Watts HF Scientific AccUView LED Ex User manual

Installation Instructions
AccUView LED Ex
Online UV Analyzer for Hazardous Environments
IS-HF-AccUViewLEDEx-100125 Rev 0 2020-09

IS-HF-AccUViewLEDEx-100125 Rev 0 2
Table of Contents
Understanding Safety Information.......................................................3
Application of Council Directive...........................................................4
Standards to Which Conformity is Declared:.......................................4
Introduction to the Unit .......................................................................5
Overview.........................................................................................5
Specifications .................................................................................5
Unpacking and Inspection of the Instrument ...................................5
Instrument Labels ...........................................................................5
Display............................................................................................5
Touch Pad ......................................................................................5
Vapor Purge....................................................................................5
Installation ..........................................................................................6
Site Selection and Mounting ...........................................................6
Air Sentinel III Controller ..................................................................6
Air Dryer/Filter.................................................................................6
Plumbing & Air Connections ...........................................................6
Process Water Requirements......................................................6
Air Requirements ........................................................................6
Pressurized System ....................................................................6
Electrical Connections ....................................................................6
Power .........................................................................................7
RS-485.......................................................................................7
4-20 mA .....................................................................................7
Commissioning and Start-Up..............................................................7
Air Sentinel III LED Lamp Indicators.................................................7
Measurements................................................................................8
Warm-Up........................................................................................8
Routine Measurement.....................................................................8
Initial Operation...............................................................................8
Instrument Calibration.........................................................................8
Calibration ......................................................................................8
Calibration Error..............................................................................9
Restore Factory Settings ....................................................................9
Instrument Configuration (CONFIG Mode)...........................................9
Selecting the Output (O/P) ..............................................................9
Setting the 4-20 mA .......................................................................9
Setting the Error Level.....................................................................9
Configuring the RS-485 Port...........................................................9
Setting the Baud Rate.....................................................................9
Setting the Address ......................................................................10
Modbus Mode ..............................................................................10
Security Access Feature ...............................................................10
Extended Settings ........................................................................10
Units .........................................................................................10
Speed of Response ..................................................................10
LCD Backlight Brightness .........................................................10
Ultrasonic Cleaning ...................................................................11
RS-485 Parameter - Bits...........................................................11
RS-485 Parameter - Parity........................................................11
RS-485 Parameter - Stop Bits ..................................................11
Duty Cycle ................................................................................11
Desiccant Warning....................................................................11
4mA Adjustment .......................................................................12
20mA Adjustment .....................................................................12
Saving Configuration Settings ...................................................12
Flow Switch......................................................................................12
Modbus Communication ..................................................................12
Modbus RS-485 Output & Commands ........................................12
Coils .........................................................................................12
Valid Commands.......................................................................12
Format......................................................................................12
Valid Addresses ........................................................................12
Definitions .................................................................................12
Input Status ..................................................................................13
Valid Commands.......................................................................13
Format......................................................................................13
Valid Addresses ........................................................................13
Definitions .................................................................................13
Holding Registers .........................................................................13
Valid Commands.......................................................................13
Format......................................................................................13
Valid Addresses ........................................................................13
Definitions .................................................................................13
Input Registers .............................................................................14
Valid Commands.......................................................................14
Format......................................................................................14
Valid Addresses ........................................................................14
Definitions .................................................................................14
Exception Responses Implemented..............................................14
Routine Maintenance........................................................................14
Cleaning the Flow Through Cuvette ..............................................14
Replacing the Source LED............................................................14
Troubleshooting................................................................................15
AccUView LED Ex Fault Detection ................................................15
Readings - Troubleshooting ..........................................................15
Accessories and Replacement Parts List ..........................................15
Warranty...........................................................................................16

IS-HF-AccUViewLEDEx-100125 Rev 0 3
WARNING
!
Read this Manual BEFORE using this equipment.
Failure to read and follow all safety and use information can
result in death, serious personal injury, property damage, or
damage to the equipment.
Keep this Manual for future reference.
This is a safety-alert symbol. The safety alert symbol
is shown alone or used with a signal word (DANGER,
WARNING, or CAUTION), a pictorial and/or a safety
message to identify hazards.
When you see this symbol alone or with a signal word
on your equipment or in this Manual, be alert to the
potential for death or serious personal injury.
This symbol identifies hazards which, if not avoided,
will result in death or serious injury.
This symbol identifies hazards which, if not avoided,
could result in death or serious injury.
This symbol identifies hazards which, if not avoided,
could result in minor or moderate injury.
This symbol identifies practices, actions, or failure to
act which could result in property damage or damage
to the equipment.
!This pictorial alerts you to the need to read the
manual.
This pictorial alerts you to electricity, electrocution, and
shock hazards.
This pictorial alerts you to electricity, electrocution, and
shock hazards.
Understanding Safety Information
This manual contains safety and use instructions that must be
followed during the installation, commissioning, operation, care and
maintenance and service of the AccUView LED Ex. All responsible
personnel must read this manual prior to working with this instrument
and should familiarize themselves with the following safety symbols,
signals and pictorials.

IS-HF-AccUViewLEDEx-100125 Rev 0 4
Declaration of Conformity
Application of Council Directive
Standards to Which Conformity is Declared:
Product Safety - Tested and passed:
LC (Part 1: General Requirements UL61010-1 Issued May 11 2012 Ed 3 and CAN/CSA C22.2 #61010-1 issued May 11, 2012)
Emissions & Immunity - Tested and passed EN 61326-1:2013
Manufacturer’s Name: HF scientific, inc.
Manufacturer’s Address: 16260 Airport Park Drive, Suite 140, Fort Myers, Florida 33913
Importer’s Name:
Importer’s Address:
Type of Equipment: Process Turbidimeter
Model: AccUView LED Ex 28044
I, the undersigned hereby declare that the equipment specified above conforms to the above Directives and Standards.
Place: Fort Myers, Florida USA
Date: February 4, 2020
(Signature)
Renato Trovo
General Manager,
HF scientific, inc.

