Flexim PIOX SM Ergänzung Zur Bedienungsanleitung Seite 28

Measurement with PIOX S
1.8.1 Calibration of the Concentration Measurement
Calibration coefficient K
Every time the installation (e.g. the transducer distance) is changed even slightly, the measurement has to be calibrated
again.
• Activate storing of the measured values (see section 1.7).
• Start the measurement (see section 1.8).
• Wait until the flow transducers are thermally stable.
• Use key and during the measurement to display the temperature, the sound speed c
Write down the values.
• Compare the measured concentration with the current concentration in the pipe (laboratory value).
• Define the calibration coefficient K
- Open the concentration curve of the medium in the program FluxKoef.
- Enter the medium temperature (1).
- Move the cursor (2) on the curve to the concentration value supplied by the laboratory. The exact value is displayed
above the curve (3). Zoom into the curve, if necessary.
- The corresponding sound speed c
- Define the calibration coefficient: K
Example
measured values:
concentration: 5.81 %
temperature: 24 °C
sound speed c : 1635 m/s
m
concentration from the laboratory: 5.34 %
For a concentration of 5.34 % and a temperature of 24 °C, the sound speed c
(see Abb. 1.1).
K = 1625.9 m/s - 1635 m/s = -9.1 m/s
0
28
0
(see Abb. 1.1):
0
for this concentration is displayed (4).
c
= c - c
0 c m
Fig. 1.1: Concentration curve in the program FluxKoef
3 1 4
in the program FluxKoef is 1625.9 m/s
c
Supplement to User Manual - ENGLISH
and the concentration.
m
2
SUPIOX-SV3-0, 2011-11-29