Ashcroft GC52 User Manual

Quick Start Function Summary
Instructions for ASHCROFT

®

GC52 Differential Pressure
Transmitter
Version 6.03 Rev. B

(See Complete I&M Manual for Further Detail)

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I&M011-10164-GC52 Ver. 6.03 Rev.B 03/11

2

CH+

CH–

GC52

In H2O

M

▼

▲

b

Differential pressure
unit monitor

Test Terminals

d

MODE key

e

DOWN key

f

UP key

c

Scaling - Arbitrary
unit monitor

h No function

a

Measured data
display

8.8.8.8.8.8.

k Total flow volume

display (X100)

l Total flow volume

display (X1000)

g

Linear scaling mode

j Total flow volume

display (X10)

i Total flow volume

display (X1)

DISPLAY OVERVIEW









DESIGNATION FUNCTION



Measured data
display



Differential
pressure unit
monitor



Scaling; arbitrary
unit monitor



MODE key M



DOWN key S



UP key T



Linear scaling
mode



No function

to

volume display



Differential pressure, linear scaling value are displayed.

When this unit monitor is ON, the differential pressure
(in H

O) is indicated on the measured data display.

2

When this unit monitor is ON, the scaling value of an
arbitrary unit (linear scaling), is indicated on the
measured data display.

This key is used to switch the setting mode and the
measurement mode and to change the setting item.

This key is used to change (decrease) and select the
set value.

This key is used to change (increase) and select the set
value and to shift from the measurement mode to the
zero adjustment mode.

Change differential pressures into quantity

Total flow

None

Accumulated volume calculated based on flow rate















3

11..

Note: Holding the button for more than
3 seconds returns to display mode.

UPON

POWER-UP the unit enters “Measure Mode” – displaying applied pressure.

22..

O FUNCTION is available to the user in “Measure Mode”.

TW

A. Zero Adjustment Mode: In the measurement mode,

the pressure connection is open to the atmosphere and $key is
pressed for more than 3 seconds in order to shift to zero adjustment
mode for zero point adjustment of the differential pressure sensor

• If the zero point adjustment is performed correctly the message “ADJ”
will be displayed for 2 seconds, and the display will return to the meas­urement mode.

B. Key Lock

Function Key Manual Indicator

Setting of key lock MODE+
Release of key lock MODE+$one second UnL (Key invalidity)

Operation during keylock

Function Key Manual Indicator

Zero adjust. mode
Hold value reset

33..

FI

VE FUNCTIONS available to the User via “Setting Mode”. To enter the “Set-

$
#

one second LoC (Key invalidity)

$

key greater than 3 sec LoC (Key invalidity)
key greater than 3 sec LoC (Key invalidity)

ting Mode” hold (M) key for more than 3 seconds.
(See last page for complete Setting Mode menu.)

A. Filter (Damping)

The filter is based on the moving average of the pressure data to de­crease display “bounce” and to smooth the analog output due to system
pressure fluctuations at the user’s discretion.

Five selections: (0, 2, 4, 8 and 16 seconds), Use

$#

keys to change value.
If “0” is selected the filter is not applied.

B. Re-scaling in “inH

O” units: “Pressure Display Mode” allows for zero

2

(4mA) and span (20ma) adjustment of –10 to +110% Span respectively.

Note: 1. See menu schematic on last page for detail.

2. Must be in “Pressure Display Mode” option within “Setting Mode,”

this is noted on the screen by

-

n non

Use $#keys to move between “Pressure Display Mode” and
“Linear Display Mode” which is for re-scaling in “Arbitrary” units.

4

3. To adjust Output Zero Point (4mA) and Output Span Point
(20mA) the unit must be in the functional area as noted below
while adjustment is via $#keys. The value shown is a percent­age of the pressure range (span) as noted on the product label
(ex. If product was supplied as a 0-40 IWC range and the user de­sired the Output Zero Point (4mA) to be “moved” from 0 IWC to 20
IWC then Output Zero Point would be 50.0 which is 50%.

Values shown below are from I&M manual.

Setting LCD Setting Setting

Item Display Description Range

Display Selection of non:pressure

mode pressure display display mode

Output Analog Pressure

zero point output zero point range:–10

.

Output Analog Pressure

span point output span point range:–10

Note: For setting of zero point and span point in the analog
output, input the percent value over the pressure range.

C. Re-scaling in “Arbitrary” units, “Linear Display Mode.” This function

allows the user to establish a linear relationship from the standard “inH
unit to any user defined unit.

Note: See menu schematic on last page. Unit must be in “Linear Display
Mode” option within “Setting Mode”, this is noted on the screen by

-

n non

a 10.0

a 90.0

mode : non Lin: linear

(4mA) : 10.0 (%Span) to 110% Span

(20mA) : 90.0 (%Span) to 110% Span

display mode

O”

2

-

n L;n

Use $#keys to move between “Linear Display Mode” and “Pressure
Display Mode.”

5