Specifications

30
Series CW
Conductivity Control with Water Meter Feed
The Series CW was designed to control conductivity and feed
inhibitor in an open-air cooling tower. Chemical feed is initiated
and controlled by input from a water meter. The Series CW com-
bines everything you need to control conductivity and feed inhibi-
tor into one unique, compact package to create a simple and
cost effective metering and control system.
Principal of Operation
The Series CW includes a solenoid actuated metering pump,
conductivity sensor, bleed relay and a dry contact input for water
meter control. At set-up, the operator sets the conductivity set
point, differential (or dead-band), the pump stroke frequency and
run time. When conductivity reaches the set point, the system
activates the bleed relay.
As make-up water passes through the water meter, it generates
a series of pulses based on the volume of flow. The pump
counts the pulses until the total reaches the Count set point. The
pump runs at the frequency and run-time specified at set-up and
the count is reset.
Features
 120VAC or 250VAC @ 50/60 HZ, 5A max
 4-electrode conductivity input
 0-6000 mS/cm + 1%, temperature compensated
 Relay rated to 5A at 240VAC
 Isolated dry contact flow switch input
 Isolated dry contact water meter input
Pressure and Flow Rate Capacity
LW02 LW03 LW04 LW64
Capacity GPH 0.25 0.50 1.00 1.25
nominal GPD 6 12 24 30
(max.) LPH 0.9 1.9 3.8 4.7
Pressure PSIG 150 150 100 100
(max.) BAR 10 10 7 7
MODEL
Electronic Metering Pumps with
Integrated Controller
CM
CM
CM
CM
Engineering Data
Reproducibility:
+/- 2% at maximum capacity
Controls:
9 key membrane keypad, Single button function keys
Conductivity Sensor:
4 electrode
Conductivity Range:
0-6000 µS/cm +/- 1%, Temperature Compensated
Input:
Isolated Dry Contact Flow Switch
Isolated Dry Contact Water Meter
Functions:
Set, Differential, Calibration, and Pulse Timer and
Count Function
Status Display:
4 Digit LED
Stroke Frequency Turn-Down Ratio:
100:1
Stroke Length Turn-Down Ratio:
100:1
Relay Ratings:
5A at 240 VAC
Power Input:
115 VAC/50-60 HZ/1 ph
230 VAC/50-60 HZ/1 ph
5 Amp max
 4 Digit LED, 9 key membrane keypad
 Single-button function keys
 Set, Differential, Calibration, Pulse Timer, and Count functions
 Stroke rate adjusts 0-100% in 1% increments, turndown ratio 100:1
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