IS-HF-AccUViewLEDEx-100125 Rev 0 5
Instrument Labels
The following labels should be applied to the outside of the enclosure.
Purpose Location Label
Serial number, manufacturer,
part number, power rating,
CE & cLCus marking
Conforms to: UL 61010-1
(Ed. 3) and CAN/CSA C22.2
No. 61010-1-12 (R2017)
Side of Unit
Warning and Informational Front of Unit
Warning and Informational Front of Unit
Informational Front of Unit
Serial number, manufacturer,
part number, power rating of
AccUView LED for Ex
Side of
AccUView LED
for Ex Inside
Enclosure
Display
1- Used for reporting the %T or ABS
levels and provide user guidance to
the customer.
2- Used to communicate error
messages, measurement scale and
provide user guidance. All error
messages will be added to a queue
along with the units (%T).
3- Icons used to indicate the use of access code and offset mode.
4 - Mode Arrows used to indicate the current operating mode; AUTO
(normal operation), CAL (calibration) and CONFIG (configuration).
Touch Pad
The touchpad has 4 buttons: MODE/
EXIT, , and . The MODE/
EXIT button is used to cycle between
the three operational modes of the
instrument: CAL, CONFIG and AUTO
(Measurement) Mode. The button
enters the option (or mode that is
highlighted or chosen). The and 
buttons are used to change settings.
Vapor Purge
The AccUView LED Ex is equipped with a continuous vapor purge
system. System heat is used to warm the air. A fan inside the
instrument continuously circulates heated dry air around the optical well
and the flow through cuvette. This feature eliminates the need for a dry
purge line.
Introduction to the Unit
Overview
The AccUView LED Ex Online UV Analyzer has been specially designed
for operation in hazardous atmospheres, meeting IECEx and ATEX
ratings as stated in the specifications. The analyzer uses an IECEx
approved purge/pressurization controller called the Air Sentinel III.
This allows for the monitor to safely measure the UV transmittance or
absorbance of process water online while in a hazardous environment,
Zone 1.
Specifications
Measurement Range 0 – 100.0 %T
0 – 2.0 ABS
Repeatability ± 1.0 %T
± 0.002 ABS
Resolution 0.1 % T
0.0004 ABS
Accuracy ± 2.0 % T
± 0.008 ABS
Response Time User selectable from 4 to 60 seconds
Path Length 21.5 mm
Display Multi-Line Liquid Crystal Backlit Display
Analog Output Powered loop isolator 4-20 mA, 600 Ω drive (either 4-20mA
or Modbus can be used)
Communications Port Bi-directional RS-485 with Modbus (either 4-20mA or
Modbus can be used)
Maximum Water Pressure 1380 kPa (200 psi.) with integral pressure regulator
Flow Rate 100 ml/min. – 1.5 liter/min. (.026-.26 Gal/min) flow switch
set for 150 ml/min.
Operating Temperature 0°C – 55°C (32°F – 131°F)
Wetted Materials Nylon, Quartz, Silicone, Polypropylene, Stainless Steel,
Polyethylene, NORYL®, Ryton, Fluorocarbon, PVC
Sample Temperature Range 0°C – 50°C (34°F – 122°F)
Power Supply 100– 240 VAC, 47 – 63 Hz, 90VA
Insulation Rating Double Insulated, Pollution Degree 2, Overvoltage Category II
Environmental Conditions IP55 Rated - The unit is intended for indoor use.
Altitude up to 2000 meters
Up to 95 % RH (non-condensing)
IECEx Hazloc Rating Ex pxb IIC T4 Gb 0°C ≤ Ta ≤ 55°C
Ex = Explosion protected
pxb = Keeps dangerous atmosphere outside by
overpressure, mandatory power off when pressure drops
IIC = Gas group (classified as most dangerous gases)
T4 = Temperature classification
Gb = Zone 1 (gas)
0°C ≤ Ta ≤ 55°C = Ambient Temperature Range
IECEx File # IEC Ex LC 19.0013X
Compressed Air
Requirements
Water and oil-free, Particles <5u, ISA Grade Hydrocarbon
Free. Full time clean dry air at 5.5 - 7 bar (80 - 101.5 PSI)
@ 35 SLPM (1.2 SCFM) @ 20oC (68oF) Max
Regulatory Compliance
And Certifications
DNV-GL, USCG, IASC UR E-10 REv 7, IECEx, ATEX, CE, UL
61010-1 (Ed. 3) and CAN/CSA C22.2 No. 61010-1-12
(R2017)
Shipping Weight 27.2 kg (60 lbs.)
NORYL is a registered trademark of SABIC Innovative Plastics IP B.V.
Unpacking and Inspection of the Analyzer
Remove all items from packing carton and carefully inspect to ensure
that no visible damage has occurred during shipment and that all items
listed below have been received. If the items received do not match
the order, please contact your local distributer or the HF scientific
Customer Service department.
• AccuView LED Ex Analyzer
• Instruction Manual
• Quartz Cuvette with Ultrasonic Transducer (Single Pack)
• 100% T Calibration Standard

