Edwards Barocel 7025, Инструкция по эксплуатации

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Page 18
W602100880_A - Operation
The output signal is dependent on the mounting orientation. The signal difference between
the vertical and horizontal mounting orientation is:
Note:
If the gauge is operated through a controller, the zero of the whole measurement system has
to be adjusted on the controller. Adjust the zero on the gauge first and then on the controller.
<ZERO> Adjustment
The zero can be adjusted by:

The <ZERO> button on the gauge

The RS232C interface, see Operation on page 17

An Edwards vacuum gauge controller.
To adjust the zero:
1. Evacuate the gauge to a pressure according to the table below:
Note:
If the final pressure in the gauge is too high for zero adjustment (> 25% of the F.S.), the zero
cannot be reached and the <RUN> LED flashes. If this happens, start the factory setting and
adjust the zero again.
2. Operate the gauge for a minimum of 2 hours (until the signal is stable).
3. Briefly press the <ZERO> button with a pin (maximum ø1.1 mm). The zero
adjustment runs automatically. The <STATUS> LED flashes until the adjustment
(duration  8 seconds) is completed.
F.S.  U/90°
1000 Torr/mbar Approximately 2.0 mV
100 Torr/mbar Approximately 10.0 mV
10 Torr/mbar Approximately 50.0 mV
1 Torr/mbar Approximately 300.0 mV
0.1 Torr/mbar Approximately 1.8 V
F.S. Recommended final pressure for zero adjustment
1100 mbar - < 7 × 10
0
Pa < 7 × 10
-2
mbar
1000 Torr < 5 × 10
-2
Torr < 7 × 10
0
Pa -
100 Torr/mbar < 5 × 10
-3
Torr < 7 × 10
-1
Pa < 7 × 10
-3
mbar
10 Torr/mbar < 5 × 10
-4
Torr < 7 × 10
-2
Pa < 7 × 10
-4
mbar
1 Torr/mbar < 5 × 10
-5
Torr < 7 × 10
-3
Pa < 7 × 10
-5
mbar
0.1 Torr/mbar < 5 × 10
-6
Torr < 7 × 10
-4
Pa < 7 × 10
-6
mbar