Sierra Monitor Corporation 5100-06-IT - Manual (Page 7)

Model 5100-XX-IT Toxic Gas Sensor Module
Page: 3
1.4.6 REMOTE ALARM RESET
An input is available for connection of remote alarm reset. Figure 4-8 provides the wiring termination for
connecting the remote alarm reset. This only resets local alarms, not Sentry alarms.
1.4.7 OPTIONAL INTEGRAL RELAYS
The optional relays are integral to the gas sensor module and are rated as SPDT, 250VAC, 5 Amps* for
the High Alarm and Low Alarm relays and SPDT, 250 VAC, 0.25 Amp for the Trouble relay.
* HART option alarm relays are all SPDT, 250VAC, 2 Amp
If the gas sensor module is provided with the optional relays, it will include Terminal P4 on the interface
board (Figure 4-3 and 4-4). Relay output connections are on P4.
1.5 MECHANICAL
The sensor module is comprised of the following three primary components:
 ENCLOSURE
Standard on the 5100-XX-IT is an explosion-proof, rain-tight cast aluminum electrical housing (Figure 1-3)
with three ¾” FNPT conduit hubs. The 5100-XX-IT-SS has a 316 Stainless Steel enclosure (Figure 1-2).
Both enclosure covers have a viewing window. The design of the enclosure allows 3-way mounting
choices as shown in figure 1-3.
 TRANSMITTER ELECTRONICS
Electronic Assembly consisting of one printed circuit board assembly mounted under a cover plate,
plugged into one field termination board. Connectors for wiring for power, signal interface and alarm
relays are located on the bottom of the termination board
.
 SENSOR ASSEMBLY
The sensor assembly includes an explosion proof housing containing the gas sensor and a wiring harness
for connection to the transmitter. The sensor assembly threads into one hub of the enclosure. The
exposed end of the sensor assembly is threaded to allow connection of a rain-shield or calibration gas.
1.6 INTERCONNECT WIRING
Not supplied with the sensor module, but necessary to the installation and operation is the shield cable which
connects the module to its power source and controller. Before this wiring is installed it is important to read
and understand the control system installation instructions to determine wiring requirements and alternatives.
1.7 POWER REQUIREMENTS
The modules operate on DC power between 10 VDC and 30 VDC. Regulated DC power must be supplied
from a separate source or from an approved Sentry or IT controller.