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Assembly Instructions
5.4.13 Gas Meter (Turbine): Encoder Index, 2 LF/HF Sensors
(EEx i) via ExMFE5 Boards
Hazardous Area
1234567,8
Turbine:
encoder and
2 LF/HF sensors
encoder index, 2 LF/HF sensors (EEx i) via ExMFE5
Characteristics:
•
three intrinsically safe, galvanically isolated input safe circuits of the
category [Ex ib Gb] II C for HF- or LF pulse sensor according to
NAMUR;
active isolated pulse amplifier integrated in the inputs as
"associated electrical equipment" according to EN50020
•
alternatively, one encoder index can be connected with NAMUR
interface on channel 1.
•
maximum input frequency depending on the operating mode:
−
LF:
−
HF:
Page 64 of 97
Safe Area
Fig. 5-18: Interface for turbine meter
Operating Instructions
enCore device
ExMFE5 board
Z1+
Z1−
Z2+
Z2−
Z3+
Z3−
SH
8 Hz with low-pass filter
5 kHz
enCore FC1
5
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