IS-HF-AccUViewLEDEx-100125 Rev 0 6
Installation
Site Selection and Mounting
The instrument is designed for wall mounting. The instrument should
be mounted at eye level and be easily accessible for operation and
service. Recommended mounting screws are M8 (5/16”) fasteners for
the instrument enclosure.
It is critical that the instrument be mounted as close as possible
to the sampling point to ensure a quick response time (within 2
to 3 meters (6 to 10 feet) of the sampling point).
Air Sentinel III Controller
The AccUView LED Ex will not function without proper air purging of
the enclosure. The Air Sentinel III Controller governs the power. See
Ekectrical Connections section.
Air Dryer/Filter
For proper operation, dry clean air must be supplied to the AccUView
LED Ex at pressures between 5.5 and 7 bar (80 to 101.5 PSI). The
dryer comes with fittings suitable for use with 6mm tubing. If using the
supplied fittings for installation, ensure that a proper thread sealant is
used.
Plumbing & Air Connections
Process Water Requirements
Required Head Pressure 6.9kPa (1 PSI)
Flow Requirements 100ml/min to 1.5 liter/min
(0.026 to 0.26 Gal/min
Max Pressure Allowed by Pressure Regulator 1380kPa (200 PSI)
Allowable Fluid Temp 0°C - 50°C (34°F - 122°F)
Flow Switch Requirements (to prevent screen indication) 150 ml/min
Air Requirements
Required Air Pressure 5.5 to 7 bar (80-100 PSI)
Required Air Flow 35 l/min
The instrument is equipped to be plumbed using 6mm OD copper
or stainless steel tubing for the sample water inlet, drain and air. The
fittings are swagging type connections.
The emergency drain is not equipped for a connection.
Pressurized System
The AccUView LED Ex comes standard with a pressure regulator. The
regulator is rated for use up to 1380 kPa (200 PSI) and will lower the
pressure down to a pressure more suitable for use in the AccUView
LED Ex. If inlet pressures can exceed 325 kPa (47 PSI) use appropriate
tubing to connect to the AccUView LED Ex.
Electrical Connections
All of the electrical connections to the instrument are made at the
DIN rail connector. The connections are labeled beside the terminal
block and are self-descriptive. Please follow all local and government
recommendations and methods for installation of electrical connections
to and between the instrument and other peripheral devices.
Plugs are inserted into the 4-20mA/RS-485 cable bulkheads when
shipped to ensure a watertight seal. These plugs can be removed and
discarded when connecting to either of these connections.
The power cable bulkhead will accept cable diameters from 5.8mm
(.23”) up to 10mm (.395”). All terminals are designed to accept wires
in the range of 14 to 28 AWG. All wires should be stripped to a length
of 6mm (.25”). A strain relief strap is provided to reduce tension on the
power terminals.
It is the user’s responsibility to ensure that the water and air tight seal
is maintained after the connection has been wired for operation. If any
of the glands are not tightened properly around a cable or plug, the
ratings of the instrument will be jeopardized and there is a possibility of
creating a shock hazard.
577mm 508mm
289mm
254mm
539mm
356mm
402mm
Sample Water
Drain
Air Connection
Emergency
Drain
Sample Water
Inlet
When using this instrument in potable water applications,
the drain water from this instrument should NEVER be
reintroduced back into the incoming water stream. This
water MUST be directed to a convenient drain.
NOTICE
Air Dryer/Filter
Gland Recommended
for Mains Power Inlet
Gland Recommended for
low voltage signals
4-20mA or Modbus
Gland Recommended for
Alarm Connections
Side View - Electrical Glands on Enclosure
Installation of this instrument involves line voltage that could
endanger life. Only qualified electricians should perform
installation of the instrument.
DANGER
!
Element Replacement
Indicator - The red ring
will pop up when the
element needs to be
replaced.
Ask mike why no min listed for allowable
uid temp

IS-HF-AccUViewLEDEx-100125 Rev 0 7
4-20 mA
The 4-20 mA output is driven by a 15 VDC power source and can drive
recorder loads up to 600 ohms. Do not run 4-20 mA cables in the
same conduit as power. Operation of this output is covered in the
Setting the 4-20 mA section. The outputs are equipped standard with
an installed loop powered isolator (500V isolation).
For ease of connecting, remove the plug-in DIN rail mount connector.
Polarity of the connections is labeled next to this connector.
Commissioning and Start-Up
1. Once all water, air and electrical connections have been made, turn
on power to the Air Sentinel III.
2. The Air Sentinel III will run through an automatic seven-minute purge
cycle.
3. Once the purge cycle is complete, power will then be supplied to
the AccUView LED Ex.
If at any time there is a loss of pressurization in the electrical enclosure,
the Air Sentinel III will remove power to the AccUView LED Ex.
Air Sentinel III LED Lamp Indicators
Lamp Color Matrix Operation
Power to
AccUView LED Ex Condition
All Lamps GREEN Safe Operation ON Normal Operation
Timer Lamp RED Instrument is
Purging
OFF If pressure lamp is green,
the instrument is purging.
Pressure Lamp RED Unsafe Operation,
Low Pressure
OFF Insufficient Air Pressure
By Pass Lamp RED Unsafe Operation ON By-Pass key enabled
NO lamps No power out
applied
OFF No power applied to Air
Sentinel III
The AccUView LED Ex is ready for operation when the Air Sentinel III
displays all green LED lamps.
Power
It is recommended that a circuit breaker be placed in a safe area prior
to the power connection to allow for service. Mains connection should
only be made to the Air Sentinel III. See Side View image above for
gland selection. The AccUView LED Ex is not supplied with a
power cord.
The Air Sentinel III purge controller requires 100-240 VAC 47-63 Hz.
A circuit breaker must be placed prior to the power connection in close
proximity and within easy reach to allow for service. This circuit breaker
must be marked to indicate that it is a disconnecting means for the
instrument. The rating of the circuit should be 5A.
Supply power connections are made ONLY to top “MAINS” connection
on the back of the Air Sentinel III purge controller:
Terminal 3: Earth Ground
Terminal 2: Neutral
Terminal 1: Line or Hot
Suitable wire would be stranded, 3
conductors 18-12 AWG copper or tin
plated copper with a voltage rating of
600 VAC with a temperature rating of
90°C or higher.
Common earth bond points are
provided both inside the enclosure
on the chassis and outside of the
enclosure. This terminal set can be removed for easier connections.
Please ensure this terminal set is properly tightened using the two side
screws.
RS-485
The RS-485 Modbus or special protocol half-duplex (2-
wire) digital interface operates with differential levels that
are less susceptible to electrical interferences. This is why
cable lengths up to 3000 feet can be implemented. The
last device on each bus may require terminating with a
120-ohm resistor to eliminate signal reflection on the line.
DO NOT run RS-485 cables in the same conduit as
power.
For ease of connecting, remove the plug-in DIN rail mount
connector. Connections are labeled next to this connector.
The instrument can accept 100-240 VAC, 47-63 Hz. Verify that
the mains voltage falls within these specifications.
DANGER
!
To prevent damage to the instrument, ensure that power is
disconnected prior to making connections.
NOTICE
To prevent damage to the instrument, ensure that power is
disconnected prior to making connections.
NOTICE
A by-pass key is provided for operating the AccUView LED Ex
with the enclosure open. This is an unsafe operating condition.
It is very important that the operator checks the operating
atmosphere and determines that it is safe, before opening the
enclosure. This is intended as a temporary operating condition.
Do not operate the Air Sentinel for long periods of time in the
bypass mode. This is intended only for maintenance operations.
Do not operate the Air Sentinel in bypass mode unattended.
DANGER
!
Back-Pressure Clamp
Outlet
Connection
Junction Box
Inlet
Connection
Flow Switch
Pressure
Regulator
Inlet Clamp
Instrument
Cable
Modbus / 4-20
Output Terminal
Only qualified electricians should be allowed to perform the
installation of the instrument as it involves a line voltage that
could endanger life.
DANGER
!

