18
BG 5043 BEN / A (2016-10) PTR225_237.oi
6 Troubleshooting
Problem
Possible cause
Correction
No LED is on.
Supply voltage is missing.
The "POWER" LED (6/1)
is on, the "READY" LED
(6/2) is not on.
High tension has not been ac-
tivated. Pressure has dropped
below < 3·10-
9
mbar.
The gas discharge has not
ignited.
Sensing cell not properly con-
nected to the electronics as-
sembly (e.g. after mainte-
nance).
Missing anode ring (e.g. after
maintenance).
The measurement signal
is always greater than
10 V even if the pressure
is much lower than
10
-2
mbar.
Short circuit in the sensing
cell.
Clean the sensing
cell. For this refer to
section 5.2.
During pumpdown the
measurement signal re-
mains at some level al-
though the pressure is
dropping.
Contamination within the sen-
sing cell.
Replace the sen-
sing cell.
7 Wearing Parts and Original Spare Parts
When ordering spare parts, always indicate:
•
all information on the product nameplate
•
description and ordering number according to the spare parts list
Ordering number
Maintenance set, consisting of:
Cathode plate of titanium (5 pcs.)
Ceramics disc (5 pcs)
Gauge
PT 120 030 -T
Repair set kit, consisting of:
Anode ring with ignition aid
PT 120 031 -T
Replacement sensor (DN 25 KF),
complete with magnet assembly (PR 25)
PT 120 032 -T
Replacement sensor (DN 40 CF-F),
complete with magnet assembly
PT 120 033 -T
