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4
Safety
4.1 Safety measures by the design of the OMC-150 anemometer
The OMC-150 anemometer is a Category 2 G device, certified for use in potential explosive atmospheres
(gas explosion) in zone 1 and zone 2. The method of protection of the OMC-150 anemometer is intrinsic
safety (Ex-i) according to EN-60079-0 and EN-60079-11. A risk analysis was performed on the
mechanical construction of the instrument, both for operation during normal use and for anticipated faults,
according to EN13463-1.
4.2 System integration - interconnection to the other system components
As the OMC-150 anemometer is an intrinsic safe device, it should be connected through certified zener
barriers. All connections A through F are 'floating' with respect to earth. The three zener barriers must
comply to the following safety description, while used with both channels (A-B, C-D or E-F) interconnected
with no earth return:
Zener barriers on connections A-B and C-D:
Ui 20V, Ii 150mA, Pi 125 mW
Zener barriers on connections E-F:
Ui 16V, Ii 52mA, Pi 169 mW
The zener barriers limit the voltage with respect to earth.
Examples of suitable barriers are given in Table 2.
Manufacturer
2
MTL
Pepperl & Fuchs
4
CEAG
Stahl
Table 2 Applicable zener barriers
The OMC-158-2 interface unit does contain suitable barriers. No separate barriers are needed when the
OMC-158 -2 interface unit is applied.
Note that all components in the intrinsic safe loops of the OMC-150 anemometer must be suitable for use
in the designated zone.
2
MTL instruments , internet www.mtl-inst.com
3
The MTL 7742 is an active barrier which requires external power supply
4
CEAG Apparatenbau Hundsbach GmbH & Co. KG, internet www.ceag.de
Manual | OMC-150
Status: Final | Not confidential
Barrier Type for pins A-B
and C-D
7761Pac
Z961.H
SB-1761
9002/22-093-040-00
Barrier Type for pin E-F
Remarks
3
7742
SB-1351
Page 11 | 38
V2.13
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