ATI Technologies PQ45H User manual

O & M Manual
Model PQ45H
Portable Dissolved Ozone
Measurement System
Home Office European Office
Analytical Technology, Inc. ATI (UK) Limited
6 Iron Bridge Drive Unit 1 & 2 Gatehead Business Park
Collegeville, PA 19426 Delph New Road, Delph
Phone: [phone] Saddleworth OL3 5DE
610-917-0991 Phone: [phone]
Fax: [phone] Fax: + 44 (0)1457-874-468
Email: [email protected] Email: [email protected]

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Table of Contents
TABLE OF FIGURES ............................................3
PART 1 - INTRODUCTION..................................4
1.1 General.......................................................4
1.2 Standard System ........................................4
1.3 Features......................................................5
1.4 Q45H/64 System Specifications ................6
1.5 Q45H Performance Specifications.............7
PART 2 –SYSTEM COMPONENTS ...................8
2.1 General.......................................................8
PART 3 –SENSOR PREPARATION .................12
3.1 Dissolved Ozone Sensor Preparation.......12
3.2 Sensor Polarizer (Keeper)........................13
3.3 Optional pH Sensor..................................14
PART 4 –ELECTRICAL ASSEMBLY..............15
4.1 General.....................................................15
4.2 Sensor Connections .................................15
4.3 Battery / Power Circuit Board .................16
4.4 External Power / Output Connections......17
PART 5 –OPERATION .......................................19
5.1 User Interface...........................................19
5.2 Battery Power Circuit Board....................20
5.3 Voltage Outputs.......................................20
5.4 External Power.........................................21
5.5 Data logger Module .................................21
5.6 Maintaining Sensor Stability ...................21
5.7 User Interface...........................................22
5.71 Keys.....................................................22
5.72 Display.................................................23
5.8 Software...................................................24
5.81 Software Navigation...........................24
5.82 Measure Menu [MEASURE]...............27
5.83 Calibration Menu [CAL] ........................28
5.84 Configuration Menu [CONFIG] .........28
5.85 Control Menu [CONTROL] ...............32
5.86 Diagnostics Menu [DIAG].....................32
PART 6 –CALIBRATION...................................35
6.1 Ozone Calibration....................................35
6.11 Dissolved Ozone Zero Cal...................35
6.12 Ozone Span Cal ...................................36
6.2 Temperature Calibration..........................37
6.3 pH Calibration .........................................37
6.31 Two-Point pH Cal................................38
6.32 One-Point pH Cal ................................39
PART 7 –DATA LOGGER (OPTION) ..............40
PART 8 –SYSTEM MAINTENANCE ...............42
8.1 General.....................................................42
8.2 Analyzer Battery Replacement ................42
8.3 Sensor Maintenance.................................42
8.31 Sensor Acid Cleaning ..........................43
8.4 Flow Cell Maintenance............................43
PART 9 –TROUBLESHOOTING......................44
9.1 General.....................................................44
9.2 External Sources of Problems..................44
9.3 Analyzer Tests.........................................44
9.4 Display Messages ....................................44
9.5 Sensor Tests.............................................47
SPARE PARTS......................................................48

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Table of Figures
FIGURE 1-PQ45 PORTABLE MONITOR SYSTEM.......................................................................................................................5
FIGURE 2-FRONT VIEW OF HINGED PANEL.............................................................................................................................8
FIGURE 3-SENSOR AND FLOW COMPONENTS..........................................................................................................................9
FIGURE 4-DISSOLVED OZONE SENSOR ASSEMBLY ..................................................................................................................12
FIGURE 5-OPTIONAL PHSENSOR........................................................................................................................................14
FIGURE 6-SENSOR CONNECTIONS,PQ45 DISSOLVED OZONE SYSTEM .......................................................................................15
FIGURE 7-BATTERY CIRCUIT BOARD W/C-CELL BATTERIES ......................................................................................................16
FIGURE 8-BATTERY CIRCUIT BOARD W/EXTERNAL POWER TERMINALS ......................................................................................17
FIGURE 9-EXTERNAL CONNECTION CABLE COLOR CODE..........................................................................................................17
FIGURE 10 -BATTERY BOARD CONNECTION...........................................................................................................................20
FIGURE 11 -USER INTERFACE .............................................................................................................................................22
FIGURE 12 -SOFTWARE MAP .............................................................................................................................................26
FIGURE 14 -AUTOMATIC PHBUFFER TABLES.........................................................................................................................31
FIGURE 15 -Q45H DISPLAY MESSAGES ...............................................................................................................................45
FIGURE 16 -Q45H DISPLAY MESSAGES (CONTINUED).............................................................................................................46
FIGURE 17 -PT100 RTD TABLE..........................................................................................................................................47

