Microsensor MPM489 Operation Manual page 10

c) Intrinsic safe version transmitter is used for explosive gas
environment, please connect transmitter with safe barrier to
establish intrinsic safe ex-proof system;
d) Safe barrier should comply with intrinsic safe ex-proof parameter,
and owning Ex-proof Qualified Certificate;
Safe barrier and power should be put in safe area; intrinsic safe
version transmitter should be put in dangerous area. Please see
Fig.5 and Fig.6:
Dangerous Area
P
P
Input
ExiaIICT6Ga
Transmitter ex-proof parameter:
U =28VDC I
i i
L =0mH C =0.042/0.055μF(ATEX)
i i
P =0.65/0.66W(ATEX)
i
ATEX(3-wire):
Dangerous Area
+V
OV
I
=93/115mADC(ATEX)
Safe Area
Safe
Barrier
Load
Fig. 5
Safe barrier ex-proof parameter:
U =28VDC
o
I =93/115mA DC (ATEX)
o
P =0.65/0.66W(ATEX)
o
8
+
Power
-
24VDC
[Exia]IIC
Safe Area