Granville-Phillips Micro-Ion 354 E Series, Instruction Manual, Page: 20 / 54

Chapter 4
20
Micro-Ion E Module Instruction Manual 354011, Rev. A
4.4 Turn the Micro-Ion E
Gauge ON or OFF
The Micro-Ion E gauge measures vacuum pressure for N
2
or air within the
ranges listed in Table 4-1. As pressure decreases to 5 x 10 –3 Torr
(6.66 x 10 –1 Pa, 6.66 x 10 –3 mbar), you must turn the Micro-Ion E gauge ON
to enable pressure readings. In some instances, you might need to turn the
Micro-Ion E gauge OFF.
To turn the Micro-Ion E gauge OFF and ON, install a switch between pins
2 (24 Vdc power ground) and 1 (gauge ON/OFF) on the 9-pin connector, as
illustrated in Figure 4-1.
• Close the switch to turn the gauge ON.
• Open the switch to turn the gauge OFF.
Figure 4-1 Pins 1 and 2: Switch for Micro-Ion E Gauge ON/OFF
Table 4-1 Micro-Ion E Gauge Pressure Measurement Range
Low pressure limit (N
2
or air) High pressure limit (N
2
or air)
5 x 10
–7
Torr 5 x 10
–3
Torr
6.66 x 10
–5
Pa 6.66 x 10
–1
Pa
6.66 x 10
–7
mbar 6.66 x 10
–3
mbar
Power ground –
Gauge ON/OFF +
Switch
See Table 2-1 and Table 2-2 for
pin designations and functions.