Watts HF scientific 28052 User manual

Catalog No. 29290
Rev 3 06/2020
OWNER’S AND USER’S MANUAL
MTOL+TM Turbidimeter
Models 28052 & 28053
HF scientific
16260 Airport Park Drive
Suite 140
Ft. Myers, FL 33913
Phone: [phone]
Fax: [phone]
Toll-free: 888-203-7248
E-Mail: [e-mail]
Website: HFscientific.com
Read Manual and all product labels BEFORE
using the equipment. Do not use unless you
know the safe and proper operation of this
equipment. Keep this Manual available for
easy access by all users. Replacement
Manuals are available at HFscientific.com

Catalog No. 29290
Rev 3 06/2020

Catalog No. 29290
Rev 3 06/2020
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)
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 Name MTOL+TM
Model No: Model #28052 (Infrared), Model #28053 (White Light)
I, the undersigned, hereby declare that the equipment specified above conforms to the
above Directives and Standards.
Place: Fort Myers, Florida USA
Date: 30 June, 2020
(Signature)
Diana Lefavi
Director of Water Quality

Catalog No. 29290
Rev 3 06/2020
Attention Owners and Users
Thank you for purchasing the MTOL+™ turbidimeter. This equipment will provide safe
and productive operation as long as it is installed, used, maintained, and serviced in
accordance with the instructions in this manual and is properly maintained. Importantly,
unless the user is adequately trained and supervised, there is a possibility of death,
serious personal injury, property damage or damage to the equipment.
Owners and users of this equipment bear the responsibility to make certain that this
equipment is used properly and safely. READ THIS MANUAL carefully, learn how to
use and service this equipment correctly, and strictly follow all of the instructions
contained in this manual and the requirements of local, state and federal law. Failure to
do so could result in death, serious personal injury, property damage or damage to the
equipment. This manual should be considered a permanent part of your machine and
should be kept available for easy reference by any user.
Owners should not permit anyone to touch this equipment unless they are over 18 years
of age, are adequately trained and supervised, and have read and understood this
manual. Owners should also ensure that no unauthorized personnel comes in contact
with this equipment.
If this equipment, or any of its parts, becomes damaged or needs repair, stop using the
equipment and contact an experienced service individual immediately. If the warning
labels or this manual are misplaced, damaged or illegible, or if you require additional
copies, please contact customer service at [phone] or 888-203-7248 for these
items at no charge.
Please remember that this manual and the warning labels do not replace the need to be
alert, to properly train and supervise users, and to use common sense when using this
equipment.
If you are ever uncertain about a particular task or the proper method of operating this
equipment, ask your supervisor, consult this manual, access www.hfscientific.com, or
contact us at 888-203-7248.
PRODUCT IDENTIFICATION
Please record your product’s identification and purchase information which will help in
the event you have questions or need any service.
Model:
Serial #:
Date of purchase:
Seller name/address:

