Additional Notes For Instruments With Ehedg And 3-A - WIKA TR21 Mode D'emploi

6. Additional notes for instruments with EHEDG and 3-A

6. Additional notes for instruments with EHEDG and 3-A
6.1 Compliance with the conformity in accordance with 3-A
For a 3-A compliant connection for milk thread fittings per DIN 11851, suitable profile
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sealings have to be used (e.g. SKS Komponenten BV or Kieselmann GmbH).
Note:
To maintain the 3-A certification, one of the 3A-approved process connections must be
used. These are marked with the logo in the data sheet.
6.2 Compliance with EHEDG conformity
For an EHEDG conform connection, sealings in accordance with the current EHEDG policy
document must be used.
Manufacturers of sealings
Sealings for connections per ISO 2852, DIN 32676 and BS 4825 part 3:
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e.g. Combifit International B.V.
Sealings for connections per DIN 11851: e.g. Kieselmann GmbH
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VARIVENT
®
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6.3 Mounting instructions
Observe the following instructions, especially for EHEDG certified and 3-A conform
instruments.
To maintain the EHEDG certification, one of the EHEDG-recommended process
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connections must be used. These are marked with the logo in the data sheet.
To maintain the conformity to the 3-A standard, a 3-A conform process connection must
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be used. These are marked with the logo in the data sheet.
Mount the electrical thermometer including thermowell with minimal dead space and
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able to be cleaned easily.
The mounting position of the electrical thermometer including thermowell, welding
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socket and instrumentation T-piece should be designed to be self-draining.
The mounting position must not form a draining point or cause a basin to be formed.
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6.4 Cleaning in place (CIP) cleaning process
Only use cleaning agents which are suitable for the seals used.
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Cleaning agents must not be abrasive nor corrosively attack the materials of the wetted
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parts.
Avoid thermal shocks or fast changes in the temperature. The temperature difference
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between the cleaning agent and rinsing with clear water should be as low as possible.
Negative example: Cleaning with 80 °C and rinsing at +4 °C with clear water.
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e.g. GEA Tuchenhagen GmbH
sealings:
WIKA operating instructions model TR21