TESTO 6681 Profibus Instruction Manual page 58

testo 6681 Profibus
58
2 Expose the humidity probe (4) of the testo 6681 and the reference probe
(3) to the same reference conditions (e.g. in the humidity generator) and
allow climatic conditions to equalize.
3 Switch on the testo 400/650. The two-part display of the handheld
instrument will show the values of the transmitter on the left, and the
values of the reference probe on the right. The humidity and temperature
values are adjusted to the reference probe using the Probe > Probe
Adjustment menu item on the testo 400/650.
The 1-point adjustment is performed for both the humidity and the
temperature.
4 Disconnect the adapter (2) from the service interface (5).
5 Close the service flap.
1.3.6.3 2-point adjustment
With the 2-point adjustment, the parameter is adjusted to the reference value
at the two standard adjustment points 11.3 % RH and 75.3 % RH or 20 % RH
and 80 % RH. The reference conditions are created either by using Testo
humidity adjustment set (order no. 0554 0660, only for adjustment points 20
%RH and 80 %RH) or in the humidity generator.
Deviation
In the 2-point adjustment, the deviations between the reading and the
nominal value are minimized across the entire measuring range. The 2-point
adjustment is therefore recommended for large working ranges, e.g. in drying
processes.
The 2-point adjustment can be performed
via P2A software (see volume 2, chapter 3, page 135) or
using the adjustment keys under the service flap, see description of how to
proceed below.
- 1.3 Commissioning
after
before