Crystal XP2i 2nd Generation User Manual

Operation Manual

for XP2i Digital Test Gauge (Standard and Dual-Display(DD))

Contents

Overview ................................................................ 1

Introduction .............................................................1

Operating Instructions .................................................... 2

Functions ............................................................... 3

Enclosure ...............................................................10

XP2i Serial Numbers .....................................................11

Speciﬁcations ......................................................... 12

Power ...................................................................14

Pressure Ranges, Display Scales, & Resolution .............................15

Model Numbering System ...............................................15

Safety & Certiﬁcations .............................................16

Hazardous Locations .....................................................16

Certiﬁcations ............................................................16

ATEX/IECEx Safety Instructions ...........................................19

Support .................................................................24

Troubleshooting .........................................................24

Calibration ..............................................................25

Software ................................................................26

Replacement Parts ....................................................... 26

Accessories ..............................................................26

Trademarks .............................................................27

Warranty ................................................................27

Overview

INTRODUCTION



Thank you for choosing the XP2i Digital Test Gauge from Crystal Engineering Corporation. Your XP2i is a combination of leading edge technology and

rugged industrial design.

Accuracy is 0.1 percent of reading - so any XP2i can typically replace several gauges you may have been using. The XP2i is fully temperature compensated - so

there is no change in accuracy throughout the entire operating temperature range!

The XP2i’s 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 cover). Circuitry is mounted in shock absorbing elastomer supports and the batteries are easily accessible by removing four

screws. But you won’t need to change the batteries often, since 3 AA batteries operate the XP2i for up to 1500 hours of continuous use. Other features include:

Continuous recording of peak and valley pressure readings

•

A removable ﬁlter (to keep out large particle contaminants)

•

All welded 316 stainless steel sensor

•

Overview  1

We hope your XP2i meets your expectations, and we're interested in any comments or suggestions you may have. You can send us a note at:

sales@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 nVision reference pressure recorder, XP2i, and 30 series pres

sure calibrators, MultiCal multimeter pressure adapters, and a variety of industry speciﬁc 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 XP2i 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 deﬁned 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 diﬀerent 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

•

XP2i Operation Manual

OPERATING INSTRUCTIONS



The XP2i is shipped with batteries installed, so it’s ready to use. Press and hold the (on/o) button. The XP2i will ﬁrst test all LCD segments. Release

(on/o) button when the XP2i indicates pressure.

the

The XP2i 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 XP2i to your system. Always use a wrench (¾″ or 19mm) for installation and removal of XP2i! There is a limit to how much rotational force can be

applied to the case, so don’t rely on, or use, the case to screw the XP2i into a tting, and don’t use the case to remove the XP2i tting, either.

WARNING: Severe injury or damage can occur through improper use of pressure instruments! Do not exceed recommended pressure limits of tubing

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

Most XP2is are intended for gauge pressure measurement. That is, they indicate the diﬀerence between applied pressure and ambient barometric pressure.

However, the

default setting limits the maximum zero value to 200 PSI, but this limit can be changed with

Some XP2is are rated for absolute pressure. Absolute gauges indicate the diﬀerence 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 ConﬁgXP). After zeroing an absolute gauge it is

possible to indicate a negative pressure.

and ttings. Be certain all pressure connections are secured.

objects. Cleaning of the sensor must be done with appropriate solvents only.

(zero) button can be used to force an XP2i to read zero pressure at any applied pressure, up to the full scale rating of the gauge. The factory

Overview  2

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!

XP2i Operation Manual

Functions

PSIinH2OinHgkpa

Units Button

Pressing this button causes the XP2i 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.

Units that you don’t need or never use can be turned oﬀ. You can also deﬁne a special unit for your XP2i with ConﬁgXP. You

can use the XP2i 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 XP2i, all pressure unit icons will be oﬀ.

Zero

To zero the XP2i you must turn o peak indication, then press the (zero) button for at least ½ second. To zero a dual-line display XP2i you must turn o display of

peak or TARE values (press the peak button until second line is blank, or displaying average or rate), then press the

The display will then brieﬂy ﬂash 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 ConﬁgXP), 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 pressure. Never disconnect pressure instrumentation without rst relieving system pressure!

(zero) button for at least ½ second.

