Weather-Rite UHA100 Installation, Operation & Service Manual - page 48
Manual is about: Tubular Unit and Utility Heaters
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14.3 Troubleshooting for Flame Supervision System
NOTE: Minimum flame probe current 1 µA DC. Typical flame probe current 3-5 µA DC.
To measure flame current, connect a 0 - 50 µA DC meter in series with the flame probe. If the meter
reads negative values, then reverse the test leads.