Configured for precise process monitoring and safety interlocks, the YOKOGAWA UT150L (UT150L Limit Controller) provides direct physical/electrical execution. This hardware component functions as a 1/16 DIN limit controller, utilizing universal input stages to monitor variables such as temperature, pressure, or flow, and triggering SPDT relay outputs upon threshold violations.

Hardware Specifications

Industrial Process Monitoring and Signal Conditioning

The UT150L features a versatile input architecture capable of processing various signals, including Type K, J, T, E, R, S, B, N, W, and PL2 thermocouples, as well as Pt100/JPt100 RTD sensors. For voltage and current loops, it accepts 0-1 V, 0-5 V, 1-5 V, or 0-10 V inputs directly, and 4-20 mA signals via external shunt resistors. The device integrates PID control with overshoot suppression and auto-tuning capabilities, ensuring that process stability is maintained even in dynamic industrial environments where variable fluctuation is frequent.

Frequently Asked Questions

Q: Does the UT150L provide galvanic isolation between the input signal and the relay output?

A: Yes, the controller maintains electrical isolation between the sensor input stage and the SPDT relay output to protect the internal processing circuitry from common-mode transients on the field side.

Q: Can the 4-20 mA current input be connected directly to the module input terminals?

A: No, the 4-20 mA signal must be converted to a voltage signal using a precision external shunt resistor prior to reaching the UT150L input terminals to ensure proper measurement scaling.

Field Installation Guidelines

• Verify that the panel cutout dimensions are exactly 45 mm x 45 mm (+0.6/-0 mm) to ensure the 1/16 DIN housing fits securely with the provided mounting brackets.
• Use shielded, twisted-pair cabling for all analog sensor inputs to prevent electromagnetic interference (EMI) from affecting the ±0.5% accuracy of the measurement.
• Ensure the relay output load does not exceed 3 A at 250 VAC; use an interposing contactor for higher-power inductive loads to prevent contact welding.
• Connect the sensor ground (if applicable) and instrument common to a single reliable earth point in the cabinet to minimize ground loops and signal noise.
• Confirm that the ambient operating temperature remains between -10 and 50 deg C, and provide adequate ventilation within the control panel to prevent overheating of the LED display driver and power supply stages.