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Chemtrol 255 PPM/PH Digital Chemical Controller

The CHEMTROL 255 PPM/pH Controller automatically maintains both Free Chlorine concentration and pH of the water.
All operating functions are clearly labelled and accessible from the front panel,with safety and easy-reset features not found on other controllers.

The CHEMTROL 255ppm/Ph Controller introduces a long awaited technological breakthrough in automated water treatment with a proprietary new sensor for Free Chlorine.

The Chemtrol Controller is based on 25+ years of experience in pool automation. With over 25,000 installations worldwide and featuring a 5-year electronics warranty.

A simple and inexpensive controller for:

Residential Pools and Spas

Commercial Pools and Spas

Hotels, Motels

Health Clubs

Apartments Buildings

Condo Associations.

Industrial Water Treatment.

A microprocessor-based digital controller, it is designed to maintain both chlorine PPM and water pH in high-end residential pools, commercial pools and spas and industrial applications.

True PPM Readings

The new PPM Sensor is a solid state sensor with a selective membrane that provides direct readings of Free Chlorine in water at concentrations ranging from 0.1 to 10 ppm (parts per million) or mg/l (milligrams per litre).

These are true readings of Free Chlorine and not approximate values derived from ORP readings.

A significant advantage of this sensor is that its not affected by the use of any type of Cyanuric Acid (CYA) stabilizer and/or oxidizers, thereby assuring constant Free Chlorine levels at all times. Extensive laboratory and field tests have shown it to be very accurate and reliable.

PRECISE AND RELIABLE CONTROL

As shown on the graphic data log on the right, the new sensor gives the operator precise and reliable control of Free Chlorine under the most difficult conditions.

The CHEMTROL 255 is the only easy-to-use controller offering True Free Chlorine and pH control for pools, spas, cooling towers, industrial water treatment, etc.

SANITIZER AND pH CONTROL MADE EASY

Designed for affordability, simplicity of installation, ease of use and long-term reliability, it includes features normally not found on this type of controller, such as:

adjustable setpoints,

adjustable high and low alarms,

adjustable overfeed safety timers and

adjustable proportional feed control.

Features and Advantages

Easy to install

5 year electronic warranty

No expensive reagents required

No pressure cell required

Not affected by Cyanurates

Not affected by Oxidizers

Adjustable set points

Adjustable alarms

Remote operation via PC

Weather proof cabinet

EASY TO INSTALL

Unlike conventional amperometric or colorimetric sensors, the PPM sensor is easy to install and operate. It does not require a special pressure flow cell and/or expensive and expendable chemical reagents. And best of all, its maintenance free.

Installation of the CHEMTROL 255 is as easy as 1-2-3.

CONTROLLER - Connect the controller to the 110 or 230V output of the Timer in parallel to the recirculation pump. This will prevent accidental feeding of chemicals when the pump is not running.Make sure to follow the electrical code.
SENSORS - Install the PPM and pH sensors on the recirculation line or on the optional bypass line. The two sensors can be mounted directly on the main recirculation line with 2" PVC tees, as shown on the schematic. For recirculation lines over 2" in diameter lines, the sensors should be mounted on a 1/2" bypass line.
CHEMICAL FEEDERS - Connect the chemical feeders to the 110 or 230V controller outputs, according to the manufacturers instructions, making sure to inject the chemicals downstream of the sensors. For a bromine or chlorine erosion feeder, install a corrosion-resistant solenoid valve on the intake line of the feeder. The controller is compatible with most ozonators and electrolytic generators.

Flow Cell Assembly

For best operation, it is recommended to install the sensors on a bypass line with a Flow Cell Assembly (FCA) as shown below.

The FCA includes a see-through cell with a plastic cover that regulates the flow of water and allows the operator to see the tip of the sensors.

The cell includes the following:

two 1/2" FPT fittings for the connections to the bypass line,
two 1/2" FPT fittings for mounting the sensors,
a spigot for water testing,
a bleed line to prevent air lock in the cell,

In addition it is also recommended to install a safety switch on the bypass line to prevent accidental feeding of chemicals.
The CHEMTROL 255 PPM/pH Digital Controller automatically maintains both sanitizer PPM and water pH in pools and spas.

