BAPI Outside Air Humidity Sensor User manual

Brand: BAPI

Model: Outside Air Humidity Sensor

Type: User manual

BAPI Outside Air Humidity Sensor accurately measures and transmits relative humidity levels in outdoor environments. Designed for durability, it features a solid-state AD592 or LM334 semiconductor temperature sensor, ensuring precise readings in a wide temperature range. The sensor's compact size and easy installation make it ideal for monitoring humidity levels in various applications, including HVAC systems, greenhouses, and weather stations.

Installation and Operating Instructions

Duct or Outside Air Humidity Transmitter Units

with AD592 or LM334 Semiconductor Temperature Sensor

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

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rev. 09/20/21

Overview

The duct and outside air humidity transmitters with a solid state AD592 or LM334 semiconductor temperature sensor

come with ±2% or ±3%RH accuracy and can be ordered with a Weatherproof (WP), BAPI-Box (BB), or BAPI-Box 2 (BB2)

Enclosure. The humidity transmitter is available with either 4 to 20 mA, 0 to 5V, 0 to 10V or 2 to 10V output.

Duct Unit Mounting

Mount at least 3 duct diameters from humidiers 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.

Fig. 4: Outside

Humidity in a

Weatherproof

(WP) Enclosure

Fig. 5: Outside

Humidity in a

BAPI-Box (BB)

Enclosure

Fig. 6:

Outside

Humidity in a

BAPI-Box 2

(BB2) Enclosure

Fig. 3: Duct

Humidity in a

BAPI-Box

2 (BB2)

Enclosure

Outside Air Mounting

Fig. 2: Duct

Humidity in a

BAPI-Box (BB)

Enclosure

Mount in a permanently shaded area away from windows and doors. Do not mount in direct sunlight. Mount with the

sensor probe pointed down. Drill a hole large enough for your sensor cable through your mounting surface. Mount the

unit to the surface with the wiring knock out centered over the wiring hole. Pull the wiring into the unit and terminate using

sealant lled 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.

Fig. 1: Duct

Humidity in a

Weatherproof

(WP) Enclosure

Installation and Operating Instructions

Duct or Outside Air Humidity Transmitter Units

with AD592 or LM334 Semiconductor Temperature Sensor

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

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Table 1: Humidty Transmitter with 4 to 20mA Output

Wire Color Purpose Note

White Not Used Not Used (Cap Wires)

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

Red Power 10 to 35VDC

Table 2: HumidityTransmitter with 0 to 5VDC Output

Wire Color Purpose Note

White Humidity Output 0 to 5VDC, To Analog Input of Controller

Black GND (Common) Ground for Power and Humidity Output

Red Power 10 to 35VDC or 12 to 27 VAC

Wiring and Termination

Fig. 7: Humidity Transmitter with AD592 or LM334

Semiconductor Temperature Sensor

Note: BAPI’s 2% and 3%, humidity transmitters ARE

polarity sensitive as well as reverse polarity protected.

*Note - For 2-wire 592 or 334, a 0.1% resistor must be installed between

the black output wire and the controller’s ground.

Table 5: Temperature Sensor Termination Table

AD592 or LM334 2-Wire Semiconductor- From Probe

Wire Color Purpose Note

Red Power Connect to +5 to +30 VDC

Black Temperature Output Connect to Controller’s Analog Input*

Table 6: Temperature Sensor Termination Table

AD592-10K or LM334-10K 3-Wire Semiconductor - From Probe

Wire Color Purpose Note

Red Power Connect to +5 to +30 VDC

Black GND (Common) Ground for Temperature Output

White Temperature Output Connect to Controller’s Analog Input

Humidity Output & Power,

See tables 1 through 4

above for Wiring Information

Temperature Output & Power,

See Tables 5 & 6 above for

Wiring Information.

Note: The white wire is only

present on the 3-wire units.

Table 4: Humidity Transmitter with 2 to 10VDC Output

Wire Color Purpose Note

Brown Humidity Output 2 to 10VDC, To Analog Input of Controller

Black GND (Common) Ground for Power and Humidity Output

Red Power 15 to 35VDC or 15 to 27VAC

Table 3: Humidity Transmitter with 0 to 10VDC Output

Wire Color Purpose Note

Green Humidity Output 0 to 10VDC, To Analog Input of Controller

Black GND (Common) Ground for Power and Humidity Output

Red Power 15 to 35VDC or 15 to 27VAC

BAPI recommends using twisted pair of at least 22AWG and sealant lled 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 uctuating 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 diculties, 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.

