11 Operation using PROFIBUS
®
PA TMT84
74 Endress + Hauser
Call.-v. Dusen coeff.
A
read/
write
Sensor linearization based on the Callendar-Van Dusen
method.
! Note!
The Call.-v. Dusen coeff. X parameters are used for cal-
culating the response curve if "RTD- Callendar-Van
Dusen" is set in the Characterization Type n parameter.
Factory settings Call.-v. Dusen coeff. A:
3.9083E-03
Factory settings Call.-v. Dusen coeff. B:
-5.775E-07
Factory settings Call.-v. Dusen coeff. C:
0
Call.-v. Dusen coeff.
B
read/
write
Call.-v. Dusen coeff.
C
read/
write
(only visible in
online mode)
Sensor trim read/
write
• Factory trim standard calibration:
Sensor linearization with the factory calibration values
• User trim standard calibration:
Sensor linearization with the values "Calibration
Highest Point" and "Calibration Lowest Point"
! Note!
The original linearization can be established by resetting
this parameter to "Factory Trim Standard Calibration".
(only visible in
online mode)
Sensor trimming
lower value
read/
write
Lower point for linear characteristic calibration (this
affects offset and slope).
! Note!
To write to this parameter, "Sensor trimming" must be
set to "user trim standard calibration".
(only visible in
online mode)
Sensor trimming
upper value
read/
write
Upper point for linear characteristic calibration (this
affects offset and slope).
! Note!
To write to this parameter, "Sensor Calibration Method"
must be set to "user trim standard calibration".
(only visible in
online mode)
Sensor trim min
span
read Span of the measurement range, depending on the sensor
type set.
Poly. Meas. range
min
read/
write
Lower calculation limit for the RTD polynomial
(nickel/copper) linearization.
Factory settings:
For Characterization Type = copper: 0
For Characterization Type = nickel: -60
Poly. Meas. range
max
read/
write
Upper calculation limit for the RTD polynomial
(nickel/copper) linearization.
Factory settings:
For Characterization Type = copper: 200
For Characterization Type = nickel: 100
Poly. coeff. R0 read/
write
! Note!
The values for the R0 value must be in the range of 40 to
1050 Ohm.
Factory settings:
For Characterization Type = copper: 100
For Characterization Type = nickel: 100
Special linearization 1 / Special linearization 2
Menu item Parameter
"Sensor"
Submenu
"Special lineariza-
tion n"
Name
Parame-
ter access
Description
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