Dwyer GFC User Manual
Page 10
6
4. SPECIFICATIONS
FLOW MEDIUM: Please note that GFC Mass Flow Controllers are designed to work with
clean gases only. Never try to meter or control flow rates of liquids with any GFC's.
CALIBRATIONS: Performed at standard conditions [14.7 psia (1.01 bars) and 70
0
F
(21.1
0
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
0
F to 77
0
F (15
0
C to 25
0
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/
0
C.
PRESSURE COEFFICIENT: 0.01% of full scale/psi (0.07 bar).
RESPONSE TIME: GFC-110/111: 300ms time constant; approximately 1 second to
within ±2% of set flow rate for 25% to 100% of full scale flow.
GFC-113/114: 600ms time constant; approximately 2 seconds to
within ±2% of set flow rate for 25% to 100% of full scale flow.
GFC-1143/1144/1145:1800ms time constant; approximately 5
seconds to within ± 2% of set flow rate for 25% to 100% of full
scale flow.
GAS PRESSURE: 500 psig (34.5 bars) max; optimum pressure is 20 psig (1.4 bars).
MAX DIFFERENTIAL PRESSURE: 50 psid for GFC17/37/57/67/77, 40psid for GFC47.
GAS AND AMBIENT TEMPERATURE: 32
0
F to 122
0
F (0
0
C to 50
0
C).
RELATIVE GAS HUMIDITY: Up to 70%.
LEAK INTEGRITY: 1 x 10
-7
sccs He max to the outside environment.
ATTITUDE SENSITIVITY: No greater than ±15 degree rotation from horizontal to vertical;
standard calibration is in horizontal position.
OUTPUT SIGNALS: Linear 0 to 5 VDC (1000
Ω minimum load impedance) and 4 to 20
mA (50 to 500
Ω loop resistance); 20 mV peak to peak max noise for
GFC-110/111/113/114 and 100 mV peak to peak max noise for GFC-1143/1144/1145.
COMMAND SIGNAL: Analog 0 to 5 VDC (100
Ω input impedance) or 4 to 20 mA (0 to
250
Ω loop resistance).
Contact your distributor or Dwyer for optional RS232 or IEEE488 interfaces.
TRANSDUCER INPUT POWER: +12 VDC, 1100 mA maximum;
GFC-110/111/113/114 have an OPTION of +24 VDC, 650 mA maximum -
IF SPECIFIED AT TIME OF ORDERING AND CONFIGURED ACCORDINGLY.