Instruction Manual

7 TECHNICAL DATA
64
OPTITEMP TRA/TCA PLUS
www.krohne.com 01/2012 - 4000630301 - MA OPTITEMP TRA/TCA Plus R01
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, 4...20 mA) ± 0.15%
TT 11 C/R (analogue, 3- or 4-wire circuit:
0...10 VDC)
± 0.15%
TT 20 C/R (analogue, 4...20 mA) ± 0.10%
TT 30 C/R (digital, 4...20 mA, standard) ± 0.10%
TT 31 R (3-wire-circuit, 4...20 mA ± 0.10%
TT 32 R (4-wire circuit, 0/4...20 mA: 0/2...10 VDC) ± 0.20%
TT 40 C/R (digital, 4...20 mA, precise) ± 0.05%
TT 50 C/R (digital, 4...20 mA, HART
®
)
± 0.10%
TT 51 C/R (digital, 4...20 mA, HART
®
, SIL2)
± 0.05%
TT 60 C/R (digital, Profibus-PA) ± 0.10°K
.backup.book Page 64 Tuesday, January 10, 2012 11:57 AM