IPS Controllers M790 User manual
M790 pH/ORP Controller
Owner’s
Manual
Table of Contents
I. Introducon page 2
A. Water Chemistry page 2
B. Safety page 3
C. System Components page 4
D. Specicaons page 7
E. Controller Panel Descripons page 8
F. Electrical Descripons page 10
II. Installaon page 11
A. Setup page 11
B. Tools page 11
C. Procedure page 11
III. Operaon page 14
A. Startup and Shutdown page 14
B. Modes and Adjustments page 15
C. Maintenance page 21
IV. Troubleshoong page 23
V. Warranty page 26
1
I. Introducon
A. Water Chemistry
Water chemistry is a complex science that contains many variables.
These variables not only aect the water environment itself, but
they can have adverse eects on your equipment as well as your
health. These are only some of the factors which we follow closely
to ensure the most healthy water interacons:
pH is the measurement of the acidity or basicity in an aqueous
soluon. A measurement below 7 is considered acid, while a
measurement above 7 is base or alkaline. It is a signicant factor
in determining the water quality as it aects sanizer levels, water
color, and human reacon to the water.
ORP (Oxidaon Reducon Potenal) is the measurement of the
oxidizing capacity present in water. ORP cannot be fooled by the
eects of pH, total dissolved solids (TDS), stabilizers, and non-chlo-
rine oxidizers. A typical ORP sensor measures Hypochlorous Acid
(HOCI), which is the more eecve component of free chlorine. A
higher ORP reading equates to the sanizer working more eec-
vely.
Water balance is comprised of pH, calcium hardness, total alkalin-
ity, temperature, and TDS. When water is balanced, the Langelier
saturaon index is 0. Values above +0.3 lead to scaling and cloudy
water, while values below -0.3 can cause corrosion of pool equip-
ment and surfaces. If the water balance is not xed in a mely
manner, secondary eects can lead to rapidly declining water con-
dions that can aect the health of the water occupants.
pH and ORP work conversely to one another, and are aected by
other factors such as temperature and TDS’ that can increase the
negave impacts of unbalanced water.
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M790 pH/ORP Controller Owner’s Manual
B. IMPORTANT SAFETY INSTRUCTIONS
1. READ AND FOLLOW ALL
INSTRUCTIONS.
2. Risk of electric shock: Connect the controller to a dedicated
ground-fault circuit interrupter (GFCI) circuit breaker.
3. Disconnect power before servicing the controller.
4. Inspect all power cords frequently. Any damaged cords should
be replaced immediately to reduce the risk of injury by shock.
5. Always maintain a record of manual water chemistry readings
using an accurate test kit.
6. WARNING — To reduce the risk of injury, do not
permit children to use this product unless they are closely
supervised at all mes.
7. Danger — Risk of injury.
a. Replace damaged cord immediately.
b. Do not bury cord.
c. Connect to a grounded, grounding type receptacle only.
8. WARNING — Risk of electric shock. Install at least
5 feet (1.5m) from inside wall of water enclosure using non-
metallic
plumbing.
9. Operaon of this controller without a funconing ow-switch
will void the NSF Cercaon.
10. WARNING — Do not install this controller where it is
accessible to the public.
11. SAVE THESE INSTRUCTIONS.
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M790 pH/ORP Controller Owner’s Manual
C. System Components
1. IPS M790 pH/ORP Controller
a. Allows automac monitoring of pH and ORP levels through
a simple, user-friendly interface, resulng in easier
management of water balance in swimming pools, spas, or
circulang water environments.
b. Can be easily installed into your exisng pool environment
and equipment, or can be customized to your needs.
c. Monitors and displays the pH and ORP levels using LEDs
and digital readouts on the front panel.
In addion, four separate funcon buons allow simple
pushbuon control of these individual parameters:
1) Mode - Auto, pH Standby (programming), ORP Standby
(programming),
2) Set Level - pH or ORP level to be maintained,
3) Dose Timer - Timed or connuous feed modes,
4) pH Cal - pH calibraon for variaon in pH sensors.
d. If the pH level falls below (base feed) or rises above (acid
feed) the preset level, then the controller will acvate the
chemical feeder unl the preset level is reached.
e. If the ORP (sanizer) levels reach the preset set level, then
the controller will acvate the chemical feeder unl the
preset set level is reached.