Installation and Operating Instructions

Duct or Outside Air Humidity Transmitter Units

with AD592 or LM334 Semiconductor Temperature Sensor

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

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Specications

AD592 SOLID STATE SEMICONDUCTOR SPECS

Temperature Sensor Output

Voltage.................2.83 to 3.1 VDC = 50º to 100°F

Current.................0.283 to .31 mA = 50º to 100ºF

Temp. Sensitivity: .

2 wire ...................1uA/ºC (0.556uA/ºF)

3 wire ...................10mV/ºC, (5.556mV/ºF

Reference Point: 25ºC (77ºF)

AD592 ..................298.20uA

AD592-10K ..........2.982VDC

Voltage Supply: 5VDC to 30VDC

Temp. Range: -25 to 105ºC (-13 to 221ºF)

Accuracy: With Factory oset to 0.1ºC (0.18ºF)

Raw AD592, ±3.3ºF (1.8ºC) from -13 to 221ºF

Linearity:

±0.15ºC max from 0 to 70ºC

(±0.27ºF max from 32 to 158ºF)

Repeatability: ± 0.1ºC (±0.18ºF)

Response Time: 10 seconds at the 63% step

LM334 SOLID STATE SEMICONDUCTOR SPECS

Temperature Sensor Output

Voltage.................2.83 to 3.1 VDC = 50º to 100°F

Current.................0.283 to .31 mA = 50º to 100ºF

Temp. Sensitivity: .

2 wire ...................1uA/ºC (0.556uA/ºF)

3 wire ...................10mV/ºC, (5.556mV/ºF)

Reference Point: 25ºC (77ºF)

LM334..................298.20uA

LM334-10K ..........2.982VDC

Voltage Supply: 5VDC to 30VDC

Temp. Range:

Nominal, 0 to 70ºC (32 to 158ºF), 100ºC max

Accuracy: With Factory oset to 0.1ºC (0.18ºF)

Raw LM334, ±10.8ºF (6ºC) from 32 to 212ºF

Linearity: ±0.15ºC max from 0 to 70ºC

Repeatability: ±0.1ºC (±0.18ºF)

Response Time: 10 seconds at the 63% step

Supply Power:

Units with RH Output of 4 to 20mA or 0 to 5VDC

10 to 35VDC, 22mA max

Units with RH Output of 0 to 5VDC: 12 to 27VAC, 0.53VA max

Units with RH Output of 0 to 10VDC or 2 to 10VDC

15 to 35VDC, 6mA max or 15 to 27VAC, 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 linier from 10 to 90%

RH Hysteresis ..... Factory corrected to <1%

Humidity Filter: 80 micron sintered stainless steel lter

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

Humidity Transmitter Output (0 to 100%RH)

H200, H300 ..........

4 to 20mA

or 0 to 5VDC

H210, H310 .......... 0 to 10VDC

H212, H312 .......... 2 to 10VDC

Humidity Output Impedance:

Current ................. 700W @ 24VDC, Voltage drop is 10VDC

Voltage ................. 10KW

Probe Length:

Duct .................... 5.3” (13.5cm) Duct Insertion, 1” dia.

Outside Air ............ 2.4” (6.1cm) Below Enclosure, 1” dia.

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, Sealant Filled Connector (BA/SFC1000-x00)

Wire Nut: 26 to 16 AWG, Sealant Filled Wire Nut (BA/SFC2000-x00)

Enclosure Material and Rating:

Weatherproof (WP)

Cast Aluminum, NEMA-3R

BAPI-Box (BB) ......

Polycarbonate, UV resistant, NEMA-4, IP66, UL94V-0

BAPI-Box 2 (BB2) .

Polycarbonate, UV resistant, NEMA-4, IP66, UL94V-0

Environ. Ambient Range: -40º to 158ºF (-40º to 70ºC) • 0 to 100%RH

Approvals: RoHS

A sintered lter protects the humidity sensor from airborne particles and may need periodic cleaning. To do this, gently

unscrew lter from the probe. Rinse lter in warm soapy water until clean. A nylon brush may be used if necessary. Gently

replace the lter by screwing it back into the probe. The lter should screw all the way into the probe. Hand tighten only.

Filter Care

To correct the sensor reading, simply add the oset value to the sensor reading so that it equals the thermometer reading.

e.g. Therm Reading: 74.6 Sensor Reading: 73.0 Oset: +1.6

Correction: Add (+1.6) °F to the sensor at the controller for an accurate reading: 73 + 1.6 = 74.6°F

Therm Reading_______

The actual temperature reading

according to a thermometer that is

NIST certied traceable

Sensor Reading ______

The temperature reading according

to the sensor, using the output in

either uA or mV.

Oset_______

The dierence between the

Thermometer Reading and the

Sensor Reading

This is how BAPI calculates the oset value provided on the equipment label for the AD592 or LM334 Sensor:

Temperature Sensor Oset

Specications subject to change without notice.