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Part 1 - Introduction
1.1 General
The Model PQ45-65 Portable Dissolved Ozone Monitor is designed for short-term measurement
and data logging of dissolved ozone in water systems. It may also be used for permanent
monitoring in locations where solar power systems are available to provide continuous power.
Each system is a self-contained package that includes a battery-powered analyzer, sensor,
flowcell assembly, and sample flow controls. For systems supplied with optional pH
measurement, two sensors and flowcells are installed. Sample and drain connections are
provided on the outside of the case, and connectors and tubing to adapt to water samples are
supplied. Sample lines with pressures up to 75 PSI (5 Bar) may be connected without pressure
reduction. For samples subject to higher pressures, a pressure-reducing valve should be used to
control sample pressure to less than 75 PSI (5 Bar).
Both the fittings installed in the case and the fittings supplied for sample tubing connection
externally are equipped with shut-off valves. When both fittings are plugged in, sample will flow.
When either the inlet or outlet fittings are disconnected, sample flow will stop. Sample flow rate is
controlled internally by a special orifice flow control device that provides a fixed 400 cc/min. flow
at sample inlet pressures between 5 and 75 PSI (0.3-5.0 Bar). An in-line y-strainer is installed to
trap particles larger than 65 micron.
Most system components are mounted on a hinged panel inside the case. The electronic unit is
mounted on the front of the panel. If the optional data logger was ordered, this is also mounted
on the front. Opening up the internal panel allows access to the sensor, flowcell, and flow control
assembly. Maintenance items, connectors, and extra tubing are stored in the space behind the
panel.
1.2 Standard System
Standard PQ45 systems include a battery-powered electronic unit, a dissolved ozone sensor and
flowcell, flow control components, sample and drain tubing, and various accessories. The
standard batteries consist of two standard alkaline C-cell batteries located inside the electronic
assembly.
Optional items may be installed if specified when ordered. The two main options are a pH sensor
and flowcell assembly and a removable battery-powered data logger with software

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Figure 1 - PQ45 Portable Monitor System
1.3 Features
Standard main module is designed to be a fully isolated, battery-powered instrument. An optional
arrangement provides for external power from a 10-16 VDC supply.
High accuracy, high sensitivity system, measures from 0.1 ppb to 20.0 ppm through 4 internal
automatic ranges. User ranges of 200.0 ppb, 2.000 ppm, or 20.00 ppm.
Two 10-bit, isolated, 0-2.5 VDC analog outputs are configured to track dissolved ozone and
temperature. The second output may be programmed for pH or ORP if the optional pH sensor
and flowcell is installed. Both analog outputs can be individually programmed to specific ranges.
Optional data logger (removable module) allows the user to gather up to 32000 total data points.
Large, high contrast, custom Super-Twist display with LED backlight provides excellent
readability even in low light conditions. A secondary line of display utilizes 5x7 dot matrix
characters for clear message display. Two measured parameters may be on the display
simultaneously.
Diagnostic messages provide a clear description of any problem with no confusing error codes to
look up. Messages are also included for diagnosing calibration problems.
Quick and easy one-point calibration method and sensor zero-cal. To provide high accuracy, all

