Heinrichs Messtechnik GmbH
Page 10 of 20
EX-Supplementary Operating Manual
HPC Mass Flow Meter
4.3.3.1
Pin assignment of the Sensor cable
Pin Designation
Terminal / Pin designation
Type of protection
Ex ia
Sensor lines
Pick-Up coil 1 +
1
x
Pick-Up coil 1 -
2
x
Pick-Up coil 2 +
3
x
Pick-Up coil 2 -
4
x
TIk-
5
x
Temperature sensor -
6
x
Temperature
7
x
TIk+
8
x
EXCITER Coil
9
x
EXCITER Coil
10
x
Shield
Shield
x
Note: Sensor and transmitter are always mounted separately.
4.3.3.2
Cable Parameters
The operator is to comply in all cases with the applicable installation regulations of the corresponding region
or country such as EN 60079-14 “Electrical apparatus for explosive gas atmospheres- Part 14: Electrical
installations in hazardous areas” for Europe, Section 18 of the Canadian Electrical Code for Canada or Article
NEC 504 and / or NEC 505 for the United States.
Applicable guidelines pertaining to the interconnection of intrinsically safe circuits must also be observed.
The following maximum cable parameters must be abided to:
C
L
= 100 pF/m wire to wire
C
L
= 170 pF/m wire to shield
L
L
= 700 µH/km wire to wire
L
L
= 500 µH/km wire to shield
Warning
If a connecting cable other than the Heinrichs Messtechnik cable is used, a comprehensive
assessment is required to ensure it fulfils all the requirements of the applied protection classes
and the area of installation
4.3.3.3
Equipotential bonding
Equipotential bonding between the sensor and transmitter is essential and must be established and
maintained. Connection points are provided on the outside of the sensor and transmitter for this
purpose.
