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76
8014084/ZWT7/V3-1/2020-06 | SICK
O P E R A T I N G I N S T R U C T I O N S | TRANSIC111LP
Subject to change without notice
6
ADJUSTMENT
6.3.6
Two-point adjustment using the keypad (function CAL2)
The procedure is the same as for one-point calibration but the adjustment continues
automatically with the second reference point.
This adjustment calculates and sets new gain and offset parameter values. A two-point
adjustment uses one gas to adjust the lower limit value of the measuring range and then a
different gas to adjust the upper limit value of the measuring range. These can be, for
example, pure nitrogen (0.0% O
2
) and an N
2
/O
2
mixture (for example, 21% O
2
). The
minimum difference between the two span gas concentrations in two-point adjustment
should be at least 4% O
2
.
When adjustment conditions (gas pressure, humidity and CO
2
concentration) are different
from the operating conditions of the measuring device, set the ambient parameters of the
measuring device to the adjustment environment for the adjustment duration. These
settings must then be changed back to represent the process conditions when the
TRANSIC111LP is reinstalled in its operating environment. Further information on setting
the ambient parameters of the TRANSIC111LP can be found in Section 5 of these
Operating Instructions.
1
Check that no error messages are active.
Active error messages influence adjustment. Malfunction messages,
. (Serial interface) and
see “Display of active and undeleted errors (ERR)”,
(keypad) Error Table
.
2
Select menu item
Cal2
. This holds the analog output.
3
First close off the gas for the
first (lower limit)
reference point.
4
Enter the known span gas value and confirm with
Ent
.
5
The measured value display blinks.
6
Feed calibration gas.
7
Wait until the display shows a stable value.
8
Enter the known span gas value and confirm with
Ent
.
9
Now close off the gas for the second (
upper limit)
reference point.
10
Confirm with
Ent
. The display now shows
Set hi
and the adjustment for the second
(upper) reference point starts and “Set Hi 10.0%” is displayed.
PASS
is displayed when the calibration is successful. The display now shows the O
2
value when no further input is made.
11
The device now calculates the new gain and offset settings and starts to display the new
measured result.
12
Press
Ent
twice. This ends the two-point adjustment.
Fig. 36: Two-point adjustment using the keypad
Ent
Ent
Back
Back
k
<
<
<
<
Ent
Ent
2 x
Back
Back
k
<
<
<
<
<
<
<
!
!
<
<
<
<
<
<
<
Up
Up
Dn
Dn
Up
Up
Ent
Ent
Dn
Dn
<
<
Ent
Ent
5 s
Ent
Ent
5 s
Ent
Ent