Interscan Corporation GF1900, Руководство пользователя

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SULFURYL FLUORIDE MANUAL REV C PAGE 13 OF 23 04/07/11
Furnace is hot, READY light is not on.
Thermocouple may be defective. Check across leads for mV reading. The
reading should be greater than 20 mV after 5 minutes. Reverse thermocouple
leads if the reading is negative.
If thermocouple is okay, R27 may be set incorrectly. With the thermocouple
reading approximately 35 mV, adjust R27 to get a READY indication.
No response to Vikane
. Furnace hot.
Make sure that the
hole in the Sensor inlet fitting is not blocked.
Check that banana plug is connected to the sensor and the clamp is tight.
Check for 550 mV (± 15 mV) on sensor clamp or blue wire to the sensor.
Check that the meter responds to ZERO control.
Connect a rotameter to the inlet and open the valve completely. Check for
approximately 50-100 cc/min flow.
Meter off scale. No response to ZERO control.
Disconnect sensor banana plug and check for ZERO control.
Check output of Q2 for 4.5 to 5.5V.
Check output of U3 for a negative reading 93% or greater of the value at Q2.
Sensor clamp or voltage at blue wire to sensor not at 550 mV (± 15 mV).
Check reference voltage at CR1. This should read between 1.21 and 1.23 V.