Chemical Controllers

To assist in the maintenance of pool water chemistry, automatic water chemistry controllers monitor the chemical makeup of the pool water and then activate feeders to maintain correct levels of bactericide and pH buffer, resulting in constant free chlorine and pH levels.

Chemical controllers do not replace the operators manual water testing.

If desired by the owner, or for remote monitoring of the chemical controller, a dedicated telephone line for a modem should be brought to the chemical controller location.  Electrical should coordinate.

Chemical controller location requires 115 V power.  From the chemical controller to the chlorine chemical feed pump location and the pH adjustment chemical location, a conduit and wiring should be provided from the chemical controller.  All of the pumps or feed systems typically operate off of the power provided to the chemical controller via their 5 amp internal relays.  If equipment exceeds this capacity, separate relays will be required to carry the load.

To meet Electrical code, loose wiring from the chemical controller to either the wiring box at the chemical controller or chemical feed pumps must be run in conduit.

Probe test determines ORP (Oxidation Reduction Potential).  A logarithmic scale is used to convert the ORP reading into a PPM reading.  The water temperature and the pH will affect that ORP reading

Siemens uses HRR instead of ORP.

Health codes do not recognize ORP and HRR.

Chemical controllers need the ability to read pH, ORP, and PPM.  Controllers should have the ability to go into alarm and stop feeding when necessary. 

The PPM reading on the controller is derived from the ORP and pH probe readings.  This is a calculated value.  A probe for reading PPM is available. 

Newer controllers have capabilities to calculate the flow rate, turn the heaters on and off, turn pumps on and off, etc.  They are becoming central processing units.

Most controllers can also calculate the Langelier Index, or the Ryzner Index (Strantrol) which gives a value to the aggressiveness of the water.

Total Alkalinity and Calcium Hardness readings must be entered manually because they cannot be tested by probes.

Controllers should have the capability to store chemical data in their memory, typically up to 999 data points.  The pool operator should be able to download this at the controller or remotely.  Controllers with LAN capabilities allow the operator to make changes to the pool chemistry remotely.

If the owner desires that chemistry controller annunciation and/or printing of water chemistry reports, additional conduit and wiring may be required.  This approach is not generally common, but should be confirmed with the owner.  Usually, controller information is available via modem directly from the controller.  For this purpose, a phone line can be run to each chemistry controller modem.  The phone line is typically per electrical.

Controllers also allow remote communication thru the internet.  Some controllers offer this communication as wireless internet based.

The CH master spec is written around the Chemtrol PC 3000 controller.  CH currently accepts BECSys 5, CAT 5000, Siemens Impact, and Acu-trol AK 600 as approved equals.

It is possible to interface the pool water chemistry controller with the building automation system (BAS) so that water analysis can be monitored, along with other functions, with a PC located in the pool office.

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