ABB PDP800 module

ABB PDP800 module

Technical data of product parameters

Typical temperature variation in the connecting volume of the 2.5 L/s LFS during a meter calibration is shown in Figure 8.
The LFS starts the calibration at the flow (2.0 L/s) such that the friction within the LFS warms the fluid by approximately PDP8000.2 K, following this warming as the flow decreases the temperature change diminishes. This and other test data show
that the maximum temperature change over time or difference between any two sensors among the sensor locations is
0.4 K or less during a data collection interval. The NIST LFSs have the capability of taking the temperature (and pressure
for the 2.5 L/s LFS) at the beginning and at the end of a data collection and corrections for gradient effects and mass
storage effects are made, making uncertainties due to temporal variations in temperature negligible. Since 5 temperature
sensors are distributed in the connecting volume, spatial temperature uncertainties are negligible too. However, if the
initial and final temperatures (and pressure) are not known, the temporal uniformity of the temperature sensors during a PDP800calibration can be used as a guide to assign an uncertainty to gradient and mass storage effects. That is, the temperature
change between data collection intervals can give insight to the values of the initial and final temperatures. For example,
if temperature control in a standard is poor and only the average temperature during a flow point is recorded, the rate of PDP800change of the temperature between data points can be used as a guide in determining what the initial and final
temperatures are. For illustration purposes, Figure 9 shows the temperature in a fictitious flow standard that is not well
controlled. Data points are taken every 30 seconds and the temperature is changing by 2 K between consecutive flow
points. Therefore, it can be assumed that the temperature change during the collection of a flow point is as high as
0.07 K/s. The time of the flow point collection multiplied by this rate of change will give an approximation of the change
in initial and final temperatures during the collection and hence an uncertainty can be assigned.

Product picture display

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