Crystal WT Series Manuel utilisateur

C R Y S T A L

engineering corporation

Operation Manual

WTSeries

Digital Pressure Gauge

Contents

Introduction........................................................2

Operating Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Unitsbutton.............................................................4

Zero...................................................................4

Peak detection and Average . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Resetting (clearing) recorded peak values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Automaticshut-off.......................................................5

Backlighting the Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

MeasuringVacuum......................................................6

Water Density (Inches of Water). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Overpressure Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Low battery indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Battery replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Reset..................................................................7

Troubleshooting.....................................................8

Noisy or unstable reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Non-repeatability of pressure measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

DisplayedErrors.........................................................8

Display continuously ashes all segments ...................................9

DigitalInterface.....................................................9

Calibration.........................................................9

WT Series Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Model Numbering System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Specications......................................................11

Accuracy.............................................................11

Temperature...........................................................11

Humidity..............................................................11

Media Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Pressure Conversions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Connection ...........................................................12

Power ................................................................12

Enclosure .............................................................13

Pressure Ranges, Display Scales & Resolution . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Software..........................................................15

LabVIEW™ drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

CongXP Conguration Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Accessories.......................................................15

ACadapterkit.........................................................15

RS-232Cable..........................................................15

Trademarks........................................................15

Warranty..........................................................16

HowtoContactUs:.....................................................16

Page 2 •WT Series

C R Y S T A L

engineering corporation

Introduction

The WTSeries Digital Test Gauge is designed to t in 8” or 10” panel mount applications common-

ly found in portable test sets. The WTSeries is based on the Crystal Engineering Corp. model XP2i

digital pressure gauge (www.xp2i.com). The WTSeries pressure gauge has been repackaged so

that it may be mounted in a portable enclosure, while retaining easy access to batteries and to the

digital (RS-232) interface (both of which would otherwise be on the back of the gauge).

Accuracy is 0.1 percent of reading - so any WTSeries gauge can typically replace several gauges

you may have been using. The gauge is fully temperature compensated - so there is no change

in accuracy throughout the entire operating temperature range! Three AAA batteries provide

up to 500 hours of continuous operation. The batteries are easily replaced by removing the two

screws.

Your WTSeries gauge can be customized, through the use of CongXP software available from

Crystal Engineering. Your personal computer can disable, enable or modify a variety of features of

your WT Series.

Look for the

Con

FIGXP PROGRAMMABLE logo for programmable features that will:

•provide a user-dened pressure scale, and/or disable unused pressure units

•disable keypad recalibration, enable peak button and/or units button

•expand or decrease allowable Zero range

•enable other pressure units (like inches of mercury, kPa, bar, etc.)

•create and enable a user-dened pressure unit

•store a 12 digit ID or tag number in non-volatile memory

•adjust calibration values

We hope the WTSeries gauge meets your expectations, and we're interested in any comments or

suggestions you may have. You can send us a note at: feedback@crystalengineering.net. Many

features in this and our other products are a direct result of your comments!

Crystal Engineering is the company that designs, manufactures, markets and services the XP2i,

30 series pressure calibrators, MultiCal multimeter pressure adapters and a variety of industry spe-

cic pressure measuring equipment. Crystal Engineering pioneered features like full temperature

compensation and “of reading”rated gauges and calibrators. Pressure measuring equipment is the

only thing we do and that’s why we say: PRESSURE is Our BUSINESS™

WT Series •Page 3

C R Y S T A L

engineering corporation

Operating Instructions

The WTSeries gauge is shipped with batteries installed, so it’s ready to use. Press

and hold the (on/off)button. The gauge will rst test all LCD segments. Re-

lease the button when the gauge indicates pressure.

The WTSeries gauge always resumes operation in the mode and the units of the pressure last

used, and it does not automatically rezero when turned on.

WARNING: Severe injury or damage can occur through improper use of pressure instru-

ments! Do not exceed recommended pressure limits of tubing and ttings. Be certain all pres-

sure connections are secured.

CAUTION: Never insert any object into the pressure connection! The sensor diaphragm is

very thin and can be damaged or destroyed by solid or sharp objects. Cleaning of the sensor

must be done with appropriate solvents only.

The WTSeries is intended for gauge pressure measurement. It indicates the dierence between

applied pressure and ambient barometric pressure. However, the

zero

button can be used to

force the WTSeries to read zero pressure at any applied pressure, up to the full scale rating of the

gauge. The factory default setting limits the maximum zero value to 200 PSI, but this limit can be

changed with

Con

FIGXP .

Some WTSeries gauges are rated for absolute pressure. Absolute gauges indicate the dierence

between applied pressure and an internal vacuum reference. Absolute pressure is always positive.

For instance barometric pressure at sea level is on average about 14.7 PSI (approximately 100 kPA

or 1 Bar), so at sea level this is the lowest expected pressure indication. However, absolute gauges

can be “zeroed”(unless prevented by CongXP). After zeroing an absolute gauge it is possible to

indicate a negative pressure.

