Retrotec DM32 User Manual download pdf (Page 56)

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7. Verify your gauge accuracy between factory calibrations

Recommended calibration interval for the DM32 series is 5 years. The question is when did the gauge go

out of calibration? Last week or last year?

What is needed is a quick field check to check your gauge regularly and before any important test.

Moreover, gauge calibration, where errors are typically a few %, are not as frequent a cause of problems

when compared to blocked, leaking or pinched tubes that happen more often and can yield errors of 10 to

90%. Sending your gauge in for calibration does not address those problems, but regularly carrying out this

field check will.

Here is how to check the tubes to be sure they are not blocked, pinched or leaking:

Checking each tube for blockage, leaks or pinching and checking gauge calibration should be done weekly.

It only takes a few seconds. Connect one tube between Channel A and B. If the pressure readings

displayed on [Channel A] and [Channel B] match within 2% both that tube and the gauge ports used are OK.

To perform a tubing check

1. Display pressure for [Channel B] (see section 3.3.9)

2. Tap [Settings][Baseline][Clear Baseline] to remove any captured Baseline

3. Tap [Settings][Time Averaging] and choose 5s

4. Connect a tube between Channel A and B on the gauge (e.g. yellow and red pressure tube

ports).

5. Check that the readings are within 2%

6. Repeat with each tube between other ports as shown in Figure 64

7. Connect the yellow tube from the yellow to the red port on the gauge which should be set to

Pressure on Channel B. If the readings are within two percent and don’t drop rapidly, you have

confirmed the yellow tube does not leak, the tube and gauge is not blocked and the gauge has

a 99.9% chance of being accurate. Disconnect the yellow and connect the Blue tube from Blue

to Green to check that tube and the negative side of the gauge. Disconnect the Blue and

connect the Green from the Green port to the Red Port to check that tube and the negative

versus positive calibration of the gauge.

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Retrotec DM32 User Manual Page 56