2. Flow Cell with Switch
a. An injecon-molded ow cell with integrated ow-switch
houses the pH and ORP sensors, and partners with the
M790 controller to monitor the pH and ORP levels in the
water.
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M790 pH/ORP Controller Owner’s Manual
b. The ow switch veries that water is owing during a feed
cycle, and sends the controller instrucons to deacvate
the feed if water is not owing.
c. Operaon of this controller without a funconing ow-
switch will void the NSF Cercaon. Rounely check that
the ow-switch is funconing by closing the le valve on
the boom of the ow-cell (ow light should turn o).
3. pH and ORP Sensors
a. pH Sensor – standard (Use only IPS Controllers part # SXPH
to maintain NSF Cercaon)
b. ORP Planum Sensor – standard (Use only IPS Controllers
part # SXORP to maintain NSF Cercaon)
c. ORP Gold Sensor - for use with Salt Chlorine systems
(Use only IPS Controllers part # SXORP-G to maintain NSF
Cercaon)
4. Fings – for tapping installaon of ow cell input/output
5. In-line Filter – installed prior to ow cell to protect switch and
sensor
6. Tubing – 25 feet of 3/8” for providing ltered water to and from
the ow cell
7. Feeders – peristalc pumps for acid for controlling pH, and
chlorine for controlling ORP (purchased separately)
8. Mounng Board – ABS plasc with mounng holes and stain-
less hardware (16” x 12” standard, 24” x 19” oponal)
9. Check Valve/Injector – qty. 1 each (for use with oponal pumps)
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M790 pH/ORP Controller Owner’s Manual
Figure 1: This is a typical installaon using IPS’ system package, which consists of an
M790 pH/ORP Controller, ow cell with switch, and two pumps mounted on the large board.
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M790 pH/ORP Controller Owner’s Manual
* not shown
Chemical
Pump
Chemical
Pump
Sucon Line
FLOW
FLOW Effluent
(to Sucon)
Waste
Influent (to Return Line)
Filter
Pump
FLOW
FLOW
FLOW
Sample
Typical Installaon
Note: All chemical must be injected downstream from
the heater and flowcell.
Main Drain and Skimmer
Pressure Differenal
FLOW
Return Line
FC100G
FLSW
SXPH
SXORP
SXORP-G
Valve
Jaco Fing 1/2”
Jaco Fing 1/4”
38tubing
Filter
1
2
3
4
5*
6
7
8
9
10
Flow Cell, Complete
Flow Switch Only
pH Sensor
ORP Sensor (Standard
Planum Tip)
ORP Sensor (Gold-Tip
for Salt Pools)
2-way Flow Cell Valve
1/2” Jaco fing for
sensors
1/4” Jaco fing for
tubing
3/8” tubing for
plumbing to/from
Flow Cell
Filter Strainer
IPS Parts List
Flowcell (1)
Filter
(10)
pH sensor (3)
ORP
Sensor
(4)
Flow
Switch
(2) 1/2” Jaco Fing (7)
38tubing (9)
Valve (6)
1/4” Jaco Fing
(7)
Controller
D. Specicaons
Enclosure: 7.5”L x 4.75”W x 2.75”D (Note: Mounng board
dimensions are 16”L x 12”W x 0.25”D)
Electrical Input/Output: 120 VAC, 50 - 60 Hz
pH Set Level: 7.0 to 8.0
ORP Set Level: 400 mV to 900 mV
Dose Timer: O, Connuous, or Timed cycle
High Alert: pH default of 8.0, ORP default of 900
Low Alert: pH default of 7.0, ORP default of 100
Readout: Funcon LED and numerical digital displays
Alarm: Red alert LEDs
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M790 pH/ORP Controller Owner’s Manual
E. Controller Panel Descripons
1. Digital Displays and Funcon LEDs
a. pH
1. Alert - red LED
2. Dose - green LED
b. ORP
1. Alert - red LED
2. Dose - yellow LED
Figure 2: M790 Controller Components Connecons
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M790 pH/ORP Controller Owner’s Manual
digital display
pushbutton
LEDs
Controller Communication
ORP
pH
2. Mode - pushbuon adjustments
a. Auto - red LED
b. pH standby - green LED
c. ORP standby - yellow LED
d. OFF mode - In standby, press and hold Mode buon for 3
seconds to turn controller o.
