Superior WATERGUARD WG-702 User manual

Copyright © Chemical Injection Technologies, Inc.
WATERGUARD® WG-702
Water Quality Analyzer &
Controller
User Manual

Copyright © Chemical Injection Technologies, Inc.
Disclaimer
Chemical Injection Technologies does not accept any
responsibilityfor any damage caused to its products by
unauthorized personnel. Use of non-Chemical Injection
Technologies reagents and/or replacement parts will void all
warranties.
No part of this publication may be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any
language or any computer language, in any form or by any third
party, without the prior written permission of Chemical
Technologies.

Copyright © Chemical Injection Technologies, Inc.
Table of Contents
1 General Safety Precautions
............................................................................................... 8
2
Preface............................................................................................................................. 10
2.1 Intended Use
........................................................................................................... 10
2.2 Overview of Chapters .............................................................................................. 10
3 Overview........................................................................................................................... 12
3.1 The WATERGUARD Solution
................................................................................. 12
3.2 Measurements and Features................................................................................... 12
3.2.1 Wireless Management Package* ........................................................................ 13
3.3 System Components ............................................................................................... 13
4 Installation ........................................................................................................................ 15
4.1 Selecting a Location
................................................................................................ 16
4.2 Site Requirements and Installation .......................................................................... 16
4.2.1 Mechanical Installation Requirements ................................................................. 17
4.2.2 Mechanical Installation ........................................................................................ 17
4.3 Plumbing Requirements and Installation ................................................................. 18
4.3.1 Water Supply ....................................................................................................... 18
4.3.2 Colorimeter Drainage........................................................................................... 18
4.4 Electrical Requirements and Installation ................................................................. 19
4.4.1 Connecting the Main Electrical Power ................................................................. 19
4.4.2 Input Switches ..................................................................................................... 19
5 First Time Operation and Calibration ............................................................................... 21
5.1 Installing Additional Sensors
................................................................................... 21
5.1.1 pH, ORP (Redox) and Temperature Measurements ........................................... 21
5.2 Installing Reagents.................................................................................................. 22
5.3 First Time Menu Setup ............................................................................................ 25
5.3.1 WATERGUARD Control Panel ............................................................................ 25
5.3.2 Menus .................................................................................................................. 25
5.3.3 Operator Menu..................................................................................................... 26
5.3.4 Configuring Settings in the Operator Menu......................................................... 28
5.3.5 Technician Menu ................................................................................................. 29
5.3.6 Configuring Settings in the Technician Menu ...................................................... 31
5.4 Calibration................................................................................................................ 31
5.4.1 Chlorine Calibration............................................................................................. 32
5.4.2 pH Calibration ...................................................................................................... 33
5.4.3 ORP (Redox) Calibration ..................................................................................... 34
5.4.4 Temperature Calibration ...................................................................................... 34
5.4.5 Turbidity Calibration ............................................................................................. 35
5.5 Calibration and Initial Operation Checklist .............................................................. 35
6 Routine Operation and Maintenance ............................................................................... 37
6.1 MonitoringWATERGUARD
Alarms......................................................................... 38
6.2 Replacing Reagents ................................................................................................ 39
6.3 Cleaning the Filter.................................................................................................... 41
6.4 Shut-Down and Winterizing..................................................................................... 41
6.5 Start-up and Preventive Maintenance..................................................................... 42
6.5.1 Replacing Pump Head and Tubes....................................................................... 42

