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WLS-TEMP Specifications

Accuracy

Thermocouple measurement accuracy

Table 4. Thermocouple accuracy specifications, including CJC measurement error

Sensor Type

Maximum error (°C)

Typical error (°C)

Temperature range (°C)

±1.499

±0.507

–210 to 0

±0.643

±0.312

0 to 1200

±1.761

±0.538

–210 to 0

±0.691

±0.345

0 to 1372

±2.491

±0.648

–50 to 250

±1.841

±0.399

250 to 1768.1

±2.653

±0.650

–50 to 250

±1.070

±0.358

250 to 1768.1

±1.779

±0.581

250 to 700

±0.912

±0.369

700 to 1820

±1.471

±0.462

–200 to 0

±0.639

±0.245

0 to 1000

±1.717

±0.514

–200 to 0

±0.713

±0.256

0 to 600

±1.969

±0.502

–200 to 0

±0.769

±0.272

0 to 1300

Note 4: Thermocouple measurement accuracy specifications include linearization, cold-junction compensation

and system noise. These specs are for one year, or 3000 operating hours, whichever comes first, and

for operation of the device between 15 °C and 35 °C. For measurements outside this range, add ±0.5

degree to the maximum error shown. There are CJC sensors on each side of the module. The accuracy

listed above assumes the screw terminals are at the same temperature as the CJC sensor. Errors shown

do not include inherent thermocouple error. Please contact your thermocouple supplier for details on

the actual thermocouple error.

Note 5: Thermocouples must be connected to the device such that they are floating with respect to GND (pins

9, 19, 28, 38). The device GND pins are isolated from earth ground, so connecting thermocouple

sensors to voltages referenced to earth ground is permissible as long as the isolation between the GND

pins and earth ground is maintained.

Note 6: When thermocouples are attached to conductive surfaces, the voltage differential between multiple

thermocouples must remain within ±1.4 V. For best results we recommend the use of insulated or

ungrounded thermocouples when possible.

Semiconductor sensor measurement accuracy

Table 5. Semiconductor sensor accuracy specifications

Sensor Type

Temperature Range (°C)

Maximum Accuracy Error

LM35, TMP35 or

equivalent

–40 to 150

±0.50

Note 7: Error shown does not include errors of the sensor itself. These specs are for one year while operation

of the device is between 15 °C and 35 °C. Please contact your sensor supplier for details on the actual

sensor error limitations.

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