BAPI 51722 Carbon Monoxide Rough Service Sensor Installation Guide
- June 17, 2024
- BAPI
Table of Contents
Rough Service Carbon Monoxide
Installation & Operating Instructions
51722_ins_CO_Rough_Service
rev. 12/07/23
Product Identification and Overview
- Electrochemical Sensor with Self-Test
- Optional %RH Measurement
- Field Selectable 0 to 5 or 0 to 10 VDC Outputs
- Certificate of Calibration Included with Sensors and Replacement Modules
BAPI’s Carbon Monoxide Rough Service Sensor offers enhanced electrochemical
sensing with outstanding accuracy at low concentrations. It features a
ventilated BAPI-Box and is ideal for parking ramps, equipment rooms and
warehouses.
The unit has a CO measurement range of 0 to 500 ppm. It includes optional %RH
measurement. The CO and %RH outputs are field selectable for 0 to 5 or 0 to 10
VDC. The unit can be ordered with flying leads or a terminal strip.
Mounting
- Mount the unit on a solid, non-vibrating surface 3 to 5 feet above floor level or as specified by local building codes. Do not mount near supply or return diffusers.
- Mount in a horizontal orientation with the enclosure hinge at the top as shown in Fig 1. Mounting in other orientations increases the likelihood that water droplets will touch the sensor elements and damage the sensor.
- Use the mounting template on the next page (or the enclosure itself) to to mark the pilot-hole locations. Use the 4 included #10 (M5) screws on the four mounting feet of the enclosure. A pilot-hole makes mounting easier.
- Snug up the screws so that the foam backing is partially depressed but do not over-tighten or strip the screw threads. The foam is for insulation and vibration dampening.
- Place the provided #6 screws into the holes on each side of the lid latch to make the cover tamper resistant.
Mounting Template (Shown actual size)
Fig. 2: Screw Hole Template. Drill center 7/8″ (22mm) hole for rear conduit entry.
Termination
BAPI recommends using twisted pair of at least 22AWG and sealant filled
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
fluctuating 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 difficulties, 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.
WIRE TERMINATIONS
V+: 12.5 to 40 VDC, 10 mA Max or 12.5 to 28 VAC, 1.4 VA Max
GND: Ground for Power and Analog Output
CO: CO PPM Level, 0 to 5 or 0 to 10V Output
RH: %RH Level, 0 to 5 or 0 to 10V Output (if enabled)
Keeping the Enclosure Air Tight After Termination
For the sensor to work correctly, the wiring entrance must remain air tight. If the CO unit 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 fill the enclosure through the wiring opening. This draft may prevent the unit from measuring ambient Carbon Monoxide. BAPI recommends either a liquid-tight fitting 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
(2.5 to 7.6mm) to outside diameter to enter the box. Tightening the collar
onto the wire cable keeps the wiring entrance air tight.
Conduit
Included with the sensor is a foam plug to seal the ½ inch (13mm) EMT. Place
the wires into the plug as shown in Fig. 5 and then insert the plug into the
conduit sealing the conduit.
Operation
POWER UP
On initial power up, the unit performs a self-test to ensure that the CO
Sensor Module is not at the end of its life. This self-test typically takes
about 45 seconds, and during this time, the green LED (visible on the face of
the unit) will blink slowly. Under certain circumstances, the self-test may
take up to 13 minutes. When the self-test is complete, the green LED will go
to a steady “on” state and the unit will be fully operational.
SELF-TEST BUTTON
The unit automatically conducts a self-test daily to ensure that the CO Sensor
Module is not at the end of its life, but the “Self-Test” button allows
additional testing of the CO sensor if desired.
Push and hold the button for 2 seconds to put the unit into self-test mode.
During the self-test, the green LED will begin to blink slowly. The self-test
typically takes about 45 seconds, but under certain circumstances it may take
up to 13 minutes. When the self-test is complete, the green LED will go to a
steady “on” state, indicating that the CO Sensor Module is not at the end of
its life. If the red LED (visible on the face of the unit) and green LED both
blink slowly, this indicates that the CO Sensor Module is at
end of life.
