Description
Issue 5 - June 2005 Page 19 of 64 Pages
Options circuit board
The options circuit board provides:
• TWA alarm relay (requires display board V2 to operate)
• 4-20 mA output proportional to gas level
• datalogger output
Fit the options circuit board onto SK6 and SK9 on the main circuit board.
When the options circuit board is fitted, the 4-20 mA output is on terminals 3 and 4 of
the main circuit board and the TWA relay output is on terminals 20 to 22.
The RS-232 datalogger output is on an RJ11 socket with four conductors.
RS-232
data logger
out
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