INFICON BPG402-Sx ATM to Ultra-High Vacuum Gauge - Manual (Page 43)

tina46e1-a (2010-03) BPG402.om
43
Problem Possible cause Correction
Output signal
permanently
≈0V
Sensor cable defective or
not correctly connected Check the sensor cable
No supply voltage Turn on the power supply
Gauge in an undefined
status Turn the gauge off and on
again (reset)
Output signal
≈+0.1 V
(Display: "FAIL EL")
EEPROM failure Turn the gauge off and on
again after 5 s
Replace the electronics
unit
Output signal ≈+0.3 V
(Display: "FAIL Ion")
Hot cathode error
(sensor defective)
→ also 28, filament
status Replace the sensor
(
→ 44)
1)
Output signal
≈+0.5 V
(Display: "FAIL Pir")
Pirani error
(sensor defective) Replace the sensor
(
→ 44)
Electronics unit not
mounted correctly on
sensor Check the connections
(Electronics — sensor)
Corrupted or no signal
Display: "no Signal" Internal data connection
not working Turn the gauge off and on
again after 5 s
Replace the electronics
unit
1)
Pressing the button on the side of the gauge will reset the filament status (only
in the hot cathode range). Subsequently the gauge will test the filaments again
(test time
≈8 sec. / filament). If the error still exists, the gauge will immediately
return into the error state.
If the cause of a fault is suspected to be in the sensor, the following checks can be
made with an ohmmeter (the vacuum system need not be vented for this purpose).
Separate the sensor from the electronics unit (
→ 14). Using an ohmmeter, make
the following measurements on the contact pins.
All unmarked pins in the diagram are used by the sensor electronics and
cannot be utilized for diagnostic purposes (do not connect an ohmme-
ter / continuity checker to these pins).
Ohmmeter measure-
ment between pins
Possible cause
2 + 4 ≈37 Ω >>37 Ω Pirani element 1 broken
4 + 5 ≈37 Ω >>37 Ω Pirani element 2 broken
6 + 7 ≈0.15 Ω >>0.15 Ω Filament 1 of hot cathode broken 1)
7 + 8 ≈0.15 Ω >>0.15 Ω Filament 2 of hot cathode broken 1)
4 + 1 ∞ <<∞ Electrode - short circuit to ground
6/7/8 + 1 ∞ << ∞ Electrode - short circuit to ground
3 + 1 ∞ << ∞ Electrode - short circuit to ground
9 + 1 ∞ << ∞ Electrode - short circuit to ground
6/7/8 + 3 ∞ << ∞ Short circuit between electrodes
9 + 3 ∞ << ∞ Short circuit between electrodes
1) → also "Filament Status", 28).
Troubleshooting (sensor)