Connecting the Remote Transmitters
If remote transmitters are a part of this detector, the detector will supply the operating power to
each transmitter. Use a five-conductor shielded cable with color-coded conductors to connect
the power. Three of these connectors provide the positive voltage, negative voltage, and
reference common to the transmitter for power. The remaining conductors carry the signal
from the transmitter to the controller. See figure 10 on page 43 and figure 11 on page 44 for
details. If possible, choose a cable with color-coded conductors that follow the suggested
color scheme listed on the drawings.
The transmitter will be shipped with a cable containing five color-coded wires exiting the side of
the housing through a conduit fitting. This cable is labeled “Transmitters” to differentiate the
wiring connections from the relay wiring. If you have chosen color-coded conductors that
match the wire colors, connect the cable conductors to the wires of the same color. If your
cable conductors do not match the wire colors, assign a cable conductor color to each wire
and make a list of this assignment. Follow this color assignment when connecting any other
transmitters in the system. All transmitters share the same conductors back to the controller.
Therefore, a five-conductor cable can be connected from transmitter to transmitter, or from
transmitter to controller, as the situation dictates. Follow the wiring diagrams on page 43 and
44 to determine the proper connections at the controller.
Connecting the Ventilation System
As an energy saving device, the main function of the Brasch Gas Detector is to operate the
ventilation system only when necessary. To accomplish this, the detector is equipped with
three control relays per zone with color-coded wires exiting the detector housing through the
top, left conduit connector. The contacts of these relays can control various ventilation system
configurations. Figures 2, 3, 4, and 5 on pages 21 and 22 give examples of the wiring for the
most common systems. Coil control signals on relays for damper and make-up air units can
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CAUTION
It is very important that the power and signal connections between each transmitter and
between the transmitters and the Brasch controller be correct. If the connections are wired
incorrectly, damage to both the transmitters and the controller will occur.
Use a cable with color-coded conductors and make sure that the same conductor connects
to the same terminal on each transmitter and the controller.
Do not apply power to the transmitter or controller unless you are sure that the connections
are correct.
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