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6 Field Calibration

Gauge Calibration

To verify the calibration of a gauge, the easiest method is to compare the readings of one channel with

respect to the other channel. If the pressures are equal, then it is likely the gauge is accurate, because

the chance of both channels being out of calibration by the same amount is very small.

To perform a cross port check

1. Set both channels to measure pressure in Pascals.

2. Turn Auto-Zero off

3. Connect the Input port of Channel A to the Input port of Channel B using a small piece of

tubing. The measured pressure on both channels should be within 1% of each other.

4. Disconnect the tubing, and then connect the Reference ports of both channels using the

same piece of tubing. The measured pressure on both channels should be within 1% of each

other.

The same procedure can be followed to compare two gauges. The reading on both gauges

should be the same.

Figure 8. Gauge field check configurations (cross-channel checks (top), cross-gauge checks (bottom)).

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Retrotec DM-2A Manual de usuario Pagina 43