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PRT Calc The Pt100 platinum resistance thermometer utility
Version 1.03

PRTCalc

Prt Table PRTCalc is a utility for those involved with PT100 platinum resistance thermometers. It allows for the accurate conversion of resistance to temperature or temperature to resistance. PRTCalc is a small utility that can sit on the desk top alongside other applications. The calculated results can easily be imported to spreadsheets or other applications for presentation, storage or whatever. PRTCalc conforms to IEC 751 Amendment 2: December 1995. PRTCalc also knows the values for the earlier issue of IEC 751. The user may enter custom coefficients to suit individual probes. Probe specific calculations can then be performed with all entered data available stored alongside a tag name for the platinum resistance thermometer supplied. Output data can also be saved as a text file.

 

Features

  1. Can Generate Large Tables or Single Values
  2. Convert Temperature to Resistance with high accuracy
  3. Convert Resistance to Temperature to approx. 0.01C
  4. Allows very large lists of data
  5. Output Can be Saved as a text file
  6. Allows marking and copying of result data
  7. Stores coefficients for user entered probes
  8. Probe Management.
  9. Unit Choice - Celsius, Fahrenheit or Kelvin

Installing PRTCalc

1, Make a new directory, e.g PRTCALC2, Copy the two files Prt103.exe and Prt103.tab to the new directory3, Make a short cut to Prt103.exe

Using PRTCalc

 

Unit Selection

Select C, F or Kelvin from the Units menu

 

Direction

Choose between calculating from resistance to temperature or temperature to resistance from the Direction menu.

 

Copy to Clipboard

Use the Edit menu to copy data to the clipboard, the data can then be pasted for example into a spreadsheet to produce a graph

 

Saving Data

The output can be saved form the FILE menu, Save As the output is saved as a .txt file

Entering coefficients

From the File menu select Open PRT Editor Enter a reference name in the Name box.You can now enter coefficients for either a unique temperature probe typically from a certificate of calibration.PRTCalc is supplied with two sets of coefficients pre-entered. The default is for IEC 751 Amendment 2: December 1995. The other option, PRE-ITS90 is for the values specified in IEC 751 prior to the Dec 1995 amendment.After entering new values you must save them with the Save PRT List option from the File menu

 

Entering Data

Simply type the start value in the start box, the end value in the finish box and the increment or step in the step box.If you wish to calculate single values rather than a range of values then leave the Finish box empty.

 

Sample Conversion Data

Temperature to Ohms



Ohms to Temperature

Temp C

IEC Table

PRTCalc



IEC Table

PRTCalc

-200

18.52

18.5201



18.52

-200

-150

39.72

39.7232



39.72

-150.008

-100

60.26

60.2558



60.26

-99.9897

-50

80.31

80.3063



80.31

-49.9906

0

100

100



100

0

50

119.4

119.3971



119.4

50.0075

100

138.51

138.5055



138.51

100.0119

150

157.33

157.3251



157.33

150.013

200

175.86

175.856



175.86

200.0109

250

194.1

194.0981



194.1

250.0052

300

212.05

212.0515



212.05

299.9958

350

229.72

229.7161



229.72

350.0111

400

247.09

247.092



247.09

399.9942

450

264.18

264.1791



264.18

450.0026

500

280.98

280.9775



280.98

500.0075

550

297.49

297.4871



297.49

550.0088

600

313.71

313.708



313.71

600.0062

650

329.64

329.6401



329.64

649.9996

700

345.28

345.2835



345.28

699.9887

750

360.64

360.6381



360.64

750.0062

800

375.7

375.704



375.7

799.9866

850

390.48

390.4811



390.48

849.9962

Tips

1, You can run multiple copies of PRTCalc simultaneously allowing the ability to see the effects of different coefficients or for multiple thermometers.

2, If you wish to calculate single values rather than a range of values then leave the Finish box empty.

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