Retrotec DM-2A Instrukcja Użytkownika Pobierz pdf (Strona 44)

Page 44 of 66

©Retrotec Inc. 2012

When performing a gauge calibration with two gauges, if one gauge is known to be calibrated

accurately, it can be used as a reference for the second gauge. In that case, the measured

pressure on the tested gauge should be within 1% of the measured pressure on the calibrated

gauge.

To perform a T-connection Fan Pressure check

1. Using a T-connection, connect a pressure tube to the Input port of

both Channel A and B.

2. Create a Fan Pressure on the end of the pressure tube.

3. Both Channel A and B should display the same measured pressure

(or within 1%).

A similar procedure can be performed, by using a syringe to create a Fan

Pressure. This can be done with either one or multiple gauges.

Although the procedure with a syringe is fairly widely used, it is not

recommended by Retrotec for the following reasons:

 Requires equipment that most people don’t have (Magnehelic gauge).

 Requires specific syringes (50 and 500 cc).

 It's an awkward procedure.

 Some part of the testing system of tubes and syringe will invariably be leaky and produce

inaccurate results.

To perform a syringe check

1. Connect two gauges and a syringe following the set up in Figure 5-1.

2. Connect a Magnehelic gauge as shown.

3. Slowly pull air out of the syringe. Pressure readings on both gauges should increase.

4. Both gauges should display the same measured pressure.

5. Repeat steps 1 - 3 on the Input and Reference ports of both gauges.

Figure 10. Syringe check setup

Figure 9. Fan Pressure check

using a T-connection check.

1 2 ... 39 40 41 42 43 44 45 46 47 48 49 ... 65 66

Brak uwag

Retrotec DM-2A Instrukcja Użytkownika Strona 44