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Chemtrol 250 Digital Controller
pH & ORP Controller

Chemtrol 250

ORP/pH  Digital CONTROLLER

A Simple and Inexpensive Controller for:

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Residential Pools and Spas

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Commercial Pools and Spas

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Hotels, Motels, Condos, & Swim Clubs

SANITIZER AND pH CONTROL MADE EASY

The CHEMTROL 250 is a microprocessor-based digital controller designed to maintain both sanitizer ORP (oxidation-reduction potential or Redox) and water pH in high-end residential pools, small commercial pools and spas and light industrial applications.

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

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Easy to Install

bullet Simple to use
bullet All Control Functions on Front Panel
bullet Separate Adjustable Setpoints
bullet Separate Adjustable Alarms
bullet Acid/Base Selector
bullet Proportional Feed with Adjustable Bandwidth
bullet Separate Adjustable Overfeed Safety Timers
bullet Waterproof Cabinet with Clear Window Cover
bullet 5-year Electronics Warranty
bullet Toll-Free Technical Support

A SOUND INVESTMENT

The CHEMTROL 250 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 labor costs for water testing and repairs of damaged equipment. In particular, commercial operators save on specialty chemicals, customer complaints and health department shutdowns.

EASY TO INSTALL



Installation of the CHEMTROL 250 is as easy as 1-2-3.

  1. 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.
  2. SENSORS - Install the ORP 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.
  3. CHEMICAL FEEDERS - Connect the chemical feeders to the 110 or 230V controller outputs, according to the manufacturer's 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.

 Simple to Operate



The CHEMTROL 250 ORP/pH Digital Controller automatically maintains both sanitizer ORP (oxidation-reduction potential or Redox) 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:

bullet pH calibration from 4 to 10,
bullet ORP setpoint from 400 to 900 mV,
bullet pH setpoint from 4 to 10,
bullet ORP and pH feed modes: off, manual, automatic,
bullet ORP and pH proportional control bandwidth from 0 to 100% of the setpoint,
bullet ORP high and low alarms from 400 to 900 mV,
bullet pH high and low alarms from 4 to 10,
bullet ORP overfeed safety timer from 0 to 999 minutes,
bullet pH overfeed safety timer from 0 to 99 minutes.

To select a function, simply press ORP 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 ORP control level is 700 mV, based on WORLD HEALTH ORGANIZATION (WHO) and NATIONAL SPA AND POOL INSTITUTE (NSPI) values for prevention of germs and bacteria.

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 ORP or pH and then SETPOINT. Use the UP or DOWN arrows to adjust the ORP 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 ORP 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:

bullet ORP out-of-range,
bullet pH out-of-range,
bullet ORP overfeed,
bullet 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 ORP and pH for 5 seconds.

SPECIFICATIONS

ORP CONTROL

Adjustable from 400 to 900 mV

pH CONTROL

Adjustable from 4.0 to 10.0

ORP SENSOR

Platinum electrode with 10-ft (3 m) cable

pH SENSOR

Glass electrode with 10-ft (3 m) cable

READOUTS

ORP (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

 

Part # Description Price Order
Chem250 Chemtrol 250 pH and ORP Chemical Controller 2195.00

                                                     

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