3. Flow - green LED
4. Set Level – pushbuon adjustments
5. Dose Timer – pushbuon adjustments
6. pH Cal – pushbuon adjustments
7. Electrical Connecons (peripherals)
a. pH output (le receptacle) - max. 5 amps @ 120 VAC
b. ORP output (right receptable) - max. 5 amps @ 120 VAC
c. AC power - 120 VAC, 50-60 Hz
d. Flow - from ow cell
e. pH sensor - BNC connecon
f. ORP sensor - BNC connecon
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M790 pH/ORP Controller Owner’s Manual
F. Electrical Descripons
1. Power
a. 120 VAC, 50-60 Hz, 3-wire grounded NEMA 5 power cord.
GFCI source required.
2. Dip Switches (1-4)
a. 1: pH/ORP interlock (default: OFF)
No ORP feed if pH is feeding (ON).
b. 2: pH/ORP alert interlock (default: ON)
No ORP if pH is in alert mode (ON).
c. 3: Acid/Base default acid (default: OFF)
1. Feed base chemical when pH level falls below set point.
(ON)
2. Feed acid chemical when pH above set point. (OFF)
d. 4: Overfeed Timer ON/OFF (default: ON)
Note: Turning o the Overfeed Timer will void any NSF
Cercaon.
Figure 3: Dipswitches
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M790 pH/ORP Controller Owner’s Manual
II. Installaon
A. Setup
1. Turn o all peripheral equipment such as heaters, chemical
feeders, and pumps.
2. Relieve pressure from the ltraon system.
B. Tools
1. Cordless drill
2. 1/4” NPT Tap
3. 7/16” drill bit
4. Masonry drill bit and anchors, or other appropriate fasteners
5. 13/16” wrench or channel-lock pliers
C. Procedure
1. Locaon
a. Wall area with easy access
b. Within 8 feet of feeder
c. At least 10 feet from water edge
d. Close proximity to me clock
e. Within 6 feet of GFCI power source
2. Mounng
Note: The controller and ow cell are factory mounted to the ABS
board for convenience.
a. Securely mount ABS mounng board with M790 controller
and ow cell on wall (vercal installaon).
b. If applicable, securely aach the peristalc pump with the
provided hardware.
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M790 pH/ORP Controller Owner’s Manual
c. Drill a 7/16” hole and tap a 1/4” NPT port to a locaon
downstream from the lter and upstream from any
chemical introducon points. Install a tubing connector
(included) and ex tubing to be connected to the le
side ow cell port containing the ow switch. The in-line
lter will also be installed in this line and mounted to a
horizontal pipe with band clamps (included). Note: Verify
that the lter is installed with direconal arrows poinng
in the direcon of the ow.
d. Drill a 7/16” hole and tap a 1/4” NPT port to a locaon that
is subject to vacuum or reduced pressure. Install a tubing
connector (included) and ex tubing to be connected to
the right side ow cell port. Note: We recommend that
this tubing connector be installed into the drain hole on
the sucon side of the pump for best performance.
e. Cut a 3” - 6” length of ex tubing and insert into the ow
cell’s sample stream port (center).
3. pH and ORP Sensors
Note: Carefully unpack the pH and ORP sensors and set aside in a
clear area unl ready to install into the ow cell.
a. Verify that the M790 controller power is OFF.
b. Carefully remove the plasc protecve caps from the
sensors and store in a separate locaon for future re-use.
c. Slide the glass end of each sensor (pH and ORP) into their
corresponding compression ngs located at the top of
the ow cell. Ensure that the p is submerged into the
water to within 1/2” from the boom of the ow cell.
Hand ghten each nut ng.
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M790 pH/ORP Controller Owner’s Manual
4. Electrical Connecons (Should be completed by a licensed
Electrician)
a. Verify that the M790 controller power is OFF.
b. Connect the pH feeder connecon to the appropriate
peristalc pump or other device.
c. Connect the ORP feeder connecon to the appropriate
peristalc pump or other device.
d. Connect the AC power cord to a GFCI power source. For
outdoor installaons, ensure the use of a waterght outlet
cover.
e. Connect the ow switch to the screw terminals inside the
controller (labeled Flow). Wire jumper should be removed
and stored for later use during trouble-shoong.
f. Connect the pH sensor connector to the corresponding
port (labeled pH) at the right edge of the controller.
g. Connect the ORP sensor connector to the corresponding
port (labeled ORP) at the right edge of the controller.
