Dwyer GFM - Manual (Page 9)

4. SPECIFICATIONS
FLOW MEDIUM: Please note that GFM 1101 thru 1145 Mass Flow Meters are designed to
work with clean gases only. Never try to meter or control flow rates of liquids with any GFM's.
CALIBRATIONS: Performed at standard conditions [14.7 psia (1.01 bars) and 70 F F
(21.1 F C)] unless otherwise requested or stated.
ENVIRONMENTAL (per IEC 664): Installation Level II; Pollution Degree II.
ACCURACY: ±1.5% of full scale, including linearity for gas temperatures ranging from 59 F
F to 77 F F (15 F C to 25 F C) and pressures of 5 to 60 psia (0.35 to 4.1 bars).
REPEATABILITY: ±0.5% of full scale.
TEMPERATURE COEFFICIENT: 0.15% of full scale / F C.
PRESSURE COEFFICIENT: 0.01% of full scale /psi (0.07 bar).
RESPONSE TIME: 800 ms time constant; approximately 2 seconds to within ±2% of set
flow rate for 25% to 100% of full scale flow rate.
GAS PRESSURE: 1000 psig (69 bars) 10, 50 and 100 L/min; 500 psig (34.5 bars) 200,
500 and 1000 L/min; optimum pressure is 20 psig (1.4 bars).
GAS AND AMBIENT TEMPERATURE: 32 F F to 122 F F (0 F C to 50 F C).
RELATIVE GAS HUMIDITY: Up to 70%.
LEAK INTEGRITY: 1 x 10 - 7 sccs He max. to the outside environment.
ATTITUDE SENSITIVITY: 1% shift for a 90 degree rotation from horizontal to vertical; stan-
dard calibration is in horizontal position.
OUTPUT SIGNALS: Linear 0-5 VDC (1000
Ω minimum load impedance) and 4-20 mA
(0-500 loop
Ω resistance); 20 mV peak to peak max noise.
Contact your distributor or Dwyer for optional RS232 or IEEE488 interfaces.
TRANSDUCER INPUT POWER: +12 VDC, 200 mA maximum; +24 VDC optional.
Power input is protected by a 750mA M (medium time-lag) resettable fuse, and a rectifier
diode for polarity protection.
WETTED MATERIALS:
GFM-110 thru 1145: Anodized aluminum, brass, and 316 stainless steel with
VITON
® O-rings seals; BUNA-N ® , NEOPRENE ® or KALREZ ® O-rings are optional.
GFM-1101 thru 1145: 316 stainless steel with VITON ® O-rings seals; BUNA-N ® , NEOPRENE ®
or KALREZ ® O-rings are optional.
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