Download EPC-100E OM 5-06

EPC-100E AIR-FUEL CONTROLLER
5.0 MOUNTING THE K-TYPE THERMOCOUPLES
5.1 Exhaust temperature thermocouples are used to monitor the temperature of exhaust gases near the exhaust oxygen sensor and
should be mounted as close as possible to the appropriate O2 sensor. As with the O2 sensor, the location should be easily accessible,
and the tip of the probe, which should be enclosed by a thermowell,
should be surrounded by unobstructed exhaust flow.
5.3 CATALYST PROTECTION THERMOCOUPLES should be installed in the catalyst housing. Provision for thermocouple installation is normally
provided for in the design and manufacture of the catalyst. Installation of the thermocouples on the inlet to the catalyst and the outlet of the catalyst provides three modes of protection: High Inlet
Temp Shutdown, High Outlet Temp Shutdown and High Catalyst
Temperature Rise Shutdown. Consult catalyst manufacturer’s recommendations for required overtemp protection.
5.3 ONLY UNGROUNDED thermocouple probes can be used with the EPC-
100E. Grounded type thermocouples will not function correctly.
Resistance from either lead of the thermocouple to the probe shell
should be 2 megohms or greater.
4 FORM EPC-100E OM 5-06