HVAC/R Sensors
Company Overview
Catalog/Price Book
Instruction Sheets
Ordering & Shipping
BAPI Distributor List
Contact Us
Building Automation Products, Inc.,
Tel: +1-608-735-4800
Fax: +1-608-735-4804
Copyright © 2007 BAPI
Semiconductor Description
BAPI semiconductors are designed to exhibit a defined current output directly proportional to the absolute temperature (°K). This property makes them the most linear of all the common commercial HVAC sensing elements. By putting this current output across a resistor, a proportional output voltage is produced. An example of a semiconductor output curve can be seen in Figure 3.
The AD592 semiconductor temperature sensor supplied with BAPI products provides a two wire 248 to 378 micro amp output or a three wire 2.48 to 3.78 volt output over a range of -13 to 221 °F (-25 to 105 °C). These units are offset using equipment traceable to the National Institute of Standards and Technology (NIST). Each unit is then labeled with the actual temperature and the corresponding offset.
Definition of Specification Terms
Interchangeability Tolerance (Accuracy)
The maximum amount that sensors following the same curve will differ from each other.
Repeatability
A measure of a sensor’s ability to repeat the same output value for a given input value.
Semiconductor Specifications
Offset to 0.18 °C (0.1 °F) - NIST Traceable
Linearity:
± 0.15 °C max from 0 to 70 °C, (± 0.27°F max from 32 to 158°F)
Repeatability:
± 0.10 °C (± 0.18°F)
Sensor Range:
(-25 to 105 °C), (-13 to 221 °F), (248 to 378 °K)
Temperature Coefficient:
2 wire 1 µA/°C (0.556 mA/°F) [1 µA/°K]
3 wire 10 mV/°C (5.556 mV/°F) [10 mV/°K]