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Chemtrol 250 Digital Controller
pH & ORP Controller
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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 |
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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
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
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Installation of the CHEMTROL 250 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 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.
- 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
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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:
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pH calibration from 4 to 10,
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ORP setpoint from 400 to 900 mV,
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pH setpoint from 4 to 10,
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ORP and pH feed modes: off, manual, automatic,
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ORP and pH proportional control bandwidth from 0 to 100% of the setpoint,
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ORP high and low alarms from 400 to 900 mV,
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pH high and low alarms from 4 to 10,
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ORP overfeed safety timer from 0 to 999 minutes,
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pH overfeed safety timer from 0 to 99 minutes.
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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:
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ORP out-of-range,
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pH out-of-range,
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ORP overfeed,
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pH overfeed.
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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 |
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Part # |
Description |
Price |
Order |
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Chem250 |
Chemtrol 250 pH and ORP Chemical Controller |
1,839.00 |
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Back to Chemtrol Automatic
Controllers
Back to Parrish Pools USA On-Line
Catalog
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