TSK1 Installation and Operating Instructions
Page 8 of 27
7.1.4 Operation in hazardous areas
7.1.4.1 Without electrical equipment
The basic version of the flow meter is a non-electrical device
without its own ignition sources and meets DIN EN 13463-1
requirements. It can be used in hazardous areas that
require Category 2 equipment.
Reg. Nr.: BVS 03 ATEX H/B 112
Tech. File Ref. 03-02 X
Since the device does not have its own power sources that
would result in a temperature increase, the fluid temperature
is decisive for the maximum surface temperature.
When used in potentially explosive dust atmospheres, the
device must be cleaned regularly in order to avoid deposits
exceeding 5 mm.
7.1.4.2 With built-in electrical limit transducers
When the limit transducers are installed, the device becomes
an electrical assembly and receives a marking in accordance
with DIN EN 50014 from the entire device with the built-in
electrical limit transducers.
The electrical and thermal data and the special conditions of
the EC Type Examination Certificate of the built-in limit
transducers must be observed (see also the diagram in
Section 7.3.1).
The influence of the fluid temperature on the built-in limit
transducers must be observed. The overtemperature of the
maximum fluid temperature based on the maximum ambient
temperature must be considered with a factor of 0.25.
Example for built-in limit transducer:
Max. ambient temperature Tamb = 40°C
Max. fluid temperature Tm= 120°C
Factor for brought-in heat F = 0.25
Temperature class T4
Tü= Overtemperature
Ta= Ambient temperature of
limit transducer
CCCTambFTüTa
CCCTambTmTü
604025,0*80*
8040120
In accordance with the tables in the
PTB 99 ATEX 2219 X EC Type Examination Certificate, the
SJ 3,5-… N… inductive sensor must be operated in the
T5 temperature class with an intrinsically safe circuit that
does not exceed the maximum values of the Type 3 circuit.
When using the device in hazardous areas, follow the
applicable national installation rules.
Example for calculating the max. fluid temperature based on
the max. ambient temperature for the built-in sensor Type
ES.
Ta= 70°C
Tamb = 60°C
F = 0.25
CC
CC
Tamb
F
TambTa
Tm 10060
25,0 6070
7.1.4.2.1 Marking for the device when the
SJ 3,5…N… limit transducer is built in
PTB 99 ATEX 2219 X
II 2G Eex ia IIC T6-T4
7.1.4.2.2 Marking for the device when the
ES magneto-electric transmitter is built in
DMT 00 ATEX 075
II2G Eex ia IIC T6
7.1.4.2.3 Marking for the device when the
KINAX 3W2 angle-of-rotation transmitter is
built in
PTB 97 ATEX 2271
II 2G Eex ia IIC T6
7.1.4.3 Atmospheric conditions
In accordance with EN 1127, a “potentially explosive
atmosphere“ is defined as a mixture of air and combustible
gases, vapour, mist or dust under atmospheric conditions.
Such conditions are defined in EN 13463-1, para. 1, with
values Tatm = -20 °C to +60 °C and Patm = 0.8 to 1.1 bar.
Outside this range, safety parameters for most ignition
sources are not available.
Usually, paddle-type flow meters operate under operating
conditions outside the atmospheric conditions of 0.8 to
1.1 bar. Irrespective of the zone classification –safety
parameters of explosion protection –are basically not
applicable to the inside of the measuring tube. Therefore
operation with combustible products is only allowed if a
potentially explosive air mixture is not formed inside the flow
meter. Where this condition is not met, the operator will need
to assess the ignition hazard in each individual case and
give due consideration to existing parameters (e.g. pressure,
temperature, process product, materials of construction for
the measuring tube).
7.1.4.4 Ground connection
In paddle-type flow meters, it is possible under operating
conditions for charge separation to occur in the measuring
tube due to the transport of non-conductive fluids and/or
when the flow comes into contact with non-conductive
internals (e.g. liners, floats).
For that reason, variable-area flow meters must be
permanently grounded by the operator by way of the process
connections (flanges) in order to discharge electrostatic
build-up. The operator is also responsible for extending the
ground continuity of the process pipeline.
If grounding cannot be made via the process connections
(plastic process connections or undefined connections), the
flow meter must be connected to the local ground potential
via the flanges. This connection only ensures electrostatic
grounding of the device and does not meet the requirements
for equipotential bonding.
7.2 Ambient conditions
7.2.1 Ambient temperature ranges
Without electrical accessories: -40°C to +80°C
With limit transducer: -40 °C to +65°C
With KINAX signal output: -40°C to +60°C
With ES signal output: -40°C to +70°C
For the hazardous area version, take note of the maximum
ambient temperatures depending on the temperature class
as specified in the Type Examination Certificate.