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6.6 Troubleshooting ....................................................................................................... 43
6.7 Replacing Components ........................................................................................... 47
6.7.1 Replacing Sensors............................................................................................... 47
6.7.2 Replacing the Temperature Probe ...................................................................... 48
6.7.3 Replacing Reagent Siphons ................................................................................ 48
6.7.4 Replacing the Reagent Level Switch ................................................................... 48
6.7.5 Replacing Reagent Pumps .................................................................................. 48
6.7.6 Replacing the Colorimeter Assembly .................................................................. 49
6.7.7 Replacing the Solenoid Valve.............................................................................. 50
6.7.8 Replacing the Control Panel Module (Electronics Card)..................................... 51
6.7.9 Replacing the I/O Module .................................................................................... 51
6.7.10 Replacing the pH, Redox, and Temperature Card.............................................. 51
6.7.11 Replacing the Colorimeter Card .......................................................................... 52
7 Optional Features ............................................................................................................. 53
7.1 Optional Measurements
.......................................................................................... 53
7.2 Free and Total Chlorine Measurements .................................................................. 53
7.2.1 Installation............................................................................................................ 53
7.2.2 Additional Menus and Settings............................................................................ 55
7.2.3 Total Chlorine Monitoring Setup .......................................................................... 59
7.3 pH, ORP and Temperature Measurements ............................................................. 60
7.3.1 Installation............................................................................................................ 60
7.3.2 pH Calibration ...................................................................................................... 60
7.3.3 ORP Calibration ................................................................................................... 60
7.3.4 Temperature Calibration ...................................................................................... 60
7.4 Conductivity Measurement ...................................................................................... 60
7.4.1 Installation............................................................................................................ 60
7.4.2 First Time Set-up and General Operation ........................................................... 61
7.4.3 Routine Maintenance ........................................................................................... 61
7.4.4 Shut-down and Winterizing.................................................................................. 62
7.5 Flow Meter ............................................................................................................... 62
7.5.1 Installation............................................................................................................ 62
7.5.2 Routine Flow Meter Maintenance and Troubleshooting ...................................... 63
7.6 Modbus Communication Protocol............................................................................ 64
7.7 Communication Options .......................................................................................... 68
7.7.1 Internal 4-20 mA Output ...................................................................................... 68
7.8 Chlorine Shock Mode .............................................................................................. 70
8 Relays and Closed-Loop Control ..................................................................................... 71
8.1 Connecting external equipment to the
relays.......................................................... 71
8.2 Wiring to Dosing Systems ....................................................................................... 71
8.3 Replacing Relays ..................................................................................................... 72
9 Setting Proportional Control............................................................................................. 73
9.1 Proportional Control
Overview................................................................................. 73
9.2 Setting Proportional Factor ..................................................................................
9.3 Setting Pump Period ................................................................................................ 74
9.4 Step by Step Proportional Settings.......................................................................... 75
10 Technical Specifications.............................................................................................. 76

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Table of
Figures
Figure 1: WATERGUARD HG-702
Components .................................................................... 15
Figure 2: MountingWATERGUARD on the Wall
.................................................................... 17
Figure 3: Pressure Reducing
Valve ......................................................................................... 18
Figure 4: Sampling Cell and Colorimeter
Components ........................................................... 19
Figure 5: Reagent Bottle
Labels .............................................................................................. 22
Figure 6: Mixing Indicator Salt into Indicator Fluid
.................................................................. 23
Figure 7: Reagent Bottles and Siphon
Caps........................................................................... 23
Figure 8: Reagent Bottles in
Position...................................................................................... 24
Figure 9: WATERGUARD Control Panel
................................................................................ 25
Figure 10: Sensor Reading After
Calibration........................................................................... 32
Figure 11: Press Tab above Siphon Cover and Pull Bottle
Down........................................... 40
Figure 12: Colorimeter Assembly
Unit ..................................................................................... 49
Figure 13: Solenoid Valve with Colorimeter Module and Sampling
Cell ................................. 51
Figure 14: Replacing All Types of Electronic
Card .................................................................. 51
Figure 15: Free and Total Chlorine
Controller ......................................................................... 54
Figure 16: Relay positions on
board ........................................................................................ 71
Figure 17: Proportional Control of Chemical
Dosing ............................................................... 73
Figure 18: P-factor computation example
............................................................................... 74