IS-HF-AccUViewLEDEx-100125 Rev 0 8
Measurements
This process monitor allows for the measurement of the transmittance
of process water online. Process water is usually reported in %T.
Readings above 102 %T are indicated by a flashing display. Readings
above 100 %T indicate that the current sample is better than the
calibration water. Readings above 110 %T are not possible. All
readings are path length corrected to 10mm.
Measurements can also be taken in Absorbance. Negative Absorbance
readings indicate the need for a calibration or that the water tested
is better than what the instrument was calibrated to. These readings
show ABS on the lower line of the display. All readings are path length
corrected to 10mm.
Warm-Up
The AccUView LED Ex requires a 30 minute warm-up period. To
improve the accuracy, allow the AccUView LED Ex to complete warm-
up time before calibrating. During the warm-up period, the display may
flash, indicating that it has detected a temperature change. This is
normal operation during the warm-up period.
Routine Measurement
1. Apply power to the instrument and allow the unit an initial warm up
of 30 minutes.
2. When a continuous process stream is flowing through the
instrument, the instrument will display the measured %T or ABS
level of the sample on the LCD screen. In addition, the equivalent
signal is provided on the analog (4-20 mA) output or the digital
output, depending on the options selected.
Initial Operation
Be sure that the cuvette is tightly installed on the flow through unit prior
to introducing water to the unit. The cuvettes are pressure checked at
the factory but could have loosened during shipping.
The instrument is factory calibrated. However, for the best accuracy,
the flow through cuvette should be locked in place and calibration
should be done with DI water. Refer to next section for complete
calibration instructions.
Instrument Calibration
The instrument is calibrated and tested prior to leaving the factory.
While it is possible to use the instrument directly out of the box, but for
the most accurate measurements, calibration is recommended before
initial use. Under normal conditions, recalibration is recommended at
least once a month. To get the greatest accuracy, calibrating once a
week may be necessary.
The two cuvettes supplied with the instrument may be exchanged with
one another. One cuvette should always be kept clean for replacement
when calibrating.
The instrument is designed to store the last reading prior to calibrating.
The 4-20 mA is held at this stored reading and will not change until
calibration is complete. 30 seconds after completion of the calibration
the AccUView LED Ex will start taking online measurements. These
measurements will be averaged with the stored reading (depending
on setting). In order to prevent disruptions in data, the operator should
release the clamp to allow the sample water to flush out the calibration
water as soon as calibration is complete.
While in calibration mode, the instrument has a time-out feature that
automatically returns the system operation to the AUTO mode after a
15-minute period of inactivity.
Calibration
1. Press the MODE/EXIT one time to enter calibration mode. The
arrow besides CAL will be illuminated. The lower display will show
alternating with either 100 (indicating that 100%T standard is
selected) or 0(indicating that 0.000ABS standard is selected).
Once entering calibration mode, the last reading is stored and the
equivalent reading is being output on the 4-20 mA signal. This
output will be held after the instrument returns to AUTO, allowing
time for the flow to be restarted.
2. Using the shutoff clamp, close off the flow of water.
3. Remove the flow through cuvette and retain for future use.
4. Fill the second clean cuvette with 100% T calibration fluid and
reinstall the filled cuvette tightly on the flow through unit.
5. Wipe flow through unit dry, install and lock in place.
6. Press the button to start the calibration.
7. The upper display will count down the progress of the calibration
step. The instrument will return to AUTO mode at the end of the
calibration.
8. Release the shutoff clamp to restore sample flow. DO NOT move
or remove flow through cuvette after calibrating.
The last reading before calibration may be displayed for at least 30
seconds after completing calibration. The length of time it takes to
show the current reading will depend on the response time and lamp
duty cycle settings.
There is no need to recalibrate when changing ranges from %T to ABS
or reverse.
A flashing display may occur after warm-up. This is an
indication that either the ambient or water temperature has
changed rapidly. During this time, the readings may be slightly
out of the specified accuracy. The AccUView LED Ex will
automatically compensate as soon as the rate of temperature
change slows.
NOTICE
Screen Display - Calibration Menu (100% T) Screen Display - Calibration Menu (0.000ABS)
CAUTION
!
The UV lamp is very low power but it is recommended to avoid
looking directly into the optical well while the flow through unit
is removed.
Arrow Indicates
Normal Operation Measured
Reading
Measurement
Scale (%T or ABS)
Screen Display - Normal Operation

