Specifications

Full Scale Ranges

10 Torr through 500 psi (Consult Applications Engineering on Full Scale ranges

in other engineering units. Selection of trip point and Full Scale range should be

as close as possible as trip point accuracy is affected by the Full Scale range)

Trip Point Range

5% to 100% of F.S.

Accuracy

±0.5% of F.S. (±temperature coefficient)

Temperature Coefficient*

±0.07% of F.S./°C

Ambient Operating Temperature

0° to 50°C

Trip Point Dead Band

±3% of F.S.(nominal)

Response Time

<20 msec

Materials Exposed to Process Gases

Inconel and 316L S.S.

Internal Volume

3.3 cc for single-ended, 6.6 cc for flow-through

Overpressure

2 × F.S. or 45 psia, whichever is greater

Outputs

Electromechanical relay

SPDT (isolated) contacts rated up to 1 Amp @ 30 VDC resistive. Relay is

energized either with increasing pressure or decreasing pressure.

Input Power Required

10 to 20 VDC @ 35 mA max. or 20 to 30 VDC @ 30 mA max.

Fittings

42B/52B

41B/51B

Compliance

CE

*Example: A 100 Torr sensor with a 2°C change has a trip point temperature-induced error less than or equal to:

(0.0007 x 100 Torr x 2) = 0.14 Torr error anywhere within the trip point range

Note: Atmospheric switches provide a means by which the trip set point is referenced to current atmospheric conditions. “Reverse

Calibration” allows the trip point to be set at or below the current atmospheric pressure. When ordering, a value of 000 in the last three

digits of the model code would equate to atmospheric pressure. A value of 002 would equate to 2 Torr or 2 PSIG below atmospheric

pressure, depending on the use of the “D” or “C” ordering code for Full Scale range.

This method provides an excellent mechanism to achieve switching at current atmospheric conditions, regardless of the location of the

installed base or present weather conditions.