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Section 15 Maintenance and Troubleshooting
15.1 Instrument maintenance
15.2 K1200 sensor maintenance
The sensor spot needs to be replaced about once a year The procedure is very simple and
takes no more than a couple of minutes. Based on the measurement range of oxygen, the
sensor lifetime can be shorter and the maintenance—and calibration—frequency increased. If
there are bleaching compounds and strong oxidants (e.g., ClO2) in the sample, the sensor
lifetime can also be shorter.
Important Note: The shelf-life of the K1200 LDO spot is 2 years prior to first use.
15.2.1 Equipment required
15.2.2 Sensor spot removal
CAUTION
Personal Injury Hazard. Any instrument maintenance should be carried out by a qualified
Hach Service Technician. Please contact your local representative should you feel any
maintenance or instrument adjustments are required
A replacement sensor spot (No. 1) and O-ring
(No. 3) supplied with the sensor spot.
The maintenance tool (No. 2) which is
delivered with the sensor.
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.
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