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The new Ashcroft® Model GC55 is a compact high differential pressure transducer, ideal for filter monitoring, HVAC hydronic cooling and heating systems and pump controls. A three wire 4-20 mA or 1-5 Vdc output signal connects the transducer to external controls or data acquisition.
The GC55 contains two polysilicon thin film sensors with welded Stainless Steel wetted components to accommodate wet or dry pressure media up to 300 psid. A robust cast aluminum housing features a bright LED front panel display for local indication along with a button to allow the user to select between the dP value and the line pressure readings from either sensor. The user also has the ability to re-range the transducer and set trip points for the on-board switch contacts.
Two sensor DP design means three measurement
variables in one device. Output, display and switch
settings can be set in nearly ANY independent
configuration to monitor, high pressure port (P1),
low pressure (P2), differential (P1-P2).
PERFORMANCE SPECIFICATIONS
Analog Output (4-20mA or 1-5Vdc):
Accuracy: ± 0.5% FS (Accuracy includes the
effects of Linearity, Hysteresis and Repeatability)
Response Time: 20msec
Output Resolution: 0.2% FS
Pressure Switch Output:
Type: (2) photo MOS relays, rated to 40Vdc/200mA
Setting Accuacy: ± 1.0% FS
Number of Contacts: 2
Response Time: 20msec – 2.0 sec (by user)
Hysteresis: Variable (by user)
Display:
Type: 31⁄2 digit, 10mm LED
Accuracy: ± 1.0% FS (URL) + last digit
Standard Ranges (Differential):
75psi
100psi 250psi
150psi 300psi
ENVIRONMENTAL SPECIFICATIONS
Temperature Limits:
Storage: –20 to 60°C (–4 to 140°F)
Operating: –10 to 50°C (14 to 122°F)
Compensated: –10 to 50°C (14 to 122°F)
Temperature Effects:
Zero/Span: ±0.05%FS/°C (from 23°C reference
temperature)
FUNCTIONAL SPECIFICATIONS
Static (Line) Pressure:*
Pressure Range Proof Burst
All 2X FS (URL) 10X FS (URL)
Static (Line) Pressure Effects: None
Single Side (Differential) Limits:*
Pressure Range Proof Burst
All 2X FS (URL) 10X FS (URL)
*Note Maximum operating line pressure is the range
(URL) of the unit ordered.
ELECTRICAL SPECIFICATIONS
Transducer Supply Supply
Output Signal Voltage Current
4-20mA (3 wire) 15-27 Vdc 80mA
1-5Vdc (3 wire) 11-27 Vdc 60mA
Switch Contacts: (2) Photo M0S relay outputs; Load
200mA (max), 40Vdc; ; Hysteresis (variable)
Rangeablility / Adjustment*:
Zero –105% to +105% FS
Span –105% to +105% FS
*Note: Accuracy based upon full scale (URL) value
MECHANICAL SPECIFICATIONS
Pressure Connection: 1⁄8 Female NPT (2)
Enclosure: Aluminum
Rating: IP66
Electrical Connection:
– 1⁄2 Female NPT Conduit
– Cable Gland (cable diameters 0.16 to 0.31)
Weight: Approx. 1.0 lb
Mounting: (2) 5.2mm mounting holes (see installation
drawings on back page)
Media: Fluids and gases compatible with
304SS (sensor housing) and 17-4 pH SS
(sensor diaphragm)
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