BAPI 52432 Duct Humidity Sensor with Crossover Enclosure Installation Guide

52432 Duct Humidity Sensor with Crossover Enclosure

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Specifications

• Model: Duct Humidity Sensor with BAPI-Box Crossover
  Enclosure

• Accuracies: 2%RH and 3%RH

• Output Options: 0 to 5VDC, 1 to 5VDC, 0 to 10VDC, 2 to 10VDC,
  or 4 to 20mA

• Optional Temperature Sensor: RTD or thermistor

• Enclosure: BAPI-Box Crossover with hinged cover and green power
  indication LED

• IP Rating: IP44

Product Usage Instructions

Mounting

1. Mount the sensor at least three duct diameters away from
humidifiers in the center of the duct wall.

2. Drill a 1-inch hole for the probe in the duct.

3. Use two number 8 sheet metal screws to attach the sensor to
the duct.

4. Center the probe in its mounting hole ensuring that the foam
seals the hole properly without over-tightening the screws.

Wiring and Termination

1. Use twisted pair wiring of at least 22AWG with sealant-filled
connectors for all wire connections.

2. Ensure compliance with National Electric Code (NEC) and local
codes for all wiring.

3. Do not run the device’s wiring in the same conduit as AC
power wiring or highly inductive loads.

4. Wire the product with power disconnected and follow proper
supply voltage, polarity, and wiring connections as per the
provided tables.

FAQ

Q: Can I use larger gauge wire for long runs?

A: Yes, larger gauge wire may be required for long runs to
ensure proper functionality.

Q: What should I do if I experience fluctuating signal

levels?

A: If you experience fluctuating signal levels, ensure that the
device’s wiring is not running in the same conduit as AC power
wiring or highly inductive loads. If issues persist, contact your
BAPI representative for assistance.

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52432_ins_BBX_Humidity_Duct

Duct Humidity Sensor with BAPI-Box Crossover Enclosure and Optional Temperature Sensor
Installation & Operations
rev. 08/05/24

Overview and Identification

The Duct Humidity Sensors in the BAPI-Box Crossover enclosure come in 2%RH and 3%RH accuracies with a 0 to 5, 1 to 5, 0 to 10 or 2 to 10VDC output or a loop powered 4 to 20mA output. They are available with an optional RTD or thermistor temperature sensor. The BAPI-Box Crossover enclosure has a hinged cover for easy termination and carries an IP44 rating with a knockout plug in the open port. It includes a green power indication LED visible through the cover.
This instruction sheet is specific to units with the BAPI-Box Crossover Enclosure. For other enclosures, please refer to the BAPI website or contact you BAPI representative.

Fig. 1: Duct sensor with BAPI-Box Crossover enclosure.
Mounting
Mount at least three duct diameters from humidifiers in the center of the duct wall. Drill a 1 inch hole for the probe in the duct and use two number 8 sheet metal screws to attach the sensor to the duct. Center the probe in its mounting hole. Be sure that the foam seals the hole, but do not over tighten the screws.

Fig. 2: Duct unit mounting.

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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Duct Humidity Sensor with BAPI-Box Crossover Enclosure and Optional Temperature Sensor

52432_ins_BBX_Humidity_Duct

Installation & Operations
rev. 08/05/24

Wiring and 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 will void the warranty.

