640B Absolute Pressure Controller

10, 100, 1000 mmHg (Torr), 60, 100 psi (Full Scale)

4 VCR, 8 VCR, 0.25 in. Tube, or Surface Mount

50, 200, 1000, 5000, 10000, 20000, 50000 sccm (nominal Full Scale flow rates for N2 with 15 psig on inlet and atmosphere on outlet)

Two open-collector transistors
Rated: 250 mA @ 30 VDC
Adjustable: 1 to 100% of Full Scale
Hysteresis: 3% of Full Scale
Indicators: Green LED's on when actuated

±0.2% of Full Scale

45 psia or 2x Full Scale, whichever is greater

30 psi for 20,000 and 50,000 sccm orifices
150 psi for 50 to 10,000 sccm orifices
(consistent with transducer overpressure limit)

Downstream standard; Upstream optional

±0.5% of Reading (includes linearity, hysteresis, and repeatability)

Zero: ±0.02% of Full Scale/°C

Span: ±0.04% of Reading/°C

>2 to 100% of Full Scale

<1.0 sec (excluding system time constant)

0 - 50°C (32° to 122°F)

-20 to 80°C (-4° to 176°F)

<10^-9 scc/sec He

Elastomer valve: <10^-4 scc/sec He
Metal valve: <1% of Full Scale (N2 @ 1 atm. ΔP)
Kel-F valve: <0.5% of Full Scale (N2 @ 1 atm. ΔP)
(through closed valve)*

Standard: 316L S.S., 316L/VAR S.S., Inconel, Nickel
Optional: Viton®, Kalrez®, Kel-F®

±15 VDC ±5%, 200 mA maximum

15-pin male type "D"

<100 msec

SAMA 33.1, 1-abc: <0.2% of Full Scale

0-5 VDC standard; 0-10 VDC optional

100 feet (30 m) maximum

2.54 lbs. (1.15 kg)

1.5 inches (38.1 mm) x 4.88 inches (124 mm) (4 VCR) x 5.50 inches (140 mm) maximum

CE