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Temperature RTD Meters, Introduction / Handheld
KEY INFORMATION
Tech Insights Resistance Temperature Detectors (RTDs) measure temperature by measuring the change in electrical resistance across a metal wire. Why Choose an RTD?
Two Wire
RTDs are more accurate and stable than thermocouples, but cannot be used to measure extremely high temperatures. Compared to thermistors, RTDs are more rugged and can measure higher temperatures. While the RTD wire can be made of any metal, platinum is the metal of choice due to its excellent repeatability, stability, and resistance to corrosion and chemicals. Platinum RTDs are available in 100, 200, 500, and 1000 Ω (nominal values at 0°C)—with the 100 Ω being the most popular. Differences Between Two-, Three-, and Four-Wire Configurations
Select the three-wire configuration when there is a significant distance between the sensor and the receiver. Although the accuracy is less than that of a four-wire configuration, it is sufficient for most industrial applications. The four-wire configuration offers the most accurate measurement. One pair of leads provides the excitation current to the RTD while the other pair measures the voltage across it.
RED ELEMENT
Three Wire
BLACK BLACK
R1
R3 R2
RE ELEMENT
Four Wire
BLACK BLACK
R1
R4 R3
RE RED RED ELEMENT
R2 R1
Splashproof sealed membrane keypad makes cleanup easy
Ultra-thin cable lets you measure within doored equipment For use in remote measurement applications NIST-traceable This meter has a 10-ft ribbon micro-cable that allows you to place the probe within an area and close the door without affecting the probe or the door seal. Accurately monitor temperature within freezers, water baths, heating blocks, incubators, refrigerators, and other areas. The fastresponse, 100 Ω platinum RTD probe can be used in liquids, air/gas, or frozen material. Magnetic strips and 86460-06 adjustable probe holder are provided for mounting of both thermometer and probe. ■ ■
What’s included: probe, probe holder, NIST-traceable calibration report supplied by manufacturer, mounting strips, carrying case, and 9 V battery.
Probe 100 Ω RTD (included)
■ Displays
minimum and maximum readings boot with built-in stand included This thermometer offers the high accuracy of RTDs at an economical price. Features hold function that freezes measurement, °F/°C selection, auto-off function, low-battery indication and can Thermometer be field-calibrated. includes Accepts one RTD protective probe with Digirubber boot. Sense® three-pin connector, sold Model 35626-20 separately below. shown with probe What’s included: 08117-70 protective rubber (sold separately). boot and four AAA batteries. ■ Protective
Specifications
Clip-on probe holder
Specifications Resolution: 0.1°C Accuracy: ±2°C Display: 4-digit LCD, 1" (2.5 cm) H Power: one 9 V battery (included)
Battery life: >100 hours Dimensions (W x H x D): 2¾" x 4¼" x ¾" (7.0 x 10.8 x 1.9 cm)
Resolution: 0.1°F (0.1°C) Accuracy: ±0.4°F (±0.2°C) Display: LCD, 7⁄8" (2.2 cm) H Power: four AAA batteries (included) Catalog number Thermometer
Range (–99 to 199°C)
Price
Battery life: >200 hours Low-battery indicator: yes Dimensions (W x H x D): 23⁄4" x 51⁄2" x 11⁄2" (7.0 x 14.0 x 3.8 cm)
Probe
100 Ω RTD with 3-pin connector (not included) Precalibrated thermometer 100 Ω RTD with 3-pin TW-85000-02 connector (not included) TW-35626-20
TW-09376-04 Replacement batteries, 9 V. Pack of 4 TW-17002-04 NIST-traceable recalibration with data for RTD system (meter and probe)
1724
R2
Acorn® RTD Thermometer
Remote-Monitoring
RTD Thermometer
BLACK
RE
RED
The two-wire configuration is good for any application where the sensor is connected directly to the receiver to prevent lead length resistance errors.
Catalog number TW-86460-06
RTD Wire Configuration
Range –320 to 1562°F (–200 to 850°C) –320 to 1562°F (–200 to 850°C)
TW-35626-60 Oakton RTD probe; 316 SS with 5-ft (1.5-m) cable TW-08117-70 General-purpose RTD probe with integral handle, 10" (25.4 cm) L; –58 to 932°F (–50 to 500°C) TW-35606-80 Replacement protective rubber boot TW-17002-04 NIST-traceable calibration with data for RTD system (meter and probe)
US Toll-free: 800-323-4340 • Outside the US: 1-847-549-7600 • www.coleparmer.com Canada 800-363-5900 • India 91-22-6716-2222 • UK 0500-345-300
Price
