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Comment: The following text has been provided for project engineers. The text can be copied from this page and pasted into your word processor for
inclusion in system specifications.
MODEL GPX 220 Engineering Specifications
A gauge pressure transducer shall be provided to sense the system pressure of the ___________________ at the location as shown on the plan drawings and in accordance with the manufacturer's recommendations. The transducer shall be a 4-20 mADC, 2-wire, 12-40 VDC loop-powered type with its output signal directly proportional to the measured level excursion. The transducer shall be UL Listed.
The transducer shall be electrically isolated from the sensed media. The sensor shall provide an output that is directly proportional to the calibrated range. The sensor shall have a brass 1/4" NPT bulkhead fitting for connection to the system's pressure tap. The transmitter shall contain: 1) easily accessible calibration and ranging adjustments allowing for a 10:1 turndown 2) integral level simulation for ranging adjustment and system test purposes 3) an integral, selectable time constant for signal damping of 0.1, 2, and 5 seconds 4) in-circuit calibration circuitry for measuring the transmitter's output without disconnecting from the loop power.
The transmitter shall provide three levels of transient protection on the 4-20 mA loop: a gas tube arrestor for suppression of high voltages, transorbs, and varistors for fast clamping of lower voltage transients. The transducer shall be a CONTEGRA Model GPX 220.