All operating functions are clearly labeled and accessible from the front panel, with many safety and easy-reset features not found on other controllers:

pH calibration from 7 to 8,

PPM setpoint from 0.1 to 10.0 ppm or mg/l (or 0.01 to 2.0 optional),

pH setpoint from 7 to 8,

Chlorine and pH feed modes: off, manual, automatic,

PPM and pH proportional control bandwidth from 0 to 100% of the setpoint,

Chlorine high and low alarms from 400 to 900 mV,

pH high and low alarms from 4 to 10,

Chlorine overfeed safety timer from 0 to 999 minutes,

pH overfeed safety timer from 0 to 99 minutes.

To select a function, simply press PPM or pH and then the desired function. The display shows the current function value. Use the UP or DOWN arrows to adjust to the desired value.

CONTROL SETPOINTS

The standard factory-set Chlorine control level is 1.0 ppm or mg/l, based on WORLD HEALTH ORGANIZATION (WHO) and NATIONAL SPA AND POOL INSTITUTE (NSPI) values for prevention of germs and bacteria. A range of 0.01 to 2.0 is also available for low chlorine level applications.

The standard factory-set pH control level is 7.5. Below 7.4, the water causes eye irritation and corrosion of equipment. Above 7.6, it also causes eye irritation plus water cloudiness, scaling, stains and reduced sanitizer efficiency.

To change the control levels, the operator presses PPM or pH and then SETPOINT. Use the UP or DOWN arrows to adjust the PPM and pH setpoints. To save the new setpoint value and exit, press SETPOINT again.

The controller then automatically activates the chemical feeders for sanitizer and acid (or soda) feed, as required to maintain the set PPM and pH levels - regardless of fluctuations in bather load, contamination and weather. Like a thermostat maintaining a constant temperature, it prevents overfeeding or underfeeding, both of which are detrimental to good water quality.

ALARMS

When there is an alarm condition, the corresponding display flashes the alarm value:

PPM out-of-range,

pH out-of-range,

PPM overfeed,

pH overfeed.

The display stops flashing when the condition is corrected. To reset the overfeed timers, turn the feed mode to off and then back to Manual or Auto.

RESET

The ideal values are set as default values. They can be adjusted by the operator at any time. To reset all factory default values, press PPM and pH for 5 seconds.

SPECIFICATION

FREE CHLORINE CONTROL	Adjustable from 0.1 to 10.0 ppm (mg/l) or 0.01 to 2.0 (specify).
pH CONTROL	Adjustable from 4.0 to 10.0
FREE CHLORINE SENSOR	Solid state electrode with 10-ft (3 m) cable
pH SENSOR	Glass electrode with 10-ft (3 m) cable
READOUTS	PPM (3 digits) and pH (2 digits) LEDs
FEED MODES	Manual, automatic, proportional
ADJUSTMENTS	Setpoint, calibration, limits, feed rate
INDICATORS	LEDs for feed mode, feed status, alarms
SAFETY	Audio, visual and remote alarms Out-of-range limits and overfeed safety timers
CABINET	Polystyrene 9x7x4 in. (22x18x10 cm)
ELECTRICAL	110V, 230V or 24 VAC (specify)
PLUMBING	PVC tees for 1-1/2" or 2" line
WARRANTY	5 years on electronic module 1 year on all other parts
SHIPPING	12x12x12-in (30x30x30 cm) carton 8 lbs (3 kg) without pumps 16 lbs (6 kg) with 2 chemical feed pumps

A SOUND INVESTMENT

The CHEMTROL 255 controller is based on 20+ years of experience in pool and spa automation with over 25,000 installations worldwide. Featuring a 5-year electronics warranty, it actually pays for itself in 1 to 2 years through cost savings in operating and maintenance expenses.

Savings continue to accrue from the more efficient use of chemicals, avoiding over- and underfeeding, and from lower labour costs for water testing and repairs of damaged equipment. In particular, commercial operators save on speciality chemicals, customer complaints and health department shutdowns.

Download PDF brochure of our Epic Chemtrol Chemical Controllers