Turbidity On-Line – Micro TOL


35 years of optical measurement expertise has allowed HF Scientific to become the leader in regulatory reporting turbidimeters. The HF MicroTol On-Line Turbidimeter has been specifically designed to meet regulations of the EPA and ISO 7027.

Features include fast and easy calibration, verification in seconds, low maintenance, fail safe design which ensures your instrument is always reading accurately, bubble rejection system, automatic continuous ultrasonic optical cleaning system (except MicroTOL 2 models), and a data acquisition software system that allows logging and data storage for multiple turbidimeters.

Standard Features:

  • Fast and Easy Calibration:Verification in seconds while a complete primary calibration can be completed in less than 5 minutes.
  • Low Volume Sample Chamber:Low volume sample chamber (30ml) reduces calibration costs and provides quick response times.
  • Low Maintenance Fail Safe Design:Simple Modular Design. Easy to Use and Service.
  • Bubble Rejection System:Eliminates Bubbles without delaying the response time.
  • Affordable:Modular microprocessor based technology ensures high quality at the industry’s lowest price.
  • Autoclean (except MicroTOL):Automatic Continuous Ultrasonic cleaning allows for the first EPA Accepted Automatic Cleaning OnLine Turbidimeter.

Optional Features:

  • Online Software: Allows logging, comparisons, graphs and data acquisition for multiple online turbidimeters into a PC
  • Remote Display: Allows remote monitoring up to 500 feet away


1 year
auto ranging 0 – 1000 NTU
Measurement Principle:
Nephelometry (90 degrees)
2% of reading or 0.015 below 40 NTU
5% of reading above 40 NTU
0.0001 Selectable
Response Time:
Adjustable (5 to 500 seconds)
0 to 1000 NTU
Standard Outputs:
4-20 ma Galvanic Isolated or RS-485
RS-485 Protocols:
Modbus, HF Simplebus, HF OnLine Interface
User Alarms:
2 User selectable high/low Alarms
Light Source:
White Light or Infrared (850nm LED)
Operating Temperature:
0-50 degrees C
Input Pressure:
1 – 200 psi (built in regulator set at 15psi)
Nema 4X, IP66
Multiline Custom LCD (backlight option)
USEPA, ISO 7027, CE Approved, ETL Listed to UL 3111-1 and ETL Certified to CSA 22.0 No. 1010-1-92

Delivery Content:

  • Fully calibrated infra-red or white light MicroTOL model of your choice
  • Includes 4 – 20 ma, backlight display
  • RS-485 ModBus
  • Inline pressure regulator
  • Dessicant
  • Universal power supply (100 – 240 VAC)
  • Quick start guide

MicroTOL online turbidimeter - Selectech

Additional information

Weight 0.00 kg