System Sensor D4S Detector Sensor 30067439-890 use a digital manometer while

use a digital manometer while adjusting the screw (clockwise to increase

and original Robertshaw 21432 series

the ED510 display module must be purchased separately

tool-free adjustment of the water level

Always verify the part number on the existing valve body before installation

System Sensor D4S Detector Sensor 30067439-890 use a digital manometer whileThe System Sensor D4S is a 4 wire photoelectric duct smoke detector sensor component designed specifically for integration with the D4120 duct smoke detector housing. Engineered for high performance HVAC smoke detection, this replacement sensor head utilizes an advanced optical sensing chamber to detect combustion particles across a wide range of airflow speeds. It is optimized for low flow duct smoke detection, maintaining reliable operation in