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7.6.4
Electrical Connection
7.6.4.1
Power Supply
7.6.4.2
Connecting to a Tan Delta OQDe
NOTE: The OQDe is not EX certified so must be mounted outside the Hazardous Area.
Connect the OQSExISG2 to the left-hand connector of the OQDe. This will require a Tan Delta
OQDe Cable ExSD (various length versions available) and suitable EX Zener barrier, which must
be earthed to the Equipotential bonding system. Connect the Sensor cable RS485 wires (green,
brown and black) via an EX certified Junction Box to a suitable EX isolating or Zener barrier.
Connect the safe-area Zener barrier pins to the OQDe Cable ExSD (see OQDe section of this
manual for wiring colours). Align and slot in the 6-pin connector to the OQDe and then tighten
the connector screw-cap. Please refer to the OQDe section of this manual for further information
about OQDe setup and configuration.
7.6.4.3
Data output
You can use the output from yellow and orange wires to provide analog indication of the oil
temperature and condition on other, third party, data acquisition and control systems.
7.6.4.4
Using the Oil Condition analog output
Oil condition is output on the orange wire as a Loss Factor Percentage and is linearly scaled from
-20% (4mA) to 60% (20mA). Loss Factor Percentage can easily be converted to the TDN scale using
the table on page 124. A clean oil should provide an output of about 8mA. For most applications,
we recommend setting a warning alert for a value of 13mA and an alarm notification for values
over 14mA. Any value below 4mA indicates a fault. This output must be connected via a suitable
isolating or Zener barrier if the monitoring equipment is mounted in the safe area.
7.6.4.5
Using the Oil Temperature analog output
The analog output on the yellow wire provides a linearly scaled measure of Oil Temperature in
°C between -30°C (4mA) and +130°C (20mA)
–
(See Appendix
–
Section 14). This output must be
connected via a suitable isolating or Zener barrier if the monitoring equipment is mounted in the
safe area.
Figure 17 - Wiring Diagram for Power Supply & Data Output (Inc 4-20mA)
Summary of Contents for OQSExISG2
Page 1: ...UG OQSxG2 23 0025 OIL QUALITY SENSOR ASSOCIATED ACCESSORIES USER GUIDE...
Page 2: ......
Page 5: ...Page 3 Page Intentionally Blank...
Page 37: ...Page 35 Figure 19 Connection to other Tan Delta and 3rd Party Products Interfaces...
Page 38: ...Page 36 Figure 20 ExOQSxG2 Ex Sensor Installation Drawing Rev 2 STAMPED...
Page 42: ...Page 40 8 Display Express...
