United Electric Controls Differential Pressure Switch J120-452

Tools Needed: Screwdriver/Adjustable Wrench to 1-1/2"

Read and understand all instructions before device installation.

Check sensor model for compatibility with process media and wetted parts.

Disconnect supply circuits before opening to prevent ignition of hazardous atmospheres.

Ensure proof pressure limits are not exceeded, even by surges.

Wipe down cover and enclosure to prevent electrostatic discharge.

Install device where shock, vibration, and temperature fluctuations are minimal.

Mount device to prevent moisture entry and use explosion-proof sealing fittings.

Ensure the following safety precautions are observed before starting the wiring process

Remove cover and wire device as per Figure 3

Wire directly to the terminal block

Locate internal grounding terminal near the right-hand conduit opening

Replace cover and hand tighten to fully engage cover O-ring

Remove front window and gasket (four screws) to gain access to span adjustment

Connect device to calibrated gauge and set required differential pressure

Using a screwdriver, slowly turn the span adjustment to obtain required indication

Remount the front gasket and window

Ensure spanning adjustment does not affect mid-range indication

Verify adjustment is factory calibrated and sealed to indicate tampering

Determine Set Point and Deadband Values

Enter the desired rising set point (psi)

Calculate the falling set point by subtracting the deadband value from the desired set point

Set the falling set point using the standard adjustment screw

Turn the adjustment wheel clockwise to increase or counter clockwise to decrease the setting

Ensure you have the necessary tools

Connect device to a calibrated pressure source

Loosen phillips screw adjustment lock

Secure adjustment screw by tightening adjustment lock