Edwards AIM-P-NW25 User Manual

D14643880 Issue L
Page 12 © Edwards Limited 2020. All rights reserved.
Operation
4.1 Reading the pressure
The Active Inverted Magnetron gauge has a 2 to 10 V d.c. analogue output signal which is a function of pressure. To
find the pressure, the output voltage is measured (between pins 3 and 5 on the connector) using a standard voltmeter
and compared to the calibration table shown in Table 1.
4.2 Error monitoring
The Active Inverted Magnetron gauge has an error monitoring feature which checks the gauge output signal such that
the set-point is turned off when any of the following conditions are true:
a. A short delay (0.5 seconds) during gauge power up.
b. When the gauge signal is out of range, that is, <1.8 V, possibly because the gauge has failed to strike.
Table 1 - Calibration table for dry air and nitrogen
Pressure mbar Output voltage Pressure torr
1.0 x 10
-8
2.00 7.5 x 10
-9
2.4 x 10
-8
2.50 1.8 x 10
-8
5.8 x 10
-8
3.00 4.4 x 10
-8
8.1 x 10
-8
3.20 6.1 x 10
-8
1.1 x 10
-7
3.40 8.3 x 10
-8
1.5 x 10
-7
3.60 1.1 x 10
-7
2.1 x 10
-7
3.80 1.6 x 10
-7
2.9 x 10
-7
4.00 2.2 x 10
-7
4.0 x 10
-7
4.20 3.0 x 10
-7
5.4 x 10
-7
4.40 4.1 x 10
-7
7.3 x 10
-7
4.60 5.5 x 10
-7
9.8 x 10
-7
4.80 7.4 x 10
-7
1.3 x 10
-6
5.00 9.8 x 10
-7
1.7 x 10
-6
5.20 1.3 x 10
-6
2.2 x 10
-6
5.40 1.7 x 10
-6
2.8 x 10
-6
5.60 2.1 x 10
-6
3.6 x 10
-6
5.80 2.7 x 10
-6
4.5 x 10
-6
6.00 3.4 x 10
-6
5.6 x 10
-6
6.20 4.2 x 10
-6
6.9 x 10
-6
6.40 5.2 x 10
-6
8.4 x 10
-6
6.60 6.3 x 10
-6
1.0 x 10
-5
6.80 7.5 x 10
-6
1.2 x 10
-5
7.00 9.0 x 10
-6
1.4 x 10
-5
7.20 1.1 x 10
-5
1.7 x 10
-5
7.40 1.3 x 10
-5
2.0 x 10
-5
7.60 1.5 x 10
-5
2.4 x 10
-5
7.80 1.8 x 10
-5
2.9 x 10
-5
8.00 2.2 x 10
-5
3.5 x 10
-5
8.20 2.6 x 10
-5

Edwards AIM-P-NW25 Specifications

General

Brand	Edwards
Model	AIM-P-NW25
Category	Industrial Equipment
Language	English