Detcon 12B - Manual (Page 5)

Model 12B
12B Control Module Instruction Manual Rev 1.4 Page 1 of 12
1.0 Description
Detcon Model 12B single channel digital control modules are designed to supervise and display the status of a
single remote sensor assembly. Modules are available for a variety of toxic and combustible gases. Model 12B
series control modules are designed to operate on an input voltage of 24 VDC and are compatible with a
complete line of Detcon enclosures and mainframe hardware assemblies. The available enclosures include
designs for rack or panel mounting in non-hazardous areas (NEMA 1), for weather proof outdoor location in
non-hazardous areas (NEMA 4), and for location in areas electrically classified hazardous or explosion proof
(NEMA 7).
Any combination of Model 12B control modules and Detcon sensor assemblies may be installed in a common
mainframe assembly thereby providing monitoring for a variety of gases. Model 12B control modules are
compatible with a linear 4-20 mA DC input signal. The module features a direct reading 3 digit display of the
gas concentration, flashing over-range, alarm disable, RS-485 Modbus™ serial output, 4-20 mA analog signal
output, and four alarm relays that are status displayed via light emitting diodes located on the front panel.
Alarm functions are alarm 1, alarm 2, alarm 3, and fault. All alarms are jumper programmable for latching or
non-latching operation with a common front panel reset switch. The reset is part of a common bus when
installed in a mainframe, allowing for the use of an external reset switch common to all modules in the
mainframe.