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M790 pH/ORP Controller Owner’s Manual
III. Operaon
A. Startup and Shutdown
1. Startup
a. Plug M790 power cord into power outlet. For outdoor
installaons, ensure the use of a waterght outlet cover.
b. Turn on the lter pump and verify the water ow through
the ow cell by opening the sample port valve (center)
and observing a steady stream of water. The right side
valve may need to be parally closed to produce a steady
stream. Note: Water should pass over the pH and ORP
sensors for a minimum of 10 minutes to allow for accu-
rate, stable readings of pH and ORP levels from the pool
or spa.
c. Check for leaks and repair if necessary.
d. Manually adjust and balance the pool or spa water to
acceptable ranges using a test kit. Note: Use a DPD based
test kit to check the chlorine level.
e. Verify that the green Flow LED is illuminated. Both the pH
and ORP dose outputs are disabled if there is no water
ow.
f. Press the Mode pushbuon momentarily to place the
controller into the pH standby mode. The green pH
standby LED will illuminate. Select the desired pH set level
and dose me (connuous or med).
g. While sll in the pH standby mode, press the pH Cal
pushbuon to calibrate the reading to the value observed
through the manual tesng of the water. Note: Always
calibrate using water from the sample port of the ow
cell.
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M790 pH/ORP Controller Owner’s Manual
h. Press the Mode pushbuon momentarily to place the
controller in ORP standby mode. The yellow ORP standby
LED will illuminate. Select the desired ORP set level and
dose me (connuous or med).
i. Press the Mode pushbuon momentarily unl the red
Auto LED is illuminated. Note: If pH level in the pool is at
desired set level, and chlorine/bromine level is at desired
PPM level in the pool, the ORP set level should be the
same as the current ORP reading when in Auto Mode.
2. Shutdown
Note: Each me the Mode pushbuon is momentarily pressed,
the mode will cycle from Auto to pH Standby to ORP Standby, and
then return to Auto mode.
a. Press the Mode pushbuon momentarily to place the
controller in pH standby mode. The green pH standby LED
will illuminate, and both the pH and ORP digital displays
will show dashes.
b. Press and hold the Mode pushbuon for 2 seconds unl
both the pH and ORP digital displays read OFF.
c. Release the Mode pushbuon. The M790 controller will
turn o, and the digital displays and funcon LEDs will go
blank. The green Flow LED will be illuminated if water is
owing through the ow cell.
B. Modes and Adjustments
1. Auto
a. This is the normal operaonal mode of the M790
controller.
b. The controller allows full operaon and monitoring of both
pH and ORP levels.
c. No funcon pushbuons are operaonal in this mode.
d. The red funcon LED next to Auto is illuminated.
e. pH and ORP digital displays monitor the sensor input
levels.
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M790 pH/ORP Controller Owner’s Manual
2. pH standby
Note: While in this mode, the green pH standby LED will
illuminate, both the pH and ORP digital displays will show
dashes, and all Auto funcons will be disabled. When a funcon
pushbuon is pressed, the corresponding digital display will show
the funcon.
a. Set Level
1. Default: 7.4 pH
2. Selectable range: 7.0 – 8.0 pH (in 0.1 increments)
b. Dose Timer
1. Default: Timed dose of 0.6 second pH feed relay
energized and 5 minutes pH feed relay de-energized.
In the med dose cycle mode, the Dose LED will ash
while dosing and illuminate steadily during the delay
poron of the med cycle. In connuous dose mode,
the Dose LED will ash while dosing.
2. Selectable range: OFF, CON (connuous), and Timed
(0.6 – 900 seconds ON and 5 minutes OFF)
c. Overfeed Timer
1. Preset: 30 med cycles or 120 minutes in connuous
dosing. The over feed mer does not automacally
reset. It must be reset by turning the controller o, then
on.
2. The Overfeed mer is interlocked with the Dose Timer
selecon.
i. If the Dose Timer is set to a med cycle, the Over-
feed Timer will count med feed cycles. When the
preset cycle is reached, the pH digital display will
ash and the pH output relay will de-energize.
- Preset: 30 cycles
ii. If the Dose Timer is set to a connuous feed mode,
the Over Timer will count in minutes.