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calibration methods include stability monitors that check temperature and main parameter stability
before accepting data.
High accuracy three-wire Pt100 temperature input. Temperature element can be user calibrated.
Security lock feature to prevent unauthorized tampering with transmitter settings. All settings can
be viewed while locked, but they cannot be changed.
Low battery indicator on the display alerts operators that the C-cell batteries are nearing end of
life. Normal operational life for two C-cell batteries is about 30 days of continuous operation.
1.4 Q45H/64 System Specifications
Displayed Parameters Main input, 0.1 ppb (0.0001 ppm) to 20.00 ppm
Sensor temperature, -10.0 to 55.0 °C (23 to 131 ºF)
Sensor Current, 0.0–999.9 nA, 0.000 to 99.99 uA
Output Voltage, 0-2.5 VDC
Sensor slope/offset
Model number and software version
Optional pH Input value. 0.00 to 14.00 pH
Main Parameter Ranges Manual selection of one of the following ranges,
0.000 to 200.0 ppb
0.0 to 2.000 ppm
0.00 to 20.00 ppm
Display Large, high-contrast, Super-Twist with backlight
4-digit main display with sign, 0.75" (19.1 mm) seven-segment
characters
12-digit secondary display, 0.3" (7.6 mm) 5x7 dot matrix
characters
Keypad 4-key membrane type with tactile feedback, polycarbonate with
UV coating
Weight 17 lbs. (7.3 Kg.)
Ambient Temperature Analyzer Service, 0 to 60 °C (-4 to 140 ºF)
Sensor Service, 0 to 55°C (32 to 131 °F)
Storage, 0 to 70 °C (32 to 158 ºF)
Ambient Humidity 0 to 95%, non-condensing.
EMI/RFI Influence Designed to EN 61326-1
Output Isolation 600 V galvanic isolation
Filter Adjustable 0-9.9 minutes additional damping to 90% step input
Temperature Input Pt100 RTD with automatic compensation
Sensor 2-electrode polarographic membrane sensor for direct
measurement of dissolved ozone.

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Sensor Materials Noryl and stainless steel
Sensor Cable 1ft. (.3 meter) cable with 6-pin plug.
Optional pH Input Combination pH sensor with 18” (46 cm) cable for direct
connection to electronics.
Flow Cell Sealed acrylic flowcell factory assembled with polyurethane
sample and drain tubing. Second acrylic flowcell supplied if
optional pH sensor is installed.
Instrument Power Two alkaline C-cell batteries standard.
External 5-17 VDC (10 mA) supply optional.
Battery Life Approximately 30 days of continuous operation with two high
quality alkaline C-Cell batteries. .
Outputs Two 0-2.5 VDC isolated outputs are provided for connection to
data recorders, etc.
Optional Data logger Removable data module holds total of 32000 points from
two user configured channels, time of logging is user
configurable.
Software Data logger software supplied when optional data logger is
ordered. Standard software package is PC compatible, but MAC
version is available.
1.5 Q45H Performance Specifications
Accuracy 0.5% of selected range or 0.01 PPM
Repeatability 0.3% of selected range or 0.01 PPM
Sensitivity 0.05% of selected range
Non-linearity 0.1% of selected range
Warm-up Time 3 seconds to rated performance (electronics only)
Supply Voltage Effects ± 0.05% span
Instrument Response Time 60 seconds to 90% of step input at lowest damping

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Part 2 – System Components
2.1 General
The PQ45 Portable Dissolved O3Monitoring System comes complete in a rugged molded case,
and is designed to be operated by simply setting the case in the desired location, connecting
sample and drain tubes, and turning on the power. However, when received, the sensors are not
yet ready for use, and the user must first prepare the dissolved ozone sensor and pH sensor if
supplied. Once the system has been readied for use, it can be turned on and off, and moved to
various locations without requiring further service.
2.2 Front Panel Components
The PQ45 contains an internal hinged panel. Release the two main case latches and you will see
the electronic monitor on the front of the panel with a graphic of the software map located below.
The graphic is meant to be a reference for navigating the software in the analyzer. If the optional
data logger was ordered, this component will be located just below the monitor, and will have two
connectors plugged into the side.
Figure 2 - Front View of Hinged Panel

