Hach-Lange POLYMETRON 9240 Operator Manual - Manual (Page 105)

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Section 9 Maintenance and Diagnostics
Periodic maintenance will ensure accurate and consistent analysis results. Verify the levels of
the calibration solution and reagents and refill where necessary.
9.1 Maintenance schedule
The following table shows the suggested maintenance schedule for the 9240 Sodium Analyzer.
9.2 Battery replacement
The transmitter is delivered with a CR1220 (3V) lithium battery included to safeguard the time
function in the instrument when not powered up. Should this internal battery malfunction or
require replacement it must be replaced with exactly the same battery type CR1220 (3V) UL
Certified (compulsory VARTA, RENATA or MATSUSHITA).
Table 10 Maintenance schedule
Daily Weekly Monthly
Every 3
Months Every 6
Months
Yearly
Every 2
Years
As
Needed
Verification X X X
Calibration X X
Electrode reactivation X X
Temperature calibration X X
Refill calibration solution X X
Refill reactivation solution X X
Refill electrolyte solution X X
Electrodes manual cleaning
(with paper/tissue)
X X
Conditioning solution
(non-cationic applications)
X X
Conditioning solution
(cationic applications) Refer to DIPA consumption on page 24 for an indication on
how often the conditioning solution will need to be changed.
X
Solenoid valves X X
The following items are performed by the Hach Lange service group
System check-up X
External audit X
WARNING
There is a risk of explosion if the replacement battery does not correspond to the correct
model as indicated above. Do not throw away used batteries, but send them to a local
recycling center.