Inline Turbidity Transmitter for Clean Water Applications

The TU8525 is a Turbidity Sensor with integrated electronics designed to output a 4-20mA signal proportional to the turbidity measurement. The TU8525 is designed for mounting inline into pipework or for mounting into a sample line from pipework.

The TU8525 uses an infrared light emitting source and a 90° photo-receptor to measure back scattering in accordance with ISO 7027 – EN 27027.

Manufactured in PVC with IP68 rating, the TU8525 is designed to be mounted directly into pipework or into a sample line such as our model TU910 inline probe holder.

4-20mA Inline Turbidity Transmitter

The TU8525 is a unique piece of equipment. It combines a nephelometric turbidity sensor, complete with integrated electronics, in order to provide an isolated 4-20mA output, proportional to the turbidity measurement.

The industry standard 4-20mA output signal is isolated into 600Ω and the instrument has been designed to give easy integration with a wide range of control equipment.  The 4-20mA signal is simple to connect to a PLC, digital Chart Recorder, universal controller or even our online Data Logger.

The 4-20mA output is loop powered, which means that the same two wires which carry the 4-20mA signal are also the same two wires which power the device.  This makes integration with PLC's and other control equipment incredibly straightforward.

Turbidity Transmitter with NTU Ranges

The TU8525 is designed for water quality analysis and is suitable for drinking water applications, raw water applications and water treatment applications. The ranges available with the TU8525 are as follows:-

Please note:- Nephelometric Turbidity Units shows as NTU

As a microprocessor driven device the TU8525 can communicate with a personal computer using a hyper-terminal client and serial interface. By accessing the device the ranges can be adjusted in the instrument software, allowing the same device to measure from as low as 0.001 NTU through to 400.0 NTU. We're also able to factory calibrate the measuring range of the instrument prior to it being despatched.

The TU8525 also offers a digital RS485 output which can be used to connect to a supported device.

Inline Turbidity Transmitter

The TU8525 is designed to be mounted either inline directly into pipework using a locking nut, or to be installed into a sample line cell. This is where a secondary line runs for the primary pipework, through the sample line flow cell, and then the sample discharges to drain.

Turbidity measurements in very clean water, such as drinking water, are susceptible to false positives from bubbles in the measured solution.  As bubbles are caused by water discharging to atmospheric pressure, flow cell TU910 includes a tightening tap to allow the sample flow cell to remain pressurised and prevent bubbles affecting the measurement.

When installed directly into pipework or the sample cell, the TU8525 in designed to operate to pressures up to 6 Bar.  In addition, using the infrared spectrum, the TU8525 is not affected by the colour of the measured solution within the pipework and should not be affected by bright light blinding the photoreceptor.

Inline Turbidity Transmitter Features & Benefits

The TU8525 is a genuinely unique instrument.  Designed to be permanently mounted into pipework or a sample line such as TU910 to give continuous turbidity readings and outputs a 4-20mA signal proportional to the turbidity measurement.

Designed to offer precision measurements even when measuring very low turbidities, the TU8525 can measure as low as 0.001 NTU or as high as 400.0 NTU in the same cell.  Using a personal computer hyper terminal, the serial interface allows the range to be changed from 0 4.000 NTU to 0 - 40.00 NTU or 0-400.0 NTU.

The PVC body and IP68 rating allow the cell to be permanently mounted into pipework and withstand a pressure of up to 6 Bar.  The isolated industry standard 4-20mA can interface with a wide range of PLC's and other control instruments and is easily connected using just 2 wires.

The turbidity measurements follow the standard nephelometric back scattering methodology (ISO 7027 - EN27027) and the infra-red light is not affected by the colour of the sample.