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2.3 Internal Flow System
The “Wet” section of the analyzer is located on the back of the internal hinged panel. The panel
is held in place by two captive screws on the right side. Loosen these screws to get access to the
sensors and sample flow components. Figure 3 identifies the items located on the back of the
panel. Note that the drawing shows the optional pH sensor and flowcell, but these items are only
supplied when specified on the order.
Figure 3 - Sensor and Flow Components
The flow system inside the case consists of quick-disconnect sample and drain fittings,
polyurethane tubing, flow control assembly, and either one or two flowcells with sensors. This
system is completely assembled and is designed for connection to water sources with pressure
between 5 and 75 PSI. Note that the drain tube MUST discharge to an unpressurized drain. You
may not connect the drain to a pressurized line or the system will not function properly.
Most tubing connections are made using what are called “instant tube fittings”. These fitting are
designed to allow tubing to be readily removed in case service is needed on a particular
component. This is normally only needed to remove the flow control assembly to clean the y-
strainer.
The instant tube fittings have a circular collar at the end of the fitting. This collar must be pushed
toward the main body of the fitting while pulling the tubing in the opposite direction. When
reinserting the tubing, simply press the tubing into the fitting and you will feel it slide into place.

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2.4 Flow Control System
The sample flow to the sensors in this instrument is controlled by a special orifice control device
that controls sample flow to approximately 400 cc/min. regardless of variations in inlet pressure.
The flow control device is protected by a y-strainer. This strainer is designed to remove any large
particles that might adversely affect the performance of the flow control.
The y-strainer should be inspected periodically and cleaned of accumulated solids. To do so, it is
easiest to remove the entire flow control system by disconnecting the inlet and outlet tubes from
the top and bottom of the assembly, and then removing it from the mounting clip. Once removed,
use a crescent wrench to unscrew the screen holder. Remove the screen and rinse as needed to
remove any accumulated solids.
2.5 Sensor Polarizer
Each PQ45H dissolved ozone system is supplied with a “sensor polarizer” designed to facilitate
stabilization of the O3sensor, and to keep the sensor in a state where it is ready for use
immediately, even if the analyzer is turned off.
The polarizer is a battery-operated device that provides a bias voltage on the sensor electrodes
similar to that provided by the analyzer. The battery is sealed inside the device and should last 3-
5 years.
The polarizer will plug directly into the connector on the back end of the ozone sensor. To
maintain sensor stability when the main electronic unit is off, disconnect the sensor cable and
plug the polarizer into the back of the sensor. The unit can be stored in this way so that it is
ready to operate immediately.
2.6 Water Sample Connections
On the hinged side of the case are two quick-disconnect fittings marked INLET and OUTLET.
This is where you will connect your water sample. These connectors contain valves that
automatically close when the mating connector is removed. Mating connectors also contain
valves so that sample lines can be disconnected without closing the main tap valve.
A 20-foot (6 m.) length of 0.25” O.D. x 0.17” I.D. polyurethane tubing is supplied for connection to
water lines. In addition, tube fittings that mate with either 1/8” NPT or ¼” NPT sample lines are
supplied for convenience.

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2.7 Spare Parts
Behind the internal panel in the area of the flowcells and sensors is a molded foam area that
holds spare parts that might be needed in the field. The following items are normally supplied.
Qty. 1 Pack of 10 spare sensor membranes
Qty. 1 120 cc. Bottle of sensor electrolyte
Qty. 1 Misc. screw and 0-ring kit for sensors.
Qty. 1 Sensor polarizer
Qty. 1 Data Logger Software (if purchased with system)
Qty. 2 Quick-disconnect fittings for sample & drain connection
Qty. 4 Water system adapter fittings –two each of 1/8” NPT & ¼” NPT
20 feet ¼” O.D. x 0.17” I.D. sample / drain tubing
Any other accessories, spare sensors, membranes, polarizer, or adapter fittings that were
ordered with the system will be stored there if space allows.
Attached inside the front cover is a plastic pouch containing the O&M manual for the instrument.

