Sensor Spot Replacement - Hach ORBISPHERE 51 Series User Manual

Maintenance and Troubleshooting
3. When unscrewed completely simply lift out the old
4. Check the red O-ring (position indicated right). If it

15.2.3 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)
2. Make sure the sensor collar is as far down as it will
3. Take the combined maintenance tool and sensor
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sensor spot. Pull off the maintenance tool and
discard the old sensor spot.
appears damaged in any way, then using a pair of
tweezers, remove and replace it with the new
O-ring from the maintenance kit.
N O T I C E
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.
go, so that the top of the collar is aligned with the
base of the sensor head.
spot and place it in the end of the sensor.