Copyright © Chemical Injection Technologies, Inc.
Table of Tables
Table 1 - Control panel
structure ............................................................................................. 25
Table 2 - Operator Menu Functions and
Descriptions............................................................. 26
Table 3 - Operator Menu Functions - Minimum and Maximum
Values ................................... 27
Table 4 - Technician Menu Functions and Descriptions
......................................................... 29
Table 5 - Technician Menu and Variable Limits
...................................................................... 30
Table 6 - Calibration Table
...................................................................................................... 36
Table 7 - Periodic Maintenance
Schedule............................................................................... 37
Table 8 - Alarm Descriptions and
Results............................................................................... 38
Table 9 - Troubleshooting: Alarm Descriptions and Solutions
................................................ 43
Table 10 - Troubleshooting: Problems and Suggested
Solutions........................................... 46
Table 11 - Additional features in Operator Menu (With Total Chlorine Monitoring)................
56
Table 12 - Additional Alarms (With Total Chlorine Monitoring)
............................................... 56
Table 13 - Alarms (With Total Chlorine
Monitoring) ................................................................ 57
Table 14 - Technician Menu (With Total Chlorine
Monitoring) ................................................ 58
Table 15 - Modbus Configuration
Options............................................................................... 65
Table 16 - Modbus CommunicationsOptions
......................................................................... 66
Table 17 - Relays and their controlled dosing
systems........................................................... 72

Copyright © Chemical Injection Technologies, Inc.
1 General Safety Precautions
This section presents important information intended to ensure safe and
effective use of this product.
Read the following carefully before handling the product. These warnings and
cautions must be followed carefully to avoid injury to yourself or damage to
equipment.
Warning: Only properly trained and licensed
electricians should attempt to wire or service the
electronic components of the analyzer/controller.
There is an Electrical Shock Hazard when
servicing this system.
Always verify that all electrical power source(s)
are off before opening the analyzer/controller
unit or attempting to service electronic
components or wiring.
Caution: Extreme caution should be used when
installing, operating, and maintaining the
WATERGUARD® Analyzer. Only properly
trained technicians are authorized to install and
maintain the analyzer/controller.
Attention! Seuls des électriciens qualifiés ayant
reçu la formation adéquate peuvent
entreprendre le branchement, l’entretien ou la
réparation des composants électroniques de
l’analyseur/du contrôleur.
Il existe un risque de choc électrique lors de
l’entretien de ce système.
Ayez soin de toujours vérifier que la ou les
source(s) d’alimentation électrique est ou sont
bien déconnectée(s) avant d’ouvrir l’unité ou
d’entreprendre toute opération de service
technique et tout branchement des composants
électroniques.
Attention! Il y a lieu d’agir avec une extrême
prudence lors de l’installation, de la mise en
œuvre et de la maintenance du contrôleur
WATERGUARD®. Seuls des techniciens dûment
formés à cet effet sont autorisés à effectuer
l’installation et la maintenance de l’analyseur/du
contrôleur.
Only properly trained and licensed operators
should attempt to make any changes to
chemical dosing levels.
Seuls des opérateurs qualifiés ayant reçu la
formation adéquate sont habilités à modifier les
dosages des produits chimiques utilisés.
Always follow local health and safety regulations
when performing any service on the
analyzer/controllerunit or when changing
chemical dosing settings.
Conformez-vous sans exception aux consignes
locales de santé et de sécurité lorsque vous
effectueztoute opération technique sur
l’analyseur/le contrôleur, ou lorsque vous
modifiez les paramètres de dosages chimiques.

