Endress+Hauser Deltapilot M FMB51 - Explanation of Terms

Deltapilot M FMB50/51/52/53
Endress+Hauser 11
Explanation of terms
Explanation of terms: turn down (TD),
set span and span based on zero point
Case 1:
• ⏐Lower range value (LRV)⏐ ≤ ⏐Upper range value
(URV)⏐
Example:
• Lower range value (LRV) = 0 mbar
• Upper range value (URV) = 40 mbar (0.6 psi)
• Nominal value (URL) = 400 mbar (6 psi)
Turn down:
•TD = URL / ⏐URV⏐ = 10:1
Set span:
• URV – LRV = 40 mbar (0.6 psi)
This span is based on the zero point.
P01-DBxxxxxx-05-xx-xx-xx-001
Example: 400 mbar (6 psi) measuring cell
Case 2:
• ⏐Lower range value (LRV)⏐ ≥ ⏐Upper range value
(URV)⏐
Example:
• Lower range value (LRV) = –200 mbar (3 psi)
• Upper range value (URV) = 0 bar
• Nominal value (URL) = 400 mbar (6 psi)
Turn down:
•TD = URL /⏐(LRV)⏐ = 2:1
Set span:
• URV – LRV = 200 mbar (3 psi)
This span is based on the zero point.
P01-DBxxxxxx-05-xx-xx-xx-002
Example: 400 mbar (6 psi) measuring cell
1 Set span
2 Span based on zero point
3 Nominal value i upper range limit (URL)
4 Nominal measuring range
5 Sensor measuring range
LRL Lower range limit
URL Upper range limit
LRV Lower range value
URV Upper range value
–400 mbar
0
+400 mbar
40
LRL
LRV
URL
URV
➁➀
=
➂
➃
➄
–400 mbar
+400 mbar
LRV
URLURV
➂
0
LRL
–200 mbar
➁➀
=
➃
➄