User Manual - P series
16
www.georgin.com
5.
Type B adjustment : adjustable dead band instrument
VG:
RG:
IG:
IE :
RE:
VE:
ES:
LP:
LE:
C:
Range adjustment screw
Range spring
Range index
Dead band and offset index
Dead band adjustment and offset spring
Dead band adjustment and offset screw
Sensing element
Flexible arm
Dead band arm
Switch
5.1. Procedure B1: Single instrument
Example: 2 mbar falling and 6 mbar rising.
5.1.1. Setting the lower threshold
1. Inhibit the dead band spring (RE) by fully loosening the knob (ME).
2. Raise the pressure to the lower threshold (2 mbar) and stabilise it.
3. Using set point adjustment screw VG, relax range spring RG until switch(es) C changes state.
4. Retighten and stop at the exact point where switch(es) C is/are interlocked on the way down.
5.1.2. Setting the upper threshold
5. Keep the pressure stable at 2 mbar.
6. Fully extend spring RE.
7. Raise the pressure to the upper threshold (6 mbar) and stabilise it.
8. Using dead band adjustment screw VE, relax dead band spring RE until the exact point when switch(es) C
is/are triggered on the way up.
5.1.3. Checking/Adjusting the set points
9. Slowly raise the pressure, and then slowly lower it again. Measure the lower and upper triggering thresholds.
10. Fine-tune the settings using screws VG (Low threshold control) and VE (High threshold control).
11. Disconnect the instrument from the bench.
12. Apply a seal to adjustment screws VG and VE using a Georgin seal kit (torque: 1.7 N∙m ±10%).
13. Close the cover and tighten the two captive screws (torque: 1.2 N∙m).