Copyright © Chemical Injection Technologies, Inc.
Each relay connection is limited to 8 amps, to
prevent overheating. The relays mayshow a
higher rating but do not connect equipment
exceeding 8 amps.
Chaque connexion relais est limitée à 8 Amp.
afin d’éviter toute surchauffe. Même si les relais
affichent éventuellement une valeur supérieure,
ils ne se connecteront pas à un élément
dépassant 8 Amp.
All electrical connections should comply with
National Electrical Code (NEC) and all local
regulations.
Tous les branchements électriques doivent être
conformes au Code Electrique National (NEC –
National Electrical Code) ainsi qu’à toutes les
consignes locales.
Mixing reagents:
Caution: Use protective gear as recommended
in MSDS.
Caution: Do not use chemicals that reduce the
surface tension. When using hydrochloric acid,
observe all safetyregulations.
Mélanges réactifs:
Attention! Utilisez l’équipement de protection
préconisé dans la fiche de données de sécurité
(MSDS).
Attention! N’utilisez pas de produits chimiques
susceptibles de réduire la tension superficielle.
Lors de l’utilisation d’acide chlorhydrique,
appliquez scrupuleusement toutes les consignes
pertinentes.
Caution: WATERGUARD's control board unit
should not be opened except for initial
installation and troubleshooting, and should only
be opened by a trained and approved
technician.
Attention! Le tableau de commandes de
l’WATERGUARD ne doit en aucun cas être
ouvert si ce n’est lors de l’installation initiale et
en cas de dépannage –auquel cas son
ouverture ne doit être effectuée que par un
technicien ayant reçu la formation adéquate et
dûment habilité.

Copyright © Chemical Injection Technologies, Inc.
2. Preface
2.1 Intended Use
This manual is for qualified and trained service technicians who will install and service the
WATERGUARD HG-702Water Quality Analyzer. It provides instructions on how to install the
WATERGUARD system, how to integrate it with external chemical dosing systems and how to calibrate,
operate and maintain the system.
2.2 Overview of Chapters
This document is functionally divided into chapters according to the various steps involved in
installing and operating the WATERGUARD system.
Chapter 1: General Safety Precautions
This section presents important information intended to ensure safe and effective use of this
product.
Chapter 2: Preface
Intended use of the manual and safety issues
Chapter 3: Controller Overview
General description of how water quality is maintained and how WATERGUARD
automaticallymonitors and controls
Chapter 4: Installation
Instructs how to install WATERGUARD and how to integrate it with water quality systems
Chapter 5: First Time Set-up
Instructs how to configure, calibrate, and operate the WATERGUARDsystem immediately
after it is installed
Chapter 6: Routine Operation and Maintenance
Instructs how to respond to alarmsand troubleshooting issues
Chapter 7: Optional features
Describes some optional components that may be installed on the controller or added later
Chapter 8: Relays & Closed-Loop Control
Lists and describes WATERGUARD's operational components
Chapter 9: Setting Proportional Control
Describes how WATERGUARD implements proportional monitoring and control and instructs
how to configure it in various environments.
Chapter 10: Technical Specifications
Includes information about dimensions, electrical systems, relays, measurement of chlorine,
turbidity and pH, etc.

Copyright © Chemical Injection Technologies, Inc.
3. Overview
The WATERGUARD HG-702 Water Quality Analyzer & Controller continuouslymonitors and
automaticallycontrols chemical levels in process water and potable water applications.
WATERGUARD performs automated analysis of free and/or total chlorine, turbidity, pH, ORP (redox),
temperature, conductivity and flow rate, administering chemicals as required, according to the results
of these tests.
3.1 The WATERGUARD Solution
Various methods have been developed over the years to monitor the concentration and balance of
chemicals used in water treatment. WATERGUARD measures free and/or total chlorine levels with a
digital photometer, which has many advantages over other types of sensors. Digital photometer
testing is completely objective. It is not dependent on lighting conditions or the operator’s eyesight,
and is far more accurate. It does not require frequent calibration and is compatible with all types of
disinfectant systems. WATERGUARD performs colorimetric testing in a closed reading cell. It is the
only system that automaticallyand accuratelymeasures free chlorine using small amounts of reagent.
WATERGUARD provides a turbidity measurement in NTU (Nephelometric Turbidity Units). This
provides a consistently objective evaluation of the overall water quality. High turbidity may be a result
of poor filtration or unbalanced water chemistry. The turbidity value will provide an indication that one
of these conditions exists and that action is required to improve the water quality. In many cases the
turbidity can be reduced by adding a flocculent to the filter which will improve filtration. A turbidityrelay
is included in the controller and will operate when turbidity is above the set point. This may be
connected to a flocculent dosing pump or other equipment used to reduce turbidity, providing an
automatic response and maintaining clear water without manual intervention. Likewise, if the turbidity
ever exceeds a pre-set limit, the controller will set off an alarm indicating that attention is required.
Once installed and calibrated, WATERGUARD is fully automatic. It will monitor and can control dosing
systems directly, releasing the proper quantity of chemicals based on frequent automatic
measurements.WATERGUARD is simple to use. Its straight-forward control panel and parameters
menu make chemical balance control an easy task. All basic information can be viewed at a glance,
and changing settings is as simple as scrolling through the menu and adjusting the current settings.
3.2 Measurements and Features
The WATERGUARDHG-702 can be configured to measure any combination of the following water
qualityparameters:
•Free chlorine
•Total chlorine
•Both free chlorine and total chlorine
•Turbidity
•Temperature

