DURAG D-R 290, Operating Manual

Page: 161 / 202

8 | Maintenance
D-R 290 161
Fig. 8.6: Example of a linearity test with scaling
Zero point check
The zero point check can be started and stopped by:
Setting path:
Device (D‑R 290 ) >
> Functions > Maintenance /
Service Functions > Start zero point check
Device (D‑R 290 ) >
> Functions > Maintenance /
Service Functions > Stop zero point check
During the zero point check the device measures the received intensity with the zero
point reflector swung into position, and compares it with the reference value. The out­
put from the measuring channels is dependent in every case on the settings for the
channel (see section 7.5.3.6 Settings [
}
133] ).
Direct output of the opacity measured during the current measurement and during the
last zero point measurement can be found under:
Setting path:
Device (D‑R 290 ) >
> Specific parameters >
D‑R 290
Measured values > Zero point value [% OP
SP]
Contamination check
The D−R 290 automatically performs a contamination measurement once an hour.
The contamination measurement can also be performed manually via:
Setting path:
Device (D‑R 290 ) >
> Functions > Maintenances­ /
Service Functions > Start contamination check
Device (D‑R 290 ) >
> Functions > Maintenance /
Service Functions > Stop contamination check
8.2.7
8.2.8