Design and Construction
The Series 6512000 Portable Pneumatic Calibrator is a pressure-vacuum test stand wholly contained in a carrying case. The front panel accommodates the precision pressure gauge, all pressure connections, two air-regulator controls, and a selector valve. With the selector valve, three different test pressures can be applied individually to the gauge. A fourth selector setting vents the gauge to atmosphere.
The precision pressure gauge has a Ni-Span C, capsule-type pressure element which gives excellent temperature stability and speed of response. An almost frictionless mechanical linkage amplifies capsule movement and transmits it to the pointer. Although highly sensitive and accurate, the mechanism is built to withstand the handling normally associated with on-site calibration of pneumatic instrumentation.
A filter on the air supply keeps oil and moisture out. Two regulators apply known pressures to the devices under test. The connection block has 1¼8 inch female-pipe threaded connections. Small gauges can be threaded directly into the block; or as with larger instruments, connected by flexible tubing.
The scale contains two sets of calibrations: -100 to 0 to 850 inches of water and -3.6 to 0 to 30.6 psi.
Clear, Accurate Readout
Sharply defined graduations, a 45-inch scale length over two pointer revolutions, and a knife edge pointer to facilitate precise readouts. All scale calibrations are individually plotted and hand marked to produce a dial custom fitted to the pressure element and mechanism of that gauge.
Engineered for Performance
The gauge housing is heavy cast aluminum with a tempered glass dial cover. A built-in pressure-relief valve has a dumping capacity which protects the case against overpressure to 10 times the maximum pressure rating. A separate pressure-relief valve protects the capsule mechanism. The gauge is mounted inside the carrying case on rubber-padded shock mounts. The carrying case is constructed of strong but lightweight molded ABS that flexes to absorb shock from impact.
The Portable Pneumatic Calibrator weighs only 20 lbs. and is only slightly larger than an attache case. The easy portability, simple set-up and the versatile capabilities of this unit extends its usefulness for service in the field. Its portability saves the time and expense of shop calibration.
An Extra Measure of Accuracy
All Portable Pneumatic Calibrators are subjected to rigorous and extensive testing. Each has to perform at better than the rated accuracy (0.1% of full scale) to be accepted. It’s accurate enough to double as a shop standard.
Calibration Traceable to NIST
Calibration is with primary standards which are directly traceable to the National Institute of Standards and Technology.
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