Catalog No. 29290
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Catalog No. 29290
Rev 3 06/2020
Table of Contents
Section Page
Understanding Safety Information .......................................................1
Specifications........................................................................................2
1.0 Overview...............................................................................................3
1.1The MTOL+ .........................................................................3
1.2The Display ..........................................................................4
1.3The Touchpad ......................................................................4
1.4 Vapor Purge ........................................................................4
2.0 Unpacking and Inspection ....................................................................5
3.0 Installation ............................................................................................6
3.1 Site Selection .............................................................................7
3.2 Mounting ....................................................................................7
3.3 Plumbing & Assembly ............................................................10
3.3.1 Initial Assembly ...........................................................10
3.3.2 Connection of MTOL+ to System Plumbing ................10
3.3.3 Connecting the drain ...................................................12
3.3.4 Connecting the water intake ........................................12
3.4 Electrical Connections .............................................................14
3.4.1 Electrical Power Connection .......................................15
3.4.2 Terminal Block (P1) Connections .................................16
3.4.3 Closing the Junction Box .............................................18
4.0 Setup, Configuration and Calibration ...............................................19
4.1 Modes of Operation..................................................................19
4.2 Configuring the MTOL + ..........................................................22
4.2.1 Configuring the 4-20 mA Output ..................................22
4.2.2 Baud Rate .....................................................................24
4.2.3 Modbus Address ...........................................................24
4.2.4 Configuring the Alarms ..................................................25
4.2.4.1 Configuring Alarm 1.........................................26
4.2.4.2 Configuring Alarm 2.........................................27
4.2.5 Offset.............................................................................28
4.2.6 Access Code .................................................................28
4.2.7 Signal Averaging ...........................................................29
4.2.8 Display Resolution ........................................................30
4.2.9 LCD Brightness .............................................................31
4.2.10 Display Units .................................................................31
4.2.11 Ultrasonic Cleaning .......................................................31
4.2.12 Modbus Parity & Modbus Stop Bits ...............................32
4.2.13 4mA and 20mA Adjustment ..........................................33
4.2.14 Instrument ID.................................................................34
4.2.15 Logging Interval .............................................................34

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Table of Contents (continued)
Section Page
4.2.16 Download Logged Files ................................................35
4.2.17 Date and Time...............................................................35
4.2.18 Update Software ...........................................................38
4.3 Calibrating the MTOL+, CAL Mode ..........................................40
4.3.1 Calibration Standards ....................................................40
4.3.1.1 Alternate Ranges...............................................40
4.3.2 Indexing Calibration Cuvettes........................................41
4.3.3 Calibration Procedures ..................................................42
4.3.4 Abort Calibration ...........................................................43
4.3.5 Calibration Failure .........................................................43
4.3.6 Instrument Offset...........................................................44
5.0 Operation ...........................................................................................46
5.1 Replacing or Installing the Desiccant Pouch ............................46
5.2 Starting the System..................................................................47
5.3 Routine Measurement: AUTO mode ........................................48
5.4 Data Retrieval ..........................................................................48
5.4.1 USB Connection............................................................48
5.4.2 File Downloads .............................................................49
5.4.3 Modbus Communication................................................49
5.5 Patented Ultrasonic Cleaning...................................................50
5.6 Condensate on the Cuvette......................................................50
5.7 Cleaning the Flow through Cuvette ..........................................52
5.8 Replacing the Source Lamp .....................................................53
5.9 Factory Installed 24V Option ...................................................53
6.0 Troubleshooting ..................................................................................54
6.1 MTOL+ Fault Detection ............................................................54
6.1.1 Warnings ......................................................................54
6.1.2 Errors ............................................................................54
6.1.3 Failures .........................................................................54
6.2 Diagnostic Table .....................................................................55
6.3 Bubbles in the Sample ............................................................56
6.4 Technical and Customer Assistance .......................................56
7.0 Accessories and Replacement Parts List ...........................................57
8.0 Limited Warranty ................................................................................59

Catalog No. 29290 1
Rev 3 06/2020
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
MTOL+. 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.
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 alert you to
hazards.
•When you see this symbol alone or with a signal word on this instrument or in
this Manual, be alert to the potential for death or serious personal injury.
Safety signal words have the following meaning:
Identifies hazards which, if not avoided, will result in death or serious
injury.
Identifies hazards which, if not avoided, could result in death or
serious injury.
Identifie
s hazards which, if not avoided, will result in minor or
moderate injury.
Identifies practices, actions or failure to act which will result in
property damage or damage to the equipment.
Pictorials used on the equipment and in this Manual have the following
meanings:
This pictorial alerts you to the need to read the Manual.
This pictorial alerts you to electricity, electrocution and shock hazards.

