622C MKS Instruments Absolute Pressure Transducer

The MKS Instruments 622C Absolute Pressure Transducer are part of the MKS family of general purpose pressure transducers designed to provide accurate, reliable, and repeatable pressure measurements in the range from 1000 Torr to as low as 0.10 Torr F.S. (626C only). These instruments are RoHS (Restriction of Hazardous Substances)-compliant, operate with +15 VDC (+5%) input voltage @ 35 mA or 75 mA, and provide a 0 - 10 VDC analog output linear with pressure. All of these products expose only Inconel® and Incoloy® to the process, permitting use with corrosive or dirty gases and eliminating contamination of the process with transducer materials. Measurements are independent of gas composition and all of the units have a minimum measuring range of four decades.

Using the latest single-sided, dual-electrode Inconel transducer design, coupled with a low impedance, fixed-frequency bridge signal conditioner, these instruments are capable of withstanding high overpressure conditions (45 psia) with minimal or no shifts in output over their range. The advanced bridge signal conditioning technology provides high accuracy and operation which is extremely temperature-stable at operating pressure.

Protection from RF interference and noisy electrical environments is increased by the use of a metal case, by internal design elements, and by the use of surge and ESD suppression networks and RFI filtering on all inputs and outputs.

The Types 622C and 626C transducers have an accuracy of 0.25% of reading, with the exception of the 626C in its 0.10 and 0.25 Torr ranges, which has an accuracy of 0.50% of reading. Type 626C products with ranges of 10 to 1000 Torr may also be ordered with an optional accuracy of 0.15% of reading. The 622C and 626C models are identical except for their electrical connectors; the 622C unit has a 5-post terminal block connector, and the 626C unit has a 15-pin Dsubminiature connector. These instruments have been developed for applications requiring a small, economical transducer, which delivers accurate and repeatable measurements with a resolution of 1 x 10-4 F.S.