Detcon 10B - Manual (Page 3)

2.0 D ESCRIPTION
Detcon Model 10 single channel digital control modules are designed to supervise and display the status of a single
remote gas sensor assembly. Modules are available for a variety of toxic and combustible gases. Model 10 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 10 control modules and Detcon gas sensor assemblies may be installed in a common mainframe
assembly thereby providing monitoring for a variety of gases. Model 10 control modules are compatible with a linear 4-20
mA DC input signal. The module features a direct reading 2 or 3 digit display of the gas concentration, f lashing overange,
RS-485 Modbus™ serial output, 4-20 mA analog signal output, and three alarm relays that are status displayed via light emit-
ting diodes located on the front panel. Alarm functions are alarm 1, alarm 2, and fault. All alarms are switch 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.
2.1 S
PECIFICATIONS
Range
Software selectable between 0-5 ppm/% and 0-999 ppm/% in increments of 5 ppm/%
Accuracy/Repeatability
± 2% F.S.
Operating Temperature
–40° F to +175° F
Input Power
24 VDC standard; 12 VDC optional
Power Consumption (per channel)
Normal: 0.8 watts*
Full Alarm: 1.7 watts*
*Control module only. See sensor product literature for power per sensor.
Model 10 Single Channel Digital Control Module PG.3
Two or three digit indicator serves as both a power on indicator
and a direct reading display of the gas concentration. The display
will also flash on and off during any overrange condition.
Alarm set points — alarm 1 and alarm 2 — are menu/software
adjustable in 1 ppm/% increments between 10% & 90% of full
scale range. Programmable switches allow for several user
selectable alarm options.
The fault alarm, depending on the switch programmable
configuration, will activate on loss of power, internal power supply
fault, open circuit in field wiring, open heater/bridge in sensor,
or during an alarm disable condition.
The alarm reset switch resets alarms that have been
programmed latching. It also acts as a menu interface switch to
activate the program menu system and microprocessor
supervised test functions.