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22
7 Diagnostics and servicing
VEGACAP 35 • Relay (DPDT)
33759-EN-230510
6
7
4
3
CPH
CM
1 M
Ω
2 M
Ω
1 M
Ω
3
2
1
Fig. 9: Check the resistance in the probe
1 Contact 1 (middle pin)
2 Variable capacitor (phase)
3 Capacitor
Measure the resistance values between the following contacts with an
ohmmeter (range MΩ).
Contact 4 against contact 1 (middle pin)
The resistor must be 1 MΩ.
If the resistor is lower, this means moisture in the housing or a fault in
the electrode insulation. A possible reason could be also a non-insu-
lated electrode which is used in a conductive (humid) medium.
If the resistor is higher or if the connection is interrupted, the reason is
mostly a contact error in the adapter plate or a defective resistor due
to strong electrostatic arking.
In both cases, the probe must be repaired in our premises.
Contact 4 against vessel
The electrical connection between contact 4 and metal vessel (not
the mounting boss or probe flange) should good. Measure the resist
-
ance value between contact 4 and vessel with an ohmmeter (range
very small).
•
Shortcircuit (0 … 3 Ω) - optimum connection
•
Resistor > 3 Ω - bad connection
Содержание VEGACAP 35
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Страница 35: ...35 Notes VEGACAP 35 Relay DPDT 33759 EN 230510...