BAPI BA-H200-D-BB Duct or Outside Air Humidity Transmitter Instruction Manual

BAPI BA-H200-D-BB Duct or Outside Air Humidity Transmitter

Overview

The Duct and Outside Air humidity transmitters come in both ±2%RH and ±3%RH accuracies and transmit a 0 to 10V or 2 to 10V signal proportional to the relative humidity. They can have an optional RTD or thermistor temperature sensor mounted for use by any automation controller. They are powered from a 15 to 35VDC or a 15 to 27 VAC power source. The transmitters are housed in either a Weatherproof (WP), BAPI-Box (BB) or BAPI-Box 2 (BB2) Enclosure.

Duct Unit Mounting

Mount at least three (3) duct diameters from humidifiers in the center of the duct wall. Drill a 1” 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, do not over-tighten the screws.

Outside Air Mounting

Mount in a permanently shaded area away from windows and doors. Do not mount in direct sunlight. Mount with the sensor probe pointing down. Drill a hole large enough for your sensor cable to go through your mounting surface. Mount the unit with the wiring knock-out centered over the wiring hole. Pull the wiring into the unit and terminate using sealant-filled connectors. Best practice is to seal the wiring hole with caulk after the wiring is installed. Be sure that the foam on the back of the unit makes a good weather-tight seal.

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, 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 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.

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

Specifications

Power:

• 15 to 35 VDC, 6mA max
• 15 to 27 VAC, 0.14VA max
• Sensor: Factory corrected @17 RH points (10 to 90% RH)
• Humidity…………………….Capacitive Polymer
• RH Accuracy ……………..±2% @ 73°F (23°C) from 10 to 90%
• Drift ………………………….0.5% per year
• Response time……………< 5 seconds in moving air
• RH Linearity………………. Negligible, factory corrected linear from 10 to 90%
• RH Hysteresis ………….. Factory corrected to <1%
• Opt. Temp………………….Passive RTD or Thermistor
• Filter: 80 microns sintered stainless steel filter
• Calibrated Accuracy: Calibration @17 RH points, (10% to 90%)
• RH 2% ………………………2% from 10 to 90% @ 73°F (23°C), Non-condensing
• RH 3% ………………………3% from 10 to 95% @ 73°F (23°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
• Output: Selectable via wiring detail
• Humidity…………………….0 to 5VDC or 4 to 20mA at 0 to 100% RH
• Opt. Temp………………….Resistance RTD or Thermistor

Humidity Output Impedance:

• Current ……………………..700Ω@ 24VDC, the Voltage drop is 10VDC
• (Supply Voltage DC – Transmitter voltage drop 10VDC) / 0.02 Amps = Max load Impedance
• Voltage………………………10KΩ

Probe Length:

• Duct ………………………….5.3” (13.5cm) Duct Insertion, 1” diameter
• Outside Air…………………2.4” (6.1cm) Below Enclosure, 1” diameter
• Dimensions: W x H x D
• Weatherproof (WP) …….2.75” x 4.5” x 2.2”, (70 x 114 x 55 mm)
• BAPI-Box (BB) …………..4.15” x 5” x 2.5”, (105.4 x 127 x 63.5mm)
• BAPI-Box 2 (BB2) ………4.9” x 2.8” x 2.35”, (124.8 x 71.6 x 59.7mm)
• Termination: Open wire
• Crimp ……………………….18 to 26 AWG with Sealant Filled Crimp Connector (BA/SFC1000-x00)
• Wire Nut…………………….26 to 16 AWG with Sealant Filled Wire Nut (BA/SFC2000-x00)

Enclosure Material:

• Weatherproof (WP)……..Cast Aluminum
• BAPI-Boxes (BB, BB2)..Polycarbonate, UV resistant

Enclosures Ratings:

• Weatherproof (WP)……..NEMA-3R
• BAPI-Boxes (BB, BB2)..NEMA-4, IP66, UL94V-0
• Environmental Operation Range: -40º to 158ºF (-40º to 70ºC) • 0% to 100% RH
• Approvals: RoHS

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 Possible Solutions:

• The unit will not operate Check for proper supply power. (See page 2 for wiring diagram and power specifications)
• Humidity output is at its maximum value of 10V 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 value of 0V or 2V Make sure the humidity sensor is wired properly.
• Check all software parameters
• Determine if the sensor is exposed to an external air source different from the intended measured environment or reference device.
• Humidity reading in controller’s software appears to be off by more than the specified accuracy 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 4% to 5%, contact BAPI technical support

Temperature Diagnostics

Possible Problems Possible Solutions:

• The 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 website is found at www.bapihvac.com; click on the “Resources” then “BAPI Sensors Overview” and then click on the type of sensor you have.

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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