Ashcroft GC55 User manual

© 2011 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.
I&M011-10158. Rev. C 5/11
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WARNING! READ
BEFORE INSTALLATION
1. GENERAL:
A failure resulting in 273>;B or -*6*0. 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 trans-
ducer may cause 2;;.?.;<2+5..5.,=;2,*5*7-8;6.,1*72,*5-*6*0.to the
pressure measuring and containing elements.
5>2-1*66.; 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 sudden-
ly 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.
2:>2-<>;0.< 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 over-
pressure 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:
• round 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.
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";.<<>;.#*70. 75, 100, 150, 250, 300 psid
(as noted on the unit)
";88/";.<<>;. 2X F.S.
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2<95*B#*70. Diff. pressure range of –5 to 105%F.S. or display of
–1999 to 1999
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• 4-20ma Output Version: 15-27 Vdc, 80mA
• 1-5 Vdc Output Version: 11-27 Vdc, 60mA
2<95*B 31⁄2digit LED (digit height: 10mm)
Display accuracy
∆P : ±(1.0%F.S.+1 digit)
P1, P2 : ±(0.5%F.S.+1 digit)
&9-*=.%26. 0.2 s
.-2*(.==.-*=.;2*5< Fluids and gases compatible with 304SS
(sensor housing) and 17-4ph SS (sensor diaphragm)
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Accuracy: ± 0.5% FS (Accuracy includes the effects of Linearity,
Hysteresis and Repeatability)
Temperature characteristics
∆P : Zero ±0.1%F.S./°C
: Span ±0.1%F.S./°C
P1, P2 : Zero ±0.05%F.S./°C
: Span ±0.05%F.S./°C
Response Time: 20msec – 10.0 sec (by user)
Output Resolution: 0.2% FS
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Type: (2) photo MOS relays, rated to 40Vdc/200mA
Setting Accuacy: ± 1.0% FS
Number of Contacts: 2
Hysteresis/Deadband: Variable (by user)
Window Comparator: 1%F.S. fixed
Delay: 0-2.00s (both ON, OFF)
8*-;.<2<=*7,. 10kΩ min-500Ω max.
!9.;*=270%.69.;*=>;. –10 to 50°C (14 to 122°F)

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–20 to 60°C (–4 to 140°F) (non freezing)
*<.,87<=;>,=287 IP65/NEMA 4
";.<<>;.877.,=287<1⁄8NPT Female (2) places
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(.201= 18 ounces
*Option selected at time of order.
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Install in a location where vibration and shock can be minimized and without
direct sunlight on the display in compliance with IP64 environmental rating.
• Pressure Port Connections: 1⁄8NPT female, 11⁄2turns past hand tight.
• Mounting: Remove the C55 cover, 4 screws, and attach via through
holes, (2) places, 0.20˝ diameter.

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If noise is present in the power supply / wires the pressure display can fluc-
tuate and provide incorrect output. Care should be taken to keep the C55
power supply wires from high voltage lines and use a power line with a high
noise rejection ratio.
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Store in a location in compliance with the environmnetal rating of the unit
and within –20 to +60C (–4 to 140F).Avoid direct exposure of the display to
sunlight
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Although this is a solid state device a twice yearly visual inspection is rec-
ommended along with regular zero adjustment if necessary.
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PLEASE NOTE: Only the “SEL” function is available from the case exterior,
accesss to all other functions requires the cover to be removed. Do not use
sharp objects to press the keys as this can puncture the panel. See illustra-
tion 1 and illustration 2.
External Panel and Functions (SEL key can be operated externally)
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The terminals are as shown below. Connect power only after checking wiring.
After power is turned on, wait at least 15 minutes before performing a zero
adjustment or measurement.
Power supply (−)
Power supply (＋)
Cable Gland or 1/2 FNPT
Conduit Connection
COM. (Switch)
OUT 2 (Switch)
OUT 1 (Switch)
Analog output
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Internal Panel and Functions (cover removed)
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External Panel and Functions (SEL key can be operated externally)

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Pressing the key for 3 seconds displays “---”. To return to
measurement mode from each setting mode, the “---” display will
flash when 3 seconds have passed.
MODE
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Pressing the key for 3 seconds displays “---”.
To return to measurement mode from each setting mode, the “---” dis-
play will flash when 3 seconds have passed. The setting mode is
used to select switch operation, pressure unit, indication scaling, scal-
ing of analog output, and filter time constant.
MODE
*Note: Zero Adjustment, select P1 and P2 respectively and then use Zero
Adjustment, will not function in DP mode.




