Hach K1200 Manuel D'utilisation Simplifié page 24

8.2.2 Sensor spot removal
1. Push the maintenance tool (square sides upmost) as far down as possible over the old sensor spot. Continue
to push down on the tool and turn gently until the square sides of the tool and the square slots of the sensor
spot engage. The tool should then drop into position.
2. Turn the tool counter-clockwise to unscrew the old sensor spot.
3. When unscrewed completely simply lift out the old sensor spot. Pull off the maintenance tool and discard the
old sensor spot.
Note: Check the O-ring. If it appears damaged in any way then using a pair of tweezers remove and replace it with the new O-ring
from the maintenance kit.
8.2.3 Sensor spot replacement
Avoid scratching or damaging the sensor spot (the black surface on the sensor head) during this process.
1. Push the maintenance tool (square sides upmost) as far down as possible over the new sensor spot.
Continue to push down on the tool and turn gently until the square sides of the tool and the square slots of the
sensor spot engage. The tool should then drop into position.
2. Make sure the sensor collar is as far down as it will go, so that the top of the collar is aligned with the base of
the sensor head.
3. Take the combined maintenance tool and sensor spot and place it in the end of the sensor.
4. Turn the tool clockwise to screw in the new sensor spot, finger tight. Do not over-tighten. Once secure, pull off
the maintenance tool.
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