• Rigid metallic construction
• Accuracy for GFC models 17, 37 & 47
• ±1.0% of FS
• Accuracy for GFC models 57, 67 & 77
• ±1.5% of FS (at 20-100% of flow range)
• ±3% of FS (at 0-20% of flow range)
• Maximum pressure
• GFC 17, 37 and 47: 1000 PSIG (70 bar)
• GFC 57, 67 and 77: 500 PSIG (34.5 bar)
• Leak integrity maximum to the outside environment
• 1 x 10-9 smL/sec of helium
• NIST traceable certification
• Built-in tiltable LCD readout
• Local or remote setpoint control
• 0-5VDC and 4-20mA signals
• Circuit protection
• Totalizer option

CALIBRATIONS: Performed at standard conditions [14.7 psia (101.4 kPa) and 70 FF (21.1FC)] unless otherwise requested.
REPEATABILITY: ±0.25% of full scale.
RESPONSE TIME: Generally 2 seconds to within ±2% of actual flow rate over 25 to 100% of full scale.
TEMPERATURE COEFFICIENT: 0.15% of full scale / FC.
PRESSURE COEFFICIENT: 0.01% of full scale / psi (0.07 bar).
PRESSURE DROP: See Table 14.
OPTIMUM GAS PRESSURE: 25 psig (1.73 bars).
MAX. GAS PRESSURE: 1000 psig (70 bars) maximum GFC 17, 37, 47. 500 psig (34.5 bars) GFC 57, 67, 77.
TURN DOWN RATIO: 40:1.
MAX. DIFF. PRESSURE: 50 psi for GFC 17/37/57/67 and 77 (3.4 bars), 40 psi for 47 (2.7 bars).
GAS and AMBIENT TEMP: 32 FF to 122 FF (0 FC to 50 FC). 14 FF to 122 FF (-10 FC to 50 FC) - Dry gases only.
**MATERIALS FLUID CONTACT:
a. Aluminum models GFC Series: anodized aluminum, 316 stainless steel, brass and Viton® O-rings.
b. Stainless steel models GFC17S, 37S, 47S, 57S, 67S and 77S: 316 stainless steel and Viton® O-rings.
Optional O-rings: Buna®, EPR and Kalrez®.
ATTITUDE SENSITIVITY: No greater than +
15 degree rotation from horizontal to vertical; standard calibration is in horizontal position.
OUTPUT SIGNALS: Linear 0-5 Vdc. (1000 ohms min. load impedance); 4-20 mA (0-500 ohms loop resistance) Max noise ±20mV.
COMMAND SIGNALS: Analog 0-5 Vdc or 4-20 mA for remote set point mode; NPN compatible purge /valve off.
CONNECTIONS:
GFC 17: 1/4" compression fittings. Optional: 6mm, 3/8" and 1/8" compression fittings or 1/4" VCR®
GFC 37: 1/4" compression fittings. Optional: 6mm and 3/8" compression fittings or 1/4" VCR®
GFC 47: 3/8" compression fittings.
GFC 57: 3/8" compression fittings.
GFC 67: 1/2" compression fittings.
GFC 77: 3/4" FNPT fittings. Optional: 3/4" compression fittings.
LEAK INTEGRITY: 1 x 10-9 smL/sec of helium maximum to the outside environment.
TRANSDUCER INPUT POWER:
GFC 17, 37 and 47: Universal +12 Vdc to 26 Vdc, 200 mA maximum.
GFC 57, 67 and 77: +12 Vdc, 800 mA; +24 Vdc, 650 mA optional.
CIRCUIT PROTECTION: Circuit boards have built-in polarity reversal protection. Resettable fuses provide power input protection.
DISPLAY: 3-1/2 digit LCD, 0.5" high characters.
CE COMPLIANT: EN 55011 class 1, class B; EN50082-1

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