BAPI 53000 Digital CO and NO2 Sensors Instruction Manual
Product Identification and Overview
- Several options for Temperature, Humidity, Carbon Monoxide (CO) and Nitrogen Dioxide (NO2)
- Field configurable BACnet MS/TP and MODBUS RTU output
- CO measurement range of 0 to 500 ppm
- NO2 measurement range of 0 to 20 ppm
- CO and NO2 sensing elements last approximately 7 years and are automatically self-tested daily
- Electronic copies of CO and NO2 certificates of calibration available upon request at no extra charge
- Rough service wall/beam mount or duct mount – perfect for parking structures, equipment rooms or warehouses.
Note:
CO and/or NO2 sensors must be installed and powered within 4 months of purchase to prevent loss of accuracy.
Configuring
These steps are often easier to do before mounting the sensor and can be completed without connecting power to
the sensor. If the sensor is powered while changes are made, power must be cycled for the changes to take effect.
Sensor Address
Each sensor on the RS-485 Line must be assigned a unique address. DIP switches 1 through 8 set the binary address for the sensor. An address of 0 is invalid. (Fig 4)
BACnet and MODBUS Configuration
- Use BAPI’s Device Configuration utility and a computer’s USB connection to complete all other configuration changes. The sensor has a USB-C connection.
- Download the utility from the Digital CO and NO2 Sensor webpage on BAPI’s website (link below) and follow the instructions for its user guide.
(Digital CO and NO2 Sensor webpage: https://www.bapihvac.com/product/digital-co-and-no2-sensor/) - MODBUS uses Little-endian for byte order.
Wall Mounting
- BAPI recommends using Clean-Cut Tool (part number BA/CLN-CUT-50) to open your wire-entry port to avoid damaging the circuit board.
- Mount the unit on a solid, non-vibrating surface 3 to 5 feet (900 to 1500mm) above floor level or as specified by local building codes. Do not mount near supply or return diffuses.
- 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
- 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.
Fig. 1: Rough service unit wall mounting
Duct Unit Mounting
- BAPI recommends using Clean-Cut Tool (part number BA/CLN-CUT-50) to open your wire-entry port to avoid damaging the circuit board.
- 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 or widths from an elbow, damper or other duct restriction.
- Drill a 1” (25mm) 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.
Fig. 2: Duct unit mounting
Mounting Template (Shown actual size)
Fig. 3: Screw Hole Template. Drill center 7/8” (22mm) hole for rear conduit entry.
Termination
BAPI recommends using twisted pair of at least 22AWG. 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.
Connecting Multiple Sensors on the Same RS485 Line
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
OUT3
Not used
OUT2/B
BACnet/Modbus RS485
OUT1/A
BACnet/Modbus RS485
GND
Power Ground
V+
15 to 40VDC, 35mA max
18 to 24VAC, 2.7VA max
Fig. 4: Field Wiring Terminals
Connecting Multiple Sensors on the Same RS485 Line
BAPI recommends a maximum of 64 sensors with BACnet and 32 sensors with MODBUS to reduce network congestion. Maximum wire length of 4,000 ft (1,200 m).
Fig. 5: Multiple sensors connected to the same RS485 Line
Keeping the Enclosure Air Tight After Termination
For the sensor to work correctly, the wiring entrance must remain air tight. If the sensor 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 gas. 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.
Fig. 6: Wires Through Foam Plug
Operation
INITIAL POWER UP
- The sensor will immediately begin sending readings upon power up. However, allow 3 hrs for the CO and NO2 sensing elements to warm up before their readings can be considered accurate.
NORMAL OPERATION
- The unit will automatically perform a self-test every 24 hours to assure that the CO and NO2 sensing elements are not at end of life.
- The self-test typically takes 1 minute to run, but may take up to 15 minutes. During the self-test, the sensor reports its last CO and/or NO2 reading prior to the start of self-test.
a. A failed self-test for BACnet is indicated by the Reliability property of the object showing “Communication Failure.”
b. A failed self-test for MODBUS is indicated by the dead Count register of the object showing 10 or greater.
MODBUS Map
Sensor Table | |||||
Sensor | Input Type | Range (min) | Range (max) | Unit Type | Units of Measure |
CO | 5 | 0 | 500 | 96 | PPM |
NO2 | 7 | 0 | 20 | 96 | PPM |
Temperature (°F) | 9 | -40 | 158 | 64 | °F |
Temperature (°C) | 10 | -40 | 70 | 62 | °C |
Relative Humidity | 11 | 0 | 100 | 29 | % |
MODBUS Map continued…
The sensors in the Sensor Table are listed in priority order. The registers that are used are dependant on the priority order and which are present.
For example:
- A sensor that includes only CO and NO2 will assign CO to the Sensor 1 registers and NO2 to the Sensor 2 registers. rev. 10/01/24
- A sensor that includes only NO2, Temperature, and Humidity will assign NO2 to the Sensor 1 registers, Temperature (°F) to the Sensor 2 registers, Temperature (°C) to the Sensor 3 registers, and Humidity to the Sensor 4 registers.
