Hach-Lange FP 360 sc User Manual - Manual (Page 23)

23
Section 5 Maintenance
The inside of the sensor is maintenance-free.
The cleanliness of the measurement window in the sensor head has an impact on the
accuracy of measurements. Check the measurement window at regular intervals to make
sure it is clean. The required frequency of these checks is dependent on the measuring
medium. Also do a check in the event of unusually high measurement values and clean
the measurement window if necessary (refer to section
5.3 on page 24 ).
For sensors with a cleaning unit, adjust the frequency of cleaning to the measurement
conditions. The inspection interval must be shortened to reflect any increase in solid
matter.
5.1 Maintenance schedule
Contact the manufacturer's service department every 2 years to arrange sensor
inspection, testing, calibration and seal replacement. The flash bulb is also replaced every
4 years.
5.2 Maintenance for the connectors on the sensor
The 8-pin connector on the sensor is designed for constant usage under water. The
connector is lubricated with high-performance grease at the factory and does not require
any additional maintenance from the recommended sensor inspection cycles.
To maintain the performance of the connectors:
• Protect the neoprene components of the connector against high temperatures and
intense solar radiation. If this cannot be avoided, moisten the dried out neoprene
components with clean, clear water. Subsequently, loosen the connector.
• The pins must always be lightly lubricated. Only apply a very thin film of lubricant.
Recommended lubricants are Loctite
8021 as a spray or Molykote 44 Medium. 
The lubricant must not come into contact with the measurement window.
• Rinse out grains of sand and solid matter from the cable socket.
• To loosen the connector, unscrew the safety sleeve and pull out the plug longitudinally.
• Avoid flexing the plug and pulling on the cable.
• Do not loosen the connector at ambient temperatures below 0 °C. Heat the neoprene
components carefully to temperatures above 0 °C and then loosen the connector.
• Avoid kinks or tight bend in the cables.
N O T I C E
Individual components of the suspension device (shackle and chain of the chain mount kit) are
made of stainless steel and may corrode.
Interval Maintenance task 1
Visual inspection
Application-dependent Check for contamination and corrosion.
System inspection Every 2 years Check plugs and flash bulb.
Calibration check Every 2 years Check calibration
1 When operated according to factory settings and appropriate use