Installation ________________________________________________________________________
Vaisala _________________________________________________________________________ 11
CHAPTER 3
INSTALLATION
General instructions
NOTE
Mounting the probe cable in gas
group IIC spaces
The following instructions shall be followed to fulfil the specifications
of the EN 50284 for non conductive layer of the probe cable:
•
Never mount or handle the probe cable when hazardous gases are
present
!
•
For achieving a conductive shield, cover the probe cable with
conductive material like metal or conductive tape or mount the
probe cable in a metal conduit
!
•
Assure that the conductive shield fulfils requirements of the
standard EN50284 (resistance less than 1 G
Ω
) and make sure that
it can not come loose in any operation situation
!
NOTE
During the installation work of the sensor heads in gas group IIC
areas (requiring category I devices), it has to be guaranteed that
even in fault cases sparks generated by impacts or friction on the
housing's surface can never occur.
Selecting a place for the transmitter
Select a place with stable conditions for mounting the transmitter. Do
not expose the transmitter to direct sunlight or rain. A rain shield for
HMT360 transmitter is available. When mounting the sensor head,
select a place representing the process conditions.
