BAPI 40698 CO2 Duct and Rough Service Sensor Instruction Manual
- June 5, 2024
- BAPI
Table of Contents
40698_ins_CO2_3LED_BB
CO2 Duct and Rough Service Sensor
Installation & Operating Instructions
Identification and Overview
The BAPI CO2 Duct Sensor is an accurate and reliable way of incorporating
demand-controlled ventilation. It measures CO2 in ranges of 0 to 2,000, 0 to
5,000, 0 to 10,000 and 0 to 50,000 ppm with a field selectable output of 0 to
5 or 0 to 10 VDC.
BAPI’s Dual Channel (DCD) “24/7” unit has been optimized for continuously
occupied areas and features a 3-point calibration process for enhanced
accuracy and reliability. Altitude and weather patterns can affect CO2
sensors,
even putting them outside of their specified accuracy. The BAPI unit has a
built-in Barometric pressure sensor that continuously compensates the output
for accurate readings despite the weather or altitude.
The Duct unit samples duct air using an aspiration tube. The Rough Service
unit features a ventilated BAPI-Box and is ideal for areas such as outdoor air
plenums, equipment rooms, greenhouses, and warehouses. For 0 to 2,000 PPM
units, the CO2 level is indicated as “Good, Fair, or Poor” by three LEDs on
the front of the unit. If it reaches the top of the PPM range, the red LED
will begin to flash.
Specifications
Power:
12 to 24 VDC, 240 mA
18 to 24 VAC, 12 VA Peak
Field Selectable Voltage Output:
0 to 5 or 0 to 10 VDC
Termination: 3 Terminals, 16 to 22 AWG
Operating Environment:
32 to 122°F (0 to 50°C)
0 to 95%RH non-condensing
Enclosure Rating:
Unventilated BAPI-Box: NEMA 4, IP66
Encl. Material: Polycarbonate, UL94 V-O
CO2 Detection PPM Range: 0 to 2,000, 0 to 5,000, 0 to 10,000 and 0 to 50,000
Start-Up Time: <2 Minutes
Response Time: <2 Minutes for 90% step change typical (after start-up)
LED CO2 Level Indicator
(0 to 2,000 PPM units only):
Good, Green < 1,000 PPM
Fair, Yellow = 1,000 to 1,500 PPM
Poor, Red > 1,500 PPM
CO2 Sensing Elements:
Dual Channel Non-Dispersive Infrared
CO2 Drift Stability:
<5% of full scale over life of product.
CO2 Accuracy:
400 to 1,000 ppm: ±75 ppm
1,000 ppm: ±10% of reading
Certifications: RoHS
Warranty Period: 5 Years
Mounting Template
Rough Service Unit Mounting
Mount the Rough Service sensor on a solid, non-vibrating surface. Wall mounting in a room should be 3 to 5 feet above floor level. The Rough Service CO2 transmitter may be mounted in any orientation. If you are mounting inside a duct or mixing box, mount with the latch facing into the moving air. Refer to local codes for further sensor/transmitter installation information. See BAPI’s “Coverage Area” Application Note for further mounting recommendations. To get to this application note, go to www.bapihvac.com, and select “Resource Library” from the banner. Click on “Application Notes” then scroll down the page to the heading “Air Quality Related” and chose “Coverage Area and Mounting Recommendations for BAPI Indoor Air Quality Sensors”.
- BAPI recommends #10 (provided) screws of a type and length suitable for the mounting surface. Four mounting screws keep the box from twisting, twisting may prevent the latch from operating properly. A pilot hole makes mounting easier. Use the enclosure mounting feet to mark the pilot hole locations.
- Snug up the screws so that the foam backing is depressed but do not over-tighten or strip the screw threads.
- Place the provided #6 screws into the holes on each side of the lid latch to make the cover tamper-resistant.
Duct Unit Mounting
- BAPI recommends placing the sensor in the middle of the duct wall, away from stratified 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.
- Drill a 1” hole for the aspiration probe. Position the box so that airflow is directly into the holes on one side of the aspiration probe. There are no upstream or downstream holes, the air direction is not important.
- Mount the enclosure to the duct using BAPI recommended #10 screws (provided) through a minimum of two of the mounting feet on opposite corners. A 1/8’ pilot screw hole in the duct makes mounting easier. Use the enclosure mounting feet to mark the pilot-hole locations.
- Snug up the screws so that the foam backing is depressed to prevent air leakage but do not over-tighten or strip the threads.
- Use the provided #6 screws to secure the cover for IP66 rating.
- BAPI recommends sealing the conduit opening with fiberglass insulation.
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. 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.
BAPI recommends wiring the product with the power disconnected. Proper supply voltage, polarity, and wiring connections are important to a successful installation. Not observing these recommendations may damage the product and will void the warranty.
Terminal………………….. Function
VIN……………… 12 to 24 VDC, 240mA 18 to 24 VAC, 12 VA Peak
GND ……………. To controller Ground [GND or Common] VOUT ………….. Voltage Output,
CO2 Signal 0 to 5 or 0 to 10 VDC, Referenced to GND
The CO2 outputs may be field configured for 0 to 5 VDC or 0 to 10 VDC outputs at any time. Set the jumpers on J1 as shown in Figures 7 and 8.
POWERING WITH A BAPI VC350A VOLTAGE CONVERTER
The CO2 unit requires 240mA of current to operate correctly. If this is more
current than can be provided by the controller power output, then the unit
can be powered by a BAPI VC350A or VC350A-EZ Voltage Converter.
Keeping the Enclosure Air Tight After Termination
For the sensor to work correctly, the wiring entrance must remain air-tight. If the CO2 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 fill the enclosure through the wiring opening. This draft may prevent the unit from measuring ambient CO2. 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 inches outside diameter to enter the box. Tightening the
collar onto the wire cable keeps the wiring entrance airtight. -
Conduit – Included with the CO2 transmitter is a foam plug to seal the ½-inch EMT. Place the wires into the plug as shown in Fig. 10 and then insert
the plug into the conduit sealing the conduit.
Diagnostics
Possible Problems:
General troubleshooting
Possible Solutions:
Determine that the input is set up correctly in the controllers and building
automation software.
Check wiring at the sensor and controller for proper connections. 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 the
wiring between the sensor and controller. Label the terminals at the sensor
end and the controller end. Disconnect the interconnecting wires from the
controller and the sensor. With the wires disconnected, measure the resistance
from wire to wire with a multimeter. The meter should read greater than 10
Meg-ohms, open or OL depending on the meter. Short the interconnecting wires
together at one end. Go to the other end and measure the resistance from wire
to wire with a multimeter. The meter should read less than 10 ohms (22 gauge
or larger, 250 feet or less). If either test fails, replace the wire. Check
power supply/controller voltage supply Disconnect sensor and check power wires
for proper voltage (see specifications on page 1)
Incorrect CO2 Reading
Wait 15 minutes after a power interruption.
Check all BAS controller software parameters.
Determine if the sensor is exposed to an external environment different from
the duct area that is being measured.
If the sensor is reading consistently high, make sure that the power supply to
the unit can provide 240mA. A low power situation will cause high CO2
readings.
Note: If the CO2 sensor has consistently given high PPM readings for over
5 days, it will take up to 14 days for the readings to return to normal.
Specifications are subject to change without notice.
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:[email protected] •
Web:www.bapihvac.com