Technical Description

The UT150L is a compact, high-reliability digital limit controller designed for industrial safety and process protection. It monitors critical process variables—such as temperature, pressure, or flow—and acts as a hardware-level safety interlock. When a process variable exceeds a user-defined high or low limit, the controller triggers a mechanical relay output, shutting down equipment to prevent hazardous conditions. Its intuitive front panel and simplified parameter setup enable rapid commissioning in panel-mounted applications, ensuring consistent operational safety for furnaces, ovens, and critical processing machinery.

Technical Specifications

Industrial Applications

The UT150L is commonly used in:

• Heat treatment furnaces

• Laboratory drying ovens

• HVAC systems and critical thermal processes

It functions as an independent safety watchdog, providing redundancy outside the main control loop to meet safety regulations and prevent catastrophic equipment failure.

Frequently Asked Questions

What differentiates the UT150L from a standard PID controller?
The UT150L is a limit controller, not a continuous PID device. It remains dormant during normal operation and activates only when a preset threshold is crossed, providing a hard-wired safety shutdown.

Can the UT150L be reset automatically?
Yes, it has a configurable reset mode. However, manual reset is recommended in safety-critical applications to ensure the cause of the limit breach is investigated before resuming operation.

Is the input range field-configurable?
Yes. The controller supports a wide variety of thermocouple, RTD, and DC input types, all configurable via the front keypad without additional hardware modules.