IS-HF-AccUViewLEDEx-100125 Rev 0 9
Calibration Error
If this screen is displayed after calibration is complete, the internal
diagnostics have determined that the calibration fluid or the flow
through cuvette requires replacement. Check the calibration fluid and
cuvette and then recalibrate or restore the factory calibration. The
instrument cannot be used without performing one of these operations.
See Restoring Factory Settings section for more information.
To recalibrate, press the MODE key and start the calibration sequence
again.
Restore Factory Settings
If the instrument is unable to perform a calibration due to a low lamp
output, bad calibration standard or a dirty cuvette, the instrument will
display CAL and Err on the display. If the problem is determined to be
a poor calibration or low lamp, fix the problem and recalibrate. If the
problem cannot be determined, the instrument must be restored to the
factory calibration and configuration settings.
To restore factory settings:
1. Push and hold the button.
2. Push and release the button and then release the button.
The instrument has now been restored to it’s original factory settings.
Instrument Configuration
(CONFIG Mode)
The instrument has the ability to be customized at any time during
operation. CONFIG Mode has been split into sub-menus to facilitate
instrument configuration. While in Configuration Mode, the instrument
has a time-out feature that automatically returns the system operation
to AUTO mode after a 15 minute period.
To enter CONFIG Mode:
1. Press the MODE/EXIT button until the arrow next to CONFIG is
illuminated.
2. Press the button. You are now in CONFIG Mode.
3. To exit CONFIG Mode, press the MODE/EXIT button.
Selecting the Output (O/P)
The first configuration sub-menu is the O/P. The O/P options are:
• 4-20 for the 4-20 mA output
• 485 for the RS-485 and modbus
• OFF if no outputs are required
1. Using the and buttons, select the desired output.
2. Once the desired output has been selected, press the button to
set it.
The next prompts will depend on the output selected. For RS-485 and
Modbus, certain combinations of settings are not allowed and some
menus will not appear based on previous selections.
Setting the 4-20 mA
If the 4-20 mA output was selected, you will be asked to set the 4mA
(4MA) and 20mA (20MA) %T or ABS limit levels.
1. Select the %T or ABS level you wish to assign to the 4MA setting
using the and buttons. The factory setting is 90%T or 0 for
ABS.
2. Once the desired level has been selected, press the button to set it.
The 4MA level cannot be set higher than the 20 MA level.
3. Select the %T or ABS level you wish to assign to the 20MA setting
using the and buttons. The factory default setting is 100%T or
2 for ABS.
4. Once the desired level has been selected, press the button to set it.
The 20MA level cannot be set lower than the 4MA level.
Setting the Error Level
In case of an error in the AccUView LED Ex, the 4-20 mA reading can
be used to indicate a problem by sending the output to either:
• 4.00 mA
• 2.00 mA
• 0 mA
• OFF - In the case of OFF, the 4-20mA is unaffected by any error
condition. OFF is the factory default setting.
1. Select the desired ERLV using the and buttons.
2. Once the desired level is selected, press the button to set it.
Configuring the RS-485 Port
If the instrument is wired for this option and the I/O selection is
changed to 485, prompts will appear for setting the baud rate and the
address.
Setting the Baud Rate
1. Select the desired baud rate (1200, 2400, 4800, 9600 or 19200) for
operation of the I/O using the and buttons. Factory setting is
19200 baud.
2. Once the desired baud rate is selected, press the button to set it.
Restoring the factory settings allows the use of the AccUView
LED Ex with reduced accuracy. The original problem still
exists and must be determined and corrected before accurate
operation of the AccUView LED Ex will be resumed. The
AccUView LED Ex will always reset to %T and factory defaults
after restoring.
NOTICE
Screen Display - Setting the Error Level
Screen Display - Calibration Error
Screen Display - Setting the 4-20 mA limits
Screen Display - Setting the Baud Rate

IS-HF-AccUViewLEDEx-100125 Rev 0 10
Setting the Address
The last selection is the address. The address is important when
multiple instruments are wired on a single string. Each instrument
MUST have a unique address. The factory default is Address 1.
1. Select the desired instrument address using the and buttons.
2. Once the instrument address is selected, press the button to set it.
Modbus Mode
To enable the Modbus mode, select ASCII or RTU. For more
information, refer to the Modbus section later in this manual.
Security Access Feature
The instrument is equipped with a security access feature that can be
activated in Configuration Mode. If this option is turned on, the user
is required to enter the access code into the instrument to get to any
mode other than AUTO. The security code is 333 and may not be
changed.
If the security feature is enabled, the screen shown below will appear
when the MODE/EXIT button is pressed.
The security code (333) must be entered to gain access to CAL or
CONFIG menus. Flashing digit indicates that is the number to be
entered.
1. Use the or buttons to select the first of the three numbers in
the code.
2. Press the button to set the first number.
3. Repeat steps 1 and 2 for the remaining two numbers in the code.
If the valid access code has been entered, the instrument will switch
to Calibration Mode (CAL). If the configuration mode (CONFIG) is
needed, push the MODE/EXIT button one more time.
If the wrong access code is entered, the instrument will return to the
AUTO mode.
Extended Settings
The last few settings are grouped together to prevent them being
unintentionally changed. To gain access to the extended settings:
1. Use the and buttons to select ON.
2. Press the button to enter the extended settings menu.
Units
This instrument can measure in either ABS or %T. This selection affects
menus prior to the Extended Settings menu.
1. Use the and buttons to select the desired unit of
measurement.
2. Once the desired unit of measurement is selected, press the 
button to set it.
Speed of Response
The speed of response for both displayed and output values can be
adjusted. There are 10 response speed options; the factory default is 3.
The response is simply an average of the previous readings combined
with the current reading. If the setting is 1, only the current reading is
displayed. If the setting is 10, the last 9 readings are averaged with the
current reading.
1. Use the and buttons to select the desired speed of response.
2. Once the desired speed of response has been selected, press the
button to set it.
LCD Backlight Brightness
The backlit LCD allows for easier readability of the LCD display in low
light or no light conditions. The backlight is intended for continuous
operation.
The LCD backlight brightness has 10 brightness levels available; the
factory brightness level is 8.
1. Use the and buttons to select the desired brightness.
2. Once the desired brightness is selected, press the button to set it.
Screen Display - Setting the Address
Screen Display - Security Access On
Screen Display - Security Access Enabled
Screen Display - Extended Settings
Screen Display - Units
Screen Display - Response Time
Screen Display - LCD Brightness

