VEGA VEGABAR 55 Foundation Fieldbus - climate compensated - Manual (Page 41)

41
8 Maintenance and fault rectification
VEGABAR 55 • Foundation Fieldbus - climate compensated
39443-EN-130321
•
F
total
: Total deviation
•
F
perf
: Basic accuracy
•
F
stab
: Long-term drift
•
F
T
: Temperature coefficient (influence of medium or ambient
temperature)
•
F
Kl
: Deviation
Example
Pressure measurement in the pipeline 8 bar (800 KPa)
Ambient temperature 40 °C, product temperature 10 °C, hence within
the compensated range
VEGABAR 55 climate compensated, with measuring range 10 bar
Calculation of the set Turn Down: TD = 25 bar/8 bar, TD = 1.25
Basic accuracy digital output signal in percent:
F
perf
= √((F
T
) 2 + (F
Kl
) 2 )
F
T
= (0.05 + 0.1 x TD)%
F
Kl
= 0.25 %
F
perf
= √((0.05 + 0.1 x 1.25)%) 2 + (0.25 %) 2 )%
F
perf
= 0.31 %
Total deviation digital output signal in percent:
F
total
= F
perf
+ F
stab
F
stab
= (0.1 % x TD)/year
F
stab
= (0.1 % x 1.25)/year
F
stab
= 0.125 %
F
total
= 0.31 % + 0.125 % = 0.43 %
Total deviation digital output signal absolute:
F
total
= 0.43 % x 8 bar/100 % = 34.4 mbar
8.4 Exchanging the electronics module
In case of a defect, the electronics module can be exchanged by the
user against an identical type. If no electronics module is available on
side, the module can be ordered from the agency serving you.
Ordering and exchange are possible with or without sensor serial
number. The electronics module with serial number includes order-
specific data such as factory setting, seal material etc. These are not
included in the electronics module without serial number.
The serial number is stated on the type label of VEGABAR 55 or on
the delivery note.
8.5 Software update
The software version of VEGABAR 55 can be determined as follows:
•
on the type label of the electronics
•
Via the display and adjustment module
•
via PACTware