Hach-Lange NH4D sc Ammonium Sensor - Manual (Page 41)

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Section 9 Warranty and Liability
The manufacturer warrants that the product supplied is free of
material and manufacturing defects and undertakes the obligation
to repair or replace any defective parts at zero cost.
The warranty period for instruments is 24 months. If a service
contract is concluded within the first 6 months of purchase, the
warranty period is extended to 60 months.
With the exclusion of further claims, the supplier is liable for defects
including the lack of assured properties as follows: All those parts
that, within the warranty period calculated from the day of the
transfer of risk, can be demonstrated to have become unusable or
that can only be used with significant limitations due to a situation
present prior to the transfer of risk, in particular due to incorrect
design, poor materials or inadequate finish will be improved or
replaced, at the supplier's discretion. The identification of such
defects must be notified to the supplier in writing without delay,
however at the latest seven days after the identification of the fault.
If the customer fails to notify the supplier, the product is considered
approved despite the defect. Further liability for any direct or
indirect damages is not accepted.
If instrument-specific maintenance and servicing work defined by
the supplier is to be performed within the warranty period by the
customer (maintenance) or by the supplier (servicing) and these
requirements are not carried out, claims for damages due to the
failure to comply with the requirements are rendered void.
Any further claims, in particular claims for consequential damages,
cannot be made.
Consumables and damage caused by improper handling, unsafe
assembly or by incorrect use are excluded from this provision.
Process instruments of the manufacturer are of proven reliability in
many applications and are therefore often used in automatic control
loops to provide the most economical operation possible for the
related process.
To avoid or limit consequential damage, it is therefore
recommended to design the control loop such that a malfunction in
an instrument results in an automatic changeover to the backup
control system, which is the most secure operating condition for the
environment and for the process.