ARSCROFT GC30 Indicating Ultra-Compact Digital Differential Pressure Transducer Instructions

GC30 Indicating Ultra-Compact Digital Differential Pressure
Transducer Instructions 

Indicating Ultra-Compact Digital Differential Pressure Transducer

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  nstrument 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.

SPECIFICATIONS:
Performance Speclflcations
Analog Output (1–5Vdc):
Accuracy ± 1.5% 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: ± 1.5% 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: ± 1.5% 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 0.25˝WC, 0.50˝WC, 1.0˝WC, 2.5˝WC, 5.0˝WC, 10˝WC, 25˝WC
Standard ranges (Compound):
±0.25˝WC, ±0.50˝WC, ±1.0˝WC, ±2.5˝WC, ±5.0˝WC, ±10˝WC, ±25˝WC
ENVIRONMENTAL SPECIFICATIONS
Temperature limits:
Storage: –30 to 60ºC (–22 to 140ºF)
Operating: –20 to 60ºC (–4 to 140ºF)
Compensated: –10 to 50ºC (14 to 122ºF)
Temperature Effects:
Zero and Span (from 23°C (73°F) reference temperature)
±0.15% FS/ºC, ±0.0.9% FS/ºF: (±2.5˝WC, 0/2.5˝WC and below)
±0.10% FS/ºC, ±0.0.6% FS/ºF: (±5.0˝WC, 0/5.0˝WC and above)
humidity : 0–85% RH (Non–Condensing)
FUNCTIONAL SPECIFICATIONS
Proof Pressure: 7.5psid
Burst Pressure: 25psig
Max Static (Line) Pressure: 7.5psi
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 1Vdc/80mA (max)
MECHANICAL SPECIFCATIONS
Pressure Connection: 4mm ID Barb
enclosure: ABS, Polycarbonate, Aluminum
rating: IP40
electrical Connection: 6ft Cable Pigtail
weight: Approx. 75 grams
Mounting: Panel Mounting Bracket Included
Media: Clean, dry air gases compatible with Aluminum, ABS, Ceramic, Silicon, and Silicone RTV
PrODUCT DIMeNSIONS:

INSTAllATION

Install in a location where vibration and shock can be minimized and without direct sunlight on the display in compliance with IP40 environmental rating.
Note: Panel mount adapter for back connection only. Do not attach panel mount adapters prior to panel installation or out of sequence as stated below.

1. Take Panel Adapter #1 (tube notch faced down) and mount to the main body with panel placed in between as pictured. Push adapter and main body together until tabs engage notches.
2. Take Panel Adapter #2 (tube notch faced down) and attach to the back of the main body. Push until panel adapter tabs engage the main body notches.
3. Gently push panel adapters together until gaps are minimized.

WIRING
Cable wire colors are shown below. Power on after checking connections. When on, wait at least 5 minutes before performing a zero point adjustment or measurement to ensure system is stabilized.
Cable color

Analog Output (1-5VDC) NPN Type Switch function (wiring to relay) NPN Type Switch function (wiring to Photo Coupler) NPN Type Switch function (Voltage Output) PNP Type Switch function (wiring to relay) PNP Type Switch function (wiring to Photo Coupler) PNP Type Switch function (Voltage Output) NOISE PREVENTION
Power Supply
The pressure display can fluctuate and provide incorrect output if noise is present in the power supply/wires. Care should be taken to keep the GC30 power supply wires from high voltage lines and use a power line with a high noise rejection ratio.
STORAGE
Store in a location in compliance with the environmental rating of the unit and within –30 to +60C (–22 to 140F). Avoid direct exposure of the display to Sunlight.

MAINTENANCE

Although this is a solid state device, it is recommended that a visual inspection be conducted twice a year along with regular zero adjustment if necessary.
MENU NAVIGATION
functions
Please Note: Do not use sharp objects to press the keys as this can puncture the panel. See illustration for External Panel and Functions.

Pressing the MODE key for 3 seconds displays “—”. To return to measurement mode from each setting mode, the “—” display will flash when 3 seconds have passed.

