Crystal DiffXP User Manual

units

peak

zero

C R Y S T A L

Single-

or Dual-line

display

vent

Dual-line

display

(Second line is

DP Measurement)

engineering corporation

Dierential Pressure Test Set User Instructions

Overview

Using Crystal Engineering’s Dierential Test Set based XP2iDD and XP2i gauges, it’s possible to perform pressure dierential measurements. By simply connecting your upstream (+) and downstream (–) pressure lines to the 1/8” FNPT ttings you are ready to go. This test set is capable of displaying live or average dierential pressures (average of 10 samples) depending upon which display mode you select.

Figure 1: General piping interconnect diagram.

Operation

A typical dierential pressure measurement may be done in

the following manner.

i If averaging mode is selected, the lower line will

display the averaged dierential pressure regardless of what display mode the left hand (+) gauge is in.

ii When only the

AVG

icon is lit, the second line display is the averaged non-dierential reading from the gauge and may not be appropriate for your application.

b Left hand (+) or upstream gauge: Using the

button, select live pressure readings (no HI or LO icons), or Average pressure over 10 reading (both HI and

icons).

3 Pressure Connections: Connect upstream (+), down-

stream (–), and their corresponding vent lines to the four 1/8” FNPT connection ports located near the hinge of case. Use pipe thread tape or pipe thread sealant as necessary to ensure a leak free connection.

a Always use a wrench on the test set bulkhead

/8" FNPT tting, as there is a limit to how much rotational force can be applied to the case.

b Due to the robust nature of the Crystal XP2I gauges, full

scale pressure may be applied to either gauge at any time without damage.

4 Zero Gauges: Zero both gauges in the vented condition

by pressing the

button on each gauge. Figure 2 illustrates the appropriate valve states to ensure venting and isolation between both gauges.

1 Select Units: Select your required unit of pressure mea-

surement on each gauge by pressing the

button on each gauge independently. You may select dierent units for each gauge but they must be set individually. The dierential pressure will be displayed on the lower line of the right (–) dual display gauge and will be in the same units as the static pressure.

2 Select Display Options: Select the appropriate display

option on each unit using the

a Right hand (–) or dierential pressure gauge: Using

the

button, select live pressure display (both

and LO icons), or Average pressure over 10 read-

ings (both

, LO, and

be display on the primary line and the dierential pres-

AVG

button:

icons). Static pressure will

sure will be displayed on the secondary or lower line;

Figure 2: Zero gauge valve states.

5 DP Measurement Mode: Change the valves as shown

C R Y S T A L

BUREAUVERITAS

IS0900

ertification

No 191559

in gure 3 to allow line pressure and dierential pressure measurement.

a Dierential Pressure: The lower line of the right

hand (–) gauge is the dierential measurement between both gauges. Place the right hand (–) gauge in averaging mode if further damping is required in the event of erratic or noisy readings.

Specifications

Pressure

Connections: 1/8" female NPT.

System Pressure Limit: Based on lowest pressure rating of

either gauge.

Valving Pressure Limit: 3000 psi maximum.

Accuracy of system using equal pressure range gauges

20% to 100% of Full Scale: ±(0.14% of Static Line Reading).

0% to 20% of Full Scale: ±(0.028% of Full Scale).

Vacuum for 2000 kPa (300 PSI) and lower pressure gauges:

0 to -99.9 kPa (-14.5 PSIG): ±(0.35% of Full Scale),

Where F.S.: -99.9 kPa (-14.5 PSIG).

Batteries

3 each “D” cell. Rotate lid counter-clockwise 90 degrees to remove.

Battery Life

1200 hours typical.

Figure 3: DP measurement mode (pressure gauge isolation).

6 Vent: Vent left-hand (+) gauge as shown in gure 4.

Reverse both upper valves to vent the right hand (–) gauge.

Temperature

Operating and Compensated: -10C to +50C (14F to 122F).

Storage: -40C to +75C (-40F to 167F).

Display Options

Line or Average (over 10 samples).

Display Rate

3 readings/second.

If used in Average mode, 10 sample window is data taken over the last 3.33 seconds.

Display Height:

14.5mm (0.55”) Right hand or (–) dual display dierential gauge.

16.5mm (0.65”) If congured with XP2I gauge (left hand location only).

Media Compatibility:

Liquids and gases compatible with 316 stainless steel.

Enclosure:

Color: Black, watertight, crushproof and dust proof.

IP Rating: IP67.

Figure 4: Vent both gauges.

7 Disconnect Connections: Disconnect connections as

appropriate.

Note: Further detailed information is available in the XP2I-DD

(Dual Display or the unit on the right side). This information can be found at crystalengineering.net

Weight:

6.1 kg (13 lbs 8 oz)

Size:

37.1 cm x 25.8 cm x 15.2 cm

14.6 in x 10.2 in x 6.0 in

PN: 3540—Re v C