Operation
PT12
Manual
7/20/2021
Page
29
of
48
Coefficients
Description
RTPW
Resistance
of
probe
at
triple
point
of
water
A,
B,
C
Sub
range
7
‐
11
coefficients
A4,
B4
Sub
Range
4
coefficients
A5,
B5
Sub
Range
5
coefficients
Sub
Range
Min
(°C)
Max
(°C)
Coefficients
Notes
4
‐
189.3442
0.01
A4,
B4
Below
zero
5
‐
38.8344
29.7646
A5,
B5
Subrange
5
only
7
0.01
660.323
A7,
B7,
C7
A=A7,
B=B7,
C=C7
8
0.01
419.527
A8,
B8
A=A8,
B=B8,
C=0
9
0.01
231.928
A9,
B9
A=A9,
B=B9,
C=0
10
0.01
156.5985
A10
A=A10,
B=0,
C=0
11
0.01
29.7646
A11
A=A11,
B=0,
C=0
To
select
ITS90
mode,
tap
the
coefficient
mode
drop
down
and
select
ITS90.
Depending
on
the
sub
range
selected,
the
appropriate
coefficients
will
appear.
Select
the
desired
subrange
from
the
second
drop
down
menu.
