Temperature sector

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| Temperature

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Sector Manager (Temperature): Pasqualino Gramazio

Sector Manager (Pyrometry): Fabio Rinaldi

Campus Bovisa

Via Lambruschini, 4a

20156 - Milano

Telephone: 02.2399.9253/9239

Mail: taratura@polimi.it

The sector performs calibration by comparing the main temperature meters. In particular, calibration is applied to thermocouples, resistance thermometers, liquid glass thermometers and thermometric chains with indicators and transmitters combined with thermocouples/resistance thermometers.

THERMOCOUPLES

Instruments in calibration

Measuring

Condition

Measuring range

Uncertainty

Method/Procedure

Noble metal thermocouples

Temperature

Con/senza cavi di estensone o compensazione1

Temperatura del giunto di riferimento realizzata in bagno di ghiaccio fondente

≥ 50 °C

< 0 °C

0,5 °C

 Internal method. Calibration by direct comparison with sample temperature

≥ 0 °C

≤ + 550 °C

0,4 °C

≥ 550 °C

≤ 1.100 °C

1,5 °C

Base metal thermocouples

≥ -80 °C

≤ + 250 °C

0,5 °C

≥ 250 °C 

≤ + 550 °C

0,52 °C

≥ 550 °C 

≤ 1.100 °C

1,6 °C
  1. In caso di taratura di termocoppie prive di cavi di estensione/compensazione propri, il Laboratorio impiegherà le proprie dotazioni di cavi di estensione/compensazione connesse al giunto di riferimento. Ciò comporterà un ulteriore contributo di incertezza oltre il valore già indicato nella colonna “Incertezza”.

Certificate delivery time: 20 working days from the execution of the measurements

RESISTANCE THERMOMETERS

Instruments in calibration

Measuring

Condition

Measuring range

Uncertainty

Method/Procedure

Resistance thermometers

Temperature

n.a.

≥ -80 °C

≤ +250 °C

0,05 °C

 Internal method. Calibration by direct comparison with sample temperature

≥ 250 °C

≤ 600 °C

0,1 °C

Certificate delivery time: 20 working days from the execution of the measurements

THERMOMETRIC CHAINS (indicators and transmitters)

Instruments in calibration

Measuring

Condition

Measuring range

Uncertainty1

Method/Procedure

U1

U2

Thermometric chains (temperature indicators and transmitters) with noble metal thermocouples

Temperature

n.a.

≥ -50 °C

< 0 °C

0,25 °C

Uris

Internal method. Calibration by direct comparison with sample temperature
 

≥ 0 °C

≤ +550 °C

0,20 °C

Uris

> 550 °C

≤ 1.100 °C

0,60 °C

Uris

Thermometric chains (temperature indicators and transmitters) with base metal thermocouples

n.a.

≥ -80 °C

≤ +250 °C

0,25 °C

Uris

> 250 °C

≤ 550 °C

0,26 °C

Uris

> 550 °C

≤ 1.100 °C

0,80 °C

Uris

Thermometric chains (temperature indicators and transmitters) with resistance thermometers

n.a.

≥ -80 °C

≤ +250 °C

0,025 °C

Uris

> 250 °C

≤ 600 °C 

0,05 °C

Uris

Indicatori e trasmettitori di temperatura con termistori

n.a.

≥ -50 °C

< +90 °C

0,025 °C

Uris

≥ 90 °C

≤ 200 °C 

0,05 °C

Uris
  1. The measurement uncertainty value is obtained by adding in quadrature the indicated values of the two components (2 √ (〖"U" _ "1"〗 ^ "2" "+" 〖"U" _ "2"〗 ^ " 2 "), where uris indicates the standard uncertainty due to the resolution of the instrument being calibrated, expressed in °C.

Certificate delivery time: 20 working days from the execution of the measurements

TERMOTHERMOMETRIC CHAINS INSTALLED IN INDUSTRIAL STEAM GENERATORS

Instruments in calibration

Measuring

Condition

Measuring range

Uncertainty1

Method/Procedure

U1

U2

Thermometric chains

Temperature

Installation in industrial steam generators

≥ 650 °C

≤ 1.100°C

1,5 °C

Uamb

Internal method. Calibration by direct comparison with sample temperature

1) The measurement uncertainty value is obtained by adding in quadrature the indicated values of the two components (2√ (〖"U" _ "1"〗 ^ "2" "+" 〖"U" _ "2"〗 ^ "2 "), where uAamb (expressed in °C) indicates the standard uncertainty of the uncertainty contributions due to repeatability, to the positioning of the pyrometer with respect to the chain being calibrated, to the temperature gradient inside the post-combustion chamber, to the room temperature, and to the combined effects of convection and radiation.

Certificate delivery time: 20 working days from the execution of the measurements

1) For thermometric chains, in the case of indicators with several thermoelements, for each thermoelement subsequent to the first one calibrated in the same points, a reduction of 50% on the indicated rate is applied. This condition cannot be combined with other forms of discount provided for internal structures.

2) Negative measuring ranges from 1 to 2 calibration points are only performed in conjunction with positive temperature ranges.

3) For the thermometric chains, the resolution of the indicator instrument being calibrated (in the case of indicator + probe) or the accuracy of the instrument (in the case of transmitters + probe) is added to this uncertainty; for liquid glass thermometers, the D factor indicates the value of the division in ° C.

4) A fee of € 50 is applied to each additional measurement point requested. For the tabulation of the results (in the case of thermocouples and resistance thermometers), the following additional cost is applied:o:

With 1 °C interval

With 0.1 °C interval

5) Depending on the number of sensors/thermometers to be calibrated, a discount may be applied, to be agreed with the Sector Manager