BULLETIN I-680
3-2-99
1
1.0 Installation Procedures
1.1 MOUNTING:
The Nitrogen Dioxide Transmitter must be mounted indoors and kept dry at all times. This transmitter
should be mounted in a well-populated area, and placed so the display can be easily seen. The unit
should be mounted at breathing height that is generally between 5 to 7 feet above the floor. Figure #1
shows the mounting hole locations. Mount the transmitter to a rigid surface using #10 hardware.
1.2 WIRING:
1.21 Input Power Wiring
This transmitter requires an input voltage of 24 VAC, 50/60 Hz at a load rating of 28 VA. If a grounded
24 VAC supply voltage is supplied, then the hot line should be wired to terminal T1 and the grounded
line should be wired to T2. Brasch Manufacturing Co., Inc. can provide a step-down transformer for
changing 208-240 VAC or 120 VAC at 50/60 Hz to 24 VAC at 50/60 Hz. See the 6.0 Accessories
Section (Page 4) for the transformer part numbers. The supply circuit must include a disconnect device
or switch located close to the transmitter and marked as the disconnect device for the transmitter. This
will assure continued operation without interruption from remote failures. To provide noise suppression
the input power must be wired, as shown in Figure #2 (Page 2), with the ground connected. Use copper
conductors only, rated for a minimum of 250 volts, 14 AWG.
Installation, Operating
And
Maintenance Instructions
Nitrogen Dioxide
Gas Transmitter
BGS-ND-TRNS
CAUTION:
Leave a minimum of 2” clearance to other surfaces, and under no circumstances
should the ventilation louvers in the cover be blocked. Be sure that metal shavings
and other contaminants are removed from inside the transmitter.
Use only qualified personnel for the installation of this transmitter. All wiring should be
done in accordance with local codes and the latest edition of the National Electrical Code
(ANSI/NFPA 70).
Figure #1 Mounting Hole Locations
