KROHNE OPTITEMP TCA Ex EN - Manual (Page 17)

DEVICE DESCRIPTION
2
17
OPTITEMP TRA/TCA
www.krohne.com 10/2010 - 4001087001 - Ex AD OPTITEMP TRA/TCA R02 en
2.7.4 Temperature at process connection (with temperature transmitter, classes T5 and
T6)
As special restrictions apply to temperature classes T5 and T6, you must heed the information
about the maximum ambient temperature in the temperature transmitter documentation.
Calculate the maximum permitted temperature at the process connection for all thermometers
with a temperature transmitter in temperature classes T5 and T6 as follows:
Coupling factors of the thermometer models
DANGER!
Always refer to your temperature transmitter documentation for the maximum permitted
ambient temperature of the temperature transmitter (T
aTT
).
1 T P
= process connection temperature
2 k = coupling factor of thermometer versions (see table later in this subchapter)
3 T
aTT = ambient temperature around the temperature transmitter (see transmitter documentation)
4 T a = ambient temperature at the measuring point
DANGER!
In order to prevent injury and material damage, always observe the limit values of the assigned
temperature class. For further information refer to Maximum permitted product temperature on
page 12
Thermometer model Coupling factor [k]
TxA-S11, threaded thermometer, neck pipe length ≤ 80mm 0.42
TxA-S12/41, threaded thermometer, neck pipe length ≥ 80mm 0.086
TxA-P10/40, insert thermometer with thermowell TxA-P10, neck pipe
length ≤ 80mm 0.212
TxA-P10/40, insert thermometer with thermowell, neck pipe length
≥ 80mm
0.095
TxA-P14, insert thermometer without thermowell, neck pipe length
≤ 80mm
0.212
TxA-P14, insert thermometer without thermowell, neck pipe length
≥ 80mm
0.095
TxA-F13/42, flange thermometer, neck pipe length ≥ 80mm 0.077
.book Page 17 Friday, November 19, 2010 2:23 PM