AdEM™-PTZ
ROMET LTD. 39
MCO2 - Mol fraction CO2
MN2 - Mol fraction N2
MH2 – Mol fraction H2
* Gas Molar list - detailed gas composition.
Temperature Factor Calculation
(Tbase + 459.67 °R) (Tbase + 273.15 °K)
TF = (Imperial) or (Metric) -------- Eq. 4
(Tgas + 459.67 °R) (Tgas + 273.15 °K)
Where:
Tbase Base Temperature (32°F to 86°F, 0°C to 30°C)
Tgas Flowing gas temperature
Pressure Factor Calculation
Pabs
PF = --------- Eq. 5
Pbase
In case of using gauge type of pressure sensor Pabs = Pgauge + Patmospheric.
Pabs Flowing gas pressure: psia (imperial); kPa or bara (metric)
Pbase Base Pressure: psia (imperial); kPa or bara (metric)
PTZ Conversion Test Steps
1. After entering TESTING mode, temporary reinstall pressure and temperature sensors to measure reference
pressure and temperature.
2. Enter CONVERT, testing is being started. Scrolling down to UNC CF or COR CF display shows zeroes or
numbers respective to collected already input volumes up to three – depends of stage of test. Number has
three (imperial) or four (metric) digits after decimal point for high resolution of reading.
3. Test runs until Uncorrected volume of 3 Input Volumes is reached, then it stops displaying Uncorrected
(UNC CF ) and Corrected (COR CF) Volumes, which are ready for writing down and accuracy calculations.
4. After exiting from PTZ Conversion continue with Sensor Accuracy or reinstall pressure and temperature
sensors in original application before exiting TESTING mode (to return AdEM®-PTZ to Normal Mode).
5. Upon exiting TESTING Mode, regular Volume Indexes are updated, and unit exits to its Normal Mode
Sensor Accuracy
The sensor accuracy test menu provides an effective method for verifying the accuracy of the temperature and
pressure sensor. The menu displays the live gas temperature, pressure and supercompressibility factor for
comparison with a pressure and temperature reference standard. Eq. 1 can be used to calculate true error, whereas:
Registered is the value of pressure, temperature or supercompressibility factor displayed by the AdEM®-PTZ under
test and true is the value of temperature or pressure factor calculated with Eq. 4 and 5 respectively for the pressure
and temperature from reference standards. The true value for the supercompressibility factor would be calculated
using the values of the reference pressure and temperature standards. It is recommended that two to three pressure
and temperature values across the operating range of the sensors are verified. In the event, that a sensor is found
have a significant error (> 0.5%), refer to Section 6, CALIBRATION.
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