EN
14392029.02 08/2020 EN/DE
Operating instructions magnetostrictive level transmitter, models FLM-xAI, BLM-TAI (Ex)
27
The maximum temperatures for use in gas hazardous areas, depending on the
temperature class and the category or equipment protection level, are indicated in
temperature table 1:
Temperature table 1: Operating temperatures of the level transmitters
Temperature class
Ta
Tf
Category 1G or equipment protection level Ga (complete level transmitter installed in zone 0)
T6 (I
i
≤ 200 mA/100 mA)
-20 … +25 °C/+40 °C
T5 (I
i
≤ 200 mA/100 mA)
-20 … +40 °C/+55 °C
T4, T3, T2, T1
-20 … +60 °C
Category 1/2G or equipment protection level Ga/Gb (sensor head installed in zone 1,
sensor tube installed in zone 0)
T6 (I
i
≤ 200 mA/100 mA)
-40 … +25 °C/+40 °C
-20 … +60 °C
T5 (I
i
≤ 200 mA/100 mA)
-40 … +40 °C/+55 °C
T4, T3, T2, T1(I
i
≤ 200 mA/100 mA)
-40 ... +70 °C/+85 °C
Category 2G or equipment protection level Gb (complete level transmitter installed in zone 1)
T6 (I
i
≤ 200 mA/100 mA)
-40 … +25 °C/+40 °C
-40 ... +85 °C
T5 (I
i
≤ 200 mA/100 mA)
-40 … +40 °C/+55 °C
-40 ... +100 °C
T4 (I
i
≤ 200 mA/100 mA)
-40 ... +70 °C/+85 °C
-40 ... +135 °C
T3 (I
i
≤ 200 mA/100 mA)
-40 ... +200 °C
T2 (I
i
≤ 200 mA/100 mA)
-40 ... +300 °C
T1 (I
i
≤ 200 mA/100 mA)
-40 ... +450 °C
For use in category 1G or 1/2G the following applies:
The process pressure of the media must be between 0.8 bar and 1.1 bar in the presence
of explosive vapour/air mixtures. If no explosive mixtures are present, the instruments may
also be operated outside this range in accordance with the manufacturer's specifications.
Appropriate measures must be taken to ensure that the temperature (T
a
) of the respective
temperature class is not exceeded at any point of the sensor head.
General note (see also EN IEC 60079-0, section 1)
Zone 0 is only given under atmospheric conditions
Temperature range: -20 … +60 °C
Pressure range:
0.8 … 1.1 bar
Oxidising agents: Air (oxygen content approx. 21 %)
6. Safety-related characteristic values