Functions  3

To clear the Zero Value on an XP2i turn oﬀ peak indication then press and hold the

(zero) button until the display changes from (- - - - -) to (- - -).

To clear the Zero Value on a dual-line XP2i turn oﬀ display of peak or TARE values (press the peak button until second line is blank, or displaying average or

rate), 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.

mmHgmmH2Ombarkgf/cm

Zeroed Clear Zero (Unzero)

mmHgmmH2Ombarkgf/cm

You can change the point at which the Zero button will display “- -HI-”. For instance, you could set the maximum zero to 3000

PSI, if you need to mix high pressure gases. You can also disable the zero button entirely, by setting the Zero value to a large negative number.

On an XP2i the

(zero) button changes its function when the peak high (

) or the peak low (

) icon is displayed. While a peak icon is displayed the

(zero) button becomes the (clear) button.

On a dual-line XP2i the

(zero) button changes its function depending on what is being displayed on the second line.

XP2i Operation Manual

Functions  4

(

Tare

-DD, Dual-Line Display XP2i Only

)

Tare is a constant value subtracted from the true pressure. For instance, if you were mixing gases by partial pressure, you might want to ﬁll a tank to 1760 PSI

with air, then add another 440 PSI of helium. To reduce the chance of error, you could tare the gauge at 1760 PSI. Then you would add helium until the indica

tion reached 440.

PSI

TARE

Fill to pressure Press the Tare button Top-oﬀ with helium

TARE

PSI

TARE

PSI

To use the tare feature, press the Peak button until TARE is displayed. Apply pressure to the gauge until the desired tare value is reached. Press the zero but-

ton. The top line will change from true pressure to the tared pressure. The amount of the tare will be displayed on the second line.

The tare function is disabled by default, but can be enabled with ConﬁgXP.

Tare is in eﬀect only when the tare icon is on.

(

Rate

-DD, Dual-Line Display XP2i Only

Rate is the measurement of pressure change per minute. When in rate mode, the second line will display the rate, and the

)

, AVG, and TARE icons will

not be lit. Rate is calculated every pressure measurement (3 times per second), and the displayed value is the average of the most recent 3 to 10 calculations.

By increasing the number of calculations in the average, the XP2i will indicate a more stable rate. However, the XP2i will react more slowly to changes in rate.

To use the rate feature, press the Peak button until no icons are lit but the second line is displaying a value. As pressure changes, the second line will indicate

rate of change.

The rate function is disabled by default, but can be enabled and conﬁgured with ConﬁgXP. The number of calculations can also

be set with the digital interface.

XP2i Operation Manual

Peak Detection and Average

Functions  5

On the XP2i, pressing the Peak button causes the display to cycle through the following:

. . . . . . . . . . . . . . . . Maximum recorded pressure

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

. . . . . . . . . . . . . . . . Average pressure*

<No Icon> . . . . . . . . . . . . . . . . Live pressure display

* From the factory this Average Pressure is disabled. Use ConﬁgXP to enable.

On the -DD, dual-line XP2i, pressing the Peak button causes the display to cycle through the following:

. . . . . . . . . . . . . . . . Maximum recorded pressure

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

AVG . . . . . . . . . . . . . . . . Average pressure

TARE . . . . . . . . . . . . . . . . Tare

<No Icon> . . . . . . . . . . . . . . . . Rate of change

<No Icon> . . . . . . . . . . . . . . . . Oﬀ

Peak high and low values are not saved when the gauge shuts oﬀ; they will reset to the current reading when the XP2i is turned on or reset.

In some cases the ability to display a peak value may not be needed, or may even be dangerous. ConﬁgXP allows you to dis

able this button.

XP2is 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 ConﬁgXP.

Dierential Mode

(

-DD, Dual-Line Display XP2i Only

)

Diﬀerential mode allows the XP2i-DD gauge (the master) to be connected to a second XP2i or XP2i-DD gauge (the slave) and display the pressure diﬀerence

between the two gauges. A standard RS232 cable (p/n 2400) and null modem adapter (p/n 3456) or a NULL modem cable are required to directly connect the

gauges. You must use ConﬁgXP to enable this feature, and once enabled, use the PEAK button on the master gauge until the

and

icons are displayed

simultaneously. An XP2i-DD gauge must be running ﬁrmware version R0114 or later, and an XP2i gauge must be running ﬁrmware version R0014 or later for

this feature to work. Use XP2iUpdate (available on the Crystal Engineering web site) to upgrade to the latest ﬁrmware.

