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UT550-31

The Yokogawa UT550-31 is a high-precision, rugged, and intuitive handheld process calibrator designed for field technicians and instrument engineers. It combines the functionality of a signal calibrator, a measurement tool, and a loop power supply into a single, robust device. It is primarily used for the calibration, testing, and troubleshooting of temperature sensors (like RTDs and thermocouples) and other process instruments.

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Specifications
General Specifications
Model: UT550-31 (Measure/Simulate for TC, RTD, DC V, DC mA, Resistance)

Display: Large dot-matrix LCD with backlight

Operating Temperature: -10 °C to +50 °C (+14 °F to +122 °F)

Storage Temperature: -20 °C to +60 °C (-4 °F to +140 °F)

Relative Humidity: 5% to 95% RH (non-condensing)

Ingress Protection (IP Rating): IP54 (Protected against limited dust ingress and water splashes from any direction)

Safety Rating: IEC 61010-1, CAT II 300V

Power Supply: 2 x AA alkaline batteries or Ni-MH rechargeable batteries

Battery Life: Approx. 20 hours (with alkaline batteries, backlight off)

Dimensions (H x W x D): 189 mm x 92 mm x 45 mm (7.44" x 3.62" x 1.77")

Weight: Approx. 400 g (0.88 lbs) including batteries

Measurement (M) Functions & Accuracy
The calibrator can read/measure the following signals with high accuracy:

Thermocouple (TC): Types K, J, T, E, R, S, B, N, L, U, W5Re/W26Re, PLII

Accuracy: ±0.3 °C for K type (typical, at 23°C ±5°C)

Resistance Temperature Detector (RTD): Pt100 (JIS, IEC, JISC1604-1981, ASTM), JPt100

Accuracy (4-wire): ±0.05 °C for Pt100 (typical, at 0°C, 23°C ±5°C)

DC Voltage: Ranges of ±60.000 mV, ±600.00 mV, ±6.0000 V, ±30.000 V

Accuracy: ±0.02% of reading ±3 digits (for the 6V range)

DC Current: 0 to ±32.000 mA

Accuracy: ±0.02% of reading ±3 digits

Resistance: 0 to 1200.0 Ω (for 2-wire), 0 to 3200.0 Ω (for 3/4-wire)

Accuracy (4-wire): ±0.02% of reading ±3 digits