Turbidity is the measure of relative clarity of the water. It is considered as the simplest and basic indicator of the amount of suspended sediment in the water. High turbidity can be caused organic materials such as algae, and inorganic materials such as silt and sediment.
Inline turbidity meter is designed to be permanently mounted into pipework to give continuous turbidity readings and transmit a 4-20mA signal, proportional to the turbidity measurement.
- Well water monitoring
- Monitoring of membranes for filtration or reverse osmosis
- Wastewater control in outlet of WWTP
- Cooling plant monitoring
- Filter monitoring
Turbidity is commonly measured using the nephelometric method, which measures the amount of light scattered at right angles to an incident light beam by particles present in a sample. Measured values are usually indicated in Nephelometric Turbidity Unit (NTU) and the Formazin Nephelometric Unit (FNU).
Both the Nephelometric Turbidity Unit (NTU) and the Formazin Nephelometric Unit (FNU) scales measure turbidity by the scattered light method. Both units calibrate the intensity of scattered light at 90 ° from an incident beam of light. However, you derive NTU measurements from a beam of white light, in line with US EPA 180.1, whereas FNU measures turbidity with an infrared light source, as required by ISO 7027, the European drinking water protocol.
The inline turbidity transmitters by BAMO are calibrated to European standard ISO 7027. The ISO 7027 is one of the most well-known guidelines and is internationally recognized when verifying turbidity meter and turbidity sensor performance and method compliance. The ISO 7027 standards rely on nephelometric technology that uses an infrared monochromatic light source.
The inline measuring cell at the sensor set makes use of two IR transmitters and one IR receiver in pulsating light mode. Theere are 3 optical windows with designed with Cleanosil anti-fouling coating to prevent dirt from sticking on the surface. It has a longer life span compared to mechanical wiper or wiping system.
Inline turbidity transmitters are permenantly installed on pipelines which requires minimal maintenance. It also provides continuos measurement of large flowing liquid, across a very wide range of turbidity measurements.
The sensor set can be connected to a PLC or remote monitoring / control device (optional) to analyses the 4 to 20 mA signal generated by the sensor set.
- The fixture must be installed vertically.
- Best installation is the mounting in an ascending tube with slow down section 600 mm in front and 400 mm behind the turbidity-measuring device.
- The sensor fixture must be completely filled with liquid during the performance of measurements.
- Install to the vertical portion of a siphon trap if necessary.
- Air bubbles distort measurement results.
- Optical windows must be clean, clean them at regular intervals as required.
- Plain cell in stainless steel
- 90 ° scattered light measurement and 180 ° transmitted light measurement
- Measuring cell: AISI 316 L
- Measuring ranges:
0.01 … 20 FNU
0.1 … 500 FNU & 100 … 1000 FAU - Output signal: 4-20 mA (4-wire)
- Process connections: DIN flanges or Tri-clamp
- Mounting: Installation only in vertical piping and rising flow range of connection variants
- Plain cell in PVC and PPH
- 90° scattered light measurement and 180° attenuated light measurement
- Smooth cell surfaces – no settling of particles
- Measurement ranges:
… 20 FNU
… 500 FNU & 100 … 1000 FAU - Output signal: 4-20 mA
- Process connections: Flanges or unions
- Mounting: Only for vertical fully loaded pipe, with ascending flow
