The Model 3666 Automatic Pressure Calibration (APC) System is a portable secondary standards laboratory capable of generating and controlling test and calibration pressures up to 10,000 psig with an accuracy of ±0.1% of the indicated value (IV) from 5 to 10,000 psig.
Available in four configurations, the Model 3666 APC System is designed for fast, efficient testing and calibration of pressure gauges, vacuum gauges, switches, transmitters, transducers, and other pressure-sensing devices. The test system components are housed in rugged, compact aluminum cases and can be easily transported to the location of instruments requiring calibration, which simplifies service and maintenance procedures.
The 3666-2K-1 APC System operates at pressures up to 2,000 psi, and consists of a control unit, a nitrogen supply cylinder, and an accessory kit containing all equipment required for use and maintenance of the system. The 3666-10K-1, 3666-10K-2, and 3666-10K-3 APC Systems operate at pressures up to 10,000 psi, and include the control unit, nitrogen supply cylinder, accessory kit, and a separate pressure intensifier. A conversion kit enables the 3666-2K-1 APC System to be upgraded to 3666-10K-1 specifications. See below for more information regarding the APC System components.
Operation of the Model 3666 APC System is driven by microprocessor circuitry incorporated in the control unit. An alphanumeric front panel display prompts the operator through the measurement process and performs all necessary calculations, saving time and effort. Precise direct readings can be displayed using the following measurement units: psig, inches of mercury, inches of water, feet of seawater, kilopascals, and kilograms-per-square-centimeter. A handheld remote control module displays measurements and enables operation of the test set up to 10 feet from the control unit.
A convenient thermal printer built into the control unit can be used to generate hard copies of test and calibration data, eliminating time-consuming manual data logging. The control unit also incorporates an IEEE- 488/GPIB interface, permitting automated calibration of the 3666 APC System using the King Nutronics 3689- A Precision Pressure Standard System. Quick-disconnect fittings are used on all pneumatic connections, enabling fast system setup.
The Model 3666 APC control unit contains the electronics that drive the system, all operator controls and interfaces, and a thermal printer.
During operation, the control unit accepts pressurized dry nitrogen from a supply cylinder or pressure intensifier, or vacuum from an external source, and meters precisely controlled pressure or vacuum to the unit under test, as shown in the diagram below. In “normal mode” the control unit electronics permit coarse and fine adjustment of the delivered pressure/vacuum for faster testing. The operator can also specify a tolerance range and pass/fail criteria for the pressure/vacuum delivery. In the “calibration lab” mode, pressure/vacuum is delivered at the exact level specified by the operator.
An easily readable vacuum-fluorescent front panel display provides information such as the target pressure, actual pressure, and pass/fail status for the unit under test. Hard copies of test and calibration results can be quickly generated using the built-in printer.
A self-test of the electronic components is executed each time the 3666 APC control unit is powered-up. If a malfunction is detected, its cause and location is shown on the front panel display, simplifying service.