TurbiTechw² LR Instruction Manual
5.2.1 Transmitter Module
The transmit module, positioned to the right of the flow cell, contains the solid-state emitter and the
light intensity control components. The light intensity is controlled automatically preventing signal
degradation with time. The light beam passes through the sample water. Light is scattered and
focused onto the target area. The transmitter contains precision optical components and must be
handled with care.
There is an O-ring seal on the face of the transmitter module. The light source module is retained
using a screw collar.
5.2.2 Receiver Module
The receive module fitted on the front of the flow cell is sealed and needs no routine service. The
module contains a photo-diode that receives the light from the solid-state light source. The output from
the receiver module passes to the microprocessor. The received signal is increased proportionally with
the turbidity level.
The receiver uses a combination of optical gain and electronic gain to view a very small area of the
flow cell. The receiver contains precision optical components and must be handled with care.
The receiver module may be removed from the flow cell by removing the cable from the interface and
the rubber grommets on the bracket. The module can then be unscrewed from the housing. There is
an O-ring seal on the face of the receiver module.
5.2.3 Cleaning Module
The cleaning module is located in the top of the measuring cell and locates with a screwed collar.
Access to the cell for manual cleaning is most readily obtained by removing the cleaning motor
assembly. The cleaning arm has a simple wiper blade attached to it. The module is controlled by the
7300w² Monitor. A location peg makes sure the module is correctly aligned during replacement.
Remove this cleaning module for access to the flow cell for cleaning and calibration. Ensure the O-ring
is still in place at the bottom of the cleaning module when replacing back into the flow cell.
5.3 Mounting & Installation
Whilst the TurbiTechw² Sensor is suitable for outdoor location we recommend that the 7300w² Monitor
is installed indoors or within an outer enclosure. Mount in a location free from excessive vibration.
5.3.1 Process Connections
Sample Inlet
½” BSP Female thread fitted with 12mm Hose-tail, material Polyamide. The inlet is fitted with a Nickel
plated brass ball valve.
Outlet
¼” BSP Female thread fitted with 8mm Hose-tail, material Polyamide. This should be free flowing to air
and not impose any siphoning effect on the system. The smaller outlet will naturally create a small
positive pressure within the flow cell and help minimise the effect of micro-bubbles on the reading.
Manual Drain
There is a manually operated drain tap at the bottom of the flow cell. This allows the cell to be emptied
prior to cleaning or calibration. Isolate the sample flow before draining the cell.
½” BSP Female with 12mm Hose-tail fitted, material Polyamide. The manual drain is fitted with a
Nickel plated brass ball valve.
5.3.2 Sample Flow Rate
The sample flow rate should ideally be in the region of 1 litre/minute. The minimum recommended flow
rate is 0.5 l/min, a lower flow rate will not cause any damage but will result in a slow system response
Page 12 of 34
225769IM - Issue - 05 Issue Date 30/04/2019