FUNCTION SETTING MODE
Setup Steps
Pressing the MODE key for 3 seconds displays “—”. To return to measurement mode from each setting mode, the “—” display will flash when 3 seconds have passed. The setting mode is used to select switch operation, pressure unit indication scaling, scaling of analog output and filter time constant. Caution: Editing the setting value in function setting mode resets all of the setting values including the switch. Please note that when the reset setting values are out of the display range, they will be adjusted to an upper or lower limit value that can be processed internally.
9A. SWITCH OPERATION
Select “Switch Operation Selection” with the MODE key. The message is displayed for 1 sec. and then the current setting is displayed. Select either hysteresis or switch operation display with the keys.

9b. DISPlAY SELECTION
Select “Display Selection” with the MODE key. The message displayed for 1 sec. and then the current setting is displayed. Select pressure display by PSI or display scaling (Arbitrary units defined by user) with the keys.
9C. SELECTING STANDARD OR CUSTOM SCAlING MODE
When the is selected in “Display Selection”, the display value of Pressure for applied displays as an arbitrary scaling display. This is a function to scale the MIN/MAX display value and has NO effect on applied pressure and analog output.
9D. CUSTOM SCAlING MODE
Use the MODE key to set “Decimal point position”, “Minimum pressure range display value” and Maximum pressure range display value” of “Display scaling”.
Example: With a pressure range of 0 to 25inWC (0 to 100% FS), main unit display of 00.0 to 25.0 (factory set) is changed to a display of 0.000 to 1.000.

| Dec. point position (from least significant digit)
---|---

| Min. pressure range value:

| Max. pressure range value:

0.1 .003
0.0 .000
25.0 1.000
9e. FIlTER SRCTION
The GC30 is equipped with 5 internal time constant filters. Use this function when pressure fluctuations can result in erratic, difficult to read displays. The time constant for  the selected fil ters reflects on the switch outputs as well as the analog output.
Select “Filter Selection” with the MODE key. The message  is displayed for 1 sec. and then the current setting mode’s decimal point position is displayed. Change the decimal point position value with the keys.
Entering the setting value in function setting mode resets all of the setting

| No filter
---|---

| Time constant 25ms

| Time constant 250ms

| Time constant 2.5 sec

| Time constant 5 sec

| Time constant 10 sec

9f. ANAlOG OUTPUT SCAlING
This mode is for setting the pressure for the analog output zero point and span point. Display by analog selection is scaled as 0 to 100% (Zero point: 1Vdc, Span: 5Vdc).  Select “Analog Scaling” with the MODE key.
The message is displayed for 1 sec. and the current pressure’s analog output zero point (1Vdc) is displayed as a percentage. Change the numeric value with the  keys.
The message  is displayed for 1 sec. and the analog output span point’s pressure can be set in the same way using the keys.
example: With Analog output of 1 to 5Vdc at pressure range of 0 to 10.0in WC (0 to 100% FS), output is changed to 1 to 5Vdc at 0 to 9.0inWC.
Set the analog output zero point: 0.0% FS0.0% FS (1Vdc output with pressure range 0% FS).
Set the analog output span point: 100.0% FS90% FS (5Vdc output with pressure range 90% FS).
SWITCH SETTINGS MODE
Setup Steps
In Measurement Mode press the key (release within 3 sec.) to change to Switch Setting Mode.
Switch Setting Mode
There are two switches, OUT1 and OUT2. Both “Hysteresis (upper/lower limit)” and “Window Comparator” operations can be selected in the function setting mode (switch operation selection). Those two  operations can be  selected at once, and can be set.  Both OUT1 and  OUT2 can be  set  independently to a max on/off delay of 2 seconds. In the following explanation If the switch’s output conditions  are  met  their  output state will become On, and  “Switch LED (OUT1, OUT2)”  will light up.
NOTE: if the switch’s setting value is set outside the display range, the switch’s setting value can be rewritten automatically by the function setting mode operation. 11. SWITCH OPERATION – HYSTERESIS/DEADBAND
Setting the upper limit.
This is the mode in which the switch operates with the setting value (A) as the upper limit. The upper limit setting is determined when you select a positive number (including 0) for setting value (b). Setting the lower limit.
This is the mode in which the switch operates with the setting value (A) as the lower limit. The lower limit setting is determined when you select a negative number for setting value (b). window Comparator Operations
For (A)<(b)