IS-HF-AccUViewLEDEx-100125 Rev 0 11
Ultrasonic Cleaning
This option is used to continuously clean the flow through cuvette. It is
not intended to clean cuvettes that are already dirty or replace manual
cleaning entirely. The system will increase the time between cleanings
dramatically. Please note that the system requires the use of a special
cuvette. This cuvette must be used for the system to operate correctly.
The system works by sending an ultrasonic frequency through spring
connections into a piezo transducer bonded to the bottom of a flow
through cuvette. The ultrasonic frequency generated by the cleaning
system is virtually not detectable at 1 meter distance with the enclosure
door open or closed.
The system can detect that an incorrect cuvette is installed, an error
has occurred in the transducer or the transducer is not making contact
with the spring connections. This error is indicated by CLN on the
screen. Since this is an error condition, the 4-20mA will be affected
based on the set error level.
After installing a flow through cuvette, there will be a 30-minute period
where the ultrasonic circuit will not operate to allow the vapor purge
system to remove all moisture from the ultrasonic transducer.
Even with the above drying system, it is still recommended that
ultrasonic cuvettes be dried by hand, including the transducer on the
bottom, prior to use.
Ultrasonic cleaning has the option to be turned OFF. The default
setting is On.
1. Use the and buttons to select the desired cleaning option.
2. Once the desired cleaning option is selected, press the button to
set it.
RS-485 Parameter - Bits
This is the first of three menus to setup the RS-485 parameters. These
menus will only appear if the RS-485 mode is selected. There are 2
options, 7 or 8 bits; the factory default is 8 bits.
1. Use the and buttons to select the desired bits selection.
2. Once the desired option has been selected, press the button to
set it.
RS-485 Parameter - Parity
There are 3 parity options in this menu. Those options are No Parity
(nOnE), odd parity (Odd) or even parity (E); the factory default is no
parity.
1. Use the and buttons to select the desired parity option.
2. Once the desired option is selected, press the button to set it.
RS-485 Parameter - Stop Bits
There are 2 options for this menu, 1 stop bit or 2 stop bits; the factory
default is 1 stop bit.
1. Use the and buttons to select the desired stop bit setting.
2. Once the desired option has been selected, press the button to
set it.
Duty Cycle
The duty cycle determines how often the LED turns on and updates
the reading. The LED will operate for 1 second each time to obtain
readings. The duty cycle can be set from 4 to 60 seconds; the factory
default is 6 seconds. This setting also affects the life of the LED. With
the duty cycle set to 4 seconds, the life of the LED is about 4 years.
The factory default setting of 6 seconds will theoretically extend the
LED life to over 5 years. The 60 second setting theoretically extends
the life of the LED to about 14 years, but will delay all updates.
1. Use the and buttons to select the desired number of seconds
for the duty cycle.
2. Once the desired number of seconds has been selected, press the
button to set it.
Desiccant Warning
When the humidity detector in the AccUView LED Ex indicates that the
internal environment is close to the point where humidity may cause
condensation, the instrument will display DESC as a warning on the
screen. The default setting is OFF, which means it will only display
DESC on the screen. Turning the setting to ON will affect the 4-20mA
signal based on the set error level as well as display the DESC warning
on the screen. Refer to Setting the Error Level section earlier in the
manual.
1. Use the and buttons to select the desired option.
2. Once the desired option is selected, press the button to set it.
Screen Display - RS-485 Bits
Screen Display - RS-485 Parity
Screen Display - Ultrasonic Cleaning
Screen Display - RS-485 Stop Bits
Screen Display - Duty Cycle
Screen Display - Desiccant Warning

IS-HF-AccUViewLEDEx-100125 Rev 0 12
4mA Adjustment
If the 4-20mA setting is turned ON (see section Setting the 4-20mA
Output for more information) the following menu along with the 20mA
Adjustment menu will appear. The first menu outputs a constant
4mA while allowing for a small amount of adjustment. This allows the
operator to make the AccUView LED Ex align with a PLC or SCADA
system. The adjustment limits are ±200 counts or about ±0.2mA. This
setting will differ slightly on each instrument, as each AccUView LED Ex
will be factory set to 4.00mA.
1. Use the and buttons to select the desired adjustment for the
4mA adjustment setting.
2. Once the desired adjustment has been selected, press the button
to set it and move on to the 20mA Adjustment menu.
20mA Adjustment
This menu operates in the same way as the 4mA menu. This menu
outputs a constant 20mA while allowing for a small amount of
adjustment. This setting will be slightly different on each instrument, as
each AccUView LED Ex will be factory set to 20.00mA.
1. Use the and buttons to select the desired adjustment for the
20mA adjustment setting.
2. Once the desired adjustment has been selected, press the button
to set it.
Saving Configuration Settings
If the extended settings are set to OFF, pressing the button will save
all settings and the AccUView LED Ex will automatically return to the
normal AUTO mode of the instrument.
If extended settings are set to On, after the last menu of the extended
settings, pressing the button will save all settings and the AccUView
LED Ex will automatically return to the normal AUTO mode of the
instrument.
The CONFIG menu may be used at any time to reset or change any
of the parameters. The CONFIG menu may be exited at any point in
the menu by using the MODE/EXIT key. Any features that have been
modified will be saved.
While operating in CONFIG mode, the reading before entering that
mode is held.
Flow Switch
The AccUView LED Ex comes standard with a flow switch installed.
There is an additional menu in the configuration which gives you the
selection of ON or OFF.
If “Low Flow” is enabled, a flow of less than 150ml/minute (.04 GPM)
will cause a screen indication. The flow switch can act on the 4-20mA.
A “Low Flow” will affect the 4-20mA signal based on the set error level.
A modbus register is also set. The condition takes 2-1/2 minutes of low
flow to actuate or restore.
Screen Display - 20mA Adjustment
Modbus Communication
The AccUView LED Ex uses a communication protocol called Modbus.
A company, called Modicon, developed the Modbus protocol for use
with their programmable controllers. Since that time, Modbus has
evolved into a common communication protocol in the industry.
The communication method involves using a master-slave technique,
in which there is one master and several slaves. The AccUView LED
is a slave device. Only the master can initiate queries. These queries
are directed to an individual slave device and the appropriate slave
responds with the requested data.
A broadcast message can be sent to all slaves. The slave devices do
not answer these broadcasts.
There are two transmission modes. These modes are known as
RTU (Remote Terminal Unit) and ASCII (American Standard Code for
Information Interchange).
The AccUView LED can be setup in a network of up to 255 slave
devices. Each device must have a different address (1-255). The
instrument can be set for either RTU or ASCII mode.
Modbus RS-485 Output & Commands
Coils
These single-bit values are readable and changeable from the master.
The data will be returned with the lowest addressed coil in the LSB of
the data. Unused bits in the data will be set to 0. True is a 1 and False
is a 0.
Valid Commands
Code Name Broadcast
0x01 Read Coil Status No
0x05 Force Single Coil Yes
Format
16-bit word format
MSB LSB
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Valid Addresses
00001 - 00XXX
Definitions
Address Function Default
00001 Offset added False
00002 Flow alarm selected False
00003 Access code enabled False
00004 Ultrasonic cleaning enabled (if available) True
00005 Desiccant set as error (True) or warnings (False) True
Screen Display - 4mA Adjustment

