Edwards PGC201, Instruction Manual

Page: 34 / 68

D0300040001EN - Operation
Page 24
Parameter mode selection

Press the pushbutton (PARA) and keep it depressed for approximately 2 seconds.

The instrument will change to the parameter mode (see Parameter mode ).

If no pushbuttons are pressed within 10 seconds, the instrument will then
automatically return to the measurement mode.
Switching the CPG on
The CPG gauge head can be switched on manually. For this, sensor control must be set to

(see Sensor switch-on type (S-on) ).

Press the pushbutton (CH) to select measurement channel 3.

Keep the key marked (UP) pressed for approximately two seconds.

The CPG gauge head at measurement channel 3 is switched on. Either the
measured value or a status message will be displayed ( Table 10 ).
Switching the CPG off
The CPG gauge head can be switched off manually. For this, sensor control must be set to

(see Sensor switch-off type (S-off) ).

Press the pushbutton (CH) so as to select measurement channel 3.

Keep the key marked (DOWN) pressed for approximately two seconds.

The CPG gauge head at measurement channel 3 is switched off. The display will
indicate the status

.
PRG adjustment
Ageing and contamination of the sensor filament will impair the accuracy of the pressure
readout. For this it is recommended that the PRG gauge head is adjusted as required. For this,
the gauge head must be orientated in the same way in which it is subsequently operated. The
adjustment process is performed as follows:

Vent the vacuum system and adjust the 100% potentiometer on the PRG gauge head
so that the following readout is obtained:
Figure 11 Full-scale adjustment for the PRG gauge head
Adjustment too high
Adjustment is correct
Adjustment is too low