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Part 3 – Sensor Preparation
3.1 Dissolved Ozone Sensor Preparation
The O3sensor supplied with the PQ45H is shipped dry. It will not operate until it is prepared by
adding electrolyte and a membrane. Preparation of the sensor for operation must be done
carefully. The procedure should be done by a qualified technician, and it should only be done
when the system is ready for operation. Until then, it is best to leave the sensor in the condition in
which it is received.
Figure 4 - Dissolved Ozone Sensor Assembly
Follow the procedure below to prepare the dissolved ozone sensor for operation:
1. Unscrew the electrolyte chamber from the assembled sensor and also remove the fill screw
(vent screw) from the side of the sensor body.
2. Remove the front nut from the bottom of the chamber and discard the protective membrane.
O-rings are contained in grooves on both the bottom and top of the chamber. Be sure that
these o-rings remain in place.
3. From the package of membranes supplied with the sensor, place a new membrane into the
front nut. The membrane is white in color and is separated from other membranes by a
light blue paper spacer.
4. Screw the front nut on to the chamber until you feel the o-ring compress. Hand tight
compression is all that is needed. Do not use tools to tighten. The membrane should be flat
across the bottom of the chamber without wrinkles.

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5. Fill the chamber with electrolyte until the level reaches the bottom of the internal threads.
6. Slowly screw the chamber onto the sensor body. A small amount of electrolyte will run out of
the hole from which the vent screw was removed. Place a paper towel around the sensor to
absorb the electrolyte overflow. The electrolyte is harmless and will not irritate skin. Tighten
the chamber until the o-ring at the top of the chamber is compressed. Once again, do not
use tools to tighten.
7. Shake excess electrolyte from the vent hole on the side of the sensor and replace the fill
screw.
The sensor is now ready for operation. The membrane should be stretched tightly across the tip
of the sensor. Screw the sensor into the flowcell on the back of the hinged panel. Note that you
do not need to screw the sensor in completely. The seal is made using an o-ring on the body.
Simply screw it in until you can easily plug in the connector for the sensor cable. The flowcell
should contain enough water to keep the membrane area wet for proper storage. Be sure to
have the drain fitting plugged into the outside port when inserting and removing sensors.
When fittings are not connected, trying to remove or insert a sensor will be extremely
difficult.
CAUTION: When handling the assembled sensor, do not set the sensor
on its tip or damage to the membrane will result. Severe
impacts on the tip of the sensor from dropping or other
misuse may cause permanent damage to the sensor.
3.2 Sensor Polarizer (Keeper)
Each PQ45H dissolved ozone system is supplied with a “sensor polarizer” designed to facilitate
stabilization of the dissolved ozone sensor, and to keep the sensor in a state where it is ready for
use immediately, even if the analyzer is turned off. It plugs onto the back of the sensor and
maintains sensor stability when the monitor is not in use. By using the keeper, you can reconnect
the sensor and begin measuring within 5 or 10 minutes, even when your monitor has been shut
off for an extended period.
Dissolved ozone sensors have a relatively long stabilization time when they have not been used
for an extended period of time. New sensors require the longest time, while sensors that have
been used for a long time stabilize more quickly.
After preparing the sensor according to 3.1 Dissolved Ozone Sensor Preparation and
installing the sensor in the flowcell with a small amount of water, simply plug the keeper into the
back of the sensor where the analyzer cable is normally connected. For new sensors, your
system will be ready for use within 4-8 hours. For older sensors where the membrane and
electrolyte were change, 2 hours is generally sufficient.
The sensor keeper uses a sealed battery system and is a disposable device. It should last for 3
years or more in normal service. Replacement keepers are listed on the spare parts list at the
end of this manual. Be sure to follow all applicable environmental regulations when
disposing of this device.

