Spectrex SharpEye 20/20U, User And Maintenance Manual

Page: 23 / 57

Spectrex Inc. - SharpEye™ UV Flame Detector Manual – TM 20/20UB Rev. E, August 2004
15
d. Automatic & Manual BIT (only when SW1-2 = ON):
Manual BIT:
Functions as described in section 4.5.c.
In the case of an unsuccessful BIT, all outputs will function as described in
section. 4.5.c., however, automatic BIT will be automatically executed every 1
minute.
This mode of operation continues until successful BIT have been encountered.
As such result, the detector resumes its normal operation.
The Manual BIT performance initiates the DIPswitches configuration reading of
the detector. This function is performed at any switch configuration even if
manual BIT is disabled. This initiation is also performed at the 20/20U model,
even though BIT does not exist.
Automatic BIT:
The detector automatically performs a BIT every 60 minutes.
A successful BIT does not activate any indication and the detector indicates
normal as follows:
•
The Fault Relay contacts are closed.
•
The yellow LED blinks at 0.5Hz rate.
An unsuccessful BIT sequence the detector turns to Fault and activates the
indications as follows:
•
The Fault Relay contacts are opened.
•
4-20mA output indicates Fault (2mA).
•
The yellow LED blinks at 2Hz rate.
BIT procedure is performed every one minute.