Endress+Hauser Deltabar FMD72 - Terms and Abbreviations; Registered Trademarks

Deltabar FMD71, FMD72
6 Endress+Hauser
Device Directive Documentation Option
1)
FMD72 FM C/US IS Cl.I Div.1 Gr.A-D, AEx ia, Zone 0,1,2 XA00624P FA
FMD72 FM C/US XP AIS Cl.I Div.1 Gr.A-D, Exd [ia] Zone 0,1,2 XA00625P FB
FMD72 FM C/US NI Cl.I Div.2 Gr.A-D, Zone 2 XA00669P FD
1) Product Configurator order code for "Approval"
The nameplate provides information on the Safety Instructions (XA) that are relevant for the
device.
Terms and abbreviations
Term/abbreviation Explanation
XA Document type "Safety Instructions"
KA Document type "Brief Operating Instructions"
BA Document type "Operating Instructions"
SD Document type "Special Documentation"
PN Nominal pressure
MWP The MWP (maximum working pressure) for the individual sensors depends on the lowest-rated
element, with regard to pressure, of the selected components, i.e. the process connection must be
taken into consideration in addition to the measuring cell. Also observe pressure-temperature
dependency. For the relevant standards and additional information, see the "Pressure specifications"
→  29 section.
The MWP can also be found on the nameplate.
OPL The OPL (over pressure limit = sensor overload limit) for the measuring device depends on the
lowest-rated element, with regard to pressure, of the selected components, i.e. the process
connection has to be taken into consideration in addition to the measuring cell. Also observe
pressure-temperature dependency. For the relevant standards and additional information, see the
"Pressure specifications"→  29 section.
LRL Lower range limit
URL Upper range limit
LRV Lower range value
URV Upper range value
TD Turn down
Set span and zero-based span.
½Lower range value (LRV) ½ < ½ Upper range
value (URV)½
Example with measuring cell
HP = 1 000 mbar (15 psi) and measuring cell
LP = 400 mbar (6 psi):
LRL = 400 mbar (6 psi):
• Lower range value (LRV) =
–300 mbar (–4.35 psi)
• Upper range value (URV) = 0 mbar
• Nominal value (URL) = 1 000 mbar (15 psi)
Turn down:
TD = URL + ½LRL½/½ URV - LRV ½ 4.66:1
Set span:
URV – LRV = 300 mbar (4.35 psi)
This span is based on the zero point.
LRV
URLURV
LRL
1 = 2
3
4
5
A0016451
1 Set span
2 Zero-based span
3 Nominal value upper range limit (URL)
4 Nominal measuring range
5 Sensor measuring range
Registered trademarks
HARTâ
Registered trademark of the HART Communication Foundation, Austin, USA