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3.3 Optional pH Sensor
The optional pH sensor available for use with the PQ45H system is a combination pH/reference
electrode with a stainless steel solution ground. It is directly connected to the electronics
assembly and is held in place in the flowcell with a twist-lock arrangement on the cap.
During final testing of PQ45 systems, tap water is run through the flow system. Some of this
water is trapped inside the flowcells to insure the pH sensor will remain wet during transport.
Sensors for pH should always be stored wet. A rubber boot is supplied in the spare parts
container should you wish to store the pH sensor outside the flowcell during extended periods
when the analyzer will not be used. Pour a small amount of pH 4 buffer into the boot and slide it
onto the end of the sensor. Some Teflon tape stretched around the top of the boot will help keep
the solution contained.
To remove the pH sensor from the flowcell, turn the sensor until the twist-lock pins line up with
the insertion slots and CAREFULLY pull the sensor upward. Be very careful removing the
sensor as it is easily broken.
Figure 5 - Optional pH Sensor

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Part 4 – Electrical Assembly
4.1 General
PQ45 Portable Analyzers are factory wired and are ready to operate as received. If units were
supplied with the optional data logger, voltage output cables that plug into the logger will be
supplied. If no logger was purchased with the unit, these cables will not be installed. Units
supplied with the external power and output connector will be provided with a mating cable
assembly.
4.2 Sensor Connections
Figure 6 below provides information on the proper connection of sensor cables. This information
is for reference only as the connections are made at the factory. Note that jumpers will be
installed at the factory between terminals 3 and 5, and terminals 6 and 9 when no pH sensor
input is connected to reduce the potential for noise pickup. Remove the jumpers if a pH sensor
is added later.
Figure 6 - Sensor Connections, PQ45 Dissolved Ozone System

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4.3 Battery / Power Circuit Board
PQ45H monitors are normally powered by internal C-cell alkaline batteries or by an external
power connection. Figure 7 shows this board assembly with batteries installed. Figure 8 shows
the same board with terminals installed for external power connection.
The battery circuit board contains 3 switch assemblies as shown in the drawings.
The first (S1) is an On/Off slide switch. This switch must be in the ON position for operation.
Turn it to OFF if you do not intend to operate the monitor in the next week or two.
The second switch assembly (S2) contains two switches, the one on the left marked LOCK and
the one on the right marked MODE. The function of these two slide switches are as follow:
LOCK This switch is used to define how the monitor will turn on and off. This switch is
normally in the OFF position. With the lock switch off, the monitor will be turned
on manually using the MENU key on the front of the monitor. With the lock
switch in the ON position, the monitor will always be on when there is enough
power to run the monitor. The ON position is normally used when operating from
an external power supply intended for continuous operation.
MODE This switch is used to set the voltage at which monitor will shut off when powered
by internal batteries. Alkaline batteries can normally be run down to about 0.75
volts. However, the monitor can be operated using rechargeable nickel-metal
hydride (NiMH) batteries as well. This type of battery should not be discharged
below about 1 volt before recharging. When using alkaline batteries, the mode
switch is in the OFF position (factory default). If rechargeable NiMH batteries are
substituted, place the MODE switch in the ON position. Note that rechargeable
NiMH batteries have only about 35% of the capacity of an alkaline C-cell, so
operation will be limited to about 10 days on a charge. However, NiMH batteries
can be recharged hundreds of times.
Figure 7 - Battery Circuit Board w/C-Cell Batteries

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The third switch assembly is a single slide switch (S3) which defines whether the 0-2.5 VDC
signals from the monitor are isolated or non-isolated. Output isolation is not required when
outputs are connected to the internal data logger. However, if the outputs are connected to
external devices through the external connection cable, putting this switch in the ISO position will
protect against possible ground loops. The isolation circuit will slightly increase the power
requirement for the monitor, resulting in a bit less battery life.
4.4 External Power / Output Connections
PQ45H units ordered with the external connection option are designed for applications where
power is to be supplied from an external source, and the two voltage outputs are to be wired to an
external device. If that option has been supplied, an interface cable will be provided.
Figure 8 below identifies the terminal connections for external power and voltage outputs. These
terminal are factory wired to a connector on the side of the case, and are connected to the
outside using the supplied interface cable.
Figure 9 below identifies the color code for signals carried by this interface cable. External power
is connected to the red and black wires. The other conductors carry the voltage outputs.
Figure 8 - Battery Circuit Board w/External Power Terminals
Figure 9 - External Connection Cable Color Code

