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Model 2412e pH and Conductivity Controller




pH & Conductivity COOLING TOWER Controller


LonWorks® Technology is the latest in microprocessor capability that gives the user the highest level of application flexibility.  A large graphic screen, multiple inputs and very easy setup with easy field upgrade characterize this new technology


Power cord, plug outlets and detached plumbing make installation easy.  There is plenty of protected room inside the enclosure for electrician wiring.


 2412e MANUAL



  • Two water meter inputs, pH and conductivity inputs with sensors with 15 ft cable, flow switch input, four relay outputs, and Power On/Off switch are all standard features.
  • Removable power cord and receptacles for simple conduit installations.
  • Includes four relays for bleed, chemical feed, and alarms; expandable up to 12 relay outputs.
  • Includes three security levels to prevent unauthorized programming access.
  • Includes two languages; English/Spanish are standard.
  • Heavy-duty stainless steel domed numeric keypad and large 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 with the Lakewood plain English, intuitive, and user friendly menu interface.
  • Expandable in the field with the use of the Nodes for additional inputs, such as chiller loop monitor and cycles of concentration based on incoming makeup water, or additional outputs such as 4-20 mA and remote communications.
  • Able to feed chemicals by multiple feed schemes including biocide addition, setpoint control, percent of blowdown, percent of time, and by water meter.




Power 120/240 VAC  50/60 Hz Conductivity Range 0-5000 µS (other ranges optional)
Sensor pH Combination Conductivity Accuracy ± 40 µS
  Glass Electrode Conductivity Resolution 10 µS
Temperature comp. None Deadband Adjustable
Flow switch Dry contact Setpoints Direct or Reverse (config in the field)
Water Meter Inputs Contacting head, Paddle Feed timer Adjustable
  Wheel, or Turbine. Keypad 16 tactile push-buttons
Outputs   Display Illuminated 128×64 pixel LCD
Relays Four, 3 Amps @ 120 VAC Ambient Temperature 32-158°F (0-70°C)
4-20 mA Two isolated or non- Enclosure NEMA 4X, ETL
  isolated w/-35L option  
Controller   Sensors/Plumbing Cooling Tower
pH Range 2 to 12 pH Max Pressure 140 psi  (9.65 bar)@ 100 °F
pH Accuracy ± 0.05 pH Max Temp 140°F (60°C)
pH Resolution 0.01 pH Min flow 1 gpm (3.785 Lpm)

LonWorks is a registered trademark of Echelon Corporation



2412e    LonWorks® Technology-based pH and conductivity controller with plumbing and  flow switch.  Four relays are integral to the system.  One is dedicated to blowdown.  The others may be configured for pH (acid or caustic), inhibitor feed on conductivity, water meter, percent of time or schedule feed.  pH range is 0-14 and conductivity range is 0-5,000 µS.

CONTROLLER OPTIONS (optional, select one or more)

-PS        +24 volt power supply required for 3 or more nodes.
-RS2L       Communications node with LRWS program.
-35L         Two 4-20 mA outputs configurable for data acquisition of conductivity and pH.
-NIN         Network interface node.  Allows 2 NRLY, 1 Makeup NCON, 4 sensor nodes (NpH or NCON), 2 N420I  and or 2 NDIG to be added.
2KIN-V1  Card to connect controller to LON based systems or gateways.

LANGUAGE OPTIONS (optional, choose one, English and Spanish Standard)

-EF          English and French.

-EG         English and German.


REMOTE NODE OPTIONS (optional, MUST have -NIN option)

NRLY      Four additional relays with enclosure (2 per 2000 Series Controller), also available with receptacles and power cord
NpH         pH/ORP node for a pH or ORP sensor.
N420I      4-20 ma input node for up to four 4-20 ma inputs.
NDIG      Digital input node for up to four digital inputs.
NCON      Conductivity node for makeup water or closed loop control (node only).
NCKT     Conductivity node for makeup water or closed loop control with PVC sensor, te and enclosure.  Maximum water pressure and temperature is 140 psi @ 100°F  9.7 bar @ 38°C).



MP         Mounting Plate (12 X 21 in.).

LRWS      Windows-based software program for computer to communicate with 2000 Series.
WEBNode IP/TCP device for use with 2000 Series controllers.
EZWeb     Wireless internet interface for use with WEBNode and 2000 Series controllers.





1166418            O-Ring, for sensor and/or flow sight, set of 10

1169740            Red Ring replacement Kit set of two

1107004            Reed Switch w/20 ft of cable

1167266            Flow Sight set of five

1167234            Flow Float set of five

1169202            Sensor, Conductivity 4 elec w/ 20 ft of cable

1240472            Sensor, pH 1520e, 2350e, 2412e, 2812e, 2832e w/ 15 ft of cable

1268640            Plumbing, 1512e/2412e/2430e/2812e/2830e

1107251            PS (+24VDC supply required for 3 or more nodes)