Panametrics CGA 351, User Manual, Page: 76 / 119

Chapter 5.
70 CGA 351 User’s Manual
5.1.2.1 Checking the Wiring
Complete the two checks listed below to correct any wiring problems.
WARNING!
Be careful when tightening the terminal block electrical connections. Full line voltage is present on
some terminals.
IMPORTANT: These symbols indicate Caution - dangerously hot surfaces and risk of electric shock, respectively:
1. Open the cover on the sensor enclosure and remove the lower front panel from the electronics enclosure.
Note: For information regarding component locations and/or wiring connections in an optional enclosure, see
Appendix C.
2. Check all wiring, including that performed at the factory. Refer to the wiring instructions in Chapter 2,
Installation,
and the wiring diagram in Figure 6 on page 14, to make sure that all wires are attached to the correct pins. If any
connections are loose, turn the screws clockwise with a small screwdriver to secure the connections.
3. Locate the oxygen sensor clips (see Figure 5 on page 87) and short them together with a jumper. The oxygen
display should read 20.93%.
Note: Due to an uncorrected offset in some units, an exact reading of 20.93% may not be obtained. However, the
result should be close to this value.
4. If the wiring is good and a 20.93% oxygen reading is obtained with the shorted clips, remove the jumper , and
proceed to the next section.
Note: If an open loop (OL) is measured at the oxygen sensor clips, recheck the wiring and try again. If the OL
reading repeats, contact the factory for assistance.
Note: A cold sensor will always indicate an open loop (OL).