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•Conductivity
•pH
•ORP (redox)
•Flow rate
Optional communication protocol
•Modbus Protocol
•Blue I Protocol
Several communication options are also available:
•Internal 4 to 20 mA outputs (up to 6 channels)
•Wireless modem
•Ethernet
•Modbus
3.2.1 Wireless Management Package*
An advanced and unique WATERGUARD option is the wireless modem which provides web- based
monitoring of up to 5 analyzers. This cellular communicator collects WATERGUARD’s alarms and
readings and transmits them to a web-based application server. The information is easily accessed
via the Internet or mobile device.
*The wireless modem is an optional module.
Note: Not all cellular companies support this wireless modem. Please contact Chemical Injection
Technologies or your supplier for details. See the supplemental manual for instructions on
installing and using the modem.
3.3 System Components
WATERGUARD has two primaryunits: the analyzing unit and the control unit.
The analyzing unit performs the actual measurements.It contains the following components:
Colorimetric Assembly Unit –A closed cell that measures free and/or total chlorine levels using
DPD reagents and a digital photometer, and measures turbidity levels using a nephelometer.
Acrylic Sampling Cell –Contains the sensors, including the pH, Redox (ORP) and
temperature sensors.
Reagent Bottles –Contains the reagents used by the colorimeter to measure chlorine levels in the
water. Each bottle is equipped with a non-return valve to prevent water flowing back into the bottles.
Reagent Pumps and Solenoid Valve –Accuratelycontrols the flow of water and reagents into
the colorimeter,making every measurement as accurate as possible.
The control unit includes all electronics, the user interface and the software that controls the
measurements performed in the analyzing unit. It includes the following components:

Copyright © Chemical Injection Technologies, Inc.
I/O Module (Input/Output)–Providing power to the analyzer and containing the dry-contact relays for
direct control of external dosing systems.
Control Panel –Calculates the measurement results and determines the required chemical dosing to
maintain an appropriate chemical balance in closed-loop systems. The control panel also provides data
to external communication devices such as the 4-20 mA outputs, wireless modem or Modbus
communication.
Keyboard Panel –Mounted on the cover of the control module, the keyboard panel functions as
WATERGUARD’s user interface. This control panel displays current measurements and indicates
alarms. All settings and adjustments are performed through the control panel.
Colorimeter Card –Controls the colorimeter and associated components, such as the reagent
pumps and solenoid valve. It accuratelycalculates the chlorine and turbidity levels.
pH, Redox, Temp Module* –Receives signals from the pH, redox, and temperature probes.
Internal 4-20 Input Module* –Contains connections for turbidity and conductivitymeter and a 4-20
flow meter.
Internal 4-20 Output Module* –Provides up to six 4-20 mA outputs for any measured variable.
Improved Disk Filter –Provides optimal water filtering and easier cleaning.
Sensors Cables –Routed behind the solenoids and are securelyfastened using a special loop.
*Optional module
Figure 1: WATERGUARD HG-702 Components