Function 3 Registers | |||||
Name | Location | Data Type | Read/Write | Value | Notes |
Firmware Version | 0x4000 | uint16[8] | R | xx123456 | |
Sensor Serial Number | 0x4008 | uint16[10] | R | BAP xxxxxxx | |
Baud Rate | 0x406C | uint32 | R/W | 9600 | Use BAPI Device Configuration utility to edit. |
Stop Bits | 0x406F | uint16 | R/W | 0 | Use BAPI Device Configuration utility to edit. |
Parity | 0x4070 | uint16 | R/W | 0 | Use BAPI Device Configuration utility to edit. |
Sensor 1 Input Type | 0x408C | uint16 | R | see Sensor Table | Number code for the type of sensor. |
Sensor 1 Range (min) | 0x408E | float32 | R | see Sensor Table | The min sensor value for normal operation. |
Sensor 1 Range (max) | 0x4090 | float32 | R | see Sensor Table | The max sensor value for normal operation. |
Sensor 1 Unit Type | 0x4092 | uint16 | R | see Sensor Table | The BACnet unit type. See https://store.chipkin.com/articles/bacnet-engineering-units-enumerations |
Sensor 1 Poll Interval | 0x4096 | uint16 | R | 1000 | The polling rate of the sensor in milliseconds. |
Sensor 2 Input Type | 0x40BA | uint16 | R | see Sensor Table | |
Sensor 2 Range (min) | 0x40BC | float32 | R | see Sensor Table | |
Sensor 2 Range (max) | 0x40BE | float32 | R | see Sensor Table | |
Sensor 2 Unit Type | 0x40C0 | uint16 | R | see Sensor Table | |
Sensor 2 Poll Interval | 0x40C4 | uint16 | R | 1000 | |
Sensor 3 Input Type | 0x40E8 | uint16 | R | see Sensor Table | |
Sensor 3 Range (min) | 0x40EA | float32 | R | see Sensor Table | |
Sensor 3 Range (max) | 0x40EC | float32 | R | see Sensor Table | |
Sensor 3 Unit Type | 0x40EE | uint16 | R | see Sensor Table | |
Sensor 3 Poll Interval | 0x40F2 | uint16 | R | 1000 | |
Sensor 4 Input Type | 0x4116 | uint16 | R | see Sensor Table | |
Sensor 4 Range (min) | 0x4118 | float32 | R | see Sensor Table | |
Sensor 4 Range (max) | 0x411A | float32 | R | see Sensor Table | |
Sensor 4 Unit Type | 0x411C | uint16 | R | see Sensor Table | |
Sensor 4 Poll Interval | 0x4120 | uint16 | R | 1000 | |
Sensor 5 Input Type | 0x4144 | uint16 | R | see Sensor Table | |
Sensor 5 Range (min) | 0x4146 | float32 | R | see Sensor Table | |
Sensor 5 Range (max) | 0x4148 | float32 | R | see Sensor Table | |
Sensor 5 Unit Type | 0x414A | uint16 | R | see Sensor Table | |
Sensor 5 Poll Interval | 0x414E | uint16 | R | 1000 |
Function 4 Registers | |||
Name | Location | Data Type | Notes |
Sensor 1 Output Value | 0x3002 | float32 | The sensing element value. |
Sensor 1 Dead Count | 0x3004 | uint16 | The dead Count of the sensor. Will increment each time a communication failure happens and resets to 0 upon each successful sensor reading. |
Sensor 2 Output Value | 0x3008 | float32 | |
Sensor 2 Dead Count | 0x300A | uint16 | |
Sensor 3 Output Value | 0x307A | float32 | |
Sensor 3 Dead Count | 0x307C | uint16 | |
Sensor 4 Output Value | 0x3080 | float32 | |
Sensor 4 Dead Count | 0x3082 | uint16 | |
Sensor 5 Output Value | 0x3086 | float32 | |
Sensor 5 Dead Count | 0x3088 | uint16 |
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
Diagnostics
POSSIBLE PROBLEMS: | POSSIBLE SOLUTIONS: |
General troubleshooting |
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Unit does not operate |
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Communication issues |
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Specifications
Power: 15 to 40VDC, 35mA max | 18 to 24VAC, 2.7VA max
Field Wiring Terminal Blocks: 18 to 24 AWG
Environmental Operation Range:
-4 to 104°F (-20 to 40°C) | 15 to 95%RH Non-condensing
Enclosure Material: UV-resistant Poly carbonate, UL94 V-0
CO and NO2Sensor Element Life: 7 years typical
Agency: RoHS
CO Sensor:
Type: Petrochemical
Range: 0 to 500 ppm
Accuracy: ±6 ppm from 0 to 200 ppm | ±25 ppm from 200 to 500 ppm
NO2 Sensor:
Type: Electrochemical
Range: 0 to 20 ppm
Accuracy: ±0.5 ppm from 0 to 10 ppm
Temperature Sensor:
Range: -40 to 158°F (-40 to 70°C)
Accuracy: ±0.54°F (±0.3°C) from 68 to 104°F (20 to 40°C) [see graph]
Humidity Sensor:
Range: 0 to 100%RH
Accuracy: ±2%RH from 20 to 80% @ 25°C
Duct Mount
(Dimensions are the same for the rough service unit without the aspiration tube)
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
Documents / Resources
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