This 1/2 watt (often specified as 1/4W to 1/2W depending on the application) 4-20mA adaptor allows for precise proportional control without the need for complex external transducers

this unit is built for durability in mechanical rooms and air handling units

designed to eliminate parallax errors during manual readouts

Built to exacting Armstrong Air specifications

functioning as a normally open contact that closes once the draft inducer motor generates sufficient negative pressure

Functional Devices RIB RIB2421SB Relay This 1/2 watt (often specifiedThe Functional Devices RIB2421SB is a heavy duty, pre packaged 20 Amp enclosed relay engineered for high demand HVACR and industrial energy management systems. This SPDT relay features a multi voltage coil that accepts 24VAC DC, 120VAC, and 208 277VAC, providing a versatile solution for varying control circuit requirements without the need for multiple stocked parts. Designed for direct BAS and lighting control, the RIB2421SB relay includes an