Primary Standard For Pressure Testing

The PK II is a ball-type pneumatic tester which produces a pressure by applying force using a set of weights over a virtually frictionless ceramic ball floating on a layer of air within a stainless steel cylinder. It is NIST traceable and accurate to ±0.015% using stainless steel weights calibrated to International standard gravity at 9.80665 m/s2. Local gravity calibration is also available. Small incremental weight sets are available to provide fractional output pressures.

The PK II tester operates in the range 1 to 200 kPa (0.145 to 30 ps) with a precision (repeatability) of + 0.005% of the indicated reading. The instrument’s built-in flow regulator automatically adjusts the input air flow to maintain the ball and weights in a float position. The regulator also compensates for variations in pressure from the air supply, thus removing the need to adjust the supply during the test and providing an easy up and down scale calibration.

The instrument uses nitrogen or instrument quality air which is non-contaminating to virtually all processes, thus eliminating the need to clean instruments after calibration and before use.

The rugged construction of the PK II makes it suitable for field as well as laboratory work. A 3-leg leveling system and bulls-eye level reference allow easy set- up and the unit can be mounted on a tripod if required. The tester has been designed to operate with the cover closed to eliminate wind effects during field operation.