Astral Pool HALO ORP User manual

halo®pH and Gold
Chlorine ORP Sensors
PRESS TO PAIR
Handle gently
when cleaning
525150
Acid Sensor
pH
pH
PRESS TO PAIR
Handle gently
when cleaning
525148
Gold Tip
Chlorine
Sensor
Cl
H0770500_REVA
INSTALLATION MANUAL
FOR YOUR SAFETY ‑ This product must be installed in accordance with AS/NZ 3000 ‑ 2018 and any other local
applicable regulations. Before installing this product, read and follow all warning notices and instructions that
accompany this product. Failure to follow warning notices and instructions may result in property damage,
personal injury, or death. Improper installation and/or operation will void the warranty.
Improper installation and/or operation can create unwanted electrical hazard which can cause serious injury,
property damage, or death.
WARNING

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HALO®pH and Gold Chlorine ORP Sensors Installation and User Manual
EQUIPMENT INFORMATION RECORD
DATE OF INSTALLATION
INSTALLER INFORMATION
LIGHTING CONTROLLER MODEL
SERIAL NUMBER
For full warranty terms and conditions and to register your
warranty, visit www.astralpool.com.au/warranty and complete
your details. Or scan the QR code to go directly to the
registration page
Record your equipment details here for quick reference:
Model No. : ____________________________________
Serial No. : ____________________________________

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HALO®pH and Gold Chlorine ORP Sensors Installation and User Manual
Table of Contents
Section 1. Important Safety Instructions ...........................................4
Section 2. Installation................................................................................5
2.1 Configuring the Halo Chlorinator to use pH and Gold Chlorine
ORP sensors......................................................................................................................5
2.2 Calibrating pH and Gold Chlorine ORPsensors ..................................................6
Section 3. User Manual.............................................................................6
3.1 pH.........................................................................................................................................6
3.2 Gold Chlorine ORP sensors.........................................................................................7

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HALO®pH and Gold Chlorine ORP Sensors Installation and User Manual
Section 1. Important Safety Instructions
READ AND FOLLOW ALL INSTRUCTIONS
All electrical work must be performed by a qualified installer and conform to all national, state, and local codes.
When installing and using this electrical equipment, basic safety precautions should always be followed, including
the following:
WARNING
Risk of electric shock - Install the controller at least 3.5 metres from the inside wall of the pool and/or hot tub using
non‑metallic plumbing.
SAVE THESE INSTRUCTIONS
WARNING
If the supply cord is damaged, it must only be replaced by AstralPool, its service agent or a similarly qualified person, in
order to avoid a hazard.
The transformer is not intended for series/parallel connection.
Never connect more than one light to a single power supply outlet. Each outlet on the power supply must go to one – and
one only – underwater light.
WARNING
The Halo Chlorinator power supply has an IP23 rating, meaning it is suitable for installation outdoors. For safe operation
the power supply must be installed in the correct orientation, with the cables leaving from the bottom of the device. If
installing the power supply near the pool or spa water, you must ensure that the rules of AS3136 are followed at all times.
AstralPool® strongly recommends that installation be performed by a registered pool builder, electrician or other suitably
qualified person.

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HALO®pH and Gold Chlorine ORP Sensors Installation and User Manual
Section 2. Installation
Halo Chlorinators can communicate to a pH sensor
and a Gold Chlorine ORP sensor. (As ORP is dependent
on pH, a Gold Chlorine sensor can only be installed if a
pH sensor and acid dosing pump are installed)
Halo pH and Gold Chlorine ORP Sensors are mounted
into a sensor mounting chamber. This chamber can
be installed in a horizontal or vertical orientation and
must be plumbed into the pool system pipework after
the filter but before the chlorinator cell. Ideally the
chamber should be mounted as far away as possible,
upstream from the Chlorinator cell.
NOTE: Ensure that the Chlorinator cell cable or any
other electrical cable doesn’t contacting the
probes or probe chamber.
The sensors are wireless and communicate via
Bluetooth to the Halo Chlorinator, so must be located
within 5 m of the Halo Chlorinator power supply.
If an acid dosing pump is being installed, the acid
injection point (where the acid goes into the pool
water) must be mounted into the pipework, after
the chlorine cell and all other equipment. Ideally the
chamber should be mounted as far away as possible,
downstream from the Chlorinator cell.
Acid
injection
point
2.1 Configuring the Halo Chlorinator to use
pH and Gold Chlorine ORP sensors
From the“Home” screen of the Halo Chlorinator, press
the “Settings” icon
From the“Home” screen of the Halo Chlorinator, press
and then press the “Install” icon
to display the Install page.
Press the “Add/Remove”button and select “pH Sensor”.
To pair the sensor to the Halo Chlorinator, press the
round button (on the sensor label) under“Press to Pair”.
If a pH sensor and an acid dosing pump have been
configured (See acid dosing pump instructions), then
a Gold Chlorine ORP sensor can also be paired to the
Halo Chlorinator using the “Add/Remove” button and
choosing “ORP Sensor”.

