Manual

DEVICE DESCRIPTION 2
15
OPTIBAR DP 7060 C
www.krohne.com04/2014 - 4003292001 - MA OPTIBAR DP 7060 C R01 en
2.4 Terms and abbreviations
The following terms and abbreviations are used in this document.
URL
URLURL
URL
Upper Range Limit
Upper measuring range limit. Also called nominal range. The highest value
that can be measured by a particular device.
LRL
LRLLRL
LRL
Lower Range Limit
Lower measuring range limit. The lowest value that can be measured by a
particular device.
URV
URVURV
URV
Upper Range Value
The calibrated measuring range or the highest adjusted measured value.
This value corresponds to 20 mA signal.
LRV
LRVLRV
LRV
Lower Range Value
The calibrated measuring range or the lowest adjusted measured value.
This value corresponds to 4 mA signal.
SPAN
SPANSPAN
SPAN
Span
Measuring span or measuring range. SPAN = URL – LRL
CAL SPAN
CAL SPANCAL 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
TDTD
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
TDTD
TD Turn Down
LRL
LRLLRL
LRL= 0 bar
URL
URLURL
URL= 3 bar / 43.5 psi
SPAN
SPANSPAN
SPAN= 3 bar / 43.5 psi
URV
URVURV
URV= 2 bar / 29 psi
LRV
LRVLRV
LRV= 0.5 bar / 7.25 psi
CAL SPAN
CAL SPANCAL SPAN
CAL SPAN= 1.5 bar / 21.75 psi TD
TDTD
TD= 2:1
.book Page 15 Friday, May 2, 2014 10:25 AM