Ashcroft GC51 User Manual

Quick Start Function Summary Instructions

Note: Holding the
3 seconds returns to

Pressure

Unit Monitor

Measured
Data

Arbitrary
Unit Monitor

MODE key

DOWN key

UP key

CH+ CH–

PSI

M

GC51

Test
Terminals

1

2

3

4 5

6

for ASHCROFT

(See Complete I&M Manual for Further Detail)

®

GC51 Version 6.03

DISPLAY OVERVIEW

Designation

 Measured Data Display

 Pressure unit monitor

 Arbitrary unit monitor

 MODE button M

 DOWN button #

 UP button $

Pressure, linear scaling value, hold value (max./
min), are displayed.

When either indicator is ON, the display is read­ing in PSI.

When this indicator is ON, the linear scaling value
of an arbitrary unit is indicated on the display.

Used to switch the setting mode, the measure­ment mode and the setting item.

Used to change (decrease) and select the set
value and to zero-reset the hold function.

Used to change (increase) and select the set
value and to shift from the measurement mode
to the zero adjustment mode.

Function

1. Upon Power-Up the unit enters “Measure Mode” – displaying

applied pressure.

2. Four functions available to the user in “Measure Mode”.
A. Zero Adjustment Mode: Hold the UP$button for more than

3 seconds.This is not to be used for scaling of the output.

• 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
Setting mode M key greater than 3 sec LoC (Key invalidity)
Peak indicator
Bottom indicator

$
#

$
#

one second LoC (Key invalidity)

$

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

one push Peak indicator
one push Bottom indicator

C. Minimum Value “Capture”*: Press DOWN#button to

display the minimum value. The letter “L” will follow the
reading indicating this is the minimum value. Press the
DOWN button again to return to Measurement Mode.

Note: Press the button and release, do not “hold” the but-

ton down (will reset the values).

D. Maximum Value “Capture”*: Press UP$button to dis-

play the maximum value. The letter “H” will follow the
reading indicating this is the maximum value. Press the
UP$button again to return to Measurement Mode.

Note: If the button is held for 3 seconds it will go into

zero adjustment mode.

Minimum/Maximum Reset

The Minimum/Maximum values can be reset when in
either Minimum/ Maximum display by holding the DOWN

button for more than three seconds, “clr” will appear

#

on the display for two seconds and the Minimum and
Maximum values will be removed.

Note: Values are maintained even if unit is powered OFF.

Hold reset
message

clr

• When first using unit be sure to Reset values to clear
values in memory from the factory calibration
process.

• Values are captured starting one minute after Reset,
thus if unit is powered OFF during the one minute the
values during that period will not be kept in memory.

3. Four functions available to the User via “Setting Mode”. To
enter the “Setting 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 where 0=30ms (and in
this case the filter is not active), 2=60ms, 4=120ms,
8=240ms, 16=480ms, use

keys to change value.

$#

B. Re-scaling in “psi” units: “Pressure Display Mode”

allows for zero (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.

3. To adjust Output Zero Point (4mA) and Output
Span Point (20mA) must be in the functional area
as noted below and then 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 0-100psi
range and the user desired the Output Zero Point
to be “moved” from 0 psi to 50 psi then Output
Zero Point would be 50.0 which is 50%.

© 2008 Ashcroft Inc., 250 East Main St., Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. 02/11 I&M011-10163_GC51_Rev. C_Ver. 6.03

Quick Start Function Summary Instructions

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

for ASHCROFT

(See Complete I&M Manual for Further Detail)

®

GC51 Version 6.03

Notes 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 “psi” unit to any user defined unit.

Note: See menu schematic at end, must be in “Linear

Use
and “Pressure Display Mode.”

-

n non

a 10.0

a 90.0

Display Mode” option within “Setting Mode”, this is
noted on the screen by

-

n L;n

keys to move between “Linear Display Mode”

$#

mode : non Lin: linear

display mode

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

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

D. Loop Check: Use to send a 4-20mA signal meant to

simulate applied pressure, can be accessed either
through Pressure Display Mode or Linear Display Mode.
See “Complete Setting Mode Menu” at end. Loop Check
is noted on the screen with a prefix
is indicating in actual units and starts at the zero
(4mA) point.

If$button continues to be pressed, the linear display
will auto-increment by linkage between the linear display
and the analog output. By continuing to press#button,
auto decrement will occur. Release the button at the
desired indication.

Complete Setting Mode Menu

“

”

. The display

(

Setting LCD Setting Setting

Item Display Description Range

Display Selection of non:pressure

mode pressure display display mode

Minimum Min. pressure Pressure range

pressure corresponding to 0 to 75% Span

Maximum Max. pressure Pressure range

pressure corresponding to 25 to 100% Span

Decimal Display after 0,1,2,3 digit

point decimal point

position Number of digits

OFFSET OFFSET –1999 to 1999

FULL FULL SCALE –1999 to 1999

SCALE corresponding to

Output Analog output Max. display

zero point zero point (4mA) span: –10

Output Analog output Max. display

span point span point (20mA) span: –10

-

n L;n

p 10.0

p 60.0

mode : Lin Lin:Linear display

OFFSET 9

: 10 (psi)

FULL SCALE 10

: 60 (psi)

d 2

d 0.00

d 5.00

a 0.0

a 100.0

corresponding to

min. pressure 6

: 0.00 (ton)

mAX. pressure 7

: 5.00 (ton)

: 0.0 ( %Span) to 110% Span

: 100.0 (%Span) to 110% Span

mode

: 2 (digit)

Notes: Actual values shown are based upon the examples

shown in the I&M Manual.

Changes made within the Setting Mode are saved
by returning to Measurement Mode before powering
the unit “off.”

Note: Values shows are from example in I&M manual.

© 2008 Ashcroft Inc., 250 East Main St., Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. 02/11 I&M011-10163_GC51_Rev. C_Ver. 6.03