Spectrex 20/20SH - Hydrogen Flame Detector - Manual (Page 23)

Spectrex Inc. - SharpEye TM Hydrogen (SH) Flame Detector Manual – TM 784600, Rev. A, May 2005
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D. Automatic & Manual BIT
Manual Bit
Functions as described in Paragraph 4.4.C. In the case of an unsuccessful BIT all
outputs will function as described in Paragraph. 4.4.C, but the BIT will be
automatically executed every 1-minute. This mode of operation will continue until
successful Bit has been encountered. As a result, the detector will resume its
normal operation.
Automatic BIT
The detector automatically performs a BIT every 60 minutes.
A successful BIT sequence does not activate any indication:
The FAULT relay is CLOSED (NORMAL).
The POWER LED is ON (NORMAL).
The 4-20mA Output Indicate NORMAL (5mA).
An unsuccessful BIT sequence activates the following:
The FAULT relay is opened.
4-20mA output indicate BIT FAULT (2mA).
The POWER LED (yellow) flashes (4 Hz).
BIT procedure
will be performed every 1 minute.