Siemens SITRANS F Series Operating Instructions Manual page 100

Diagnostics and troubleshooting
10.3 Operation troubleshooting
E = ±
E
Z
qm
Cal. = Calibrated flow accuracy: 0.10 or 0.2
0.15
-0.15
Table 10-1
Flow conditions Fully developed flow profile
Temperature,
medium
Temperature,
ambient
Liquid pressure 2 ± 1 bar
Density
Brix
Supply voltage
Warming-up time 30 min.
Cable length
Table 10-2
Current output
Effect of ambient
temperature
Effect of supply
voltage
Step 4: Improving the application
In the following it is described how to find the causes of a high Zero point standard deviation and
how to improve the installation.
100
2
z x 100
( )
2
(Cal) +
qm
= Error [%]
= Zero point [kg/h]
= Mass flow [kg/h]
Error in % of actual mass flow rate with 95% confidence
(probability)
1.0
0.5
-0.5
-1.0
5% 25%
Actual mass
flow rate
Reference conditions for flow calibrations (ISO 9104 and DIN/EN 29104)
20 °C ± 2 °C (68 °F ± 3.6 °F)
20 °C ± 2 °C (68 °F ± 3.6 °F)
0.997 g/cm3
40 °Brix
Un ± 1 %
5 m between transmitter and sensor
Additions in the event of deviations from reference conditions
As pulse output ± (0.1% of actual flow +0.05 % FSO)
● Display/frequency/pulse output: < ± 0.003%/K act. ± 3.6 °F)
● Current output: < ± 0.005 %/ K act.
< 0.005 % of measuring value on 1 % alteration
50% 75% 100%
FSO (sensors
max. flow rate)
Operating Instructions, 01/2019, A5E44036384-AB
SITRANS FC310