BAPI AD592, LM334, AD592-10K, LM334-10K Catalog Page
AD592/LM334/AD592-10K/LM334-10K Room Sensors
Sensor Termination and Troubleshooting
9557_ins_592_Room
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 class1 or 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 does not recommend wiring the sensor with power applied as accidental arcing may damage the product
and will void the warranty.
rev.
8/22/12
AD592/LM334 (2 Wire) sensors
1. Install a 10K 0.1% resistor between the sensor
Output (terminal 2) and Ground (GND).
2. Make sure that the resistor is connected between the analog input (A.I.) point and Ground.
3. Connect the sensor Output to the A.I. point.
4. Connect the 5 to 30 VDC wire last.
AD592-10K/LM334 (3 Wire) sensors
1. All AD592-10K/LM334-10K (3 wire) sensors
have a 10K 0.1% resistor built in.
2. Connect the Ground (terminal 3) wire first.
3. Connect the Sensor Output wire second.
4. Connect the 5 to 30 VDC wire last.
Sensor Termination
Pin 1..... Power
To Controller power output or auxiliary supply
Pin 2..... Current Output for 2-wire
Voltage Output for 3-Wire
To Analog Input of Controller
Fig 1:
Semiconductor Room Board
Pin 3..... Shorted to Pin 2 for 2-wire
Ground for 3-wire
To Controller Ground 3-Wire ONLY
Specifications subject to change without notice.
AD592/LM334/AD592-10K/LM334-10K Room Sensors
Sensor Termination and Troubleshooting
8/22/12
9557_ins_592_Room
Theory of Operation
The AD592/LM334 sensor is a two terminal integrated-circuit temperature sensor. The AD592/LM334 provides an
output current directly proportional to absolute temperature. When the temperature of the AD592/LM334 sensor
changes one-Kelvin (one -degree Celsius), then the current through the AD592/LM334 changes by 1uAmp. 77°
Fahrenheit (25° Celsius) is 298.2 Kelvins and the output current from the AD592/LM334 sensor is 298.2uAmp.
Initial accuracy of the AD592/LM334 temperature sensor is ± 8.1° Fahrenheit (± 4.5° Celsius) at 77° Fahrenheit (25°
Celsius).
Since most meters that field technicians use cannot accurately measure currents this low, BAPI recommends that
a 10K 0.1% resistor be placed between the sensor
output and ground. The 10K resistor changes the
current into a voltage that varies 0.01 volts per one degree
Celsius temperature change; the voltage at 77°F is 2.982
VDC. Resistors with other tolerances can be used, but
you will have greater temperature uncertainty, see the
10K uncertainty table;
BAPI provides two styles of room sensor with an AD592/LM334 sensor, one with and one without the 10,000 ohm
0.1% resistor. The one with the resistor has three terminals - 1 is power, 2 is sensor output (1mV/°K) and 3 is
Ground. The one without the resistor has two terminals - 1 is power and 2 is sensor output (1uAmp/°K).
10K Uncertainty Table
Tolerance Tempera ture Uncertainty
0.10% ±8.64°F
1% ±13.47°F
5% ±34.93°F
rev.
Offsetting
All BA592 sensors will have the following information provided on a label:
Therm Reading_______
The actual temperature reading
according to a thermometer that is
certified traceable to recognized
standards by the National Institute of
Standards and Technology (NIST).
To correct the Sensor Reading, simply add the offset value to the sensor reading so that it equals the thermometer
reading.
e.g. Therm Reading 74.6 Sensor Reading 73.0 Offset +1.6
Correction: Add (+1.6) °F to the sensor for an accurate reading: 73 + 1.6 = 74.6°F
e.g. Therm Reading 75.4 Sensor Reading 77.2 Offset -1.8
Correction: Add (-1.6) °F to the sensor for an accurate reading: 77.2 + (-1.8) = 75.4°F
Sensor Reading ______
The temperature reading according to
the AD592/LM334 sensor, using the
output in either mA or mV and
converting the output to a Fahrenheit
temperature.
Offset_______
The difference between the
Thermometer Reading and the
Sensor Reading
Specifications subject to change without notice.
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