IS-HF-AccUViewLEDEx-100125 Rev 0 13
Input Status
These single-bit values are readable from the master. The data will be
returned with the lowest address input status in the LSB of the data.
Unused bits in the data will be set to 0.
Valid Commands
Code Name Broadcast
0x02 Read Input Status No
Format
16-bit word format
MSB LSB
Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Valid Addresses
10001 - 10XXX
Definitions
Address Function
00001 Instrument error
00004 Calibration error
00005 Desiccant error
Holding Registers
These 16-bit values are readable and changeable from the master. The
data is stored and transmitted with the MSB first and then the LSB.
Valid Commands
Code Name Broadcast
0x03 Read Holding Registers No
0x06 Preset Single Register Yes
0x16 Preset Multiple Registers Yes
Format
Float - stored in two consecutive addresses with the first address
containing the least significant word (lower part of mantissa) and the
second address containing the most significant word (sign, exponent
and upper part of mantissa).
Valid Addresses
40001 - 40XXX
Definitions
Address Type Register Value Default Function
40001, 40002 Float Offset value -- 0.0 0.0 - 2.0
40003 Int Decimal places 0 2 XXXXX.
1 XXXX.X
2 XXX.XX
3 XX.XXX
4 X.XXXX
40004 Int Response time -- 10 1 - 100 seconds
40005 Int LCD backlight -- 8 1 - 10 (brightest)
40006 Int Output option 0 0 None
14-20 mA
2RS-485 (if available)
40007, 40008 Float 4-20 mA minimum
value
-- 0.02 0.0 to max range of
instrument
40009, 40010 Float 4-20 mA maximum
value
-- 10.0 0.0 to max range of
instrument
40011 Int RS-485 baud rate 0 3 1,200
1 2,400
2 4,800
3 9,600
4 19,200
40012 Int RS-485 0 1 7
1 8
40013 Int RS-485 Parity 0 0 None
1 Even
2 Odd
40014 Int RS-485 Stop Bits 1 0 1 stop bit
2 1 1 stop bit
40015 Int Instrument address -- 1 1 - 255
40016 Int Modbus serial mode 0 0 RTU
1 ASCII
40028 Int LED Lamp Current -- 40 2 - 40

IS-HF-AccUViewLEDEx-100125 Rev 0 14
Routine Maintenance
Cleaning the Flow Through Cuvette
Measurement cuvettes used for the flow through should be clean and
free of marks or scratches. The interior and exterior of the cuvette can
be cleaned with a detergent solution and then rinsed several times with
distilled or de-ionized water.
To replace the cuvette:
1. Shut off the flow using the provided shutoff clamp.
2. Unscrew the old cuvette and replace with a fresh, clean cuvette.
3. Recalibration is required for accurate operation.
Replacing the Source LED
The life of the UV source lamp in the AccUView LED Ex is dependent
on the setting of the Duty Cycle and operating conditions. See section
on Duty Cycle for more information on the LED life.
When the UV source LED requires replacement, it is required to open
the enclosure. Contact the HF scientific Customer Service department
before servicing or to purchase a service module.
Input Registers
These 16-bit values are readable by the master. The data is stored with
the MSB first and then the LSB.
Valid Commands
Code Name Broadcast
0x04 Read Input Registers No
Format
Float - stored in two consecutive addresses with the first address
containing the least significant word (lower part of mantissa) and the
second address containing the most significant word (sign, exponent
and upper part of mantissa).
Valid Addresses
30001 - 30XXX
Definitions
Address Type Register Value Function
30001, 30002 Float Sensor reading -- The meter reading
30003, 30004 Float Sensor reading raw -- Sensor reading to six
significant places
30005 Int Version major -- Software version major
number
30006 Int Version minor -- Software version minor
number
30007 Int Version revision -- Software version revision
number
30008 Int Model number -- Product number
30009 Int Model suffix number -- 0 if no options
30010 Int Reading status 1 Normal
2Over range
3Under range
6Reading problem
30011 Int Instrument error
summary (bit-mapped)
0x0000 Normal
0x0001 Error
0x0008 Calibration error
30012 Int Errors (bit-mapped) 0x0000 Normal
0x0001 Desiccant Warning
0x0002 Break in the 4-20 mA
0x0004 Calibration error
0x0010 Data over-range
0x0020 Flow switch alarm
0x0040 Lamp problem
0x0080 Auto-cleaning problem
0x0100 General error
0x0200 General error
0x0400 General error
30013 Int PCB revision 0Revision 1
1Revision 2
Exception Responses Implemented
Code Name Meaning
00 -- No Error
01 Illegal function The function code is not allowed in the device.
02 Illegal Data Address The data address is not allowed in the device.
03 Illegal Data Value A value contained in the query field is wrong for the device.
Ensure the cuvette is tightened to the flow through assembly
before each operation. After replacing a cuvette, it is
recommended that the water be run with the flow through not
installed to allow for inspection of the seal.
NOTICE
Specific condition of use: Parts of the enclosure are non-
conducting and exceed the maximum permissible resistance
according to the IEC 60079-0. Therefore, to avoid electrostatic
charge build-up, it must not be rubbed or cleaned with
solvents or a dry cloth when installed/used within a potentially
explosive atmosphere.
WARNING
!

