Built with a rugged carbon steel housing

By mounting conductive probes in an external chamber

The McDonnell & Miller 328100 is an authentic OEM replacement casting specifically engineered for the 157-R Series low water cut-off and pump controllers

Its 36-inch length allows for flexible installation in tight mechanical closets where rigid piping is impractical

or 35 psig steam applications

Siemens Building Technology QAA2235.EWSN Sensor mario Built with a rugged carbonThe Siemens QAA2235. EWSN is a precision room temperature sensor engineered for seamless integration into commercial Building Automation Systems (BAS). Utilizing a 100k Ohm thermistor active output, this unit provides highly stable and linear temperature feedback to HVAC controllers, ensuring tight deadband management and optimized energy efficiency. Designed specifically for indoor comfort monitoring, it operates across a standard range of 32F to