WARNING: This gauge can display zero pressure when connected to a source of pressure! Do

not rely on the display indication before disconnecting—it may not be indicating true pres-

sure. Never disconnect pressure instrumentation without rst relieving system pressure!

Page 4 •WT Series

C R Y S T A L

engineering corporation

Units button

Pressing this button causes the WTSeries gauge to select the next available unit of

pressure measurement. See “Pressure Ranges, Display Scales & Resolution” for

the list of pressure units available for your model.

Con

FIGXP PROGRAMMABLE Units that you don’t need or never use can be

turned o. You can also dene a special unit for your WTSeries gauge with CongXP. That way

you can use the WTSeries gauge to display directly in a unit not otherwise available, such as feet

of seawater, or foot-pounds of torque. When your custom unit is selected and displayed on the

WTSeries gauge, all pressure unit icons will be o.

Zero

To zero the WTSeries gauge, you must turn o peak indication, then press the

zero button for at least ½ second. The display will then briey ash all dashed

lines (- - - - -), indicating that it has been re-zeroed. If you attempt to zero the gauge

while more than 200 PSI is applied (or the pressure limit set with CongXP), the

command will be ignored, and “- -HI-” will be displayed.

WARNING: This gauge can display zero pressure when connected to a source of pressure! Do

not rely on the display indication before disconnecting—it may not be indicating true pres-

sure. Never disconnect pressure instrumentation without rst relieving system pressure!

You can clear the zero value: Turn o peak indication then press and hold the

zero

button until

the display changes from (- - - - -) to (- - -). This is especially useful for absolute gauges that have

been zeroed while measuring barometric pressure.

Zeroed Clear Zero (Unzero)

Con

FIGXP PROGRAMMABLE You can change the point at which the Zero button will display

“- -HI-”. For instance, you could set the maximum zero to 1 PSI. You can also disable the zero but-

ton entirely, by setting the Zero value to a large negative number.

The

zero

button changes its function when the peak high (

) or the peak low ( LO ) icon is

displayed. While a peak icon is displayed the

zero

button becomes the clear button.

PSI inH2O inHg kpa

mmHg mmH2O mbar kgf/cm2

HI PSI inH2O inHg kpa

mmHg mmH2O mbar kgf/cm2

WT Series •Page 5

C R Y S T A L

engineering corporation

Peak detection and Average

Pressing the Peak button causes the display to cycle through the following:

. . . . . . . . . . Recorded maximum pressure

LO . . . . . . . . . . Minimum recorded pressure

LO . . . . Average pressure*

<No Icon> . . . . Live pressure display

Peak high and low values are not saved when the gauge shuts o; they will reset to the current

reading when the WTSeries gauge is turned on or reset.

* From the factory this Average Pressure is disabled. Use CongXP to enable.

Con

FIGXP PROGRAMMABLE In some cases the ability to display a peak value may not be

needed, or may even be dangerous. CongXP allows you to disable this button.

WTSeries gauges can average 1 to 10 readings, recalculated every time pressure is measured (3

times per second). Enable and set the number of readings to be averaged with CongXP.

Resetting (clearing) recorded peak values

Peak values (if enabled) can only be cleared when displaying either a high or low

recorded pressure. Press the clear button for at least ½ second. Dashed lines

will then briey appear across the display and both

and

icons will ash

briey, indicating that both peak values have been cleared. Both peak high and

low values will then display the current applied pressure. Pressing the clear button while

either peak hi or peak lo icon is displayed will not aect the zero value. If you need to rezero the

gauge, you must turn o both peak icons by pressing the peak button.

Automatic shut-off

The WTSeries gauge has a shuto timer and will turn o automatically after 20 minutes of non-

operation. Pressing any button or sending any command via the RS-232 connection resets the

shuto timer.

The shuto feature can be defeated, if desired, when turning the gauge on. Pressing the

(on/off) and

zero

buttons simultaneously will prevent the WTSeries gauge from automatically

turning o. The gauge will briey display the words“No Auto O” to indicate that it will not turn o.

This procedure is required each time the gauge is turned on, if you want to defeat the auto-shuto.

Page 6 •WT Series

C R Y S T A L

engineering corporation

Backlighting the Display

Pressing the (backlight) button instantly lights the display at maximum brightness,

but to keep it on you need to hold down the button for 2 seconds. The display will ash

briey, indicating that it will stay on for 1 minute. If you press the button again, the

backlight will go into a lower brightness setting to extend battery life, the display will again ash

briey, and remain on for 2 minutes. Press the button once more and the light will go out.

If you start the WTSeries gauge in the “No Auto O” mode, you select the brightness level the

same way, but the light will never time out and turn o; you will have to either turn o the gauge

or press the backlight again until the light goes out.

Measuring Vacuum

All versions of the WTSeries gauge can be used to measure moderate vacuum, though only

ranges of 300 PSI (and 20 bar or 2000 kPa) and lower are actually tested and certied for vacuum

operation.

When measuring pressure less than ambient barometric conditions, a minus (-) sign will appear.

WTSeries gauges are not recommended for continuous use at high vacuum (pressures lower than

-14.5 PSI, at sea level).