Table 1: Humidity Transmitter with 4 to 20mA Output

Wire Color Purpose

Note

White

Not Used

Not Used

Black

Humidity Output 4 to 20mA, To Analog Input of Controller

Red

Power

7 to 40VDC

Table 3: Humidity Transmitter with 0 to 10 or 2 to 10VDC Output

Wire Color Purpose

Note

White

Humidity Output 0 to 10 or 2 to 10VDC, To Analog Input of

Controller

Black

GND (Common) Ground for Power and Humidity Output

Red

Power

13 to 40VDC or 18 to 32VAC

Table 4: Temperature Sensor Lead Wire Colors

Thermistors

Platinum RTDs – 2 Wire

1.8K

Orange/Red

100

Red/Red

2.2K

Brown/White

1K

Orange/Orange

3K

Yellow/Black

Nickel RTD

3.25K

Brown/Green

1K

Green/Green

3.3K

Yellow/Brown

Silicon RTD

10K-2

Yellow/Yellow

2K

Brown/Blue

10K-3

Yellow/Red

Platinum RTDs – 3 Wire

10K-3(11K) Yellow/Blue

100

Red/Red/Black*

20K

White/White

1K

Orange/Orange/Black*

47K

Yellow/Orange *In the 3-Wire RTD sensors listed above,

50K

White/Blue

the two wires of similar color are

100K

Yellow/White

connected together.

Additional sensors are available so your sensor may not be listed on this table.

NOTE: BAPI’s ±2% and ±3% humidity transmitters ARE polarity sensitive as well as reverse polarity protected.

Table 2: Humidity Transmitter with 0 to 5 or 1 to 5VDC Output

Wire Color Purpose

Note

White

Humidity Output 0 to 5 or 1 to 5VDC, To Analog Input of

Controller

Black

GND (Common) Ground for Power and Humidity Output

Red

Power

7 to 40VDC or 18 to 32VAC

Fig. 7: Wiring Diagram

Humidity Output & Power
See Tables 1, 2 & 3 above for Wiring Information

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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Duct Humidity Sensor with BAPI-Box Crossover Enclosure and Optional Temperature Sensor

52432_ins_BBX_Humidity_Duct

Installation & Operations
rev. 08/05/24

Filter Care
A sintered filter protects the humidity sensor from various airborne particles and may need periodic cleaning. To do this, gently unscrew the filter from the probe. Rinse the filter in warm soapy water and rinse until clean. A nylon brush may be used if necessary. Gently replace the filter by screwing it back into the probe. The filter should screw all the way into the probe. Hand tighten only. If a replacement filter is needed, call BAPI.
BA/HDOFS3: Stainless Steel Sintered Filter Replacement for Outside Air Units

Humidity Diagnostics
Possible Problems: Unit will not operate

Possible Solutions:
– Check for proper supply power. (See page 2 for wiring diagram and power specifications)

Humidity output is at its maximum

– Make sure the humidity sensor is wired properly.
– Verify humidity with a reference sensor. If humidity drops to 5% or below in the environment, the output will go to the maximum value.

Humidity output is at its minimum – Make sure the humidity sensor is wired properly.

Humidity reading in controller’s
software appears to be off by more than the specified accuracy

Output 4 to 20mA 0 to 5VDC 1 to 5VDC 0 to 10VDC 2 to 10VDC

Humidity Formula %RH =(mA-4)/0.16
%RH = V/0.05 %RH = (V-1)/0.04
%RH = V/0.1 %RH = (V-2)/0.08

– Check all software parameters
– Determine if the sensor is exposed to an external air source different from the intended measured environment or reference device.
– Check the Humidity transmitter output against a calibrated reference such as a 2% accurate hygrometer. Measure the humidity at the sensor’s location using the reference meter, then calculate the humidity transmitter output using the humidity formula at left. Compare the calculated output to the actual humidity transmitter output (see the wiring diagram on page 2 for the humidity transmitter output wire colors). If the calculated output differs from the humidity transmitter output by more than 5%, contact BAPI technical support.

Temperature Diagnostics

Possible Problems:

Possible Solutions:

Controller reports Incorrect temperature

– Confirm the input is set up correctly in the controller’s software – Verify that the sensor wires are not physically shorted or open

– Check wiring for proper termination

– Measure the temperature at the temperature sensor’s location using an accurate temperature standard. Disconnect the temperature sensor wires and measure the temperature sensor’s resistance with an ohmmeter. Compare the temperature sensor’s resistance to the appropriate temperature sensor table on the BAPI website. If the measured resistance is different from the temperature table by more than 5%, call BAPI technical support. BAPI’s web site is found at www.bapihvac.com; click on “Resource
Library” and “Sensor Specs” then click on the type of sensor you have.

