WIKA TR25 (Ex i), Operating Instructions Manual

Page: 25 / 128

EN
14073045.06 10/2020 EN/DE/FR/ES
WIKA operating instructions model TR25 (Ex i) 25
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:
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
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
connections must be used.
■
To maintain the conformity to the 3-A standard, a 3-A-compliant process connection
must be used.
■
Mount the electrical thermometer, including the thermowell, with minimal dead space
and able to be cleaned easily.
■
Installation 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.
7.4 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 cold water.