Vehicle vacuum & pressure tester. Low cost sensor usually requires offset (zero) and Gain (span) adjustment.

Precision vacuum and low pressure adjustments require a digital readout. Low cost sensors may have large offset (up to +/- 10%) and span (up to +/- 5%) errors. Sensors are usually able to measure a vacuum as well as pressure.

A +/-30 to +30 psi sensor with a 4 to 20 mA output is easily handled by the DPL-3. Since vacuum is most usually measured in this range, it is advantageous to optimize the calibration for vacuum. The best way is to calibrate the meter to read -30.0 with the sensor at 30 psi of vacuum and to display 00.0 with the sensor exposed to ambient (0 psi gage) pressure. The positive or pressure readings will be within the linearity of the pressure sensor.

The 'PSI' annunciator can also be enabled on the DPL-3 display.

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