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1.
Dosing pumps
12. Acrylic flow cell inlet
2.
DPD1 indicator bottle holder
13. Proximityflow switch
3.
DPD1 buffer bottle holder
14. Solenoid valve
4.
DPD3 indicator bottle holder
15. Colorimeter
5.
Analyzer water inlet ON/OFF ball valve
16. Colorimeter cap / reagent injector
6.
Reagent floaters
17. I/O card
7.
Pre-filter (washable disc filter)
18. Colorimeter card
8.
Pressure regulator
19. Electrodes card (Temp, pH, ORP)
9.
Analyzer gravity drain
20. Control panel card
10.
Acrylic flow cell drain (water outlet)
21. Ethernet card
11.
Acrylic flow cell sampling valve
22. NTU / Conductivitycard

Copyright © Chemical Injection Technologies, Inc.
4 Installation
4.1 Selecting a Location
WATERGUARD installation begins with manual installation and connecting the unit to the
system that it controls, as described in this chapter. Once physically installed, sensors and
reagents must be inserted into the unit and the control system must be started and
calibrated, as described in Chapter 5, First Time Operation and Calibration.
WATERGUARD should operate for several days in order to be properly tuned to its specific
environment. Additional periodic modification, calibration, and maintenance are required
after WATERGUARD has been operating on a regular basis. This is described in Chapter
6, Routine Operation and Maintenance.
Convenient access –WATERGUARD should be installed where it can easily be viewed
and operated.
Dry area –WATERGUARD is operated by electricity and includes electronic circuitry that
is susceptible to short-circuitingand/or corrosion when exposed to water or high ambient
moisture levels; therefore, the unit should be installed in a dry area.
Away from chemicals –Many water treatment chemicals can be corrosive to
WATERGUARD’s electronic circuitry. It is highly recommended that the unit is not
installed adjacent to a storage area for chemicals or the dosing systems themselves.
Minimal distance from supply pipe –The water sampling line that is connected to the
main pipe that feeds the WATERGUARD should be as short as possible. A long sample line
creates unnecessarydelay between supply, measurement, analysis and chemical dosing.
Drainage –WATERGUARD’slocation should allow the colorimeter drain outlet
sufficient grade for gravity flow, without creating an obstacle (e.g., no pipe across
walkway). The sampling cell may be pressurized to allow for return to the system under
pressure.
Freezing and changing temperatures –The analyzer should be installed in a location that
is not susceptible to freezing temperatures. This is because reagents can freeze, preventing
accurate readings (even when thawed); and parts may be damaged due to expansion when
ice forms. Avoid installing in a location that is exposed to extreme temperature fluctuations;
sudden water temperature changes can affect readings.
4.2 Site Requirements and Installation
The WATERGUARD assembly is wall-mounted. It should be located on a wall where
operators and service technicians can easily access it for normal operation and
maintenance. It is also advisable to install it where the operators can easily view the
readings and alarms. The complete unit with all connections weighs 24.3 lbs (11 kg), so it
must be mounted securely on a stable wall.
The WATERGUARD unit measures as follows (W x H x D):
Controller: 26.4” x13”x 5.1”(67 cm x 33 cm x 13 cm).
Mounting board: 31.5” x21.7” x 0.2” (80 cm x 55 cm x 0.5 cm).
The base of the controller should be mounted at least 24”(61 cm) above the floor
(preferably at eye level).
Note: During disassembly, be sure to retain all hardware for use during
reassembly. Upgrade and replacement kits may re-use some original components.

