pH Cooling Tower Controller Microprocessor-Based
Model 2175 from Lakewood Instruments

Lakewood Instruments Model 2175 Microprocessor Based Cooling Tower Controller

Discontinued Model

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.

* LONWORKS is a registered trademark of Echelon Corporation.


  • 4-electrode conductivity includes fouling compensation and alarm.

  • Integral flowsight & flowswitch lockout.

  • Records both makeup (MTR1) and blowdown (MTR2) water meter total gallons.

  • Configure blowdown water meter (MTR2) as second makeup meter.

  • Blowdown Relay options:

  • Bleed x gallons for every x gallons makeup

  • Bleed x minutes for every x gallons of makeup

  • Bleed by setpoint

  • Bleed by cycles of concentration with NCON/NCKT Option

  • Bleed by multi-setpoint selected with NCON/NCKT Option

    • Three user-selectable relay options (four additional with NRLY):
    • Feed by setpoint, direct or reverse;

    • Water meter actuated feed. MTR1, MTR2 or sum;

    • Feed after blowdown by percent of bleed time;

    • Feed by percentage of time;

    • Schedule feed timer (-RTC Option);

    • General alarm contact.

    • Three security levels:
    • View only

    • Operator

    • Technician

    • Four different languages.
    • English Spanish (standard)

    • English French (optional)

    • English German (optional)


    • Multiple control options in a single economical package.

    • Very accurate control of chemical feed and cycles of concentration.

    • Very low maintenance.

    • Tolerant to power surges and brownouts.

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

    • Indicates when to clean sensor.

    • Very accurate monitoring of the evaporated water.

    • Feeds chemical AFTER blowdown.

    • Has expansion slots to add additional control, such as chiller loop monitor and cycles of concentration based on incoming makeup water.


    Power 80-300 VAC 50/60 Hz
    Sensor 4 electrode Conductivity
    Temperature comp. Automatic
    Flow switch Dry contact
    Water Meter Input Two contacting head or open collector.
    Relays Four, 3 Amps @ 120 VAC
    4-20 mA Two, isolated w/-35L
    Pressure 140 psi (9.7 bar) @ 100ºF (38º C)
    Max. Temperature 140ºF (60º C)
    Min. Flow 1 gpm
    Conductivity Range 0-5,000 µS (other ranges optional)
    Conductivity Accuracy +/-40 µS
    Conductivity Resolution 10 µS
    Deadband Adjustable
    Setpoints Direct or Reverse (configurable in the field)
    Feed timer Adjustable
    Keypad Numeric
    Display Illuminated 128x64 pixel LCD
    Ambient Temperature 32-158ºF (0-70º C)
    Enclosure ABS Plastic
    NEMA 4X Optional

    Ordering Information

    2175 LONWORKS Technology-based conductivity and water meter actuated chemical feed controller. The 2175 has built-in options for feed on conductivity, blowdown or makeup. Totalizing or makeup, three security levels and blowdown are standard features. Conductivity range is 0-5,000 µS.
    CONTROLLER OPTIONS (optional, select no more than three)
    -RTC Adds 24-hour clock and calendar to controller (required to configure relays to feed chemicals/biocides based on time of day and for data acquisition if using the -RS2L Option). NOTE: Adding an -RTC card does not add relays.
    -35L Two 4-20 mA output configurable for remote data acquisition of conductivity.
    -RS2L Communications node with shareware software. Requires -RTC Option.
    -NIN Network interface node. Allows 1 NRLY and/or up to 3 NCON/NCKT to be added.
    ENCLOSURE OPTIONS (optional)
    -WP Weatherproof and watertight. inch knockouts. No outlets or power cords.
    LANGUAGE OPTIONS (optional, choose one, English and Spanish Standard)
    -EF English and French.
    -EG English and German.
    REMOTE NODE OPTIONS (optional, MUST purchase -NIN Option)
    NRLY Four additional relays with enclosure (1 per 2000 Series Controller).
    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, tee and enclosure. Maximum water pressure and temperature is 120ºF @ 100 psi (49ºC @ 6.9 bar).
    LRWS Windows-based registered software for computer to communicate with 2000 Series Controllers.
    MD4X High-Baud modem in NEMA 4X enclosure ready to power.
    MD High-Baud modem for use with 2000 Series Controllers.


    Model 2175e Cut Sheet

    Model 2175e Spec Sheet

    Model 2175e Manual

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