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Temperature Sensors TD Series GENERAL INFORMATION TD Series temperature sensors from MICRO SWITCH respond rapidly to tem- perature changes, and are accurate to ±0.7(cid:176) C at 20(cid:176) C—completely inter- changeable without recalibration. They are RTD (resistance temperature detec- tor) sensors, and provide 8 (cid:86)/(cid:176) C sensitiv- ity, with inherently near linear outputs. The sensing element is a silicon chip, 0.040 × 0.050(cid:78) with a thin film resistive network pattern. The chips are individual- FEATURES TYPICAL APPLICATIONS ly laser trimmed to provide 2000 ohms (cid:49) Interchangeable without sensor-to- (cid:49) HVAC – room, duct and refrigerant nominal resistance at room temperature sensor recalibration temperature (20(cid:176) C), accurate to ±0.7(cid:176) C. Maximum er- (cid:49) Very small thermal mass for fast re- (cid:49) Motors – overload protection ror over the entire operating range of −40 sponse (cid:49) Electronic circuits – semiconductor to +150(cid:176) C (−40 to +302(cid:176) F) is ±2.5(cid:176) C. (cid:49) Air or liquid temperature sensing protection This extremely accurate trimming pro- (cid:49) Linear temperature sensitivity (cid:49) Process control – temperature regula- vides true sensor-to-sensor interchange- (cid:49) Proven thin film processing reliability tion ability without recalibration of the user (cid:49) Low cost (cid:49) Automotive – air or oil temperature circuit. (cid:49) Long term stability (cid:49) Appliances – cooking temperature (cid:49) 2000 ohms nominal resistance at 20(cid:176) C TD4A Liquid temperature sensor TD ORDER GUIDE TD4A liquid temperature sensor is a two- terminal threaded anodized aluminum Catalog housing. The environmentally sealed liq- Listing Description uid temperature sensors are designed for TD4A Liquid temperature sensor, 1.5(cid:176) threaded (3/8-24 UNF-2A) anodized simplicity of installation, such as in the aluminum housing, two six inch black insulated leads side of a truck. TD4A sensors are not TD5A Subminiature package, low cost, fast response time (TO-92) designed for total immersion. Typical re- sponse time (for one time constant) is 4 minutes in still air and 15 seconds in still MOUNTING DIMENSIONS(for reference only) water (unmounted position). The temper- ature rise is 0.12(cid:176) C/milliwatt suspended TD5A by leads in still air, and 0.08(cid:176) C/milliwatt when mounted on 1 square foot 0.25(cid:78) thick aluminum foil. T TD5A Miniature temperature sensor e m The TD5A is a subminiature temperature p sensor with three leads (center not con- e r nected). It has response times of 11.0 sec- a t u onds and a temperature rise of .23(cid:176) C per r e milliwatt in still air. TD4A Center lead not connected Honeywell(cid:49) Sensing and Control(cid:49)1-800-537-6945 USA(cid:49)(cid:70)1-815-235-6847 International(cid:49)1-800-737-3360 Canada 83

Temperature Sensors TD Series ABSOLUTE MAXIMUM RATINGS Linearity ±2% (−25 to 85(cid:176) C) Operating temperature range −40 to +150(cid:176) C (−40 to +302(cid:176) F) ±3% (−40 to 150(cid:176) C) Storage temperature range −55 to 165(cid:176) C (−67 to +338(cid:176) F) TD sensors can be linearized to within Voltage10 VDC Continuous (24 hours) ±0.2%. INTERCHANGEABILITY (with 100 mA maximum current) Repeatability ±1(cid:86) Temperature Resistance (Ohms) Temperature Resistance (Ohms) −40(cid:176) C (−40(cid:176) F) 1584 ±12 (1.9(cid:176) C) +60(cid:176) C (140(cid:176) F) 2314 ±9 (1.1(cid:176) C) Figure 1 −30(cid:176) C (−22(cid:176) F) 1649 ±11 (1.7(cid:176) C) +70(cid:176) C (158(cid:176) F) 2397 ±10 (1.2(cid:176) C) TD Series Resistance vs Temperature −20(cid:176) C (−4(cid:176) F) 1715 ±10 (1.5(cid:176) C) +80(cid:176) C (176(cid:176) F) 2482 ±12 (1.4(cid:176) C) −10(cid:176) C (14(cid:176) F) 1784 ±9 (1.3(cid:176) C) +90(cid:176) C (194(cid:176) F) 2569 ±14 (1.6(cid:176) C) 0(cid:176) C (32(cid:176) F) 1854 ±8 (1.1(cid:176) C) +100(cid:176) C (212(cid:176) F) 2658 ±16 (1.8(cid:176) C) +10(cid:176) C (50(cid:176) F) 1926 ±6 (0.8(cid:176) C) +110(cid:176) C (230(cid:176) F) 2748 ±18 (2.0(cid:176) C) +20(cid:176) C (68(cid:176) F)2000 ±5 (0.7(cid:176) C) +120(cid:176) C (248(cid:176) F)2840 ±19 (2.0(cid:176) C) +30(cid:176) C (86(cid:176) F) 2076 ±5 (0.7(cid:176) C) +130(cid:176) C (266(cid:176) F) 2934 ±21 (2.2(cid:176) C) +40(cid:176) C (104(cid:176) F) 2153 ±6 (0.8(cid:176) C) +140(cid:176) C (284(cid:176) F) 3030 ±23 (2.4(cid:176) C) +50(cid:176) C (122(cid:176) F) 2233 ±7 (0.9(cid:176) C) +150(cid:176) C (302(cid:176) F) 3128 ±25 (2.5(cid:176) C) It is recommended that resistance measurements be made at 100 (cid:109)A or less to minimize internal heating of the sensor. Measurements at currents up to 1mA will not damage the sensor, but the resistance characteristics should be adjusted for internal heating. Equation for computing resistance: RT(cid:74)RO+(3.84 ×10-3×RO×T) +(4.94 ×10-6×RO×T2) RT(cid:74)Resistance at temperature T ELECTRICAL INTERFACING RO(cid:74)Resistance at 0(cid:176) C The high nominal resistance, positive T (cid:74)Temperature in (cid:176) C temperature coefficient and linear sensi- tivity characteristics of the TD Series tem- Figure 2 perature sensors simplifies the task of de- Linear Output Voltage Circuit signing the electrical interface. Figure 2 is a simple circuit that can be used to linea- rize the voltage output to within 0.2% or a ±0.4(cid:176) C error over a range of −40(cid:176) to +150(cid:176) C (−40(cid:176) to +302(cid:176) F). In some applications, it may be desirable to detect one particular temperature. Fig- ure 3 illustrates one way this can be ac- complished. In the comparator circuit shown, the potentiometer can be adjust- ed to correspond to the desired temper- ature. Figure 3 Adjustable Point (Comparator) Interface 84 Honeywell(cid:49) Sensing and Control(cid:49)1-800-537-6945 USA(cid:49)(cid:70)1-815-235-6847 International(cid:49)1-800-737-3360 Canada