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1520E Microprocessor Based Cooling Tower pH Controller


Brand: Lakewood Instruments
Product Code: 1520E-1240476

1000 in stock


The Model 1520/30e uses the latest in microprocessor capability, giving the user a high level of application flexibility in pH or ORP control. The user in the field can configure this controller to operate as a pH or an ORP controller. A large illuminated graphics screen, multiple inputs and very easy setup characterize this new technology. Water meters, sensors and plumbing assemblies are purchased separately.


  • Removable power cord and receptacles for simple conduit installations.
  • Scheduled feed, which can use three relays for biocides or other chemicals.
  • 2 water meter inputs, 2 drum switch inputs, pH or ORP input, flow switch input and 4-20 mA output are all standard features.
  • A 4-20 mA input for remote pH or ORP applications can be used in place of the standard pH or ORP input.
  • Designed with a single circuit board for better reliability and lower cost.
  • Large open shallow enclosure for easy wiring.
  • Heavy-duty stainless steel domed numeric keypad and illuminated graphical display allow for quick and easy programming. Steel domed switches improve the tactile sensing and life expectancy of the keypad.
  • LED indicators for power, alarm and relay status.


  • Easy to program with the Lakewood plain English, intuitive and user-friendly menu interface.
  • Controller can be removed from a cooling tower and be placed in another type of application when used with the appropriate pH or ORP sensor.
  • Single circuit board design improves reliability.
  • No add-on options. 4-20 mA output and biocide features are standard.


  • Type: Model 1520e
  • Includes: pH sensor
  • Output Relays: 4 selectable use relays
  • Flow Switch: Left exit flow switch plumbing assembly
  • Water Meter: 2 water meter (contact head, paddle wheel or turbine) inputs
  • Analog Input: pH or ORP or 4-20 mA input
  • Output Signal: 1 isolated or non-isolated optionally powered 4-20 mA output
  • Drum Switch: 2 digital contact drum switch inputs
  • Minimum Flow: 1 GPM (3.785 LPM)
  • Maximum Pressure: 140 psi (9.65 bar) @ 100 °F
  • Process Temperature: Max 140°F (60°C)
  • Ambient Temperature: 32° – 120° F (0° – 49° C)
  • Sensor Type: Solution ground, signal differential, or single-ended
  • pH Range: 2-12 pH
  • pH Resolution: ± 0.10 pH
  • ORP Range: -1000 to +1000 mV
  • ORP Resolution: ± 1 mV
  • Accuracy & Repeatability: ± 1.0%
  • Deadband/Setpoint: Adjustable
  • Enclosure: NEMA 4X, ETL
  • Timer: Relay run time exceeded
  • Power: 120/240 VAC 50/60 Hz
  • Relay Ratings: 3A each, 10A total
  • Usage: Water treatment pH control
  • Weight: 7 lbs

Additional information