Vaisala HMT360 - Manual (Page 21)

Chapter 3 _______________________________________________________________ Installation
VAISALA_______________________________________________________________________ 19
CHAPTER 3
INSTALLATION
This chapter provides you with information that is intended to help you
install this product.
General Installation Instructions
Mounting the Probe Cable in Gas Group
IIC Spaces
NOTE The following applies only to installation within the EU!
The following instructions shall be followed to fulfil the specifications of
the EN50284 for nonconductive 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 GΩ) and make sure that it can not come
loose in any operation situation.
WARNING During the installation work of the probes 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 surface of the housing
can never occur.