Installation and Operating Instructions

Duct or Outside Air Humidity Transmitter Units

with AD592 or LM334 Semiconductor Temperature Sensor

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

8595_ins_hum_duct_out_592_5_20

4 of 4

rev. 09/20/21

Temperature Diagnostics

The AD592 and LM334 semiconductor sensors transform temperature into current. The output changes 1 micro-amp

for every degree Celsius (0.56 micro-amp per degree Fahrenheit). Since most meters used by eld technicians cannot

accurately measure currents this low, BAPI recommends that a 10KΩ 0.1% resistor be placed between the sensor output

and ground. The 10KΩ resistor changes the sensor output current into a voltage that varies by 0.01 volts per degree

Celsius (0.0056 volts per degree Fahrenheit). This is in the range of most meters used by eld

technicians. Resistors with other tolerances can be used, but there will be greater temperature

errors (see 10KΩ Error Table).

BAPI oers AD592 and LM334 sensors with a built-in 10KΩ 0.1% resistor from the output to

ground, or without the sensor (in which case the customer must supply and wire their own 10KΩ

resistor from the output to ground). Sensors with built-in resistors have three wires – red, black

and white. Sensors without the resistor have two wires – red and black.

If the humidity transmitter is set up for 4 to 20mA output, there is no signal ground at

the sensor to use as a reference for the voltage measurements for the two-wire AD592

or LM334 temp sensors. The ground pin at a local power plug may be at the correct

potential or you may have to pull a temporary ground wire from the controller to make

the measurements. There will be a ground in the 3-wire AD592 or LM334 sensors.

1. Check for proper supply voltage from the sensor’s red power lead (+5 to +30 VDC)

to the controller’s ground.

2. For 2-wire units, make sure that there is a 10KΩ 0.1% resistor from the sensor’s

black wire to the controller’s ground.

3. To verify sensor operation, measure the mV from the 2-wire sensor’s black wire

to the controller’s ground, or from the 3-wire sensor’s white wire to the black wire.

Compare the voltage measurement to the voltage listed in the AD592 or LM334

Output Table. Note: Be sure to include the error from the10KΩ Error Table.

4. If the sensor reads within 0.05 VDC of the table, then it is operating properly. In this

case, verify that the controller is operating correctly. If the sensor o by more than

0.05 VDC, call BAPI technical support.

5. Determine if the sensor is exposed to an external source dierent from the

intended room environment.

°F °C

Output

Current uA

Output Voltage

across 10KΩ

50 10 283.2 2.832

60 15.56 288.8 2.888

62 16.67 289.9 2.899

64 17.78 291 2.91

66 18.89 292.1 2.921

68 20 293.2 2.932

70 21.11 294.3 2.943

72 22.22 295.4 2.954

74 23.33 296.5 2.965

76 24.44 297.6 2.976

77 25 298.2 2.982

78 25.56 298.8 2.988

80 26.67 299.9 2.999

82 27.78 301 3.01

84 28.89 302.1 3.021

86 30 303.2 3.032

88 31.11 304.3 3.043

90 32.22 305.4 3.054

100 37.78 311 3.11

AD592 or LM334 Output Table

592 or 334 Semiconductor

Temperature

10KΩ Resistor Error Table

10KΩ

Resistor

Tolerance

Temperature

Inaccuracy

0.10% ±3.3°F/1.8°C

1% ±8.3°F/4.6°C

5% ±30.7°F/17.1°C

Humidity Diagnostics

Possible Problems:

Unit will not operate

Humidity output is at its maximum

or minimum value

Humidity reading in controller’s

software appears to be o by

more than the specied accuracy

Possible Solutions:

- Check for proper supply power. (See wiring diagram and power specs.)

- Make sure the humidity sensor is wired properly.

- If the output is at its maximum value, verify the humidity in the environment with

a reference sensor. If the humidity drops to 5% or below in the environment, the

output will go to the maximum value.

- Check all software parameters

- Determine if the sensor is exposed to an external air source dierent from the

measured environment, such as air inltration through the wiring conduit.

- 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 for the humidity transmitter output wire colors). If the

calculated output diers from the humidity transmitter output by more than 4% to

5%, contact BAPI technical support.

Output Humidity Formula

4 to 20mA %RH =(mA-4)/0.16

0 to 5VDC %RH = V/0.05

0 to 10VDC %RH = V/0.1

2 to 10VDC %RH = (V-2)/0.08

BAPI Outside Air Humidity Sensor User manual

Brand: BAPI

Model: Outside Air Humidity Sensor

Type: User manual

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BAPI Outside Air Humidity Sensor User manual

BAPI Outside Air Humidity Sensor User manual

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