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Model 350 pH Cooling Tower Controller
Product Information
The Model 350 allows you to control acid and/or caustic feed in order to maintain desired pH levels in your
cooling tower. This model features an alarm timer which prevents excessive chemical feed and a flowswitch
which prevents chemical feed if there is no sample flow. For cooling tower applications only. Includes plumbing.
Specifications
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Inputs
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Power
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120 VAC 120/240 VAC w/-WP
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Sensor
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pH Combination glass electrode in PVC housing
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Flow switch
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Dry contact
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Outputs
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Relays
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3 Amps @ 120 VAC
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0-1 mA
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non isolated
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4-20 mA
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isolated, internal power w/-35
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Plumbing
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Pressure
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140 psi (9.7 bar) 100°F (38°C)
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Max. Temperature
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140°F (60°C)
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Min. Flow
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1 gpm (3.8 Lpm)
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Controller
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pH Range
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5-10 pH
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Accuracy
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±0.05 pH
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Resolution
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0.01 pH
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Deadband
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Adjustable
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Setpoints
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HIGH and LOW
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Alarm Timer 5-90 minutes.
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Locks out both HIGH and LOW setpoints.
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Ambient Temperature
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32-158°F (0-70°C)
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Electrical Rating
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UL Listed
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Enclosure
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ABS Plastic
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NEMA 4X Optional
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Ordering Information
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350
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pH controller for acid and caustic feed that has dual setpoints, 5-10 pH scale, a feed limit
timer with push button reset, flowswitch, sensor, power cord, outlets and a digital display. UL Listed.
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CONTROLLER OPTIONS (optional)
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-CRPH
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Custom setpoint dial; 0-14 pH
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REMOTE SENSOR OPTIONS (optional)
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-RPFS
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Unlimited distance. Preamp, sensor, flowswitch and sensor tee. Cable must be provided by customer
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ENCLOSURE OPTIONS (optional)
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-WP
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Watertight enclosure with 120/240VAC 50/60 Hz power switch. ½ inch conduit knockouts. No outlets or power cord.
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PLUG-IN OUTPUT OPTIONS (optional, select one only)
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-35
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Isolated 4-20 mA output for remote data acquisition.
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-39F
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Frequency output contact for electronically pulsed chemical pump.
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-39P
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Percent on-time modulating contact for solenoid chemical feed systems.
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-42
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HIGH/LOW alarm contacts with adjustable setpoints.
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-44
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Isolated 4-20 mA output plus High and Low alarms.
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