Additional Notes For Instruments With Ehedg And 3-A; Compliance With Ehedg Conformity; Mounting Instructions; Cleaning In Place (Cip) Cleaning Process - WIKA TR21-A Manual De Instrucciones

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
sealings have to 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.

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 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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VARINLINE sealings: e.g. GEA Tuchenhagen GmbH
®
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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 protection tube with minimal dead space
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and able to be cleaned easily.
The mounting position of the electrical thermometer including protection tube, 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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With the process connection via an instrumentation T-piece, the length L of the branch
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(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 substracted from the inner diameter of the branch D (rule: L ≤ D - d).

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.
For tank mounted sensors the tank cleaning devices shall be positioned in such a way
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that the sensor can be assessed and is perfectly cleaned.
WIKA operating instructions model TR21
EN
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