DURAG D-R 290, Operating Manual

Page: 158 / 202

8 | Maintenance
158 D-R 290
1. Open the four quick-release clamps and swing down the measuring unit.
2. For better handling it is recommended to dismantle the zero point reflector from the
drive shaft.
3. To do this, loosen the hexagon socket-head screws (A, see illustration) and care­
fully pull off the zero point reflector.
4. Clean the outer glass (C, see illustration) and zero point reflector (on face B, see
illustration).
5. After cleaning it, re-install the zero point reflector in its original position on the drive
axis.
6. Swing the measuring unit shut and close the four quick-release clamps.
1. Open the four quick-release clamps and swing down the reflector.
2. Carefully clean the outer glass (directly in front of / on the reflector) so that no
smears are present.
3. Swing the measuring unit shut and close the four quick-release clamps.
4. Swing the reflector shut and close the four quick-release clamps.
Terminate the zero point measurement:
Setting path:
device (D‑R 290 ) >
> Functions > Maintenances­ /
Service­Functions > Maintenance Functions > Stop
zero point test
Removing deposits from the welded-in pipes
Remove any deposits in (and also on) the welded-in pipes.
Never touch parts which could be hot without temperature-resistant equipment or pro­
tective gloves. Depending on the characteristics, pressure and temperature of the
gases in the duct, it may be that the inside of the welded-in pipes can be cleaned only
when the plant is shut down. Before removing the measuring head and reflector (in­
cluding where necessary the fail-safe shutters), make sure that none of the gases
present constitute a health hazard.
Dirt can be removed using oil-free compressed air, a brush or cloth and cleaning
agents that dry without leaving any residue (e.g. dishwashing liquid) .
Do not under any circumstances use solvents that attack aluminium.
Checking the linearity
The purpose of the linearity check is to check the functional performance of the device
in accordance with European and international standards.
Linearity filters according to US EPA and EN 15267 can be ordered from DURAG as
special accessories.
Open the housing:
First pull the plug
then open the door
Reflector unit:
Finally:
8.2.5
8.2.6
Fig. 8.3: EPA-Test filter