pH,ORP,Water,Treatment,Controller,Model 1520/30e,Lakewood Instruments

pH and ORP Water Treatment Controller Model 1520/30e from Lakewood Instruments


Product Information - pH and ORP Water Treatment Controller Model 1520/30e

pH,ORP,Water,Treatment,Controller,Model 1520/30e,Lakewood Instruments 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.


  • Use this Controller for Cooling towers, Process, Wastewater, and Condensate systems.
  • Removable power cord and receptacles for simple conduit installations.
  • Scheduled feed, which can use three relays for biocides or other chemicals.
  • Two (2) water meter inputs, two (2) drum switch inputs, pH or ORP input, flow switch input, and 4-20 mA output are all standard features.
  • 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.


  • Easy to program, the Model 1520/30e Controller menu is just like the Lakewood 1575e controller.
  • 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.


  • pH range 0-14 pH
  • ORP range -2000 to +2000 mV
  • Sensor Types Solution ground, Signal differential, or Single- ended
  • Resolution ± .10 pH or 1 mV
  • Temperature comp. Automatic
  • Accuracy & repeatability ± 1.0%
  • Deadband/Setpoint Adjustable
  • Auto/Manual outputs Menu selectable
  • Keypad 16 tactile push-buttons
  • Display illuminated 128x64 pixel LCD
  • Drum Switch Inputs 2 digital contact inputs
  • Water meter inputs (2) Contact head, paddle wheel or turbine
  • Timer Relay run time exceeded
  • Output Signal One 4 – 20 mA, non-isolated powered output
  • Output relays 4 selectable use
  • Relay ratings 3A each, 10A total
  • Power 120/240 VAC 50/60 Hz
  • Ambient 32° - 120°F (0 - 49°C)
  • Enclosure NEMA 4X


Cooling Tower
Max Pressure
(at 100°F)
140 psi (9.65 bar) @100°F 600 psi (41.3 bar) 70 psi (4.8 bar)
Max Temp 140°F (60°C) Up to 230°F (110°C)
230°F (110°C)
Min flow 1 gpm (3.785 Lpm) 1 gpm (3.785)
1 gpm (3.785 Lpm)

Controller Options

1240475   Water Treatment Controller only. Universal controller is field programmable for cooling towers, wastewater, and condensate applications. (No sensor or Plumbing.)

1240476   Water Treatment Controller, including Cooling Tower Flow Switch Plumbing and pH Sensor.

1240518   Water Treatment controller with Cooling Tower Flow Switch Plumbing and pH Sensor on a PVC mounting plate.

1240519   Water Treatment controller with Cooling Tower Flow Switch Plumbing and ORP Sensor on a PVC mounting plate.

Cooling Tower Options

Cooling Tower Flow Switch Plumbing
pH Sensor

1240472   Cooling Tower pH sensor with 15 ft of cable.

1240473   Cooling Tower ORP sensor with 15 ft of cable.

1240477   Cooling Tower Flow Switch Plumbing Assembly.

Process / Wastewater Options

520 Series
530 Series

Use the Lakewood Instruments 520 series sensors for pH.
Use the Lakewood Instruments 530 series sensors for ORP.

Condensate Options


1165305 520-4-7I-10-STD Condensate pH sensor with ¾ in NPT inline fitting.
1167983 520-4-7R-18-STD Condensate pH sensor with 1.0 in NPT retractable inline fitting.