Catalogue - Sensor catalog - Watlow - (Version JPG)

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RTD, Thermocouple cable, Thermocouple, Heating element, Temperature controller

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General Information

Application Hints Resistance Temperature Detectors—RTDs

What is the initial accuracy Table of Tolerance Values


of temperature sensors?		Resistance	Tolerance DIN-IEC-751
(Continued)	Temperature	Value	Class A		Class B
(Continued)		Q	°C (Q)		°C (Q)
Generally speaking, if accuracy is	-200	18.52	±0.55	(±0.24)	±1.3	(±0.56)
your most important concern and the	-100	60.26	±0.35	(±0.14)	±0.8	(±0.32)
application temperature is between	0	100.00	±0.15	(±0.06)	±0.3	(±0.12)
140°C and 650°C (284°F and	100	138.51	±0.35	(±0.13)	±0.8	(±0.30)
1202°F), RTDs are probably the best	200	175.86	±0.55	(±0.20)	±1.3	(±0.48)
choice. Three-wire is the most	300	212.05	±0.75	(±0.27)	±1.8	(±0.64)
common but four-wire provides	400	247.09	±0.95	(±0.33)	±2.3	(±0.79)
higher system accuracy.	500	280.98	±1.15	(±0.38)	±2.8	(±0.93)
	600	313.71	±1.35	(±0.43)	±3.3	(±1.06)
	650	329.64	±1.45	(±0.46)	±3.6	(±1.13)

Where t Is the actual temperature, In °C, of the platinum elements.

RTD Tolerance Class Definitions

DIN class A: ±[0.15 + 0.002 |t|]°C DIN class B: ±[0.30 + 0.005 |t|]°C

Thermistors

Thermistors are a cost effective choice when working with a narrow range of temperatures.

Resistance at 25°C (77°F) and ranges:

Epoxy Bead Tolerance ±1%Q (+0.3°C)

Glass Bead Tolerance ±15%n (+3°C)

-60 to 150°C (-76 to 302°F) -60 to 150°C (-76 to 302°F)

#11 #12

1000Q 3000Q

#16 100,000£2 -60 to 260°C (-76 to 500°F) *Other thermistors available on request.