Aalborg 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.
CALIBRATIONS: Supplied at Standard Conditions (14.7 psia and 70
F
F), or Normal
Conditions (0
F
C and 1.01 bar abs) unless otherwise requested or stated.
ENVIRONMENTAL (per IEC 664): Installation Level II; Pollution Degree II.
ACCURACY:
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: GFC17: 300ms time constant; approximately 1 second to within
±2% of set flow rate for 25% to 100% of full scale flow.
GFC 37/47: 600ms time constant; approximately 2 seconds to within
±2% of set flow rate for 25% to 100% of full scale flow.
GFC 57/67/77: 1800ms time constant; approximately 5 seconds to
within ± 2% of set flow rate for 25% to 100% of full scale flow.
MAX GAS PRESSURE: 1000 psig (69 bars) GFC 17, 37 and 47; 500 psig (34.5 bars) GFC
57, 67 and 77. Optimum pressure is 20 psig (1.4 bars).
TURNDOWN RATIO: 40:1.
MAX DIFFERENTIAL PRESSURE: 50 psid (345 kPa).
GAS TEMPERATURE: 32
F
F to 122
F
F (0
F
C to 50
F
C).
AMBIENT TEMPERATURE:14
F
F to 122
F
F (-10
F
C to 50
F
C).
GAS RELATIVE HUMIDITY: Up to 70%.
MAXIMUM INTERNAL LEAK: 0.5% FS.
ACCURACY % FS
OPTIONAL ENHANCED ACCURACY % FS
MODEL
GFC
17, 37
GFC
47, 57, 67, 77
MODEL
GFC 17
GFC
37, 47, 57, 67, 77
FLOW
RANGE
2.5-100% 20-100% 0-20%
FLOW
RANGE
2.5-100% 20-100% 0-20%
ACCURACY ±1.5%
±1.5%
±3%
ACCURACY
±1%
±1%
REF DATA
with ±1%