Wika 31040A008A4SF Bimetal Dial Thermometer 50-300F

Product Description

The WIKA 31040A008A4SF is a bimetal dial thermometer designed for direct immersion temperature measurement in HVAC, plumbing, and industrial process applications. It reads across a range of 50 to 300 degrees F (10 to 150 degrees C) and features a 4-inch stainless steel stem with a bottom-connected mount. The housing and stem are constructed from 18-8 grade stainless steel, making it suitable for installation in environments where corrosion resistance and durability are required. Accuracy is rated at 1.0 percent of full scale. Licensed tradespeople and service technicians install this thermometer where a reliable, mechanical temperature indication is needed without requiring external power.

This thermometer is well suited for residential and light commercial HVAC systems, hydronic heating and cooling loops, domestic hot water systems, and general process piping. The bottom-connected mount allows direct insertion into a pipe or fitting from the base of the instrument, keeping the dial face forward-facing and readable after installation. It is commonly used on boiler supply and return lines, chiller circuits, heat exchangers, and similar applications where a fixed, analog temperature gauge is preferred over electronic sensors.

Key Features

• Temperature range of 50 to 300 degrees F (10 to 150 degrees C) covers most hydronic and HVAC service conditions
• 1.0 percent full-scale accuracy suitable for field service and system commissioning
• 4-inch stem length provides adequate immersion depth in standard pipe configurations
• Bottom-connected mount keeps the dial upright and readable inline with piping runs
• 18-8 grade stainless steel construction on housing and stem resists corrosion in wet or humid environments
• Mechanical bimetal design requires no external power source or wiring

Compatibility

Designed as an OEM-style direct-immersion thermometer for use in residential and commercial HVAC, hydronic, and plumbing piping systems where a bottom-connected dial thermometer with a 4-inch stem is specified.

Installation Notes

Installation is typically performed by a licensed HVAC technician or plumber. Shut off the system and relieve line pressure before installing or removing the thermometer from any pressurized pipe or fitting. A thermowell is recommended for installations where the thermometer may need to be serviced without draining the system. Verify that the connection fitting and thread type match the thermometer inlet before installation.