Endress+Hauser Deltabar S PMD75 - Turn down Calculation

Document information Deltabar S FOUNDATION Fieldbus
8 Endress+Hauser
1.5 Turn down calculation
A0029545
Fig. 1:
1 Calibrated/Adjusted measuring span
2Zero-based span
3 Upper range limit
4 Calibrated/Adjusted
measuring span
Range between LRV and URV
Factory setting: 0...URL
Other calibrated spans can be ordered with customised settings.
p - Pressure
- LRL Lower range limit
- URL Upper range limit
- LRV Lower range value
- URV Upper range value
-TD Turn down
Position Term/Abbreviation Explanation
LRV
URLURV
LRL
1 = 2
3
Example
• Sensor: 10 bar (150 psi)
• Upper range limit (URL) = 10 bar (150 psi)
Turn down (TD):
• Calibrated/Adjusted measuring span: 0...5 bar
(0...75 psi)
• Lower range value (LRV) = 0 bar
• Upper range value (URV) = 5 bar (75 psi)
TD =
URL
|URV - LRV|
TD =
10 bar (150 psi)
=2
|5 bar (75 psi) - 0 bar (0 psi)|
In this example, the TD is thus 2:1.
This span is based on the zero point.