Ashcroft GC31 User Manual

Installation and Maintenance
Instructions for GC31
Ultra-Compact Digital
Pressure Sensor

Ashcroft Inc. 250 East Main Street, Stratford, CT 06614 USA
Tel: [phone], Fax: [phone] www.ashcroft.com
All sales subject to standard terms and conditions of sale.
© 2009 I&M011-10170 -01/10

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Version 5.0 10/07

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CONTENTS

CAUTION ........................................................................................................................ 4

1. SPECIFICATIONS ............................………………………………………………………. 5

2. DIMENSION DRAWINGS ............................……………………………………………….. 6

3. INSTALLATION............................………………………………………………………….. 6

4. WIRING ..............................………………………………………………………………. 7-8

5. NOISE PREVENTION............................……………………………………………………. 9

6. STORAGE ............................………………………………………………………………. 9

7. MAINTENANCE ............................…………………………………………………………. 9

8. MENU NAVIGATION............................…………………………………………………….. 9-10

9. FUNCTION SETTING MODE ........................……………………………………………….. 10-12

10. SWITCH SETTING MODE ..........................………………………………………………… 12-13

11. SWITCH OPERATION ............................……………………………………………………. 14-15

12. OTHER FUNCTIONS ..........................……………………………………………………… 15

13. ERROR DISPLAY ..........................................……………………………………………. 16

14. MAINTENANCE & WARRANTY ..........................……………………………………………. 17

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WARNING! READ

BEFORE INSTALLATION

1. GENERAL:

A failure resulting in injury or damage may be caused by excessive overpressure, exces­sive vibration or pressure pulsation, excessive instrument temperature, corrosion of the
pressure containing parts, or other misuse. Consult Ashcroft Inc., Stratford, Connecticut,
USA before installing if there are any questions or concerns.

2. OVERPRESSURE:

Pressure spikes in excess of the rated overpressure capability of the transducer may cause
irreversible electrical and/or mechanical damage to the pressure measuring and containing
elements.
Fluid hammer and surges can destroy any pressure transducer and must always be avoided. A
pressure snubber should be installed to eliminate the damaging hammer effects. Fluid hammer
occurs when a liquid flow is suddenly stopped, as with quick closing solenoid valves. Surges
occur when flow is suddenly begun, as when a pump is turned on at full power or a valve is
quickly opened.

Liquid surges are particularly damaging to pressure transducers if the pipe is originally empty.
To avoid damaging surges, fluid lines should remain full (if possible), pumps should be brought
up to power slowly, and valves opened slowly.To avoid damage from both fluid hammer and
surges, a surge chamber should be installed.

Symptoms of fluid hammer and surge's damaging effects:

• Pressure transducer exhibits an output at zero pressure (large zero offset).

• Pressure transducer output remains constant regardless of pressure

• In severe cases, there will be no output.

FREEZING:

Prohibit freezing of media in pressure port. Unit should be drained (mount in vertical position
with electrical termination upward) to prevent possible overpressure damage from frozen
media.

3. STATIC ELECTRICAL CHARGES:

Any electrical device may be susceptible to damage when exposed to static electrical charges.
To avoid damage to the transducer observe the following:

• Ground the body of the transducer BEFORE making any electrical connections.

• When disconnecting, remove the ground LAST!

Note: The shield and drain wire in the cable (if supplied) is not connected to the transducer body,
and is not a suitable ground.

4. USE IN LIFE SUPPORT DEVICES

Ashcroft Inc. products are not authorized for use as critical components in life support devices or
systems without the express written approval of the General Manager, Stratford Operations of
Ashcroft Inc.

1. Life support devices or systems are devices or systems which, (a) are intended for surgical
implant into the body, or (b) support or sustain life, and whose failure to perform, when properly
used in accordance with instructions for use provided in the labeling, can be reasonably
expected to result in a significant injury to the user.

2. A critical component is any component of a life support device or system whose failure to per­form can be reasonably expected to cause the failure of the life support device or system, or to
affect its safety or effectiveness.

As used herein:

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1. SPECIFICATIONS:

PERFORMANCE SPECIFICATIONS
Analog Output (1–5Vdc):

Accuracy: ±1.0% FS (Accuracy includes the effects of Linearity, Hysteresis and Repeatability)
Response Time: 50msec
Output Resolution: 25mV
Analog Scaling: User may configure analog output scaling to any range within Full Scale

of sensor range

Pressure Switch Output:

Type: NPN or PNP Open Collector up to 30Vdc/80mA
Setting Accuracy: ±1.0% FS
Number of Contacts: 2
Response Time: 5msec-2.0 sec (by user)
Hysteresis: Variable (by user)
Switch Setting: User may adjust switch actuation & deadband to any points within Full

Scale sensor range

Display:

Type: 3½ digit, 10mm LED
Accuracy: ±1.0% FS ± last digit
Display Setting: User may re-configure display scaling, set to capture MIN or MAX value,

and adjust display update rate

Standard Ranges (Gauge):

0 to 50psig, 100psig, 150psig, 300psig, 500psig, 1000psig, 1500psig

Standard Ranges (Compound):

–15 to 15psig, –15 to 75psig, –15 to 150psig, –15 to 300psig

ENVIRONMENTAL SPECIFICATIONS
Temperature Limits:

Storage: –30 to 60ºC (–22 to 140°F)
Operating: –20 to 60ºC (–4 to 140°F)
Compensated: –10 to 50ºC (14 to 122°F)
Temperature Effects:
Zero/Span: ±0.05% FS/°C (from 23°C (–73°F) reference temperature)

Humidity: 0-85% RH (Non-Condensing)
FUNCTIONAL SPECIFICATIONS

Proof Pressure: 2X Range
Burst Pressure: 10X Range
CE Compliance: EN61326-1 2006, EN61326-2-3 2006

ELECTRICAL SPECIFICATIONS

Power Supply Requirements:

Supply Voltage: 11-27Vdc
Current Consumption: 30mA (max)
Switch Contacts: (2) NPN or PNP Open Collector Outputs
NPN Type: 30Vdc/80mA (max)
PNP Type: Sensor Supply Voltage/80mA (max)

MECHANICAL SPECIFICATIONS

Pressure Connection: ¼ NPT Male, G¼B (Opt.)
Enclosure: ABS, Polycarbonate, Aluminum
Rating: IP40
Electrical Connection: 6ft Cable Pigtail
Weight: Approx. 120 grams
Mounting: Panel Mounting Bracket included (Back Connect Only)
Media: Fluids and gases compatible with 304SS (sensor housing) and 17-4 pH SS

(sensor diaphragm)

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