EN
24
WIKA operating instructions, models TRxx and TCxx
14150915.08 04/2024 EN/DE/FR/ES
5.6 Additional notes for instruments with EHEDG and 3-A
5.6.1 Compliance with 3-A conformity
For a 3-A marked connection with milk thread fittings per DIN 11851, suitable profile
seals must be used (e.g. SKS Komponenten BV or Kieselmann GmbH).
Note:
To maintain the 3-A certification, one of the 3-A approved process connections must be
used. These are marked with the logo in the data sheet.
5.6.2 Compliance with EHEDG conformity
For an EHEDG-compliant connection, seals in accordance with the current EHEDG
policy document must be used.
Manufacturer of seals
■
Seal for connections per DIN 32676 and BS 4825 part 3:
e.g. Combifit International B.V.
■
Seals for connections per DIN 11851: e.g. Kieselmann GmbH
■
VARINLINE
®
seals: e.g. GEA Tuchenhagen GmbH
5.6.3 Mounting instructions
Observe the following instructions, especially for EHEDG-certified and 3-A-compliant
instruments.
■
For compliance with the EHEDG certification, one of the EHEDG-recommended
process connections must be used. These are marked with the logo in the data sheet.
■
For compliance with 3-A conformity, a 3-A-compliant process connection must be
used. These are marked with the logo in the data sheet.
■
Mount the electrical thermometer, including the thermowell/protection tube, with minimal
dead space and able to be cleaned easily.
■
The mounting position of the electrical thermometers, including thermowell/
protection tube, welding 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.
■
With the process connection via an instrumentation T-piece, the length, L, of the branch
(connection to the measuring instrument) must not be longer than the inner diameter, D,
of the branch (rule: L ≤ D).
■
For protection tubes reaching into the branch, this diameter, d, shall be subtracted from
the inner diameter of the branch, D, (rule: L ≤ D - d).
5. Commissioning and operation
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