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Model 199 Differential Pressure Unit

Brand: Cameron

The 199 is designed to measure differential pressures under the most severe operating conditions.

The unit incorporates Barton’s® rupture-proof bellows. Ease of installation, stable calibration, and minimal maintenance are inherent qualities of the M199 DPU.

The 199 is composed of a Bellows Unit Assembly (BUA) and a pair of pressure housings that enclose opposite sides of the BUA.

The BUA consists of a pair of bellows, centerplate, overrange valves, temperature compensator, torque tube assembly, dampener valve, and range spring assembly.

Temperature Compensator: An auxiliary free-floating bellows, attached to HP bellows, automatically protects unit from zero/calibration drift caused by ambient temperature changes.
Pulsation Dampener: Internal dampening is accomplished by restricting the flow of liquid through its normal channel (the annular passage in the centerplate) and causing it to follow an alternate route controlled by an adjustable needle valve. Response time for the unit depends upon the range and fill liquid, but is typically adjustable between a few seconds and several minutes for full scale travel of the bellows.
Mounting: The M199 is supplied with a 2-in. pipe-mount bracket. The bracket is provided with four 1/2-20 U.N.C.-2B holes for use in attaching the DPU to the instrument being actuated. The unit can also be wall mounted.