Copyright © Chemical Injection Technologies, Inc.
4.2.1 Mechanical Installation Requirements
The WATERGUARD unit and its mounting panel are not shipped with mounting screws or
anchors. The installer must provide screws and anchors that can hold the weight of the
WATERGUARD unit, mounting panel, intake filter and electrical outlets and junction boxes.
The screws and anchors must be compatible with the wall where it will be installed.
4.2.2 Mechanical Installation
The following procedure instructs how to install the WATERGUARD unit.
1. WATERGUARD is shipped pre-mounted on a mounting panel, along with a water filter.
2. Attach the water filter before mounting the panel on the wall.
The mounting panel includes four screw holes, one in each corner.
3. Determine the location on the wall for each hole on the WATERGUARD unit or on the
mounting panel; drill the holes and insert screw anchors.
Figure 2: Mounting WATERGUARD on the
Wall
4. Place a 5/16”(8 mm) screw in each hole and two metal washers (supplied with the
unit) on each screw behind the mounting panel, so that they come between the
mounting panel and the wall. Screw the panel to the wall.
Note: The WG-702 must be leveled in order to achieve proper operation.

Copyright © Chemical Injection Technologies, Inc.
4.3 Plumbing Requirements and Installation
4.3.1 Water Supply
WATERGUARD requires a pressurized water supply to the sampling cell. An isolating valve
must be installed between the main line and the pipe (or tube) to the WATERGUARD filter.
The distance from the main pipe to the WATERGUARD should be as short as possible, in
order to minimize delay time between the water being sampled and WATERGUARD’s
measurement.
Minimum inlet pressure should be 7.0 psi and should not exceed 15 psi
using a pressure reducing valve attached to the pre-filter outlet (Figure 3).
Figure 3: Pressure Reducing Valve
4.3.2 Colorimeter Drainage
A gravity drainage connection is required for the water draining out from the colorimeter. A
pressurized, vacuum, or gravity connection is required from the outlet of the sampling cell to
return water from the sampling cell to the water supply. The length of the colorimeter drain
line should be as short as possible and must have a constant downward slope to prevent
backflow.
The sampling cell may be pressurized up to 14.5 psi (1 bar); if the sampling cell drain is
connected to vacuum, the inlet pressure must be at least 7 psi (0.5 bar) greater than the drain
vacuum. A drain cap is located on the colorimeter outlet to prevent backflow into the
colorimeter if the drain line is blocked. A ½” NPT fitting is supplied for the colorimeter drain
connection and a ¼” FNPT fitting is supplied for the sampling cell drain connection.
Note
The WATERGUARDcolorimeter drains water at zero (0) pressure. The drainage pipe should
be as straight as possible. It should have a constant downward slope and should not have
any bends where water flow can be restricted. If the colorimeter drains to a bucket or basin,
the end of the drainage pipe should terminate above the bucket or basin rim.

Copyright © Chemical Injection Technologies, Inc.
Inductive
proximity
sensor
Colorimeter
outlet
Sample
valve
Flow
cell

Copyright © Chemical Injection Technologies, Inc.
Figure 4: Sampling Cell and Colorimeter Components
4.4 Electrical Requirements and Installation
WATERGUARD requires a 100-115 or 200-230 VAC, 50/60 Hz electrical power source on a
separate 16A circuit in the facility’s electrical board. The main WATERGUARD power supply
should be connected to a uninterrupted power supply (UPS), so that the unit remains powered
constantly. The active relays should be connected to a dependent power supply(interlocked
power supply).
4.4.1 Connecting the Main Electrical Power
The main power supply may be connected to either 100-115 or 200-230 VAC 50/60Hz.
1. Verify that the power switch or circuit breaker to the non-dependent power source is off.
2. Connect the line (live) wire to the I/O board connector marked Line.
3. Connect the neutral wire to the I/O board connector marked Neutral.
4. Connect the earth wire to the I/O board connector marked Ground.
5. Continue with the other electrical connections.
6. Turn on electrical power only after all electrical connections have been completed.
For information on wiring and using the relays as dry contact or for control, see section
7.8 below: Chlorine Shock Mode.
4.4.2 Input Switches
Flow input switch terminal blocks on the I/O module allow for three input switches to be
connected to the system as additional layers of security against accidental chemical additions
when there is no flow. If a connection is expected but not detected at each input, the
analyzer/controller will indicate an alarm and will close all relays (and open the alarm relay).
Therefore, if a safety switch (flow, level, etc.) will not be installed, a fixed connection (jumper
wire) is required to allow the controller to operate.
Two flow switches (included) and one flow meter (not included) may be connected:
•ProximityFlow Switch: Flow switch connected to the analyzer’s sampling cell.
Connect the Black wire to “IN”, Blue wire to “GND”, and Brown wire to “VCC”.
•External Flow Switch: Connection for an external 2-wire flow switch.
o If an external switch is not connected, the Internal Flow Switch must be
installed for the analyzer to operate properly.
•Flow Meter: Connectionfor 2- or 3-wire flow meter. The analyzer will not display flow
meter readings on the LCD display until “flow sensor” is turned ON in the Technician
Menu (See section 5.3.5); Therefore, no jumper is required if a meter is not installed.
Caution
Electrical connections depicted in this section are ONLY recommendations.All electrical
connections should comply with National Electrical Code (NEC) and all local regulations.

