Identification And Labeling Of Immersion Sleeves In Existing Systems; Legal Background; Identification Of The Thermowell In The Field; Identification Of The Immersion Sleeves - Xylem Sensus PolluCom F/S C Installation And Operating Instructions Manual

PolluCom ® F/S C Heat/Cooling Meter
Installation and Operating Instructions

13. Identification and labeling of immersion sleeves in existing systems

13.1 Legal background

For the new installation of heat meters with a type approval in accordance with the European Measuring
Instruments Directive (MID) up to nominal size q
temperature sensors may only be installed directly. For existing installations, the use of temperature
sensors in thermowells is tolerated until 10/30/2026 when replacing meters in accordance with PTB
communication issue 4-2009 "Use of MID-compliant temperature sensors for heat meters in existing
thermowells" under the following conditions:
The suitability of the temperature sensors in combination with the corresponding design of the

immersion sleeve of the field inventory has been proven to the Physikalisch-Technische
Bundesanstalt (PTB) to ensure compliance with the error limit for the measurement.
The thermowell used must be clearly assignable to one of the type codes assigned by PTB.

The immersion sleeve must be identified in the field.

The immersion sleeve must be clearly marked.


13.2 Identification of the thermowell in the field

A stock list (toleration list) filed at PTB describes the immersion sleeves that are eligible for stock use
with MID-marked probes. In this list, unique characteristics of the thermowells are defined to clearly
identify the thermowells in the field.
Measuring device users or the fitters commissioned by them may only use MID-marked temperature
sensors in conjunction with existing thermowells if these have been positively identified for the type of
thermowell recognized as suitable.
The thermowell must be subsequently provided with a clear marking at the installation location and with
a user protection for the temperature sensors. The marking must contain at least one key according to
the PTB inventory list (e.g. "TH xxx") which determines the type of thermowell.
The following features of the installation location must be identified and logged:
• Design / significant feature (e.g. M10 female thread, recirculating groove, cross screw, etc.)
Identifiable identification (e.g. manufacturer identification, etc.)
•
Internal diameter (di)
•
Insertion length of the sensor
•
Connection thread dimension
•
• Wrench size
• Height of the hexagon
• Material (e.g. brass, brass tinned, etc.)

13.3 Identification of the immersion sleeves

Two seals are included in the accessory kit for marking the thermowells.
After identification, the toleration mark (PTB TH No.:..) can be taken from the following table and applied
to the plates with a document-proof pen. Then attach the seals to the thermowells as user protection.
To do this, press the cap firmly together.
Style 1
6 m³, the German calibration law stipulates that the
p
Type of seal depending on package leaflet:
Style 2 Style 3
M H 1500 INT, Page 17