Aalborg GFM 17 - 4 Specifications

4. SPECIFICATIONS
FLOW MEDIUM: Please note that GFM17/37/47/57/67/77 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:
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).
14
F
F to 122
F
F (-10
F
C to 50
F
C) - Dry gases only.
RELATIVE GAS HUMIDITY: Up to 70%.
LEAK INTEGRITY: 1 x 10
- 7
sccs He max. to the outside environment.
ATTITUDE SENSITIVITY: Incremental deviation of up to 1% full scale from stated accura-
cy, after re-zeroing.
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 Aalborg 7 for optional RS232 or IEEE488 interfaces.
5
ACCURACY %FS OPTIONAL ENHANCED ACCURACY %FS
MODEL
GFM
17, 37
GFM
47, 57, 67, 77
MODEL GFM 17
GFM
37, 47, 57, 67, 77
FLOW
RANGE
0-100% 20-100% 0-20%
FLOW
RANGE
0-100% 20-100% 0-20%
ACCURACY
±1.5% ±1.5% ±3%
ACCURACY
±1% ±1%
REF DATA
with ±1%