IS-HF-AccUViewLEDEx-100125 Rev 0 15
Troubleshooting
AccUView LED Ex Fault Detection
The AccUView LED Ex performs continuous diagnostic monitoring.
There are 3 levels of fault detection: warnings, errors and failures. Any
faults are displayed in a queue form in the bottom row of the display.
A warning is a screen indication of a problem.
An error indicates a fault or a problem that can usually be corrected by
the operator. During an Error, the 4-20mA output will be affected based
on the set error level. If an error occurs, the instrument will still display
readings and warnings, however the accuracy is unknown and the
readings should not be trusted.
A failure is a system fault. This is NOT a problem the operator can
correct and the unit must be returned to the factory for service. If a
failure occurs, the instrument will not function properly. The 4-20mA
output will be affected based on the set error level.
Type of Fault Display Reading Possible Cause Solution
Failure FAIL Major system failure. Contact HF scientific
Technical Service or
Customer Service
Department.
Warning Flashing %T or ABS
reading
Reading may be
above 102%T.
Recalibrate the
instrument.
Water temperature
changed rapidly.
Allow water temperature
to stabilize.
Error LAMP LED Failed Replace lamp. Refer to
Replacing the Source
LED section.
Error MA 4-20 mA loop open Check wiring. See
Setting the 4-20mA
section.
Error CAL Err 100%T or 0 ABS
calibration failure.
Replace the flow
through cuvette.
Replace the calibration
fluid.
Error TECO Temperature
Compensation
Calibration failed.
Contact HF scientific
Technical Service or
Customer Service
Department.
Error DESC Humidity is higher
than the set point.
Check air supply.
Error FLOW Sample flow has
stopped.
Restore flow.
Error CLN The ultrasonic
transducer is not
making contact
with the spring
connections.
Adjust the cuvette to
be sure it is making
contact with the springs
connections.
The flow through has
been removed.
Put the flow through
back in place.
For questions or concerns, please contact HF scientific Technical
Service or Customer Service Department.
Readings - Troubleshooting
Symptom Possible Cause Solution
Readings are lower than
expected.
Bubbles in the solution. Ensure that the drain vent is
open and not obstructed.
Apply back-pressure using
the back-pressure clamp.
For severe cases of bubbles,
a stilling chamber is
available (Part #20106).
Condensate or leaky cuvette. Check flow through cuvette
for condensate or leaks.
Flow through cuvette. Clean cuvette as described in
the Maintenance section.
Instrument out of calibration. Recalibrate the instrument as
described in the Instrument
Calibration section.
Readings are erratic. Bubbles in the solution. See above solution.
Debris in flow through. Clean debris from the
cuvette.
If you need assistance regarding this instrument, please contact the HF
scientific Technical Service or Customer Service Department.
Accessories and Replacement
Parts List
Catalog Number Accessory Description
19323 100%T Calibration Solution - 500ml
Contact Factory Replacement Electronics Service Module
24232S Replacement Quartz Cuvette with Ultrasonic Transducer
100125 Operation Manual, AccUView LED Ex
24306S Replacement Pressure Regulator
28474 Replacement UV LED Assembly
21062 Tubing Kit (1-Shutoff Clamp, 1 Back-pressure valve, 2 connecting
tubings with fittings for flow through assembly, drain vent)
28044 AccUView LED Ex Instrument
28161 Air Prep Kit with Dryer
To order any accessory or replacement parts, please contact HF
scientific Customer Service Department.

IS-HF-AccUViewLEDEx-100125 Rev 0 2020-09 100125 © 2020 HF scientific
Warranty
HF scientific, LLC (the “Company”) warrants each product to be free from defects in material and workmanship under normal usage for a period
of two (2) years from first use or three (3) years from date of invoice, whichever occurs first. In the event of such defects within the warranty period,
the Company will, at its option, replace or recondition the product without charge. Parts, which by their nature are normally required to be replaced
periodically, consistent with normal maintenance, specifically reagents, desiccant, sensors, electrodes and fuses are excluded. Also excluded are
accessories and supply type items.
Proof of purchase (invoice or paid order confirmation) and/or first use (commissioning) must be provided when making a product warranty claim.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND I THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE
PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESSED OR IMPLIED. THE COMPANY HEREBY SPECIFICALLY DISCLAIMS
ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the Company
shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of repairing or
replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, vandalism,
negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over which the
Company has no control. In addition, the Company shall not be responsible for any costs incidental to the Company’s warranty response efforts,
including, without limitation, costs associated with the removal and replacement of systems, structures or other parts of facilities, de-installation,
decontamination and re-installation of products, or transportation of products to and from the Company. This warranty shall be invalidated by any
abuse, misuse, misapplication, improper installation or improper maintenance or alteration of the product.
Some states do not allow limitations on how long an implied warranty lasts, and some states do not allow the exclusion or limitation of incidental or
consequential damages. Therefore the above limitations may not apply to you. This Limited Warranty gives you specific legal rights, and you may
have other rights that vary from State to State. You should consult applicable state laws to determine your rights. SO FAR AS IS CONSISTENT
WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL
SHIPMENT.
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