Tietzsch omegaMegaSafe ISO 1Ex Bedienungsanleitung Seite 25

4.5 Measuring with capacitance
Attention! Measurements with non allowed high
capacitance in Ex-areas are not permitted. The test
procedure must be stopped and the measurement
object has to be discharged. Only after complete
discharge the secure connection may be removed.
 ensure a secure connection with the measure
ment object
 start measurement with 32 V
 Keep pushbutton
measurement result is indicated.
 Release the pushbutton
voltage will be indicated in the upper display.
The flashing Volt-LED warns against charging
voltage of the external capacitance.
Charge voltage indication with external
connected capacitance
Determine the time until the measurement
object is discharged and the display shows„Rdy".
 Determine the connected capacitance in Ex-areas
according to the following table:
Discharging time for 32 V test voltage
terminating resistor: 1 GΩ
Capacitance Discharge time
47 nF
100 nF
200 nF
> 200 nF > 4 s
Measurements with 100 V test voltage
are only permitted, if the safety-related
limit values of the plant allow this and the external
capacitance was checked with 32 V
and does not exceed 100 nF.
Discharging time for 100 V test voltage
terminating resistor: 1 GΩ
Capacitance Discharge time
1 nF < 1 s
47 nF
100 nF
150 nF 10 s
Measurements with 500 V test voltage
are only permitted, if the safety-related
limit values of the plant allow this and no external
capacitance was checked with 100 V
and does not exceed 1 nF.
Discharging time for 500 V test voltage
terminating resistor: 1 GΩ
Capacitance Discharge time
1 nF < 1 s
47 nF
100 nF
200 nF
pressed until a constant
the discharge
Ex-Areas
1 s ok
2 s ok
4 s ok
not allowed
Ex-Areas
ok
4 s ok
7 s ok
not allowed
Ex-Areas
ok
8 s not allowed
15 s not allowed
30 s not allowed
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