EN
WIKA operating instructions, model CTR3000
37
14191761.01 05/2019 EN/DE
6. Commissioning, operation
a.
EN 60751 as defined in the standard
Generic EN 60751 conversion can be used with PRTs that are made with a grade of wire that meets the
requirements of the standard. The measurement uncertainty will depend on the class of thermometer and its
temperature.
Standard coefficients:
R
0
= 100 Ω
A = 3.9083 x 10
-3
°C
–1
B = -5.775 x 10
-7
°C
–2
C = -4.183 x 10
-12
°C
–4
b.
Callendar-van-Dusen like specified in the calibration certificate: R
0
, A, B and C
This follows the formula:
R
t
= R
0
[1 + A
t
+ B
t2
+ C (t - 100 °C) t
3
]
(C = 0, if t > 0 °C )
c.
ITS-90 as specified in the calibration certificate: R
0
.01, an, bn, ap, bp, cp, dp
Make sure using the correct calibration parameters for the thermometer, since incorrect calibration parameters
lead to erroneous results. The coefficients can be found in the calibration certificate while ordered a calculation.
If you order a CTR3000 with a resistance thermometer and a system calibration with calculation of the
coefficients, the probe will be stored under the serial number and will be calibrated with the normal sensor
current. No root 2.
6.4.3.2
New probe [Thermocouples]
1. To configure a new thermocouple press the button
[Thermocouple (TC)]
.
⇒
The menu with all settings opens on the right.
2. Enter the desired settings.
3. Confirm with button
[Store]
.
