SECTION - SWIMMING POOL WATER CHEMISTRY CONTROL
1.01 SUMMARY
A. A CHEMICAL AUTOMATION SYSTEM shall be supplied for continuous
monitoring of water chemistry and for automatic control of the active sanitizer and pH
levels in the swimming pool or spa.
B. The system shall be a CHEMTROL™ 250 DIGITAL CONTROLLER
of current design and production model manufactured by Santa Barbara Control Systems or a
technically equal system certified by the specifying agent as capable of providing equal
performance for all operating functions. C. Exceptions to the specifications shall be
described in detail together with a list of ten (10) similar operating systems of same
model and manufacture, with the name, address and telephone number of operating personnel.
1.02 SPECIFICATIONS
A. CHEMISTRY CONTROLLER
1. The controller shall be microprocessor based and shall feature
separate digital readouts for ORP and pH. All instrumentation shall be enclosed in a
watertight non-metallic cabinet with a clear window cover. All operating controls,
calibration adjustments and safety alarm settings shall be accessible from the front
panel.
2. The control system shall automatically activate the appropriate
chemical feeders in order to maintain the Oxidation-Reduction Potential (ORP) of the Free
Active Sanitizer level within +/- 10 millivolts (mV) and the pH within +/- 0.1 of the
set points selected by the operator. Setpoint selection shall be by direct dialing on
scales calibrated in mV of ORP and in pH units.
3. The control system shall include the following feed modes: off,
manual, automatic and proportional. The feed rate in the proportional zone shall be
adjustable by the changing the bandwidth of the zone from 1% to 100% of the
set point
value.
4. The face panel shall feature two LED digital readouts for mV of
ORP and for pH units. Calibration of the pH display shall be adjustable from the front
panel, using a standard chemical test kit for pH. ORP requires no calibration.
5. Audible, visual and remote alarms shall be activated by high/ low
pH or sanitizer conditions and by the overfeed safety timers. All alarm settings shall be
adjustable from the front panel. An interlock jumper shall prevent sanitizer feeding if
the pH is below 7.0 or above 8.0.
6. All electronics shall be mounted on a single enclosed, plug-in PC
board and shall be coated with a corrosion-proof coating. The sanitizer and pH sensors
shall be potentiometric. The sanitizer sensor shall be a sealed combination
oxidation-reduction potential (ORP) electrode with a platinum ring having a minimum area
of 0.5 cm2. The pH sensor shall be a sealed combination glass electrode.
B. OPTIONS
1. OPTION FCA: The OR and pH sensors shall be mounted in a
see-through flow cell with a clear cover, pre-assembled with a water spigot and two (2)
ball valves.
C. WARRANTY
1. The controller electronics shall be covered by a standard
manufacturer warranty of five (5) years. Special extensions of more limited warranties
shall not be considered acceptable. All sensors will be covered by a standard one (1) year
warranty. Other parts shall be covered by their own manufacturer's warranty. 2. The
manufacturer shall supply a complete instruction, operating and maintenance manual.
