1. www.hvac.vn Temperature Sensors The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential customers and current employees as a resource only. They may not be reproduced, published, or transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness, product names, and logos, included within these compilations may not be used without specific, written prior permission from Dwyer Instruments, Inc. ©Copyright 2014 Dwyer Instruments, Inc.

2. www.hvac.vn Overview TE – Temperature Sensor BTT – Temperature Transmitters

3. www.hvac.vn TE - Introduction Duct and immersion temperature sensor Uses a thermistor or RTD for temperature sensing

4. www.hvac.vn TE - Key Specifications Accuracy: Thermistor temperature sensor: ±0.2°C @ 25°C (±0.36°F @ 77°F); RTD temperature sensor: DIN class A: ±0.15°C @ 0°C (±0.28°F @ 32°F). Temperature Limits: Operating: -40 to 302°F (-40 to 150°C) Housing Material: Meets UL, 94 V-O polycarbonate plastic Housing Rating: NEMA 4X (IP66) (DFW, IBW only)

5. www.hvac.vn TE - Technology Thermistor Type of resistor whose resistance varies significantly with temperature Material is typically a ceramic or polymer Compared to RTDs, which use pure metals Two types: NTC (negative thermal coefficient) – resistance decreases with increasing temperature PTC (positive thermal coefficient) – resistance increases with increasing temperature

6. www.hvac.vn TE - Technology RTD Consist of a fine coiled wire wrapped around a glass or ceramic core Typically made of pure material such as platinum, nickel or copper Material has a very predictable change in resistance in response to temperature

7. www.hvac.vn TE – RTDs vs. Thermocouples RTD/Thermistors: Very high accuracy and repeatability Can maintain stability for many years, while thermocouples can drift within the first few hours of use Thermocouples: More suitable for temperatures above 600° C Faster response time (fractions of a second vs. seconds) Can be much smaller than RTDs and thermistors

8. www.hvac.vn TE - Applications Used to monitor air or water temperature throughout a building management system or an air handler unit Immersion sensors which are supplied with compression fittings are typically used to monitor the hot or chilled water lines throughout a building

9. www.hvac.vn BTT - Introduction Includes duct, immersion, and outside air mounting configurations Outside air models can be ordered with or without a radiation shield Stainless steel thermowells are available for immersion models Uses a Pt1000 RTD temperature sensor

10. www.hvac.vn BTT - Key Specifications Wetted Material: 304 SS, polycarbonate, and neoprene (nylon and silicone for outside air models) Enclosure Rating: NEMA 4X (IP66) Probe Length: 2.5 to 18 inches (63.5 to 457mm) Temperature Limits: 32 to 122°F (0 to 50°C) Response Time: 100 msec Agency Approvals: CE

11. www.hvac.vn BTT - Applications Monitoring the temperature inside air ducts for HVAC Transmitting temperature inside water lines for chillers Measuring the outside air temperature of any new or existing facility