- Preset: 120 minutes
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M790 pH/ORP Controller Owner’s Manual
3. When the Dose Timer is changed from either med or
connuous feed, the Over Timer is reset to Default.
d. High Alert - Default: 8.0 pH
1. Default: 8.0 pH
2. Selectable range: OFF, 7.5 pH to 8.4 pH (acid feed). A
high alert will occur if the pH level remains above the
High Alert level for 10 connuous minutes, and will
automa¬cally turn o the High Alert when the pH level
falls below the high alert level for 1 connuous minute.
During High Alert, the pH dose output will be disabled.
3. Changing High Alert seng
i. Press Mode buon to enter pH standby
ii. Press and hold Mode buon and then press Set Level
buon (red pH alert LED will come on) release both
buons. You are now in Set Alerts mode.
iii. Use Set Level buon to increase/decrease pH High
Alert
iiii. When nished, press Mode buon to connue
e. Low Alert
1. Default: 7.0 pH
2. Selectable range: OFF, 6.8 pH to 7.4 pH (acid feed). A
low alert will occur if the pH level remains below the
Low Alert level for 10 connuous minutes, and will
automacal¬ly turn o the Low Alert when the pH level
rises above the low alert level for 1 connuous minute.
During Low Alert, the pH dose output will be disabled.
3. Changing Low Alert seng
i. Press Mode buon to enter pH standby
ii. Press and hold Mode buon and then press Set Level
buon (red pH alert LED will come on) release both
buons. You are now in Set Alerts mode.
iii. Use Dose Time buon to increase/decrease pH Low
Alert
iiii.When nished, press Mode buon to connue
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M790 pH/ORP Controller Owner’s Manual
f. pH Cal
1. Default: 0-volt sensor input, displays 7.0 pH
2. Selectable range: With a 0-volt sensor input, the display
is adjustable from 6.1 pH to 7.9 pH.
3. ORP standby
Note: While in this mode, the yellow ORP standby LED will illumi-
nate, both the pH and ORP digital displays will show dashes, and
all Auto funcons will be disabled. When a funcon pushbuon is
pressed, the digital display will show the funcon.
a. Set Level
1. Default: 650 mV
2. Selectable range: 400 mV to 900 mV (in 5 mV
increments)
b. Dose Timer
1. Default: 0.6 second ORP feed relay energized and 5
minutes ORP feed relay de-energized (med dose
mer). In the med dose cycle mode, the dose LED will
ash while dosing, and will illuminate steadily during
the delay poron of the med cycle. In connuous dose
mode, the dose LED will ash while dosing.
2. Selectable range: OFF, CON (connuous), and Timed
(0.6 to 900 seconds ON and 5 minutes OFF)
c. Overfeed Timer
1. Preset: 30 med cycles or 120 minutes in connuous
dosing. The over feed mer does not automacally
reset. It must be reset by turning the controller o, then
on.
2. The Overfeed mer is interlocked with the Dose Timer
selecon.
i. If the Dose Timer is set to a med cycle, the Over-
feed Timer will count med feed cycles. When the
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M790 pH/ORP Controller Owner’s Manual
preset cycle is reached, the ORP digital display will
ash and the pH output relay will de-energize.
- Preset: 30 cycles
ii. If the Dose Timer is set to a connuous feed mode,
the Over Timer will count in minutes.
- Preset: 120 minutes
3. When the Dose Timer is changed from either med or
connuous feed, the Over Timer is reset to Default.
d. High Alert
1. Default: 900 mV
2. Selectable range: 650 mV to 900 mV, no OFF. A high
alert will occur if the ORP level remains above the
High Alert level for 10 connuous minutes, and will
automacally turn o the High Alert when the ORP
level falls below the high alert level for 1 connuous
minute. During High Alert, the ORP1 dose output will be
disabled.
3. Changing High Alert seng
i. Press Mode buon to enter ORP standby
ii. Press and hold Mode buon and then press Set Level
buon (red ORP alert LED will come on) release both
buons. You are now in Set Alerts mode.
iii. Use Set Level buon to increase/decrease ORP High
Alert
iiii. When nished, press Mode buon to connue
e. Low Alert
1. Default: 100 mV
2. Selectable range: OFF, 100 mV to 640 mV. A low alert
will occur if the ORP level remains below the Low Alert
level for 10 connuous minutes, and will automacally
turn o the Low Alert when the ORP level rises above
the low alert level for 1 connuous minute. During Low
Alert, the ORP1 dose output will be disabled.
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M790 pH/ORP Controller Owner’s Manual
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