BAPI Carbon Monoxide Sensor Catalog Page
Duct and Rough Service Carbon Monoxide Sensor
34612_ins_CO_V_BB
Product Identication and Overview
BAPI’s Carbon Monoxide Sensor offers enhanced electrochemical sensing
with outstanding accuracy at low concentrations. The Duct unit samples duct
air using an aspiration tube. The Rough Service unit features a ventilated
BAPI-Box and is ideal for parking ramps, equipment rooms and warehouses.
The sensor has eld selectable CO ranges of 0 to 100, 0 to 200, 0 to 300 and
0 to 500 ppm. It also has eld selectable outputs of 0 to 5, 1 to 5, 0 to 10, 2 to
10 VDC and 3-wire 4 to 20 mA output. The large LCD is backlit for 10 seconds
after any button push.
Two independent SPDT alarm contacts switch at eld selectable CO
concentrations of 25, 35, 50, 100 and 200 ppm. An alarm timer can hold the
output relays on for one to ten minutes after the CO level has fallen below
80% of setpoint. This allows additional fan run time to be sure that the CO
has been purged. The eld replaceable sensor element lasts approximately 7
years and is self tested daily.
Note: There is a small heart symbol in the top right corner of the display that blinks
every ½ second. This heartbeat indicates that the unit is operating correctly.
Mounting
Installation & Operating Instructions
rev. 10/11/17
Rough
Service
(top)
and
Duct CO
Sensors
Rough Service Ventilated Unit
1. Mount the unit on a solid, non-vibrating surface 3 to 5 feet above oor level. Mount
in a horizontal orientation with the enclosure hinge at the top as shown in Fig 2.
Failure to do so may degrade the life of the sensor element. Do not mount near
supply or return diffusers.
2. Use BAPI recommended #10 (M5) screws on the four mounting feet of the
enclosure. A pilot-hole makes mounting easier. Use the enclosure mounting feet to
mark the pilot-hole locations.
3. Snug up the screws so that the foam backing is depressed but do not over-tighten
or strip the screw threads.
4. Place the provided #6 screws into the holes on each site of the lid latch to make the
cover tamper resistant.
Duct Aspiration Tube Unit
1. BAPI recommends placing the sensor in the middle of the duct wall, away from
stratied air, to achieve the best reading. The unit should also be a minimum of 3
duct diameters from an elbow, damper or other duct restriction.
2. Drill a 1” hole for the aspiration probe. Position the box so that airow is directly into
the holes on one side of the aspiration probe. The air direction is not important.
4. Mount the enclosure to the duct using
BAPI recommended #10 screws
through a minimum of two mounting
feet on opposite corners. A 1/8” pilot
hole makes mounting easier. Use the
mounting feet to mark the pilot-hole
locations.
5. Snug the screws until the foam backing
is compressed about 50% to prevent
air leakage but do not over-tighten.
6. Use the provided #6 screws to secure
the cover for IP66 rating.
7. BAPI recommends sealing the conduit
opening with berglass insulation.
Specications subject to change without notice.
Fig. 2: Rough Service
Unit mounting
Fig. 1: Screw Hole Template.
Drill center 7/8” hole for rear
conduit entry on Rough Service
Unit. Drill 1” hole for Aspiration
Tube on Duct Unit
Fig. 3: Duct Unit mounting
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Duct and Rough Service Carbon Monoxide Sensor
Installation & Operating Instructions
34612_ins_CO_V_BB
Termination
BAPI recommends using twisted pair of at least 22AWG and sealant lled connectors for all wire connections. Larger gauge
wire may be required for long runs. All wiring must comply with the National Electric Code (NEC) and local codes.
Do NOT run this device’s wiring in the same conduit as AC power wiring of NEC class 1, NEC class 2, NEC class 3 or with
wiring used to supply highly inductive loads such as motors, contactors and relays. BAPI’s tests show that uctuating and
inaccurate signal levels are possible when AC power wiring is present in the same conduit as the signal lines. If you are
experiencing any of these difculties, please contact your BAPI representative.
