Endress+Hauser Waterpilot FMX21 - Turn down Calculation

Waterpilot FMX21 About this document
Endress+Hauser 9
Item Term/abbreviation Explanation
4 Calibrated/adjusted
span
Span between LRV and URV
Factory setting: 0 to URL
Other calibrated spans can be ordered as customized spans.
p - Pressure
- LRL Lower range limit
- URL Upper range limit
- LRV Lower range value
- URV Upper range value
- TD (turn down) Turn down
Example - see the following section.
- PE Polyethylene
- FEP Fluorinated ethylene propylene
- PUR Polyurethane
1.6 Turn down calculation
LRV
URLURV
LRL
1 = 2
3
A0029545
1 Calibrated/adjusted span
2 Zero point-based span
3 URL sensor
Example
• Sensor:10 bar (150 psi)
• Upper range value (URL) = 10 bar (150 psi)
Turn down (TD):
• Calibrated/adjusted span: 0 to 5 bar (0 to 75 psi)
• Lower range value (LRV) = 0 bar (0 psi)
• 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 2:1.
This span is based on the zero point.