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14
X
SEL
,
Y
SEL AND
Z
SEL COMMANDS
In the basic display, the function F1 is associated with the
Xsel
command. With this command it is
possible to set the variable that is to appear on the first line of the display: this variable refers to all
three inputs of the instrument. Each probe has a maximum of three variables: for example, in the
SICRAM module TP471D1 with two thermocouple inputs connected to connector A of the instru-
ment, A1 represents the first thermocouple, A2 the second and A3 the sensor which measures the
temperature of the cold junction. If you press F1 (Xsel) repeatedly, the first line of the display will
show either all available variables, according to the modules connected to the instrument inputs, or
the instrument internal temperature (Ti), or no measurement. In this case, the “>>” symbol will ap-
pear on the left side of the instrument. In addition to the variables associated with each probe (A1,
A2, A3, B1, … , C3), you can also select the difference between two of the three inputs identified
with the number 1 (A1-B1, A1-C1 and B1-C1). The difference between two inputs is available only
if probes of the same type are connected to these inputs, for example two thermocouples, two rela-
tive humidity probes, two Pt100. The difference between different types of probes is not available,
even if they refer to the same physical quantity: for example the difference between a Pt100 and a
thermocouple, even they both measure temperature, as well as the difference between two pressure
probes having a different full scale.
Associated with the functions F2 and F3 are the
Ysel
and
Zsel
commands are used to set respec-
tively the variables on the second and the third line of the display.
Ti
A1
b1-C1
c3
F1
F1
F2
F2
F3
F3
A
B
C
X row
Y row
Z row
Controls bar
INPUTS
