The Allen-Bradley 836T-D462JX81X9 Electromechanical Differential Pressure Controller from the 836 series reads 2 different pressure signals coming from different parts of an application process or machine, and it compares these signals to one another in order to obtain a pressure differential that will then be used to activate or deactivate 2 sets of electrical contacts to perform a control action on the measured variable. A perfect example of this is when the controller is used to measure the level of a liquid column inside a storage tank. In that application, one of the pressure signals incoming to the Allen-Bradley 836T-D462JX81X9 Electromechanical Differential Pressure Controller is connected to the lower part of the tank, while the other is connected to the upper part. The differential pressure between those signals is a precise indirect measurement of the distance between those 2 signals, which is, the level of liquid in the tank.

The Allen-Bradley 836 series 836T-D462JX81X9 Electromechanical Differential Pressure Controller is versatile and rugged enough to be installed outdoors right beside the controlled device, or indoors in a protected enclosure. Both vertical and horizontal mounting orientations are allowed. The Allen-Bradley 836T-D462JX81X9 Electromechanical Differential Pressure Controller comes from the factory with a Type 1, 4, and 13 rated industrial enclosure that is made from a heavy-duty metal alloy material that is designed to last for a long time. The operating temperature range for this controller should remain within the range of 0 to 60 degrees Celsius (32 to 140 degrees Fahrenheit), and protective measures like heaters or fans should be installed in environments with frequent high or low temperature ratings. The relative humidity levels should be kept between 5 and 95% (non-condensing).