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Specifications
Measurement Range 0 – 100 NTU, factory configured
Model #28052 (Infrared) & Model #28053 (White Light)
0-10 NTU & 0-1000 NTU optional ranges (loaded on USB thumb drive)
Accuracy ±2% of reading or ±0.02 NTU below 40 NTU whichever is greater (0-100 and
0-1000 ranges)
±5% of reading above 40 NTU (0-100 and 0-1000 NTU ranges)
±2% of reading or ±0.02 NTU (0-10 NTU range)
Resolution 0.0001 NTU (below 10 NTU)
Response Time
Adjustable
Display Multi-Line Liquid Crystal Backlit Display
Alarms
Two Programmable, 120-240VAC 2A Form C Relay
Analog Output
Powered 4-20 mA, 1000 Ωdrive
Communications Port
Bi-directional RS-485, Modbus RTU
Data Storage
16 Gigabytes download via USB flash drive
Software
Upgradeable via USB flash drive
Maximum Water Pressure Integral pressure regulator rated 7 bar (101.5 PSI)
Flow Rate 100 ml/min. – 1.5 liter/min. (.026-.40 Gal/min)
Operating Temperature
1°C – 50°C (34°F – 122°F)
Wetted Materials Nylon, Borosilicate Glass, Silicone, Polypropylene, Stainless Steel, Viton,
Acetyl
Sample Temperature 1°C – 50°C (34°F – 122°F)
Power Supply 100 – 240 VAC, 47 – 63 Hz, 80VA
Insulation Rating Double Insulated, Pollution Degree 2, Overvoltage Category II
Environmental Conditions Not recommended for outdoor use.
Altitude up to 2000 meters
Up to 95 % RH (non-condensing)
Enclosure
ABS
Regulatory Compliance
And Certifications
White Light Version compliant to U.S. EPA 180.1
Infrared Version compliant to ISO 7027 and DIN 27027
CE Approved, LC listed to UL 61010-1 3rd Edition: 2012
LC: Certified to CSA 22.2 No.61010-1-12: 2012
Instrument Weight
1.8 kg (4.0 lbs.)
Shipping Weight
2.8 kg (6.2 lbs.)
Limited Warranty 2 Years from date of invoice

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1.0 Overview
1.1 The MTOL+ - Product Description
The MTOL+ process turbidimeter allows for the measurement of the turbidity of
process water on-line. The MTOL+ works by nephelometry; which means it
measures reflected light at 90°incident to the light beam. The white light MTOL+
(Model #28053) has been designed to meet the design criteria specified by the
US EPA 180.1 on turbidity measurement. The infrared MTOL+ (Model #28052)
was designed to meet the design criteria specified in ISO 7027 and DIN 27027
for the measurement of the turbidity of a sample. Both models have long life
lamps.
All models have ultrasonic cleaning. Refer to section 5.5 for more information.
A pressure regulator on the incoming line is a standard on all MTOL+ instruments
and will reduce pressures up to 7 bar (101.5 PSI) down to 1.03 bar (15 PSI).
The MTOL+ instruments are fully equipped with isolated 4-20mA, Modbus, two
alarms and ultrasonic cleaning. The only option is a flow alarm which must be
factory installed.
Water Inlet
Display
Keypad
Junction Box
Shutoff Clamp
Drain
USB Slot
Backpressure valve

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1.2 The Display
Figure 1 illustrates all the items that can appear on the display.
•The upper row of the display is used for reporting the turbidity levels and to
provide user guidance in the customer setting routine.
•The lower row of the display is used to communicate error messages and
provide useful guidance.
•The display has two icons that are used to indicate the use of access code
and offset mode.
•In addition, mode arrows are used to indicate the current instrument
operating mode: AUTO (normal operation), CAL (calibration) and CONFIG
(configuration).
Figure 1 – Display used in the instrument.
All items used on the display are shown in this figure
1.3 The Touchpad
Figure 2 illustrates the touchpad. The touchpad has five buttons arranged in a
star pattern with a center button.
•Right and left buttons allow scrolling forward and backward through
the menus
•Up and down buttons are used to change selections
•The center button is used to accept a change.
Figure 2: Touchpad

