pH & Conductivity Cooling Tower Controller
Lakewood Instruments Model 2412

pH & Conductivity Microprocessor-Based Cooling Tower Controller Lakewood Instruments Model 2412

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.

• 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.

• 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.

• 4-electrode conductivity includes fouling compensation and alarm.

• Differential pH sensor with diagnostics indicate fouled reference or broken glass.

• 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/NCKTOption

  • 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)

•  

Inputs
Power	80-300 VAC
Sensor	4 electrode Conductivity pH glass electrode and reference electrode
Temperature comp.	Automatic
Flow switch	Dry contact
Water Meter Input	Two contacting head or open collector
Outputs
Relays	Four, 3 Amps @ 120 VAC
4-20 mA	Two, isolated w/-35L
Sensor/Plumbing
Pressure	140 psi (9.7 bar) @ 100ºF (38º C)
Max. Temperature	140ºF (60º C)
Min. Flow	1 gpm (3.8 Lpm)
Controller
Conductivity Range	0-5,000 m S (other ranges optional)
Conductivity Accuracy	+/-40 µS
Conductivity Resolution	10 µS
pH Range	0-14 pH
pH Accuracy	+/-0.05 pH
pH Resolution	0.01 pH
Deadband	Adjustable
Setpoints	Direct or Reverse (configurable in the field)
Feed timer	Adjustable
Keypad	Numeric
Display Illumin.	128x64 pixel LCD
Ambient Temperature	32-158º F (0-70º C)
Enclosure Rating	ABS Plastic
	NEMA 4X Optional

2412		LONWORKS Technology-based pH and conductivity controller with plumbing and flow switches. 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 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 outputs configurable for remote data acquisition of conductivity and pH.
-RS2L		Communications node with shareware software. Requires -RTC Option.
-NIN		Network interface node. Allows 1 NRLY and/or up to 3 NCON/NCKT’s to be added.
ENCLOSURE OPTIONS (optional)
-WP		Weatherproof and watertight. ½ 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 above)
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 100ºF (38ºC) @ 140 psi (9.7 bar).
SOFTWARE AND EXTERNAL MODEMS
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.