Barksdale ML1H-H351S Temperature Switch 100-225F

Product Description

The BARKSDALE ML1H-H351S is a local mount temperature switch designed for industrial and commercial process control applications. It monitors fluid or surface temperature and actuates a single-pole double-throw (SPDT) contact at a set point within a range of 100 to 225 degrees F. The switch uses a rigid stem sensor measuring 9/16 inch diameter by 2-25/32 inches in length, constructed from 304 stainless steel for corrosion resistance. Process connection is 1/2 inch NPT. Accuracy is rated at 1% of the mid-60% of full scale. Licensed instrumentation technicians, HVAC controls specialists, and industrial maintenance professionals typically install and commission this type of device.

This temperature switch is suited for residential, commercial, and light industrial applications where local set-point switching is required without a remote transmitter or controller. Typical installations include process piping, heating systems, and fluid handling equipment where a temperature threshold must trigger a control circuit. The local mount design keeps the switch directly at the sensing point, reducing wiring complexity. The SPDT contact form allows use in both normally open and normally closed circuit configurations, providing flexibility in control panel design.

Key Features

• Temperature range of 100 to 225 degrees F with single set point SPDT contact form
• Rigid stem construction, 304 stainless steel for durability in wet or corrosive environments
• 1/2 inch NPT process connection for direct pipe or fitting installation
• Local mount configuration eliminates need for remote sensing leads
• Accuracy rated at 1% of the mid-60% of full scale for reliable set-point control

Compatibility

Designed as an OEM-style replacement or new-installation temperature switch for process control, HVAC, and fluid handling systems requiring a 1/2 inch NPT rigid stem sensor with SPDT switching output in the 100 to 225 degrees F operating range.

Installation Notes

Installation should be performed by a qualified instrumentation technician or licensed controls specialist. Shut down and depressurize the process line and de-energize the control circuit before removing or installing the switch. Apply appropriate thread sealant to the 1/2 inch NPT fitting threads and verify torque per your facility or applicable code requirements. Confirm set-point adjustment and contact continuity with a multimeter before returning the system to service.