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1.4 Vapor Purge
•The MTOL+ is equipped with a continuous Vapor Purge system.
•A replaceable desiccant pouch in the lower portion of the instrument dries the air.
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.
The MTOL+ monitors the replaceable desiccant pouch
condition continuously. The LCD display will show DESC on
the lower line in the event that the desiccant pouch needs replacement.
Replacement desiccant pouches are available from HF scientific or the
local representative (Part # 21555R). Refer to section 5.1 Replacing or
installing the Desiccant Pouch.
The MTOL+ creates its own internal environment. In this controlled environment,
condensation cannot form. The cuvette is essentially bathed in warm, dry air.
2.0 Unpacking and Inspection
The table below indicates the items in the turbidimeter shipment.
Item
Quantity
MTOL+ Turbidimeter with Flow Through Assembly 1
Field Terminal Box with Interconnect cable 1
Owner’s and User’s Manual 1
Desiccant Pack 1
Tubing Kit: 1-shutoff clamp
1-backpressure valve
2-connecting tubing with fittings for flow through assembly
1
Screwdriver to make electrical connections in the junction box 1
USB Flash Drive (Including files for optional ranges and user manual) 1
Remove the instrument from the packing carton. Carefully
inspect all items to ensure that no visible damage has
occurred during shipment. If the items received do not match the order,
please immediately contact the local distributor or the HF scientific
Customer Service department.

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3.0 Installation
The MTOL+ must be mounted and installed in a suitable location, plumbed to
the sample water source (section 3.34), and hard-wired to electrical power (section 3.4).
Installation MUST be performed by qualified technicians, including licensed electricians,
following all instructions, complying with all local, state, federal and other governmental
requirements, and with all building and construction codes and standards.
If you have any questions or are uncertain about proper site location, installation or
connection of the MTOL+, please contact customer service at HF scientific.
• Installation MUST be performed by qualified technicians, including licensed
electricians, following all instructions, complying with all local, state, federal and other
governmental requirements, and with all building and construction codes and standards.
• MTOL+ is electrically powered. ALWAYS take proper precautions to recognize,
evaluate, and control electrical hazards during installation, programming, use and
service/maintenance.
• Use ONLY with water free of corrosive chemicals or other hazardous substances.
• ALWAYS leak check plumbing connections following installation and on a regular
basis.
• MTOL+ MUST be installed in an area isolated from vibration, and not susceptible to
freezing or temperature extremes.Mount on any suitable vertical and flat surface that
can support the product’s weight.
• Keep installation and work area clean, well-lighted, free of clutter and distractions, and
accessible only by authorized personnel and workers.
• MTOL+ must be located in an accessible and well-lighted area for use, servicing,
repair or replacement by authorized personnel.

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3.1 Site Selection
Choose a site that is accessible and well-lighted for use,
servicing, repair or replacement by authorized personnel.
•MTOL+ should be located and mounted within 2-3 meters (6 to10 ft) of
the sampling point to ensure a quick response time.
•Installation/mounting site must be isolated from vibration, and not
susceptible to freezing or temperature extremes.
•The site must have a suitable vertical and flat surface that can support
the product’s weight and service operations 5kg (10lbs).
•There should be 20 cm (8 in) free area above the instrument. This will
ensure enough room for calibration and cuvette maintenance.
•The site must allow for mounting MTOL+ with the front display
positioned at eye level 1.4 to 2 meters (approximately 4.5 to 6.5 feet
from the floor).
•MTOL+ is designed to have the Junction Box cradled under the upper
portion of the instrument – Select a site with enough space for proper
configuration when mounted.
3.2 Mounting
Described is for installation to a concrete surface. If needed
contact HF scientific for instruction to install on other
surfaces.
Tools required:
Appropriate screwdriver or driver gun.
Mounting Template – last page of this Manual.
Masking tape for attaching Mounting Template to the wall.
Any tools required by wall anchor manufacturer if used.
Hardware required:
4 Mounting screws for instrument enclosure - M6 (¼”). Either use concrete
screws or use a wall anchors & the supplied screws.
2 Mounting screws for terminal junction box - M4 (#8). Either use concrete
screws or use a wall anchors & the supplied screws.

