BEAMEX MC4 - External Reference Junction

Related Information
114 MC4 User Guide
External Reference Junction
When using an external Reference Junction, MC4 measures or
simulates the thermovoltage using the "T/C" terminals. The following
external Reference Junction compensation methods are available:
External RTD:
To be used when:
• The Reference Junction temperature is measured using an
RTD sensor connected to MC4's RTD terminals.
Connection when measuring/simulating thermocouples using
Reference Junction compensation method " External RTD ":
M e a s u r e
M a x 6 0 V , 3 0 V , 1 0 0 m A
s e n s e
R , R T D R m e a s
V , I ,
V , I ,
T e m p e r a t u r e / G e n e r a t e
T / C
m V
M a x 6 0 V , 3 0 V , 1 0 0 m A
s e n s e
R , R T D
R m e a s
V , I ,
T e m p e r a t u r e / G e n e r a t e
T / C s e n s o r
o r a
T / C s i g n a l r e c e i v e r
T
r e f
T / C m a t e r i a l s
C o p p e r
Warning!
If you connect an RTD sensor to the RTD connectors, there is no
galvanic isolation between the thermocouple and the RTD
sensor.
None (0 °C):
To be used when:
• The Reference Junction temperature is fixed to 0°C (using,
e.g. ice) and MC4 is not used for measuring the Reference
Junction temperature.
• The Reference Junction temperature is controlled with 0°C
set point.
• A compensation box is used and the Reference Junction
temperature setting is 0°C.
• There is no Reference Junction compensation in the
measuring/simulation circuit but 0°C is a good enough
approximation.