TROUBLE SHOOTING
Front dark - no instrument power.
Process display shows CCCC - Open thermcouple. Short terminals 1 and 2. Process display should indicate temperature at back of case. Repair or replace thermocouple.
About Half or Twice Expected Reading - Check position of °C/°F switch. Short 1 and 2 to read room temperature.
About 30% Error - Wrong thermocouple type.
Disconnect couple. "J" units over range above 14OO°F, "K" above 2500°F.
No Heat - No heater power, heater wiring, wrong output module.
Heat Stays On - Welded relay contacts, shorted output module, or shorted power handler.
Process Display Shows OOOO Or Initially Displays Room Temperature Then Counts Down Scale As Process Warns - Check for reversed thermocouple.
Display blinks, entered values change - Caused by electromagnetic interference (EMI). Supress arcing contacts in system to eliminate high voltage spikes, seperate sensor and controller power wiring from "dirty" power lines. Ground heated devices.
Unit Repairs
It is recommended that units requiring service be returned to an authorized service center. When a controller is returned for service, a note stating the problem should accompany the unit.
NOTE: Warranty is void when units are modified by the customer or other
A spare parts list can be supplied upon request if complete model number, serial number and temperature range is supplied.
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