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1. Using masking tape, affix the mounting template to the vertical surface of
the selected mounting location and mark location for screws.
•The MTOL+ is designed for vertical wall mounting. If wall
mounting is not practical, the instrument can be mounted on any
suitable vertical, flat surface.
•Make sure that the mounting position is level.
2. The overall mounting dimensions of the MTOL+ are shown in Figure 3,
below. Measure to confirm that the mounting location has sufficient space
and that there is at least 20 cm (8 in) free area above the instrument when
mounted. This will ensure enough room for calibration and cuvette
maintenance.
3. Carefully remove the mounting template from the wall, keeping it in one
piece for future reference and use.
4. Install wall anchors (if needed) - Following manufacturer’s instructions for
the wall anchors, and using the mounting template as a guide, insert wall
anchors for each mounting position.
5. Mount the Junction Box First. The MTOL+ is designed to have the
Junction Box cradled under the upper portion of the instrument containing
the keypad and display.
a. Position the Junction Box of the MTOL+ to match the 2 lower wall
anchors.
b. Mount the Junction Box first by inserting the M4 (#8) screws
through the 2 inside the Junction Box. Use wall anchors as
needed.
Using the screwdriver, hand-tighten both screws, ensuring that the
Junction Box is firmly and securely attached.
6. Mount the upper keypad and display section. After securely mounting
the junction box, mount the upper portion of the MTOL+ so that the
junction box is cradled under the upper portion.
a. Position the upper portion of the MTOL+ to match the remaining
holes or wall anchors.
b. Insert M6 (1/4”) screws through the 4 tabs on the upper portion of
the MTOL+ and into the wall anchors.
c. Using the screwdriver or driver gun, to tighten the screws, ensuring
that the upper portion is firmly and securely attached.
7. Confirm that MTOL+ is securely mounted to the wall (or vertical surface)
and positioned:

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•Within 2-3 meters (6 to10 ft) of the sampling point to ensure a quick
response time.
•Isolated from vibration, and not susceptible to freezing or temperature
extremes.
•Suitable vertical and flat surface that can support the product’s weight
5 kg (10lbs).
•20 cm (8 in) free area above the instrument, allowing room for
calibration and cuvette maintenance.
•The front display should be positioned at eye level or a suitable level to
read and reach controls - approximately 1.4 Meters (4.5 feet) to 2
meters (6.5 feet) from the floor.
•Confirm that the unit is level.
Figure 3: Mounting Dimensions of the Instrument
Turbidity Sensor
Junction Box

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3.3 Plumbing & Assembly
ONLY qualified personnel should perform plumbing
connections following all instructions, complying with all
local, state, federal and other governmental requirements, and with all
building and construction codes and standards.
MTOL+ requires very little head pressure to operate 6.9kPa (1 PSI).
The flow-through cuvette is rated for a flow of 100ml/min. - 1 liter/min.
(0.026-0.26Gal/min).
The integral pressure regulator is rated for a MAXIMUM pressure of 7 bar
(101.5 PSI).
The MAXIMUM allowable fluid temperature is 50°C (122°F).
3.3.1 Initial Assembly
The IN and OUT tubes must be connected to the MTOL+ before the
system is connected to the sample water source and drain.
1. Identify the IN tube. This is the tube with the white ratcheting clamp.
2. Install the IN tube between the sensor mounting earmarked IN and the
flow head connection marked IN. Secure both ends tightly.
3. Identify the OUT tube. This is the tube with the rotary backpressure valve.
4. Install the OUT tube between the sensor mounting earmarked OUT and
the flow head connection marked OUT. Secure both ends tightly.
3.3.2 Connection of MTOL+ to System Plumbing
Requirements:
Use ¼ inch OD flexible tubing (polyethylene or polypropylene) for connecting
the MTOL+.
Use Opaque tubing if tubing may be exposed to sunlight. This
will help limit algae growth.
MTOL+ has push-to-connect fittings for water inlet and drain connections.

