Mounting And Installation; Electrical Connection; Insulation Rating; Terminal Compartment - KROHNE H250/M10 Installation And Operating Instructions Manual

5

Mounting and installation

Mounting and installation is to be carried out acc. to EN 50281-1-2:1998 by specialist personnel trained in
explosion protection.
The information given in the standard Installation and Operating Instructions, the Supplementary
Installation and Operating Instructions and also in the EC Type Examination Certificate (see Attachment
A.1) must be observed without fail.
Verify that the H..../..../M10 with Cat. II3D variable-area flowmeter is suitable for the application in question
by comparing the details on the nameplate with those in Section 3.2 (Categories / Zone allocation),
Section 2 (Description code) and Section 4 (Marking).
When installing, please pay special attention to the following points.
5.1

Electrical connection

5.1.1

Insulation rating

The insulation of variable-area flowmeters H..../..../M10 - EEx is rated in conformity with
EN 61010-1:2001 and takes into account the following ratings:
• Overvoltage category for signalling and measurement circuits: II
• Insulation contamination level: 2
5.1.2

Terminal compartment

The electrical connection of the power supply and I/O functions is made in the integrated terminal
compartment of the signal converter.
5.1.3

Connecting cables

The connecting cables shall be selected in keeping with the valid installation standards and the max.
process temperature (see table section 3.8) . The outside diameter of the cable(s) must match the
cable clamping area for the cable entries.
5.1.4

Connection of power and I/O function

• Before connecting or disconnecting the electrical interconnecting cables of the device, make
sure that all cables leading to the signal converter are isolated from the ground (reference
potential) of the hazardous area. This also applies to safety conductors (PE) and
equipotential bonding conductors (PA)..
• All cores and shields of the connecting cables not safety-connected to the equipotential
bonding system for the hazardous area should be carefully insulated from each other and
from ground (test voltage 500V
Supplementary Installation and Operating Instructions M10 EEx d
for conductors of non-intrinsically safe cables).
rms
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