Owner's manual

7 TECHNICAL DATA
52
OPTITEMP TRA/TCA
www.krohne.com 08/2010 - 4000630501 - MA OPTITEMP TRA/TCA R01 en
7.4 Measuring accuracy
The measuring accuracy depends largely on the following factors:
• The version of the measuring insert (type of sensor, type of circuit, measuring range).
• The correct dimensions (diameter, wall thickness) and insertion length of the thermowell for
good thermal coupling to the process temperature (insufficient insertion depth often results
in measurement errors).
• The type of temperature transmitter used.
With the exception of the TT 60 C/R version, all of the temperature transmitters generate an
analogue output signal. For this reason, the following table indicates the measuring accuracy of
most of the transmitters as a percentage of the measuring range:
Temperature transmitter
INFORMATION!
Please consult the appropriate handbook for further information regarding the accuracy of the
measuring inserts and the temperature transmitters.
Type of temperature transmitter Accuracy (% of the measuring range or °K)
TT 10 C/R (analogue, standard) ± 0.15%
TT 11 C/R (analogue, voltage output) ± 0.15%
TT 20 C/R (analogue) ± 0.10%
TT 30 C/R (digital, standard) ± 0.10%
TT 40 C/R (digital, precise) ± 0.05%
TT 50 C/R (digital, HART
®
)
± 0.10%
TT 51 C (digital, HART
®
, SIL2)
± 0.05%
TT 60 C/R (digital, Profibus) ± 0.10°K
.book Page 52 Tuesday, August 17, 2010 12:18 PM