Ametek WT Series User manual

WT Series Operation Manual
for the WT Series Digital Test Gauge

Contents
Overview ............................................................. 1
Introduction .......................................................... 1
Operating Instructions ................................................. 2
Functions ............................................................ 3
Enclosure ............................................................ 9
Serial Numbers ........................................................ 9
Specifications ...................................................... 10
Power ................................................................ 11
Pressure Ranges, Display Scales, & Resolution .......................... 12
Part Numbering System ............................................... 12
Support .............................................................. 13
Troubleshooting ...................................................... 13
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Software ............................................................. 15
Replacement Parts .................................................... 15
Accessories ........................................................... 15
Contact Us ........................................................... 16
Factory Service ....................................................... 16
Trademarks .......................................................... 16
Warranty ............................................................. 16

Overview 1
XP2i Operation Manual
Overview

INTRODUCTION
Thank you for choosing the WT Series Digital Test Gauge from Crystal Engineering Corporation. The WT Series is a combination of leading edge technol-
ogy and rugged industrial design. The WT Series Digital Test Gauge is designed to t in 8" or 10" panel mount applications commonly found in portable test
sets. The WT Series is based on the Crystal Engineering Corp. model XP2i digital pressure gauge (www.xp2i.com). The WT Series 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 WT Series can typically replace several gauges you may have been using. The WT Series is fully temperature compen-
sated
– so there is no change in accuracy throughout the entire operating temperature range!
The WT Series’ case is made from rugged aluminum alloy utilizing a gasket to seal the enclosure against dust and water intrusion. Even the RS-232 connector
is fully sealed (with or without the red cover or rubber boot). Circuitry is mounted in shock absorbing elastomer supports and the batteries are easily acces-
sible by removing four screws. But you won’t need to change the batteries often, since 3 AAA batteries provide up to 500 hours of continuous operation. The
batteries are easily replaced by removing the two screws. Other features include:
• Continuous capture of peak and valley pressure readings
• PSV mode
• Programming interface
• User-dened units
• All welded 316 stainless steel sensor
We hope your WT Series meets your expectations, and we're interested in any comments or suggestions you may have. You can send us a note at:
[email protected]. 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 nVision reference pressure recorder, XP2i,and 30 series pressure
calibrators, M1 Pressure Gauge, MultiCal multimeter pressure adapters, and a variety of industry speci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:
™
Your WT Series can be customized, through
the use of our free CongXP™ software. Your
personal computer can disable, enable, or
modify a variety of features of your XP2i. Look
for the logo
for programmable features, like:
• A user dened pressure scale, and/or disable
unused pressure units
• Password protection to prevent
unauthorized changes
• Disable keypad recalibration, (peak)
button, and/or (units)button
• Expand or decrease allowable Zero range
• Set the gauge to a dierent density of water
factor (4° C, 60° F, or 68° F)
• Store a 12 digit ID or tag number in
non-volatile memory
• Adjust calibration values

Overview 2
XP2i Operation Manual

OPERATING INSTRUCTIONS
The WT Series is shipped with batteries installed, so it’s ready to use. Press and hold the (on/o)button. The WT Series will rst test all LCD seg-
ments. Release the (on/o)button when the WT Series indicates pressure.
The WT Series always resumes operation in the mode and the units of the pressure last used, and it does not automatically rezero when turned on.
Connect the WT Series to your system.
! 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.
! WARNING: Severe injury or damage can occur through improper use of pressure instruments! Do not exceed recommended pressure limits of tubing
and ttings. Be certain all pressure connections are secured.
Most WT Series are intended for gauge pressure measurement. That is, they indicate the dierence between applied pressure and ambient barometric pres-
sure. However, the (zero)button can be used to force a WT Series 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 20 PSI, but this limit can be changed with .
Some WT Series are rated for absolute pressure. Absolute gauges indicate the dierence between applied pressure and an internal vacuum reference. Abso-
lute 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 or positive gauge 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 pressure. Never disconnect pressure instrumentation without rst relieving system pressure!

Functions 3
XP2i Operation Manual
Functions
Units Button
Pressing this button causes the WT Series to select the next available unit of pressure measurement.
See Pressure Ranges, Display Scales, & Resolution on page 12 or the list of pressure units available for your model.
Units that you don’t need or never use can be turned o. You can also dene a special unit for your WT Series with CongXP.
You can use the WT Series to display directly in a unit not otherwise available, such as feet of seawater, or foot-pounds of torque. When you select your custom
unit from the keypad, the screen displays the USER icon.
Peak Button
Pressing the (peak)button causes the display to cycle through the following , depending on your setting in CongXP.
<No Icon> . . . . Live Pressure display
. . . . Maximum detected pressure
. . . . Minimum detected pressure
(blinking) . . . . PSV Mode, maximum *
(blinking) . . . . PSV Mode, minimum *
. . . . Average pressure
. . . . DataLoggerXP datalogging mode
*From the factory this setting is disabled. Use CongXP to enable.
Peak High and Peak Low values are not saved when the gauge shuts o; they will reset to the current reading when the WT Series is turned on or reset.
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.
The WT Series can average 1 to 10 readings, recalculated every time pressure is measured (4 times per second). Enable and set the number of readings to be averaged with CongXP.
units
Hi
Lo
peak

