Detcon 110A-FB-BBU - Manual (Page 2)

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1.1 DESCRIPTION
Detcon Model 110A-FB-BB is a single channel gas detection system, designed to supervise and display
the status of remote sensor assemblies that monitor ambient air for a variety of toxic and combustible
gases. The digital controls are compatible with a linear 4-20 madc input signal. The front panel features a
direct reading 2 digit display of the concentration of gas and 3 alarm functions that are status displayed via
light emitting diodes.
The assembly is enclosed in a NEMA 4X molded fiberglass case with a hinged, gasketed door and is
designed for surface mounting in both indoor and outdoor locations. A plexiglas view window is mounted
in the door. The NEMA 4X rating is by definition raintight and therefore suitable for outdoor location in
electrically non-hazardous environments.
The system is powered by AC line power and is backed up by batteries in the event of a power failure.
The control enclosure includes, as standard operating controls (DWG #800.27A); a power on/off switch,
an alarm reset switch, an alarm disable switch with LED indicator, AC line power fuse, DC power fuse,
sensor power loop fuse, and alarm output fuses (5A) for Fault, Low and High alarm dry contacts. Discreet
output terminal strips located on the controller mother board are provided for AC power in, DC power from
batteries, sensor terminations, 4-20ma output for remote recording devices, remote reset and Form C dry
contacts (Common, NO and NC). Contacts are provided for 3 alarms; High, Low and Fault and are rated
8 amp @ 117 VAC / 5 amp @ 30 VDC. Additional controls include latching / non-latching alarms, alarm
firing direction, and alarm set dip switches.
Detcon Model 110A-FB-BBU Gas Detection System PG.2
The Low and High alarm relays may be programmed for latching or non-latching operation. To program,
refer to JP4 - Low; and JP1 - High (drawing #800.27A). To program for non-latching operation, place the
jumper tab on the upper 2 pins of the connector. To program for latching operation place the jumper tab on
the lower 2 pins of the connector.
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1.4 LATCHING / NON-LATCHING ALARMS
The Low and High alarm levels are adjustable in single digit increments from 1 to 99% of scale. To
program, refer to SW1, SW2, SW3 and SW4 (drawing #800.27A). SW1 corresponds to the Most
Significant Digit (10's) on the high alarm. SW2 corresponds to the Least Significant Digit (1's) on the High
alarm. SW3 corresponds to the Most Significant Digit (10's) on the Low alarm. SW4 corresponds to the
Least Significant Digit (1's) on the Low alarm.
While using a jeweler's screw driver, program the corresponding switches to the desired set point. For
example,if the Low alarm set point is 10 ppm / %, set SW3 to 1 and SW4 to 0. If the High alarm set point
is25, set SW1 to 2 and SW2 to 5.
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1.3 ALARM LEVEL PROGRAMMING
The 110A-FB-BBU controller board has several functions that may be changed or activated by the user.
These include alarm set points, alarm firing direction (descending or ascending), latching alarms, alarm
disable and other functions that will be fully discussed below.
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1.2 PROGRAMMING THE 110A-FB
The Low and High alarms may be programmed to fire during ascending gas conditions or descending
gas condition (as in oxygen deficiency monitoring). To program, refer to JP3 - Low; and JP2 - High
(drawing #800.27A). To program for an alarm to fire in ascending gas conditions, place the jumper tab on
the upper 2 pins of the connector (>). To program for an alarm to fire in descending gas conditions, place
the jumper tab on the lower 2 pins of the connector (<).
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1.5 ALARM FIRING DIRECTION