HONEYWELL MODEL 700/800 SIGNAL PROCESSOR AND VIEWING HEAD
35 66-2069—02
700AC or 700DC Signal Processor Proof Test Procedure

Equipment

• Powered 700AC or 700DC correctly connected to a
compatible viewing head.
• Multimeter able to take voltage and resistance
measurements.
• For 700AC signal processors, an 85V AC to 265V AC
power source.
• For 700DC signal processors, a 22V DC to 26V DC power
supply.
• Light source* capable of generating a flame on condition.
* Generally an incandescent bulb will work for IR viewing head
sensors and a deep UV light or flame will work for UV viewing
head sensors

Setup

1. Ensure the 700AC or 700DC signal processor under
test is correctly connected to a compatible viewing head
and is fully operational.
2. While performing the proof test, disconnect or disregard
the signal processor outputs so that any outputs due to
testing do not affect the overall safety system and
potentially cause a hazardous situation.
3. Record all previously entered user programmable
settings so that you can restore them to their desired
values after the proof test.

Tests

1. Remove power to the signal processor and, using a
multimeter, ensure continuity between ‘SC COM’ and
‘SC OFF’.
2. Reapply power to the signal processor and, using a
multimeter, ensure continuity between ‘SC COM’ and
‘SC ON’.
3. Use a light source to generate a flame on condition and,
using a multimeter, ensure continuity between ‘RF A
COM’ and ‘RF A ON’, and between ‘RF B COM’ and ‘RF
B ON’.
4. Remove any light source to generate a flame off
condition and, using a multimeter, ensure continuity
between ‘RF A COM’ and ‘RF A OFF’, and between ‘RF
B COM’ and ‘RF B OFF’, after the FFRT (Flame Failure
Response Time) has elapsed.
5. Measure the current draw of the signal processor with
its viewing head attached and ensure it is less than
0.07A RMS for 700AC signal processors and 250mA for
700DC signal processors.
6. Measure the DC voltage between ground ‘VH GND’ and
‘VH +V’ going to the viewing head. Ensure it is between
20 and 26 V DC.
7. Change one of the settings of the signal processor and
store the changed setting. Remove power to the signal
processor for 10 seconds. Restore power to the signal
processor and ensure the stored value has remained
unchanged.
8. Use your light source to generate flamecounts of
between 12 and 22 on the signal processor. Note the
flamecount.
a. Increase the gain and store the setting. Ensure the
flamecount increased.
b. Decrease the gain and store the setting. Ensure the
flamecount decreased.
9. Restore all original settings as recorded in Setup and
reconnect the signal processor to the safety system.
Product Decommissioning
When required, decommissioning of the 700 should be
performed in accordance with requirements of the overall
safety system.