Model 352

SKU: 352

Pump Controller, Two Relay, 4-20mA

The Delta Controls Model 352 is designed to be operated as an alarm unit and/or adjustable differential level controller and is equipped with two relays. Each relay has an individual 0% to 100% On and 0% to 100% Off setpoint. It accepts a 4-20 mA dc input signal which is proportional to some process variable–usually level. The 352 is microprocessor based and checks its input signal loop for integrity. The relays may be set up for Direct or Reverse fail-safe action.

The 352 is equipped with a built-in loop power supply and it can accept a remotely powered 4 mA dc to 20 mA dc signal. The 352 must be located in a ‘safe’ area. The input signal wires may extend into the ignition hazard area. The 352 may be operated in the pump controller mode. Features, such as lead/lag pump rotation, time delay starting, and alarms may be programmed in the field. Up to two pumps can be controlled and/or two alarm points can be actuated from a single module.


  • Microprocessor based
  • Available for mounting in Delta Controls housings or in in enclosures by others
  • Housings may be surface or pipe stand mounted
  • Optional direct reading LCD display
  • Accepts 4-20 mA dc signal from any type transmitter; 2, 3 or 4-wire
  • Supplies DC power for 2-wire loops, and for 3 or 4-wire transmitters
  • Field selectable fail-safe action
  • Optional pump control functions
  • Lead/lag control
  • Relay operate time delays
  • Two alarm points
  • Built-in loop power supply
  • Selectable starting time delay
  • Self-checking diagnostic routine
  • Will not lose memory
  • Continuous setpoint indication
  • Optional explosion-proof housing


  • General Type: Microprocessor based
  • Supply Power:120 ACV or 240 ACV 50 Hz or 60 Hz or 24 DCV ± 15% variation
  • Input Range: 4-20 mA dc
  • Relays:2, 10 A @ 250 ACV SPDT
  • Switching Action: > Alarm action is basic Adjustable differential for On/Off control may be selected
  • Accuracy: 0.1% of full scale
  • Transmitter Loop Power Supply: 24 DCV
  • Multiple Pump Control: Selectable lead/lag Rotation of up to 2 pumps
  • Readout Display (Optional): 3.5 digit LCD May be field calibrated to be direct reading in engineering units
  • Temperature Range: -20 °F to +170 °F (-20 °C to +77 °C)
  • Signal Loop (Optional Barrier): Classes 1 & 2, Divisions 1 & 2, Groups ABCD, EFG

Required Ordering Information

  • Detailed model number
  • Tag or nameplate detail (if required)
  • Documentation/testing tiers (if required, refer to Additional Resources in the product catalog)

Additional Information


Pump Controller, Two Relay, 4-20mA

Level Measurement

Point, Pump Controllers

Accessories and Related Products