Humidity Output DIP Switch Note: The transmitter circuit board may have a threeposition DIP switch that controls the humidity output value. This switch is set at the factory at the time of the order. The settings of the switch are shown at right in case you want to change them in the field. Be aware that the power requirements for the unit change depending on the humidity output value. See the specifications section for power requirements.

The black square represents the switch position, i.e., the “0-5Vout” has all switches in the “off” position

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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52432_ins_BBX_Humidity_Duct

Duct Humidity Sensor with BAPI-Box Crossover Enclosure and Optional Temperature Sensor
Installation & Operations
rev. 08/05/24

Specifications
Power: 10 to 35VDC ………………… For 0 to 5 or 1 to 5VDC or 4 to 20 mA Humidity Outputs 15 to 35VDC …………………. For 0 to 10 or 2 to 10VDC Humidity Output 12 to 27VAC …………………. For 0 to 5 or 1 to 5VDC Humidity Output 15 to 27VAC …………………. For 0 to 10 or 2 to 10VDC Humidity Output
Power Consumption: 22 mA max. DC ……………. For 0 to 5 or 1 to 5VDC or 4 to 20 mA Humidity Outputs 6 mA max. DC ……………… For 0 to 10 or 2 to 10VDC Humidity Outputs 0.53 VA max. AC …………… For 0 to 5 or 1 to 5VDC Humidity Output 0.14 VA max. AC …………… For 0 to 10 or 2 to 10VDC Humidity Output
Sensor: Humidity……………………….. Capacitive Polymer Drift ……………………………. 0.5% per year Response time………………. < 5 seconds in moving air RH Linearity………………….. Negligible, factory corrected linear from 10 to 80% RH RH Hysteresis ……………… Factory corrected to <1% Opt. Temp. ……………………. Passive RTD or Thermistor
System Accuracy: 2% RH …………………………. ±2% (10 to 80% RH @ 25°C), ±3% (80 to 90% RH @ 25°C), Non-condensing 3% RH …………………………. ±3% (10 to 90% RH @ 25°C), Non- condensing Thermistor ……………………. ±0.36ºF (0.2ºC) from 32 to 158ºF (0 to 70ºC) – High accuracy units are available RTD ……………………………. ±0.55ºF (0.31ºC) @ 32ºF (0ºC) – High accuracy units are available
Filter: ……………………………. 80 micron sintered stainless steel filter
Output: Selectable via wiring detail Humidity……………………….. 0 to 5, 1 to 5, 0 to 10 or 2 to 10VDC or 4 to 20mA at 0 to 100% RH Opt. Temp. ……………………. Resistance RTD or Thermistor
Humidity Output Impedance: Current ………………………… 700@ 24VDC, Voltage drop is 10VDC (Supply Voltage DC ­ Transmitter voltage drop 10VDC) / 0.02 Amps = Max load Impedance Voltage…………………………. 10K
Probe Length: ………………… 5.3″ (13.5cm) Duct Insertion, 1″ diameter
Termination: Open wire Crimp: 18 to 26 AWG with Sealant Filled Crimp Connector (BA/SFC1000)
Wire Nut: 26 to 16 AWG with Sealant Filled Wire Nut (BA/SFC2000)
Enclosure Material & Rating: UV-resistant Polycarb., IP10, NEMA 1 (IP44 with knockout plug in open port)
Environmental Operation Range: -40 to 158ºF (-40 to 70ºC) 0% to 100% RH
Agency: CE EN 61326-1:2013 EMC (Industrial Electromagnetic Environment), RoHS

Specifications 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:sales@bapihvac.com · Web:www.bapihvac.com

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