Absolute gauges (models with a “B” following the pressure range designation in the part num-

ber) will NOT indicate a negative sign when vacuum is applied, unless the zero button has been

pressed while a pressure greater than full vacuum is applied to the gauge. If your absolute gauge

does indicate a negative pressure, you can clear the zero value (“unzero”) by pressing the zero but-

ton until the display changes from ----- (5 dashes) to - - - (dash, space, dash, space, dash).

See “Zero” for details.

Water Density (Inches of Water)

The following applies only to models where inches of water are available. As shipped from the fac-

tory, the WTSeries gauge is set to display inches of water corresponding to the density of water at

4°C (39.2°F). You may require a dierent water density for your application, so the WTSeries can

be set to use the density of water at 20°C (68°F) or 15.6°C (60°F), instead.

To check and or change the water density setting from the keypad, turn on the WTSeries gauge

by pressing the (on/off) button and the units button simultaneously. The display will indi-

cate either “4C” or “60F” or “68F”.

Press the units button until the display cycles to the desired water density, then press the

zero

button to store the selection (this will not zero the gauge).

Con

FIGXP PROGRAMMABLE Select and set the desired density of water.

WT Series •Page 7

C R Y S T A L

engineering corporation

Overpressure Conditions

The WTSeries gauge will read pressure up to approximately 110% of the rated pressure range.

Above 110% percent of the range the display will start ashing and the readings will not be reli-

able. The zero function does not aect the point at which the display starts ashing to indicate

overpressure, so depending on the zero value it is possible that the display can start ashing with-

out the maximum pressure being displayed.

For instance, if a 100 PSI WTSeries gauge is zeroed when 30 PSI is being applied, it will indicate

that the overpressure condition has been reached at 80 PSI (i.e., 110% x 100 PSI – 30 PSI = 80 PSI).

Overpressure can aect accuracy, but the eect is only temporary unless the sensor has been

destroyed. See Specications for maximum overpressure.

Low battery indication

The battery icon ( ) is the rst indication of a low battery. The WTSeries gauge will continue

to operate accurately while the icon is visible. When the batteries are exhausted, the letters “batt”

will appear across the display. After “batt” appears, no pressure measurements will be possible

until the batteries are replaced.

Battery replacement

The WTSeries gauge uses 3 AAA alka-

line batteries. The batteries are located

above the gauge behind a metal pan-

el. With a small at blade screwdriver,

unscrew the two panel screws to gain

access to the battery compartment.

Remove the battery holder and slide the

cover o. After replacing the batteries,

the gauge will start operating imme-

diately (without having to press the

button). This indicates that a complete

reset has occurred, and is normal.

Reset

If for some reason the WTSeries gauge needs to be reset, remove any battery for at least one

minute, then reinstall the battery. If the reset is successful, the gauge will start operating without

pressing the (on/off) button. Reset will clear the zero, peak values will be reset to the current

reading, and the gauge will be set to the default unit of pressure (PSI).

Page 8 •WT Series

C R Y S T A L

engineering corporation

Troubleshooting

The WTSeries gauge is a very high performance gauge. Due to the high resolution of this prod-

uct, you may observe conditions that appear to be defects in the product, but are in fact a result of

being able to resolve and measure pressure to a degree not possible with other instruments.

Noisy or unstable reading

When calibrating or comparing the indicated pressure from a WTSeries gauge against a hydraulic

deadweight tester or piston gauge, the reading on the WTSeries may appear unstable - the least

signicant digit jumps up and down several counts.

Reason: Gas (usually air) is trapped in the line between the gauge and the deadweight tester.

What is actually happening is the mass is oscillating up and down, and the combination

of gas and uid is acting like a spring. At higher pressures (above 2000 PSI, typically) this

may eventually diminish, as the gas dissolves into the uid.

Solution: Evacuate all tubing with a vacuum pump, before introducing uid into the system.

Non-repeatability of pressure measurements

When checking the gauge against a hydraulic deadweight, increasing pressure measurements do

not match decreasing pressure measurements.

Reason: As in the previous note, gas has dissolved into the hydraulic uid. When decreasing the

pressure, the dissolved gas then leaves the uid, but at an uneven rate, so small pressure

dierential (due to uid head pressure) may exist between the reference deadweight

and the gauge being tested.

Solution: Evacuate all tubing with a vacuum pump, before introducing uid into the system.

Err 1 displayed

Reason: The WTSeries gauge checks the integrity of internal calibration coecients every time

it’s turned on. If any coecients have been corrupted in any way, “Err 1” is displayed.

Solution: Contact factory for instructions on how to restore the memory to the original factory

settings.

Err 2 displayed

Reason: The WTSeries gauge has tried to display a number too large for the display (i.e., more

than 5 digits). May be due to an electrical malfunction or numerical error.

Solution: Contact factory for further instructions.

Err 5 or Err 6 displayed

Reason: The WTSeries pressure sensor is exhibiting out of normal operating condition behavior.

Solution: Contact factory for sensor replacement.

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