KROHNE OPTIBAR DP 7060 C EN - Manual (Page 15)

DEVICE DESCRIPTION
2
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OPTIBAR DP 7060 C
www.krohne.com 04/2014 - 4003292001 - MA OPTIBAR DP 7060 C R01 en
2.4 Terms and abbreviations
The following terms and abbreviations are used in this document.
URL URL URL URL
Upper Range Limit
Upper measuring range limit. Also called nominal range. The highest value
that can be measured by a particular device.
LRL LRL LRL LRL
Lower Range Limit
Lower measuring range limit. The lowest value that can be measured by a
particular device.
URV URV URV URV
Upper Range Value
The calibrated measuring range or the highest adjusted measured value.
This value corresponds to 20 mA signal.
LRV LRV LRV LRV
Lower Range Value
The calibrated measuring range or the lowest adjusted measured value.
This value corresponds to 4 mA signal.
SPAN SPAN SPAN SPAN
Span
Measuring span or measuring range. SPAN = URL – LRL
CAL SPAN CAL SPAN CAL SPAN CAL SPAN
Calibrated Span
Calibrated or adjusted measuring span. CAL SPAN = URV – LRV. Also called
"cSPAN".
This is the span set to the 4…20 mA output.
TD TD TD TD
Turn Down
The ratio from the measuring span to the adjusted measuring span.
TD= SPAN/(CAL SPAN) = (+URL)/(CAL SPAN)
The following applies: URV ≤ URL, CAL SPAN ≤ SPAN, TD ≥ 1
Example for TD TD TD TD Turn Down
LRL LRL LRL LRL= 0 bar
URL URL URL URL= 3 bar / 43.5 psi
SPAN SPAN SPAN SPAN= 3 bar / 43.5 psi
URV URV URV URV= 2 bar / 29 psi
LRV LRV LRV LRV= 0.5 bar / 7.25 psi
CAL SPAN CAL SPAN CAL SPAN CAL SPAN= 1.5 bar / 21.75 psi TD TD TD TD= 2:1
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