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HALO®pH and Gold Chlorine Sensors Installation and User Manual
2.2 Calibrating pH and Gold Chlorine
ORPsensors
The pH and Chlorine sensors may require periodic
calibration.
From the“Home” screen of the Halo Chlorinator, press
the settings Icon
From the“Home” screen of the Halo Chlorinator, press
and then press the “Maint” icon to
display the maintenance page.
Press the “Calibrate Sensors”button to enter the
calibration mode.
Within the calibration screen there is an option to “Run
the pump during calibration”.
• If the sensors are still in place in the pool pipework,
then the pump should be run during calibration.
To ensure that the pool water is thoroughly mixed,
it is advisable to run the filter pump for at least an
hour before performing a calibration.
NOTE: See note on ORP calibration below.
• If the sensors have been removed and placed into
calibration fluid, then the pump should not be run
during calibration.
For pH sensors, if you notice that your pH
measurement is slightly different from your Pool
Shops (or a test strip etc) measurement then you can
use the “Run the pump during calibration” option
and adjust the sensor reading up or down to match
the other reading. (Alternatively, you can choose
to not run the pump during calibration and use pH
calibration fluid to calibrate the pH probe. Calibration
fluid is available from AstralPool® dealers.)
For ORP sensors, the differences in pool chemistry
(salt level, pH, cyanuric acid “stabiliser”, hardness,
etc.) makes comparisons between the ORP level
and measured free chlorine (chlorine ppm) levels
extremely difficult. Because of this, calibrating the
ORP sensor using the pool water is of little value, so
if you wish to calibrate (or check the performance)
of the ORP sensor then the “Run the pump during
calibration”option should not be used and the ORP
sensor should be removed from the pipework and
calibrated using calibration fluid. (Calibration fluid is
available from AstralPool dealers.)
Section 3. User Manual
Halo pH and Gold Chlorine ORP sensors are designed
to help keep your pool water in balance, however
regular water tests (preferably from your local pool
shop) should be conducted and compared to the
sensor measurements.
3.1 pH
pH is a measure of acidity of the pool water. As
chlorine is produced, the acidity of the water changes
and the pH rises. The pH sensor senses this change
and signals the acid dosing pump to add acid to the
pool water to keep it in balance.
The pH level is displayed on the “Home” page in the
centre of the screen, below the menu bar.
When the filter pump is off, the pH sensor doesn’t
take any measurements and the display will show the
last measurement as pH was XX. When the pump has
been running the pH is displayed as pH is XX. (New
measurements aren’t displayed for 3 minutes after the
pump starts.)
• For fibreglass pools a pH level between 7.2 and 7.4
is recommended.
• For all other pools a pH level between 7.4 and 7.6
is recommended.
From the“Home” screen of the Halo Chlorinator, press
the “Settings” icon
From the“Home” screen of the Halo Chlorinator, press
and then press the “Settings”
icon, in the top ribbon, to display the Settings page.
The pH sensors occasionally need calibration. See
installation instructions for details.

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HALO®pH and Gold Chlorine Sensors Installation and User Manual
3.2 Gold Chlorine ORP sensors
ORP (Oxidation Reduction Potential) is a measure
of the pool water’s ability to disinfect (sanitise) by
inactivating micro‑organisms and oxidising organic
materials. The Gold Chlorine ORP sensor senses the
ORP of the water and signals the Halo Chlorinator
to generate an appropriate amount of chlorine to
sanitise the pool water.
The chlorine level is displayed on the “Home” page,
in the centre of the screen, below the menu bar. The
level is shown as“Low”, “OK” or “High”.
When the filter pump is off, the ORP sensor doesn’t
take any measurements and the display will show the
last measurement as chlorine was XX. When the pump
has been running the ORP is displayed as chlorine is
XX. (New measurements aren’t displayed for 3 minutes
after the pump starts).
There are many factors that affect ORP readings such
as filter pump run time, pH, salt level and cyanuric
acid. Cyanuric acid suppresses the ORP (chlorine)
reading. Whilst many suppliers will recommend
up to 50 ppm of cyanuric acid (CyA), AstralPool®
recommends a maximum of 20 ppm cyanuric acid on
Halo Chlorinators (the lower the better, remembering
that fresh chlorine is produced everyday).
Generally, an ORP level of 700 is a good starting point.
When the pool is first installed, it is advisable to take
weekly measurements of free chlorine. If the free
chlorine level is too low, increase the ORP set point
(reduce the setpoint to reduce the free chlorine).
When making adjustments it is advisable to make
small changes (e.g. 700‑715) and then wait 2 or 3 days
before retesting the free chlorine.
It is also advisable to check that the filter pump
is running for enough time to allow for chlorine
generation. From the“Home”screen of the Halo
Chlorinator, press the “Settings” icon
generation. From the“Home”screen of the Halo
and then
press the “Stats” icon in the top ribbon to display the
“Stats” page. On this page the “% Cell Output” shows
the percentage of time that the cell is operating at full
capacity. If this figure is above 80%, it is advisable to
increase the filter pump run time. (Similarly, in the off
season, this figure can be used to allow you to reduce
the filter pump run time, however you also need
to allow enough time to filter out debris and skim
leaves, etc.)
The display of chlorine is “Low”, “OK” or “High” is based
on how far the ORP is from the setpoint, so the water
analysis could show that the free chlorine level is low
whilst the chlorinator is showing chlorine is OK, if this
is the case, the ORP setpoint should still be adjusted in
small steps as above.
Setting the ORP set point is done on the same page as
setting the pH set point. (See above.)
Halo pH and Gold Chlorine ORP sensors are powered
by a long‑life battery that should last 5 years. To
provide peace of mind, the battery level is indicated
via the Install page.
From the“Home” screen of the Halo Chlorinator, press
the settings Icon
From the“Home” screen of the Halo Chlorinator, press
and then press the “Install” icon
on the top ribbon to display the“Install” page. On the
lower left corner of the install page, press the “Add/
Remove”button and the ORP and/or sensors will be
displayed (along with other installed devices). In the
example below, the battery is shown with 2 “bars”.
At this stage, the battery life is approximately 1 year.
When the display shows 1 “bar”, the battery life is
approximately 1 month.
The graphic on the left side of the image is the signal
strength of the sensor.

©2021 Fluidra S.A. All rights reserved. This document is subject to change without notice.
H0770500_REVA
Fluidra Group Australia Pty Ltd
219 Woodpark Road
Smithfield NSW 2164, Australia
1 300 186 875
www.astralpool.com.au