The model 3689-A Precision Pressure Standard system is based on a digital pressure transfer standard that is unmatched in the industry for its accuracy: ± 0.025% IV (Indicated Value). Auto-ranging circuitry enables step-less readings from vacuum to 10,000 psi without input from the operator, preventing damage to the instrument due to the over-pressurization of the transducers. The Model 3689-A Precision Pressure Standard displays direct reading measurements using a wide range of units, including psi, in-Hg, kPa, bar, in-H20, and ft./seawater. Three measurement modes are available: absolute mode, gauge mode, and vacuum mode.
The Model 3689-A Precision Pressure Standard System is ideal for the calibration of dial pressure gauges and digital pressure measurement devices. The system is also used to calibrate the KNC Model 3666 Automatic Pressure Calibration System. A microprocessor control and front panel display prompts the operator through the calibration and standardization process and performs the necessary calculations, saving time and effort. An integral IEEE-488/GPIB interface enables automated calibration and standardization of the KNC Model 3666 system and can be used to transmit data to a remote computer. A built-in printer conveniently generates permanent records of measurement data. The pressure standard system also includes a liquid trap, a kit containing 12 male and female quick-disconnect adapters from 1/8 to 1/2-inch diameter, a MIL-I-18997C adapter, and a packing kit containing back-up rings, seals and other supplies necessary for field maintenance of the pressure standard and liquid trap.