EasyManuals Logo

YOKOGAWA MX100 User Manual

YOKOGAWA MX100
126 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #79 background imageLoading...
Page #79 background image
3-10
IM MX100-01E
Calibration of Temperature Measurements using Thermocouples
Required Instruments
DC voltage/current standard
Must meet the following specifications (5520A by FLUKE or equivalent)
Output accuracy:
±(0.005%+1µV)orless
0°C standard temperature device
Must meet the following specifications (ZC-114/ZA-10 by Coper Electronics or
equivalent)
Standardtemperaturestabilityaccuracy:±0.05°Corless
Reference Junction Compensation of Thermocouple Input
The input terminal section of the universal input modules are normally near room
temperature, so the actual thermocouple output differs from the 0°C reference
thermoelectromotive value. The universal input module measures the temperature of the
input terminal and compensates by applying a corresponding thermoelectromotive power
to the actual thermocouple output. Therefore, when the measurement terminal is shorted
(equivalent to the case when the detector tip is 0°C), the measured value indicates the
temperature of the input terminal.
When calibrating the universal input module, this compensation voltage
(thermoelectromotive force of 0°C reference corresponding to the input terminal
temperature) must be subtracted from the output of the standard generator before
application. As shown in the figure, by using the 0°C standard temperature device to
compensate the reference junction at 0°C, you can input the thermoelectromotive force
of 0°C reference from the DC voltage standard and perform the calibration.
Wiring Diagram
+
-
100Vpk MAX TO
250V MAX CH TO CH
600V MAX TO
Thermocouple wires or
TC extension wires
Thermocouple
wires
Copper
wires
Copper wires
DC voltage standard
Input terminal
+
Cold junction
0°C standard temperature device
4-CH, High-Speed Universal
Input Module*
* Make a similar
connection in the
case of a 10-CH,
Medium-Speed
Universal Input
Module.
Note
Unlike the range calibration of DC voltage or RTD, the input section cannot be adjusted
for calibration of temperature measurement on the MX100 Data Acquisition Unit using a
thermocouple. If accuracy specifications are not upheld after calibration of temperature
measurement using thermocouples (see sections 4.4 and 4.5), check for input error and
other factors, then contact your Yokogawa dealer.
If errors exist in the thermocouple wires and extension wires, correct calibration is not
possible. Be sure to use a calibrated thermocouple.
3.3 Calibration

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the YOKOGAWA MX100 and is the answer not in the manual?

YOKOGAWA MX100 Specifications

General IconGeneral
BrandYOKOGAWA
ModelMX100
CategoryData Loggers
LanguageEnglish

Related product manuals