Hach-Lange LDO Sensor - Manual (Page 14)

D A N G E R
Explosion hazard. Do not connect or disconnect electrical components or circuits to the equipment
unless power has been switched off or the area is known to be non-hazardous.
D A N G E R
Explosion hazard. Substitution of components may impair suitability for Class 1, Division 2. Do not
replace any component unless power has been switched off and the area is known to be non-
hazardous.
N O T I C E
The hazardous location certified version of this product does not fulfill the requirements of the 94/9/EC Directive
(ATEX Directive).
Maintenance schedule
The maintenance schedule shows minimum intervals for regular maintenance tasks. Perform
maintenance tasks more frequently for applications that cause electrode fouling.
Note: Do not disassemble the probe for maintenance or cleaning.
Maintenance task Recommended minimum frequency
Clean the sensor 90 days
Inspect the sensor for damage 90 days
Calibrate the sensor As recommended by regulatory agencies
Clean the sensor
Clean the exterior of the sensor with a soft, wet cloth.
Note: If the sensor cap must be removed for cleaning, do not expose the interior of the cap to direct sunlight for
extended periods of time.
Set or change the clean interval
Application conditions may need shorter or longer durations between manual sensor cleanings. The
default clean interval is 0 days. To change the interval, refer to the steps in this procedure.
1. Go to MENU>SENSOR SETUP>[Select Sensor]>CONFIGURE>CLEAN INTRVL.
2. Change the shown value as needed. Confirm the change.
• To turn off the clean interval, set the value to '0'.
Change the sensor cap
W A R N I N G
Potential explosion hazard. The sensor setup cap is not rated for hazardous location use.
Replacement sensor caps and setup caps are shipped with installation instructions. Refer to the
included instructions to change the cap.
For best performance and accuracy, replace the sensor cap:
• Every two years
• When routine inspection shows significant erosion of the sensor cap
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