TurbiTechw² LR Instruction Manual
10 Maintenance
10.1 General cleaning
Automatic cleaning is controlled by the 7300w² Monitor. A mechanical wiper operates at a pre-set time
interval, user configurable by the 7300w² Monitor. This wiper can be set to operate every few hours if
conditions demand but is usually set to 6 hourly.
Monthly, or as required, check the measurement cell for fouling. The sensor chamber is easily
accessed, by removing the cleaning motor assembly. The two optical windows are then visible, as is
the cleaning wiper mechanism. Use a soft lint free cloth to wipe the windows. The windows should
have been kept clean by the automatic cleaning cycle. Check the body of the cell for debris or
biological fouling and clean as required.
10.2 Inspection
The flow cell will need periodic cleaning, depending on the characteristics of the media being
monitored. This would normally be carried out at the same time as calibration.
The sample flowing into the instrument should be representative of the flow to be measured. The flow
should be between 0.5 and 5 litres per minute.
Make a routine check of any cable connections or terminations.
From time to time the cleaning blade will need replacement; this would typically be once every 2 years.
This operation requires no special tools or training and can be carried out in a few minutes. Wiper
blades slide into the stainless steel wiper arms and can be replaced when worn. The ends of the wiper
arm should be pressed together gently to grip the blades after fitting.
10.3 Dismantling the Sensor
10.3.1 Removing the Modules
It should not be necessary under normal operating conditions to remove the transmitter & receive
modules as this will invalidate any stored calibration values.
In certain circumstances it may be required to replace both modules as a transmit/receive pair as
supplied by Partech. However a preferable route would be to return the complete flow cell to Partech
for servicing.
The cleaning module is located at the top of the flow cell. To remove, unscrew relevant wires from the
terminal block within the interface enclosure and pull cable back through the enclosure cable gland
and rubber grommet mounted on the chassis. Unscrew the knurled collar to withdraw the module.
Page 26 of 34
225769IM - Issue - 05 Issue Date 30/04/2019