Functions 4
XP2i Operation Manual
Resetting (Clearing) Recorded Peak Values
Peak values can only be cleared when displaying either a Peak High or Peak Low recorded pressure. Press the (clear)button for at least ½ second. Dashed
lines will briey appear across the display indicating that both Peak values have been cleared. Both Peak High and Peak Low values will then display the
current applied pressure. Pressing the (clear)button while either the Peak High icon (
HI
) or the Peak Low icon (
LO
) 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.
Zero
If you attempt to zero the gauge while applying a pressure which exceeds the Zero Limit (set in CongXP, defaults to 20 PSI),
the command will be ignored and - - HI - will be displayed.
XTo Zero the WT Series
Turn o peak indication by pressing the (peak)button repeatedly until the Peak High icon (
HI
) and Peak Low icon (
LO
) are o. Then press the (zero)
button for at least ½ second when the gauge is vented to atmosphere.
The display will then briey ash all dashed lines ( ), indicating that it has been re-zeroed. Absolute gauges will now indicate gauge 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 pressure. Never disconnect pressure instrumentation without rst relieving system pressure!
XTo Clear the Zero Value on the WT Series
Turn o peak indication as described above, then press and hold the (zero)button until the display changes from ( ) to ( ).
This is especially useful for absolute gauges that have been zeroed to use for gauge pressure measurement.
clear
zero
clear
zero

Functions 5
XP2i Operation Manual
Automatic Shut-o
The WT Series 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 for another 20 minutes of operation. The WT Series will briey display Auto O 20 when turned on.
To disable the shuto feature, turn on the WT Series by pressing the (on/o)and (zero)buttons simultaneously. The WT Series will briey display the words
No Auto O to indicate that it will not turn o. The shuto feature can be enabled again when turning the WT Series on, by pressing the same (on/o)and
(zero)buttons. These settings are retained when the product is powered down.
Note: This key combination will not toggle the auto-shuto feature if CongXP is set to require a password before changing settings.
Backlight
Pressing the (backlight)button instantly lights the display at maximum brightness. Hold down the button for 1 second to keep it on. The display will ash
briey, indicating that it will stay on for 1 minute. If you press the (backlight)button again, the backlight will go into a lower brightness setting to extend
battery life, and remain on for 2 minutes after the last key is pressed. Press the (backlight)button once more and the light will go out.
If you start the WT Series in the No Auto O mode, you may select the brightness level in the same way. The light will never time out and turn o. Turn o the
WT Series,or press the (backlight)button repeatedly, to turn o the backlight.
Measuring Vacuum
All versions of the WT Series 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.
Absolute gauges (models with a “B” in front of “WT” in the part number) 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)button until the display changes from ( ) to ( ).
! CAUTION: WT Series are not recommended for continuous use below -14.5 PSIG.
For continuous use below -14.5 PSIG with high accuracy, choose our XP2i-DP Dierential Pressure Gauge.

Functions 6
XP2i Operation Manual
Water Density (Inches of Water)
The following applies only to models where inches of water is a selectable pressure unit. As shipped from the factory, the WT Series 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 WT Series 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 WT Series by pressing the (on/o)button and the (peak)button simultane-
ously. The display will indicate either 4C, 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).
Select and set the desired density of water.
Note: If the WT Series is password protected, or inches of water is disabled, you will not be able to view or change the water density from the keypad.
Overpressure Conditions
The WT Series 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 reliable. 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 without the maximum pressure being displayed.
For instance, if a 100 PSI WT Series 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 Pressure Ranges, Display Scales, & Resolution
on page 12 for maximum overpressure.

Functions 7
XP2i Operation Manual
PSVtest Mode
PSVtest mode is designed for PSV and PRV (“Pressure Safety Valve”and “Pressure Relief Valve”, respectively) as well as for Rupture Disc (also known as “Burst
Disc”) testing. It increases the measurement rate of the WT Series gauge to approximately eight times per second, to capture the peak pressure when the
valve opened, and adds a method of automatically capturing the closing reseat pressure.
Use CongXP to activate PSVtest Mode. When the Peak High icon (
HI
) ashes, PSVtest mode is enabled. A special feature of PSVtest is that Peak Low is au-
tomatically reset to the Peak High value whenever a new Peak High value is detected. Once pressure stops increasing, as when a PSV opens (and the pressure
drops below the maximum pressure) WT Series detects the new minimum pressure values (the Peak Low), capturing the closing pressure of a PSV.
Press the (peak)button once to view the captured reseat pressure. The Peak Low icon (
LO
) will ash on the display.
To clear the peaks, press the (clear)button while the display shows the Peak High icon (
HI
) or Peak Low icon (
LO
).
Note: Application note AN-006
– Pressure Safety Valve Testing detailing the operation of the PSVtest mode is available on xp2i.com, and includes examples on
how to use the gauge in relief valve and burst disk testing.
Reset
If for some reason the WT Series needs to be reset, remove any battery for at least one minute, then reinstall the battery. If the reset is successful, the WT Series
will start operating without pressing the (on/o)button. Reset will clear the zero, peak values will be reset to the current reading, and the WT Series will be
set to the default engineering units.
Communications/Programming
The WT Series responds to a query-based command language which allows remote control of the gauge. Please refer to the XP2i Programming Instructions
for documentation of this feature.

Functions 8
XP2i Operation Manual
Low Battery Indication
The Battery icon ( ) uses three bars to display the battery level. When the icon displays all three bars, the batteries are full. The WT Series 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 alkaline batteries. The batteries are located above the gauge behind a metal panel. With a small at blade screwdriver, un-
screw 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 immediately (without having to press the button). This indicates that a complete reset has occurred, and is normal.
! CAUTION: Do not mix battery types or manufacturers.