For (A)<(b) The 1% F.S. deadband is automatically set internally for setting point (A) and (b). loop check function
At the end of the Switch Operation Menu is the Loop Check function. Using the MODE key to select the Loop Check function. After is displayed for 1 second, the value  of the latest measurement mode is displayed as default. Use  keys to  set displayed value anywhere between –1999 and  1999 to confirm switch operation and/or  analog output operation.
OThER FUNCTIONS
basic key operations
In all setting modes, values are set with the keys. Use the key to increase and the key to decrease the value. A repeat state occurs in th phases of speed when the keys are pressed for more than 0.5 seconds to increase or decrease numerical value. keys are also used for setting switch, unit and filter in the function setting mode.
RE -Zero of Sensor
In measurement mode, select display to adjust zero using key. Press MODE + keys formore than 3 seconds (unit “—” display blinks) after releasing pressure from the pressure port. Automatic zero adjustment takes place approximately 1 second later for pressure display to be zero.
When the zero adjustment is successful, is displayed.
Error displays for 1 second when applied pressure was outside of range of –10 to 10% FS, zero adjustment will not be allowed.
Maximum/Minimum Pressure Capture
The GC30 unit keeps the maximum and minimum pressure level applied to the pressure port as peak and bottom values respectively, in the internal memory. The peak and bottom values are displayed while holding the or keys respectively. Message pe+ is displayed for one second and selected Max/Min value is displayed by this operation. Maximum and minimum values are reset when you reset power to the unit or by the following procedure: Resetting Maximum value: While holding the key, pressure the  key.
Resetting Minimum value: While holding the key, press the key.
Key lock
Key operations can be turned off to prevent inadvertent overwriting of setting values. Once the key lock state is set, the function setting, comparator setting, zero point adjust, and loop check modes cannot be accessed. The key lock mode cannot be reset by turning the power OFF and ON. It may be reset only by following the unlocking procedure.
To lock, press the MODE + keys in measurement mode. The message displays lo( for one second, indicating that the unit has entered into the key lock state. To unlock, press the MODE + keys again. The message displays unl for one second indicating that the unit is unlocked.
ERROR DISPlAY
An error message and pressure value are alternately displayed when one of the following errors occurs in the measurement mode (In case of “Out of pressure display range” error, only error message is displayed). Check the content of error message and take the action below immediately.

applied pressure within the rated pressure.
| Out of pressure display range (Lower limit) Pressure below —10% FS had been applied, or the indicated value fell below —1999.
| Pressure applied during the zero point adjustment,was outside the range by
± 10% FS| Open the unit to atmosphere and perform zero point adjusment.
| Comparator 1 overloaded| Drop load current below 80mA before use.
Turn power on again to recover from error status.
| Comparator 2 overloaded
| Comparator 1 & 2 overloaded

14. MAINTENANCE AND WARRANTY
Periodic Inspection
Depending upon the type of use periodic inspection is recommended at least once a year.
Please refer to the following items for periodic inspection.

1. Appearance
2. Display/output check via appropriate pressure standard (1)
3. Display/output check via loop Check (2)

CAUTION

• Avoid electrostatic charging. When cleaning this product, please use a soft, damp cloth.
• Do not use thinner, etc. which may cause deterioration and failure.

Product warranty
Except as otherwise provided, the product warranty of this product is as follows:
Period: 12 months after delivery
Warrantable defects: Defects resulting from the design and manufacture of our company, the quality of the material, etc.
Implementation of warranty: This warranty will be completed by substitution or repair of the product concerned.
Consequential damages caused by product defects are not the reponsibility of the manufacturer.

• If you have any questions about this document, please contact the sales office or distributor nearest you.
• This document is subject to change without notice due to upgrade, etc.
  (1) If zero correction is required refer to section 13.
  (2) Loop check, see section 12.

© 2011 Ashcroft Inc. 250 East Main Street, Stratford, CT 06614 USA
Tel:203-378-8281,
Fax:203-385-0402
www.ashcroft.com
All sales subject to standard terms and conditions of sale.
I&M011-10169 Rev. A 5/11
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Version 5.0 5/11

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