BAPI recommends wiring the product with power disconnected. Proper supply voltage, polarity and wiring
connections are important to a successful installation. Not observing these recommendations may damage the
product and void the warranty.
WIRING TERMINALS
VIN – Input Power
18 to 28 VAC, 7.2 VA Max
18 to 40 VDC, 180 mA Max.
GROUND:
N.C.
COM
N.O.
N.C.
COM
N.O.
OUT
GND
VIN
Power and Analog Output Ground
I/V OUT
Three wire voltage or current signal
RELAYS
Relay contacts are galvanically isolated. They are
not connected to each other, or to circuit power or
ground in the carbon monoxide transmitter.
N.O. – Normally Open Contact
COM – Common Contact
N.C. – Normally Closed Contact
rev. 10/11/17
Fig. 4: Field Wiring Terminals
NOTE: The connectors that plug into the jacks on the board use a rising block screw terminal to hold the wires. If the
block is in a partially up position, the wire may be inserted under the block and the wire will not be held when the screw
is tightened. To avoid improper wiring, turn the male connector screws counterclockwise until the block is below the wire
opening before inserting the wire. Lightly tug on each wire after tightening to verify proper termination.
Keeping the Enclosure Air Tight After Termination
For the sensor to work correctly, the wiring entrance must remain air tight. If the CO transmitter is mounted to
a hollow wall and wired through its back, or wired with conduit, it is possible that a draft of clean air may ll the
enclosure through the wiring opening. This draft may prevent the unit from measuring ambient Carbon Monoxide.
BAPI recommends either a liquid-tight tting or plugging the conduit at the enclosure.
• Liquid-Tight Fitting – BAPI’s Liquid-Tight Fitting (BA/LTF) allows wire cables
of 0.1 to 0.3 inch outside diameter to enter the box. Tightening the collar onto the
wire cable keeps the wiring entrance air tight.
• Conduit – Included with the Carbon Monoxide transmitter is a foam plug to seal
the ½ inch EMT. Place the wires into the plug as shown in Fig. 5 and then insert
the plug into the conduit sealing the conduit.
Fig. 5:
Wires Through Foam Plug
Specications subject to change without notice.
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Duct and Rough Service Carbon Monoxide Sensor
Installation & Operating Instructions
34612_ins_CO_V_BB
Relay Load Termination
The Alarm Relays may be used to switch a load on or off. Fig. 6 shows a circuit that may be used to switch on a
load under alarm conditions. Fig. 7 shows a circuit that may be used to switch off a load under alarm conditions.
For clarity only Alarm Relay 1 is shown, Alarm Relay 2 may be used in the same way.
Fig. 7:
Fig. 6:
Turn “On”
a load
under alarm
conditions
Turn “Off”
a load
under alarm
conditions
rev. 10/11/17
Fig. 8 shows how two or more Carbon Monoxide Transmitters may be interconnected to switch a load. This example
shows how to turn on a load under alarm conditions. Similar circuitry may be used to turn off a load under alarm
conditions. Fig. 8 connects together the Normally Open terminals of Alarm Relay #1 in both units and connects them
to the load. Fig. 8 also connects together the Common terminals of Alarm Relay #1 in both units and then connects
them to the load’s power. This wiring circuit will drive the load whenever any one of the Carbon Monoxide Transmitters is in an alarm condition. Note: Be sure to only connect similar terminals from each unit (Normally Open terminal
to Normally Open terminal, etc.). Cross connecting any of the terminals (Normally Closed to Common, etc.) may
damage the units and may void the warranty.
For clarity only Alarm Relay 1 is shown in the example below. Alarm Relay 2 may be used in the same way.
Fig. 8:
Turn “On” a
load when
either unit
enters an alarm
condition
Specications subject to change without notice.
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