VOLTAGE OUTPUT JUMPER J1
Jumper switch J1 sets the analog output voltage for the CO and optional %RH to
0 to 5 or 0 to 10 VDC.
Status LEDs
The green and red Status LEDs are visible through the clear cover of the unit and indicate various sensor conditions as listed below.
| Green LED | Red LED | Status |
|---|---|---|
| Solid | Off | Power is applied and there are no fault conditions. |
| Blinking Slow | Off | Running a self-test. |
| Off | Blinking Fast | The unit had detected an output ground fault of either the |
CO or %RH sensors.
Off| Blinking Slow| CO alarm condition (CO PPM level Is above 300 ppm)
Blinking Slow| Blinking Slow| The CO sensor is at the end of life or either
the CO or %RH sensor has been disconnected (reconnect the sensor and cycle
power to clear the alert). Either condition sends the CO analog output to its
max value until power Is cycled.
Maintenance
The unit should be vacuumed clean once a year or more, depending on the rate of accumulation of any dust or dirt. To avoid sensor damage, the unit MUST NOT be submerged in any liquids. Hosing or splashing of the unit with any liquids must also be avoided and may void the warranty.
Specifications
Power: 12.5 to 40 VDC, 10 mA Max or 12.5 to 28 VAC, 1.4 VA Max
CO Measurement Range: 0 to 500 ppm
CO Sensor Accuracy: <200ppm = ±3% FS, 32 to 122°F (0 to 50°C) 201 to 500
ppm = ±5% FS, 50 to 122°F (10 to 50°C)
Optional %RH Sensor Accuracy: ±2%RH (20 to 80%) @ 25°C, Fully Compensated
Response Time: <80 seconds from 10 to 90% of range
Sensor Element Life: 7 Years Typical
Field Selectable Outputs 0 to 5 or 0 to 10 VDC
Field Wiring: Flying Leads (22 AWG) or Terminal Strip
Environmental Operation Range Continuous: 32 to 122°F (0 to 50°C) 5 to
95%RH Noncondensing
Intermittent: -40 to 131°F (-40 to 55°C) 5 to 95%RH Noncondensing
Agency: RoHS
Diagnostics
POSSIBLE PROBLEMS:
General troubleshooting| POSSIBLE SOLUTIONS:
• Determine that the input is set up correctly in the controller’s and
building automation software.
• Check wiring for proper termination.
• Check for corrosion at either the controller or the sensor. Clean off the
corrosion, re-strip the interconnecting wire and reapply the connection. In
extreme cases, replace the controller, interconnecting wire and/or sensor.
• Check that the wiring is good between the CO unit and the controller. To do
this, label the wires at both ends and then disconnect the wires from the
controller and the sensor. With the interconnecting wires separated at both
ends, use a multimeter to measure the resistance from wire-to-wire. The meter
should read either greater than 10 Meg-ohms, open or OL depending on the style
of meter. Now connect the wires together at one end and measure the resistance
from wire-to-wire with a multimeter at the other end. The meter
should read less than 10 ohms for 22 gauge or larger wire and runs of 250 feet
(76m) or less. The resistance may be slightly higher for smaller wires or
longer runs. If either test fails, replace the wire.
---|---
Unit does not operate| • Cycle power.
• Disconnect the power wires from the power source and check for proper power
at the source as specified in the Termination section on page 3. If the
voltage is outside the specifications, troubleshoot the power source.
Reconnect power wires to the source when finished.
• Disconnect the power wires at the sensor and verify that the power is the
same at the sensor as at the power source. If the voltage is different at the
sensor from the source, troubleshoot the wiring. Reconnect power wires to
sensor when finished.
• Measure the power at the sensor with the power wires connected to the power
source and to the sensor. If the voltage is outside the limits specified on
page 3, but within the limits when the wires are disconnected to the sensor,
call your BAPI representative.
Building Automation Products, Inc.,
750 North Royal Avenue,
Gays Mills, WI 54631 USA
Tel:+1-608-735-4800
Fax+1-608-735-4804
E-mail:sales@bapihvac.com
Web:www.bapihvac.com
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