Ametek Thermox 2000 ATEX Series User Manual page 138

the control unit power supply/keypad module. If this fuse is not OK, re-
place the fuse (1/4 amp, 125 volts, IEC speed type FF). Check the intercon-
necting wiring for short circuits before applying power to the control unit.
If you do measure 15 volts at terminals 2 (-) and 12 (+) of the sensor board,
measure across terminals D (+) and 6 (-) on the sensor board. Twelve mil-
livolts should be measured (this signal is a function of ambient tempera-
ture and may vary up to 2 millivolts at extreme ambient temperatures). If
you don't measure this voltage, replace the sensor board.
For a furnace temperature set point for a 615°C oxygen cell temperature,
the furnace thermocouple output would be about 27 mVs (take memory
location 88 which is the T/C Ratio calculated during the primary - thermal
calibration and divide the cell temperature by this value to come up with
the furnace temperature set point).
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