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WATER INLET TUBING
CONNECTION
Use ¼” OD tubing with supplied
push-to-connect fitting.
Polyethylene or polypropylene
are recommended tubing types.
BACKPRESSURE VALVE
This valve allows for an
adjustment to reduce bubble
formation. Turn clockwise to
increase backpressure.
SHUTOFF CLAMP
This clamp allows for shutting
off the intake flow during
cuvette maintenance. Press
down to restrict water flow.
DRAIN TUBING CONNECTION
Use ¼” OD tubing with supplied
push-to-connect fitting. Do not
reintroduce drain sample back
into the process stream
PRESSURE REGULATOR
The integral pressure regulator is
rated for a maximum pressure of 7
bar (101.5 PSI). The maximum
allowable fluid temperature is 50°C
(122°F).
Figure 4 Instrument parts identification
Flow Through Cuvette
The flow through cuvette is
rated for a flow of 100ml/min -
1liter/min. (0.026-0.26Gal/min).

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3.3.3 Connecting the drain:
a. MTOL+ drain tubing MUST be routed to a suitable
sanitary sewer drain. Wetted materials are not FDA approved.
DO NOT return the drain sample or any water run through MTOL+
into the process stream or into any potable water supply.
b. Select a length of ¼ inch OD flexible tubing (Polyethylene or
polypropylene) long enough to directly connect the MTOL+ drain
connection point to a suitable sanitary sewer drain. Avoid
unnecessary bends or sags in the tubing. Make sure there are no
kinks, twists, breaks, or damage of any kind in the tubing.
c. Using a sharp utility knife, cut the end of the tubing square.
Remove any burrs or sharp edges before inserting into fitting.
d. Place a piece of tape ½ inch from the end of the tube to indicate
how far the tube should be inserted.
e. Push the tube into the Quick-Connect fitting on the right facing side
of the MTOL+, as shown in Figure 4.
f. Check to confirm that tube is pushed fully against the tube stop.
Gently but firmly pull on the tube to check that it is secure.
g. Connect the other end of the tube to a suitable sanitary drain or
trench following proper plumbing techniques applicable to your
facility and configuration.
3.3.4 Connecting the water intake:
a. Use MTOL+ ONLY with water. Connect water intake
ONLY to water free of corrosive chemicals or other hazardous
substances.
HF scientific accepts no responsibility for damage caused
by the introduction of vapors, fluids or other materials into
the instrument process stream which is not compatible with the
instrument's wetted materials. A list of the wetted materials can be found in
the specifications on page 2 of this manual.
b. Select a length of ¼ inch OD flexible tubing (Polyethylene or
polypropylene) long enough to directly connect the MTOL+ water
inlet connection point to water sampling point. Avoid unnecessary
bends or sags in the tubing. Make sure there are no kinks, twists,
breaks, or damage of any kind in the tubing.

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c. Using a sharp utility knife, cut the end of the tubing square.
Remove any burrs or sharp edges before inserting into fitting.
d. Place a piece of tape ½ inch from the end of the tube to indicate
how far the tube should be inserted.
e. Push the tube into the Quick-Connect fitting on the left facing side
of the MTOL+, as shown in Figure 4.
f. Check to confirm that tube is pushed fully against the tube stop.
Gently but firmly pull on the tube to check that it is secure.
g. Connect the other end of the tube to the water sample source
following proper plumbing techniques applicable to your facility and
configuration.
After completing water inlet and drain connections, check all
tubing and connections for any leaks, weeping, breaks or
defects of any kind. Repair/replace as needed.