Configuration and calibration
Issue 5 - June 2005 Page 40 of 64 Pages
NOTE
Regard-1 4-20:
The alarm relays must be set latching when using transmitters with an
output current which can fall below 20 mA for concentrations above full
scale.
Regard-1 SE Ex:
As a minimum, the relay of the main alarm (highest alarm threshold
value) must be set latching.
The A2 alarm can also be set to be acknowledgeable. You can use the A2 relay to
control an audible alarm that you want to be able to silence even when the gas alarm is
still tripped.
Use switch SW1 on the main circuit board set the operation of the alarms/relays:
A1 alarm
SW1
Mode of operation
A B
Rising
Falling
ON
OFF
Non-latching
Latching
ON
OFF
SW1 on main
circuit board
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