Functional safety manual –Series 8000 and Hydrobar
SM-EN-8000/09-2013/01 Page 2
1. Functional Safety
1.1 Scope
This safety manual applies to measuring systems consisting of Klay Instruments pressure transmitter in a
two wire 4-20 mA loop.
This functionally safety manual applies for:
Series 8000, 8000-SAN, CER-8000, 8000-SAN Cable, Hydrobar Cable and Hydrobar Cable-FR.
With a serial number of the transmitter > 10509426
1.2 Application area
The measuring system can be used for process pressure or level measurement of gases, vapours and liquids
which meet the specific requirements of the safety technology.
1.3 Safety function
The device generates an analogue output signal of 4-20 mA that is proportional to the current pressure.
This has to be controlled by a downstream logical unit (e.g. PLC). For the malfunction detection, the logical
unit has to distinguish between 4-20 mA-signals and the fault current < 3.3 mA or > 20.8 mA. Observe with
the conception of the system, that the technical data of the product-specific as well as Functional Safety
Data Sheet may not be exceeded. Especially the permissible operating condition (permissible temperatures,
etc.) have to be ensured.
Make sure that the entire interconnection of different components fulfills the requirements of the
application. The operator is responsible for correct construction of the overall system.
After installation a validation of the safety function is required.
The installation, maintenance and cleaning of the devices must be performed exclusively by persons
specifically trained and authorized for this purpose as far as they are familiar with the devices!
The operability of the measuring device should be checked via proof test in regularly intervals. For
defining the scope and interval of tests, the following table can be used as a reference. However
each application has its own unique properties and exceptions. Klay Instruments is not an expert in
the customer’s process (technical field) and does not accept liability for consequential damage of
any kind due to use or misuse of the Series 8000 and Hydrobar.
Chemical and Petrochemical
