BAPI VOC (TVOC) Duct and Rough Service Sensor Instructions

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VOC (TVOC) Duct and Rough Service Sensor
Installation & Operating Instructions

Overview and Identification

The quality of the air that we breathe is essential to our health and knowing the air quality level is the first step to improving it. BAPI’s VOC sensors provide critical air quality information.
The total VOC (TVOC) units provide a VOC reading that is the total concentration of all VOCs present in the space within a range of 0 to 2,500 ppb. This is often needed to meet 3rd party building certifications that require separate CO2 and VOC readings.
The Duct unit uses an aspiration tube, while the Rough Service unit uses a ventilated BAPI-Box and is ideal for areas such as outdoor air plenums, equipment rooms, greenhouses, and warehouses.

Mounting Template

Rough Service Unit Mounting

1. 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 a supply or return diffusers.
2. A unit 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.
3. Use the mounting template on the previous page (or the enclosure itself) 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.
4. 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.
5. Place the provided #6 screws into the holes on each side of the lid latch to make the cover tamper-resistant.

Duct Unit Mounting

1. 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.
2. Drill a 1” (26mm) hole for the aspiration tube.
3. Position the box so that airflow is directly into the holes on one side of the aspiration tube. There are no upstream or downstream holes, the air direction is not important.
4. Use the mounting template on the previous page (or the enclosure itself) 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.
5. 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, and to prevent air leakage
6. Place the provided #6 screws into the holes on each side of the lid latch to make the cover tamper-resistant.

Termination

BAPI recommends using twisted pairs of at least 22AWG 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, or 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 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 void the warranty.

Terminal Description
VIN…………..Power, referenced to GND  12 to 24 VDC, 35 mA Max 18 to 24 VAC, 4 VA Max
GND …………To controller Ground [GND or Common] VOUT ……….Voltage Output, VOC Signal (0 to 2,500 ppb), referenced to GND
Voltage Output Jumper 2X
The VOC outputs may be field configured for 0 to 5
VDC or 0 to 10 VDC outputs at any time. Set the 2X jumper on J1 as shown in Figs 7 and 8.

Keeping the Enclosure Air Tight After Termination

For the sensor to work correctly, the wiring entrance must remain airtight. If the VOC 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 VOCs. 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) outside diameter to enter the box. Tightening the collar onto the wire cable keeps the wiring entrance airtight.
• Conduit – Included with the VOC sensor is a foam plug to seal the ½ inch (13mm) EMT. Place the wires into the plug as shown in Fig. 9 and then insert the plug into the conduit sealing the conduit.

Sensor Start-Up
At each power-up, the sensor enters a 15-minute start-up period. During this time, the sensor warms up, stabilizes to its environment, and then begins normal operation.

Optional Sensor Performance Verification and Commissioning

A simple bump test is performed to verify that the sensor responds to elevated VOC levels.

1. Ensure that the sensor has been powered on for at least 15 minutes.
2. Apply a stimulus gas to the sensor as described in Stimulus Preparation and Application.
3. That amount of alcohol vapor will normally exceed the sensor’s max output. If so, the output voltage should read 5 or 10 volts (2,500 ppb) depending on the jumper setting.
4. As the vapor dissipates, the output voltage will decrease.
5. It may take more than 10 minutes to return to normal VOC levels.

Stimulus Preparation and Application

Place 50ml of the Isopropyl Alcohol (70% minimum) into a 200ml bottle (2oz in an 8oz bottle) with a cover and allow it to reach room temperature.

1. Remove the cover from the alcohol bottle, place the tip of the syringe at least halfway into the bottle and withdraw a 60 ml sample of the alcohol vapor. (No liquid)
2. Place the end of the syringe under, or into the bottom ventilation slot of the VOC sensor’s housing.
3. Empty the syringe into a ventilation slot or the partially opened cover of the BAPI Box.

Diagnostics

the controller and BAS software.
– Check wiring at the sensor and controller for proper connections. If there is corrosion on any terminations, clean off the corrosion, re-stripe the interconnecting wire and reapply the connection. In extreme cases, replace the controller, interconnecting wire, and/or sensor.
–  Label the VOC sensor wire terminals at the sensor and controller ends. Disconnect the wires and measure the resistance from wire-to wire with a multimeter.
The meter should read greater than 10 Megohms, open or OL depending on the meter.  Short the wires at one end and measure the resistance from wire to wire at the other end. The the meter should read less than 10 ohms for 22 gauge or larger wire at a  distance of 250 feet (76m) or less.   f either test fails, replace the wire.
– Check the power supply and controller voltage supply.-
Disconnect the sensor and check the power wires for proper voltage (see power specs).
Incorrect VOC Reading|  – Wait 15 minutes after a power interruption.
–  Check all software parameters.
– Determine if the sensor is exposed to an external environment different from the room (conduit draft).

Specifications

Power: (Half-wave rectified)
12 to 24 VDC, 35 mA max
18 to 24 VAC, 4 VAmax
TVOC Unit Detection Range:
0 to 2,500 ppb
Sensing Element:
Micro-machined metal oxide
Start-Up Time:
15 minutes
Response Time:
<60 sec (after start-up time)| S electable Output:
0 to 5 or 0 to 10 VDC > 10KΩ impedance
Wiring:
3 wires, 16 to 22 AWG
Operating Environment:
32 to 122°F (0 to 50°C)
5 to 95%RH non-condensing
Enclosure Material:
UV-Resistant Polycarbonate, UL94, V-0
Agency:
CE EN 61326-1:2013 EMC, UL, RoHS
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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
Specifications are subject to change without notice.

Documents / Resources

| BAPI VOC (TVOC) Duct and Rough Service Sensor [pdf] Instructions
VOC TVOC Duct and Rough Service Sensor, VOC TVOC, Duct and Rough Service Sensor, Rough Service Sensor, Sensor
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