The diﬀerential mode is disabled by default, but can be enabled and conﬁgured with ConﬁgXP.

Resetting (Clearing) Recorded Peak Values

Peak values 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

brieﬂy appear across the display indicating that both peak values have been cleared. Both peak high and low values will then display the current applied pres sure. Pressing the (clear) button while either peak hi or peak lo icon is displayed will not aﬀect the zero value. If you need to rezero the gauge, you must turn

oﬀ both peak icons by pressing the

(peak) button.

XP2i Operation Manual

Automatic Shut-o

The XP2i has a shutoﬀ timer and will turn oﬀ automatically after 20 minutes of non-operation. Pressing any button or sending any command via the RS-232

connection resets the shutoﬀ timer for another 20 minutes of operation.

Functions  6

The shutoﬀ feature can be disabled if desired. Turning on the XP2i by pressing the

tomatically turning oﬀ. The XP2i will brieﬂy display the words “No Auto O” to indicate that it will not turn oﬀ. The shutoﬀ feature can be toggled or enabled

again when turning the XP2i on. When the XP2i is powered down, pressing the same

functionality. The XP2i will brieﬂy display the words “Auto O 20” to indicate that will turn oﬀ after 20 minutes of inactivity. These settings are retained when

the product is powered down.

(on/o) and (zero) buttons simultaneously will prevent the XP2i from au-

(on/o) and (zero) buttons turns on the XP2i and returns it to auto oﬀ

Backlight

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 ﬂash brieﬂy, indicating that it will stay on for 1 minute. If you press the ting to extend battery life, the display will again ﬂash brieﬂy, and remain on for 2 minutes. Press the (backlight) button once more and the light will go out.

If you start the XP2i in the “No Auto Oﬀ” mode, you select the brightness level the same way, but the light will never time out and turn oﬀ; you will have to

either turn oﬀ the XP2i or press the

(backlight) button again until the light goes out.

(backlight) button again, the backlight will go into a lower brightness set-

Measuring Vacuum

All versions of the XP2i 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

certiﬁed 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 “XP2i” 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 (- - -). See “Zero” for details.

CAUTION: XP2is are not recommended for continuous use at high vacuum.

For continuous use at high vacuum with high accuracy, choose our XP2i-DP Diﬀerential Pressure Gauge. For product details, refer to our web site at www.crystalengineering.net.

XP2i Operation Manual

Water Density (Inches of Water)

The following applies only to models where inch of water is a selectable pressure unit. As shipped from the factory, the XP2i is set to display inches of water

corresponding to the density of water at 4°C (39.2°F). You may require a diﬀerent water density for your application, so the XP2i can be set to use the density

of water at 20°C (68°F) or 15.6°C (60°F), instead.

Functions  7

To check and/or change the water density setting from the keypad, turn on the XP2i by pressing the

The display will indicate either “4C” , “60F”, or “68F”.

Press the

water density from the keypad.

(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. If the XP2i is password protected, you will not be able to view or change the

(on/o) button and the (units) button simultaneously.

Overpressure Conditions

The XP2i will read pressure up to approximately 110% of the rated pressure range. Above 110% percent of the range the display will start ﬂashing 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 ﬂashing without the maximum pressure being displayed.

For instance, if a 100PSIXP2i 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 aﬀect accuracy, but the eﬀect is only temporary unless the sensor has been destroyed. See Specications for maximum overpressure.

Low Battery Indication

The battery icon ( ) is the ﬁrst indication of a low battery. The XP2i 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 XP2i uses 3 AA batteries. Unscrew the four rear panel screws to gain access to the battery compartment. After replacing the batteries, the XP2i will start operat-

ing immediately (without having to press the

WARNING: Do not remove or change the batteries in hazardous locations.

Note: The XP2i is Intrinsically Safe only if powered by one of the following battery types: Rayovac Maximum Plus, Energizer® E91, Energizer® EN91,

or Duracell MN1500.

(on/o) b

utton). This indicates that a complete reset has occurred, and is normal.

XP2i Operation Manual

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