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MTOL+ Online Process Turbidimeter

MTOL+ Online Process Turbidimeter
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HF scientific has been successfully designing and manufacturing reliable, robust, accurate, low cost of ownership turbidity instrumentation for over 35 years. MTOL+ is the next generation of online turbidimeters from HF scientific. While this instrument shares components with the highly successful Micro TOL series instruments the MTOL+, has been completely electronically redesigned. This instrument employs a 32 bit ARM Core Processor and allows for data storage and software updates via a USB flash drive. Data logging of readings and the last four calibrations is built into the instrument. EPA 180.1 or ISO 7027 and DIN 27027 compliant models are available. HF scientific is a company that is easy to do business with and has customer service representatives ready to attend.

Fast and Easy Calibration

Primary calibration can be completed in less than 5 minutes.

Low Volume Sample Chamber

Reduces calibration costs and provides quick response times.

Long Lasting Light Source

Field replaceable if necessary.

Low Maintenance Fail Safe Design

Simple modular design. Easy to operate & service. No external controller needed.

Bubble Rejection System

Eliminates bubbles without delaying response time.


High quality with many features.

New Features

Data logging and storage of 1 year’s measurement and calibration data

Variable user-selectable logging interval from 1 to 60 minutes

Download data via USB

Software updates via USB

Isolated 4-20mA output standard

4-20mA and RS-485 Modbus outputs simultaneously

Ultrasonic cleaning standard

Range 0-100 NTU pre-calibrated
0-10 NTU and 0-1000 NTU calibration files included on USB key provided
Measurement principle Nephelometry (90°)
Accuracy 2% of reading or +/- 0.02 below 40 NTU (whichever is greater)
5% of reading above 40 NTU
Resolution 0.001 (below 10 NTU) User-Selectable
Response time Fast Response : Adjustable Averaging
Standard outputs 4-20mA isolated and RS-485
RS-485 protocols Modbus
User alarms 2 user-selectable high/low/system alarms C Form
Light source White Light (krypton gas filled) or Infrared (860nm LED)
Operating temperature 1°C-50°C (34°F - 122°F)
Input pressure 1-101psi (7 bar) (built in regulator set at 15psi)
Display Custom backlight LCD
Certifications USEPA, ISO 7027, CE Approved


Model Description
28052 MTOL+ instrument, infrared, 0-100 NTU
28053 MTOL+ instrument, white light, 0-100 NTU
28335 ProCheck-S low NTU value (typically less than 1 NTU) - for MicroTOL, Micro100/1000 - includes one ProCheck-S standard, log sheet, microfiber cloth, instruction sheet and is housed in a hard, protective case.
28336 ProCheck-S mid NTU value (typically around 7 NTU) - for MicroTOL, Micro100/1000 - includes one ProCheck-S standard, log sheet, microfiber cloth, instruction sheet and is housed in a hard, protective case.


Model Description
20779S Power Cord 120VAC
21555R Replacement Desiccant Pouch
39953 ProCal Calibration Kit .02,10, and 100NTU (for MicroTOL 3)
50121 Flow Through Assembly, high temperature, 0 - 90°C (32 - 194°F)

Service & Repairs

Please request a Return Material Authorization(RMA) number before sending an instrument in for repair.

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Where to Buy

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Disclaimer: HF scientific product specificatons are provided for reference only. HF scientific reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on HF scientific products previously or subsequently sold.