Lakewood Instruments

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.

Features

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)

Benefits

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.

Specifications

Inputs
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.

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

Controller
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

REMOTE NODE OPTIONS (optional, MUST purchase -NIN Option)
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.
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). NOTE: NOT FOR USE WITH MULTIPLE COOLING TOWERS.
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.