EN
14073045.04 03/2019 EN/DE
WIKA operating instructions model TR25 (Ex i)
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8. Additional notes for instruments with EHEDG and 3-A
8.1 Compliance with the conformity in accordance with 3-A
For a 3-A compliant connection for milk thread fittings per DIN 11851, suitable profile
sealings have to be used (e.g. SKS Komponenten BV or Kieselmann GmbH).
8.2 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:
e.g. Combifit International B.V.
■
Sealings for connections per DIN 11851: e.g. Kieselmann GmbH
■
Neumo BioConnect
®
sealings: e
.g. Neumo GmbH & Co. KG
8.3 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
connections must be used.
■
To maintain the conformity to the 3-A standard, a 3-A conform process connection must
be used.
■
Mount the electrical thermometer including thermowell with minimal dead space and
able to be cleaned easily.
■
The mounting position of the electrical thermometer including thermowell should be
designed to be self-draining.
■
The mounting position must not form a draining point or cause a basin to be formed.
8.4 Cleaning in place (CIP) cleaning process
■
When cleaning from outside (“wash down”), observe the permissible temperature and
ingress protection.
■
Only use cleaning agents which are suitable for the seals used.
■
Cleaning agents must not be abrasive nor corrosively attack the materials of the wetted
parts.
■
Avoid thermal shocks or fast changes in the temperature. The temperature difference
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.
8. Additional notes for instruments with EHEDG and 3-A
