they are cleared or if the instrument

is damaged or malfunctions.

A copy of this data can be obtained if a printer or

computer is attached to the instrument.

If a printer is connected:

• Press the MENU key, then the ↑or ↓key

until [ ] appears.

• Press ↵to print the data.

• To escape from the print routine, press and

hold the ON/OFF key until [ ]

appears, then press the ON/OFF key to

return to the RUN mode.

To erase stored data:

• Press the CLR key until [ ] appears.

• Push the ↑or ↓key until [ ] appears.

• Press ↵to clear the memory.

Note: Keep in mind that you cannot erase

individual pages. Clearing data erases every

page in the instrument’s memory.

TROUBLESHOOTING

Symptom Probable Cause/Corrective Action

Display shows [ ] The measured value is beyond the instrument’s

range. Be sure there is no applied pressure, then

press ZERO.

Display shows [ ] Connection between the meter and the sensor is

faulty. Turn the meter off, then turn it back on

again.

Display does not change Your meter could be in a mode other than RUN.

Press the ON/OFF key until the unit turns off.

Then turn it on and try again.

Your input might simply be very stable. Test

your meter by pinching the hoses.

Meter turns off after completing start-up cycle The batteries are too low for your meter start.

Watch for the [ ] indication just before the

meter turns off, then replace the batteries.

Meter turns off by itself Check the auto shut-off feature. Your batteries

are probably too low; replace them. If after 20

minutes your meter turns off again, disable the

auto shut-off feature.

Meter does not turn off Be sure your meter is in RUN mode, since it

must be in RUN mode to turn off.

Continued on next page

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