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7. Starting, operation
Welding Connections (only iWU-20, iWU-25)
The weld needs to be fully penetrating, but amperage and heat need to be minimised. We recommend flowing Argon gas
through the transducer during welding. This will help to cool the transducer. Prior to welding tubing to the transducer, it is
recommended that a few test welds be made.
WARNING!
■
Make sure the transducer is not connected to any other device, prior to arc welding.
■
Disconnect the transducer from any electrical device.
■
The operator is responsible for the material compatibility as well as correct handling, operation
and maintenance.
Prepare the transducer for use
1.
Adjust the zero point (please refer to chapter Zero Adjustment).
2.
Verify integrity of the weld or seal by appropriate helium leak-testing procedures.
3.
Turn the gas flow ON then OFF, 10 times to remove any particles generated during installation. (The flow rate used
should at least equal the process flow specifications.)
MSM, Modular Surface Mount (only iWU-26)
Please observe the corresponding technical specifications, such as torques and mounting position of the contact
components
Electrical connection
WARNING!
■
■
■
WARNING!
Specific conditions for safe use in explosive atmosphere
■
External grounding or equipotential bonding shall be established by end-user via pressure
connection.
■
The danger of ignition due to brush discharges must be avoided by mounting the apparatus in
areas without intensive electrostatic charging mechanism.
■
The circuits are limited to overvoltage Category III as defined in IEC 60664-1.
Standards applied for certification
IECEx BVS 18.0070 X
IEC 60079-0:2017
IEC 60079-11:2011
26
To connect only with certified intrinsically safe circuits with protection type "ia"
Cable and plug provided by end user shall be suitable for the ambient temperature..
Connect the enclosure to ground through the process connection, against electromagnetic
fields and electrostatic discharge
BVS 18 ATEX E 082 X
IEC 60079-0:2017
(also complies with: EN 60079-0:2012 +A11:2013)
EN 60079-11:2012
WIKA Operating instructions iWU-2x
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