Copyright © Chemical Injection Technologies, Inc.
5 First Time Operation and Calibration
5.1 Installing Additional Sensors
Install all additional sensors and meters and connect to the main system of the
WATERGUARD HG-702, following the instructions for each sensor as follows.
5.1.1 pH, ORP (Redox) and Temperature Measurements
5.1.1.1 Installation
If the WATERGUARD system was ordered with these components some steps in this process will
have been completed in the factory and may be skipped.
Required Components
•pH, ORP, Temp Module (electronics card)
•150 mm flat cable
•pH probe
•ORP (Redox) probe
•Temperature probe
•Connectors for temperature probe
Note
The system may be operated with only pH or only ORP but must always have the
temperature probe as this provides additional grounding to ensure reliable pH and ORP
measurements.
The following procedure describes how to install the ORP (Redox) and pH sensors in the
WATERGUARD unit. The installation of all the sensors in the sampling cell is similar, except for
the connecting wires.
Caution
Make sure the pH and ORP (Redox) sensors have plastic or rubber plugs covering their ends. Use
another sensor if the plug of any sensor is missing or has fallen off.
Make sure to connect the appropriate wire to the appropriate sensors. Labels are located on the
wires near the probe connection and on the connection on the pH, Redox, Temp Module.
1) Turn off all power and water supplies to the analyzer.
Installthe pH, ORP, Tempmodule(electronicscard) in thecontrolmoduleon thetopleft(above the
colorimeter module, if present) using the 4 supplied screws.
Connect the flat cable to the pH, ORP and Temp module to an open connector on the I/O
module.
Install the temperature probe:
a. Thread the 3/8”compression connector into the back of the sampling cell. b.
Place the probe into the connector and secure in place.
c. Route the temperature probe wires into the electronics box and connect to the pH,
ORP and Temp module following the color codes listed on the module.
Install the pH and/or ORP probes:

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a. Remove the sensor from its packing box.
b. Removethe plastic cover or plug from the end of thesensorand drain thesolutionfrom the
tube. Keep the plastic cover in a safe place for winterizing or storage of probes.
c. Hold the sensor by its metal connector, with the glass tube pointing down.
d. Insert the sensor into the top of the transparent sampling cell and thread in securely.
DO NOT OVERTIGHTEN.
e. Route the pH and/or ORP cables to the electronics box and connect to the pH, ORP
and Temp module.
f. Connect each cable to the appropriate sensor.
Repeat step 5 for additional sensors.
If only one sensor is installed:
a. Install a jumper between the inputs for the missing probe.
b. In the menu, set the low and high alarm limits at the minimum and maximum values
respectivelyto prevent a false alarm for a measurement that is not connected.
Switch the WATERGUARD ON and verifythat pH and or ORP readings appear on the display.
In some analyzers, this may need to be turned on in the Technician Menu.
Observe the pH and ORP (Redox) levels and wait several minutes until both readings
stabilize. If either one or both indicators do not display a proper reading or are not stable,
confirm proper installation and then see the Troubleshootingsection (6.6).