BAPI RTD Sensor Overview

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Building Automation Products, Inc.,
Tel: +1-608-735-4800
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BAPI RTD OVERVIEW

RTD Description

BAPI RTDs (Resistance Temperature Detectors) are thermally sensitive resistive elements that exhibit a small change in resistance per degree of temperature change. RTDs are especially recognized for excellent linearity throughout their temperature range with a high degree of accuracy and repeatability. An example of an RTD output curve can be seen in Figure 2.
RTDs supplied in BAPI products feature a standard interchangeability tolerance of ±0.3 °C measured at 0 °C. Higher accuracy sensors are also available. The Class A line has an interchangeability tolerance of ± 0.15 °C measured at 0 °C. Please call for availability and pricing on Class A RTDs. Whether standard or Class A, BAPI RTDs have such a high accuracy that they can be interchanged without the expense of offsetting the controller.
Most RTD sensing elements can be packaged to withstand an extremely broad temperature range (-200 to 600°C). For most purposes, the standard operating range should be sufficient, but we also have RTDs designed for applications where a higher or lower operating temperature range is required. BAPI offers 1 k Ohm Platinum RTDs with the ranges shown in the table at right.

RTD Specifications

Definition of Specification Terms

Tolerance of Resistance (Accuracy)
The maximum amount any RTD will differ from the standard resistance curve.

Stability (drift)
The amount that the resistance characteristics of a RTD will change over time under certain conditions.

Standard & Extreme Temperature Ranges for the 1K Platinum RTD
When ordering a sensor with one of these “extreme” temperature ranges, simply include the number in parentheses ( ) after the sensor type. For example, a BA/1K(2) is a 1 K Ohm RTD with an operating range of 100 to 210°C.
Range	°C	°F
Standard	-60 to 150	-76 to 302
Low Temp (1)	-200 to 0	-328 to 32
High Temp (2)	100 to 210	212 to 410
Very High Temp (3)	200 to 600	-392 to 1,112

RTD Specifications
Tolerance of Resistance (Accuracy): Single Point: Standard 0.12% at 0 °C Single Point: Class A 0.06% at 0 °C Averaging: 0.2% at 0 °C Tolerance in °C: Standard: ±(0.3 + 0.005T); T= Temp in °C Class A: ±(0.15 + 0.002T); T= Temp in °C Averaging: ±(0.5 + 0.005(T-25)); T= Temp in °C Stability (drift): 0.14 °C with 6,000 continuous hours at 400 °C Standardization: DIN 43760-1980, IEC Pub 751-1983, JIS C1604-1989
Sensor Type	Reference Resistance	Temp. Coefficient	Operating Range
100 Ohm	100 Ohms @ 0 °C	.385 Ohms/°C	-60 to 150 °C
100 (3W) 3 Wire	100 Ohms @ 0 °C	.385 Ohms/°C	-60 to 150 °C
1K(375)	1K Ohms @ 0 °C	3.75 Ohms/°C	-60 to 150 °C
1K	1K Ohms @ 0 °C	3.85 Ohms/°C	-60 to 150 °C
1K(Ni) Nickel	1K Ohms @ 21 °C	5.68 Ohms/°C	-60 to 200 °C
2K	2K Ohms @ 20 °C	8 Ohms/°C	-60 to 150 °C