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Part 5 – Operation
5.1 User Interface
To turn the system ON, simply press the MENU key and the display will come on.
Once the instrument is turned on, it will run continuously until it is turned off manually or the
batteries are consumed. To turn the unit off, press and hold the ENTER key until the display
shuts off (about 3 seconds). Note that the unit must be in the MEASURE menu in order for
the 3-second key press to operate.
An automatic shut-off feature may be turned on if desired in software. Activating this function will
cause the instrument to shut off after 60 minutes of operation. If you wish to operate in this way,
turn the Auto-OFF feature to ON in the DIAG menu. This mode is useful when doing short-term
measurements.
The normal continuous operating mode is intended for use with the data logger or when the
instrument outputs are used for transmitting data. In this mode, the instrument will run
continuously until the battery reaches the shutdown level. With the standard two C-cell alkaline
batteries, the unit should operate for around 30 days continuously. Using NiMH batteries will
decrease this period to about 10 days. Keep in mind that battery life in either case will be
influenced by ambient temperature. Cold temperatures will reduce battery capacity.
There is a power (PWR) switch on the battery circuit board that disconnects the batteries. This is
normally used only when the system is not to be used for a long period of time (> 3 months of
storage). Otherwise, leave this switch in the ON position.
There is a display flag "B" that will flash next to the main measurement indication when the
instrument requires battery replacement. If the battery is not replaced, eventually the unit may
not turn on in the normal operating mode. Once the low battery condition is indicated, the
instrument will only stay powered for about 5 minutes and then will shut down automatically.
Once the electronics are running, connect sample and drain lines from the water source to be
monitored. Flow is controlled internally so all that needed is to connect sample and turn on the
valve at the water source. Always connect the drain fitting first, followed by the sample inlet, to
reduce pressure effects on the sensor.

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5.2 Battery Power Circuit Board
The Q45 portable instrument is primarily operated by software settings. However, there are also
a few hardware details on the battery circuit board to note.
The battery board is a circuit board that sits in the rear of the Q45 enclosure, and connects to the
Q45 AUX port through a ribbon cable. The battery board contains the battery clips for the two C-
cell batteries and the output terminal strip for the two 0-2.5 VDC outputs. Along the left side
below the ribbon cable is an ON/OFF slide switch. This switch can be used to turn the instrument
completely OFF when not intending to use the unit for an extended period. When storing for
more than 30 days, remove the batteries.
5.3 Voltage Outputs
There are two analog voltage outputs on the battery board with a terminal strip located in the
lower right corner. The outputs are 0-2.5 VDC and may be used to send isolated data the
optional PQ45 data logger or to remotely located recorders, PLC’s, etc. Output #1 is used only for
chlorine dioxide, and Output #2 can be used for either temperature or pH (if the optional pH
sensor is used). Output 2 can also be set for O3if 2 outputs for ozone are needed.
ORG
1 2
WHITE
GREEN
10911 15
SHLD
12 1413
WARNING
BLACK RED
3 4 5 6 7 8
ACT REF
pH
BLUE
DISCONNECT POWER
BEFORE SERVICING
OR DAMAGE MAY RESULT
Model: Q45X
P/N: 07-XXXX
S/N: XXXX
Voltage: XXXX
Options: XXXX
Analytical Technology, Inc.
Tel: [phone])
LOCATED ON FRONT PANEL
NOTE: OPTIONAL DATALOGGER
OF ENCLOSURE
(REAR OF ENCLOSURE)
DC BATTERY BOARD
CONNECTIONS (TYP.)
WIRING
DATALOGGER
SHIELD
WHT
DATA CABLE
POWER CABLE
(FRONT OF ENCLOSURE)
Q45 TRANSMITTER
Figure 10 - Battery Board Connection