2.5 Intrinsically safe installation
Control units type MEP3* and head amplifier units to type MEP3** and ***S*P*H** are approved by ATEX as intrinsically safe equipment to II 1 G Ex ia IIC. Refer to safety instruction IP221/SI and local code of practice.
The following points must be noted when installing these units:-
i)The cable from the head amplifier to the control unit must be screened, and the screen must be connected at the control unit end only.
ii)On I.S systems the cable from sensor to head amplifier must be less than 15 meters long. If more than 3 meter is required, special cable must be used.
iii)The control unit must be earthed using at least 4mm2 wire. All screen earth and main earth connections must be commoned. In the case of the rack unit, MEP3B, the chassis must be earthed and each unit connected independently to the chassis earth.
iv)I.S. cables must exit the control separately from the mains and relay cables.
v)It is the responsibility of the installer to ensure that local codes of practice are followed. Intrinsically Safe Electropulse is approved by ATEX & standards EN50014 and EN50020.
The certificates are listed below:
Description | Approval | To Standard |
Certificates of Conformity | Code |
|
MEP3 L | II (1) G [EExia] IIC | EN 50014 & EN 50020 |
MEP3 R/MEP3 B |
|
|
Sensor & Head Amplifier | II 1 G EExia IIC T4 | EN 50014 & EN 50020 |
Adjacent Amplifier | II 1 G EExia IIC T4 | EN 50014 & EN 50020 |
Sensors (separate) | II 1 G EExia IIC T4 | EN 50014 & EN 50020 |
|
|
|
Table 2.2 - Approvals
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