cause large voltage spikes to appear on the AC wiring. These spikes can interfere with the
proper operation of the transmitter. The easiest way to avoid much of this interference is by
providing power to the transmitter through a dedicated circuit from the service panel. In some
very noisy situations, a line filter can be connected in the power supply circuit just ahead of the
wiring connections at the transmitter.
Provide a dedicated circuit at the required operating voltage at each transmitter mounting
location. Follow all national and local wiring codes. The wiring should be at least 14 AWG. A
conductor connected to Earth ground should also be provided. The circuit must include a
disconnect switch located within easy reach of the transmitter.
Be sure that the step-down transformer provides 24 VAC and has at least a 6 VA rating. The
power requirements for the transmitter are also listed on the label on the left side of the unit.
Color-coded wires exiting the transmitter housing through the top conduit connector are
provided for connecting the operating voltage to the transmitter. Therefore, it should not be
necessary to remove the front cover from the transmitter when connecting the voltage supply.
Connect the hot power conductor to the black wire and the neutral conductor to the white wire.
Connecting the Voltage or Current Proportional Output
The Brasch Gas Transmitters include circuits that provide either a current loop or voltage
proportional output for each gas sensor. Each output produces a linear response over the full
scale range of the sensor. A detailed description of these outputs can be found starting on
page 18.
IOM02
Rev 1.0 – December 22, 2020
14
Note
Do not operate the transmitter on the same AC circuit with the ventilation components.
Doing this will almost always cause improper transmitter operation.
CAUTION
Operating this transmitter with the incorrect voltage and power requirement can cause
internal electrical components to overheat and fail. Operation with the wrong power
requirements will void the manufacturer’s warranty, and the installer will be responsible for
any damage that occurs.
Contact Brasch Environmental Technologies, LLC before connecting power to the transmitter
if you are unsure of the correct power requirement.
