Additional Notes For Instruments With Ehedg And 3-A; Compliance With 3-A Conformity; Compliance With Ehedg Conformity; Mounting Instructions - WIKA TR25 Betriebsanleitung

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

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

7.1 Compliance with 3-A conformity

For a 3-A-compliant connection with milk thread fittings per DIN 11851, suitable profile
sealings must be used (e.g. SKS Komponenten BV or Kieselmann GmbH).

7.2 Compliance with EHEDG conformity

For an EHEDG-compliant connection, sealings in accordance with the current EHEDG
policy document must be used.
Manufacturer 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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Neumo BioConnect
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7.3 Mounting instructions

Observe the following instructions, especially for EHEDG certified and 3-A-compliant
instruments.
To maintain the EHEDG certification, one of the EHEDG-recommended process
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connections must be used.
To maintain the conformity to the 3-A standard, a 3-A-compliant process connection
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must be used.
Mount the electrical thermometer, including the thermowell, with minimal dead space
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and able to be cleaned easily.
Installation position of the electrical thermometer including thermowell should be
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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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7.4 Cleaning in place (CIP) cleaning process

When cleaning from outside ("wash down"), observe the permissible temperature and
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ingress protection.
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 cold water.
WIKA operating instructions model TR25 (Ex i)
sealings: e.g. Neumo GmbH & Co. KG
®
EN
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