Entering 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.
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Select “Switch Operation Selection” with the key. The message
is displayed for 1 sec. and then the
current setting is displayed. Select either hysteresis or switch operation dis-
play with the ▲▼ keys.
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Select “Display Selection” with the key. The message
displayed for 1 sec. and then the current setting is displayed. Select
pressure display by PSI or display scaling (Arbitrary units defied
by user) with the keys.
$,*52702<95*B8/ ∆"(Used for arbitrary unit, user defined, scaling)
When the is selected in“Display Selection”, the display value of
∆P for applied pressure displays as an arbitrary scaling display. This is a
function to scale the min/max display value for ∆P display and has no effect
on applied pressure and analog output.
Select “Display Scaling of ∆P with the key. The message is
displayed for 1 sec. and then the current setting mode’s decimal point posi-
tion is displayed. Change the decimal point position value with the ▲▼ keys.
The pressure range min/max value can be set in the same way using the
and ▲▼ keys. The pressure range min/max display values are
stored internally as operation coefficients. When “Display Scaling”
is selected, these coefficients are used for scaling and LED display.
Ex.) With a pressure range of 0 to 150 psid (0 to 100% F.S.), main unit dis-
play of 000.0 to 150.0 (factory set) is changed to a display of 0.000 to 1.000.
(User defined unit, in this case 1MPa)
Dec. point position (from least significant digit): 0.1
→ .003
Min. pressure range value: 0.0 → .000
Max. pressure range value: 150.0 →1 .000
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The C55 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 filters reflects on the switch outputs as well as
the analog output.
Select “Filter Selection” with the MODE key. The message is dis-
played for 1 sec. and then the current setting mode’s decimal point position
is displayed. Change the decimal point position value with the ▲▼ keys.
npa
MODE
MODE
f1l
d-k
d-l
d-p
MODE
MODE
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d-p
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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 10sec
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Select “Analog Selection” with the key. The message is
displayed for 1 sec. and then the pressure of analog output is displayed.
Select ∆P, P1 or P2 with the ▲▼ keys.
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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 or
4mA dc, Span : 5Vdc or 20mA dc). Select “Analog Scaling” with the
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 analog output span point’s pressure can be set in the same way
using the and ▲▼ keys.
Ex.) With Analog output of 1 to 5Vdc at pressure range of 0 to 100 psid (0
to 100%F.S.), output is changed to 1 to 5Vdc at 0 to 90 psid.
Press. at time of analog output zero point: 0.0% F.S.
→ 0.0% F.S.
(1Vdc output with pressure range 0% F.S.)
Press. at time of analog output span point: 100.0% F.S.
→ 90% F.S.
(5Vdc output with pressure range 90% F.S.)
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In Measurement Mode press the key (release within 3 sec.) to
change to Switch Setting Mode.
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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
a-k
a-l
a-k
a-l
ana
MODE
MODE
MODE
MODE
f-5
f-4
f-3
f-2
f-1
f-0


independently to a max on/off delay of 2 seconds. In the following explana-
tion, if the switch’s output conditions are met their output state will become
On, and “Switch LED (OUT1, OUT2)” will light up.
PLEASE NOTE that if the switch’s setting value is set outside the
display range, the switch’s setting value can be rewritten automati-
cally by the function setting mode operation.

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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).
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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 neg-
ative number for setting value (b)

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In measurement mode press the + ▲▼ keys (release within
3 sec.) to change to Loop Check Mode.
Regardless of applied pressure, display and analog output can be tested
manually using the ▲▼ keys, useful for simulation testing of the analog
output and switch output wiring. After the switch setting press for 1
sec. to change into Loop Check Mode. The initial value will be the value
displayed immediately before entering Loop check mode.
lop
MODE

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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
three 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.
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In measurement mode, select display to adjust zero using key.
Press + ▲▼ keys for more than 3 seconds (until “---” display
blinks) after releasing pressure from the pressure port. Auto-matic 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 presure was outside of
range of –5 to 5% F.S., zero adjustment will not be allowed.
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Only when display scaling is selected in display select on function
setting mode, zero adjustment can be done. Press + ▼keys for
more than 3 seconds (until “---” display blinks) after releasing pressure
from the pressure ports. Automatic zero adjustment takes place approxi-
mately 1 second later.
et[
MODE
e-0
adj
SEL
MODE

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The C55 unit keeps the maximum and minimum pressure level applied
to the pressure port as peak and bottom values respectively, in the inter-
nal memory. The peak and bottom values are displayed while holding the
▲or ▼keys respectively. Message 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 fol-
lowing procedure:
Resetting Maximum value: While holding the ▲key, press the ▼key.
Resetting Minimum value: While holding the ▼key, press the ▲key.
.B8,4
In measurement mode, press the +keys after the mes-
sage displays for 1 second, indicating that the unit has entered
into the key lock state. All operations except Maximum / Minimum hold dis-
play and display selections cannot be accessed. The key lock mode can-
not be reset by turning the power OFF and ON. It can be reset only by fol-
lowing the unlocking procedure.
Press the + keys, message displays for
1 second and key lock is canceled.
unl
MODE
lo[
SELMODE
SEL
pe+
When zero adjustment is successful, displays. When in –1999
to 1999 of display range, adjustment can be done.
On ∆"display scaling of function mode , zero adjustment value is
reset and returns to initial value when each setting changes.
displays for 1 second when ∆"zero adjustment cannot be done.
adj
e-0
et[