Aalborg DFC Digital - Manual (Page 10)

4.1 DFC 26/36/46 Mass Flow Controllers
ACCURACY: +1% 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 10 to 60 psia (0.7 to 4.1 bars).
REPEATABILITY: +0.15% of full scale.
TEMPERATURE COEFFICIENT: 0.1% of full scale/ F
C.
PRESSURE COEFFICIENT: 0.01% of full scale/psi (0.07 bar).
RESPONSE TIME: 1.0 to 2.0 second to within ±2% of set point over 20% to 100%
of full scale.
GAS PRESSURE: 500 psig (34.5 bars) maximum; optimum pressure is 20 psig
(1.4 bars); 25 psig (1.7 bars gauge) for DFC46.
DIFFERENTIAL PRESSURES REQUIRED: 5 to 50 psig (0.35 to 3.34 bars) differential
pressures. Optimum differential pressure is 25 psid (1.7 bars). See Table IV for
pressure drops associated with various models and flow rates.
MAXIMUM PRESSURE DIFFERENTIAL: 50 psid for DFC26/DFC36, 40 psid for
DFC46.
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%.
MAXIMUM INTERNAL LEAK: 0.5% FS.
LEAK INTEGRITY: 1 x 10 -9 sccs He maximum to the outside environment.
ATTITUDE SENSITIVITY: 1% shift for a 90 degree rotation from horizontal to verti-
cal; standard calibration is in horizontal position.
OUTPUT SIGNALS: Linear 0-5 VDC (2000
Ω minimum load impedance); 4-20 mA
optional (50-500
Ω loop resistance); 20 mV peak to peak max noise.
Contact your distributor or Aalborg
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for optional RS232 or IEEE488 interfaces.
COMMAND SIGNAL: 0-5 VDC (200K
Ω input impedance); 4-20 mA optional.
TRANSDUCER INPUT POWER: DFC - +15 +5% VDC, 450 mA max, 6.75 watts max;
-15 +5% VDC, 450 mA max; 6.75 watts max;
Power inputs are each protected by a 500mA M (medium time-lag) resettable
fuse, and an inverse shunt rectifier diode for polarity protection.
WETTED MATERIALS: 316 stainless steel, 416 stainless steel, VITON
7 O-rings;
BUNA-N
7, EPR or KALREZ7 O-rings are optional.
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