Model 11-R
GRIMM AEROSOL TECHNIK GmbH & Co.KG Seite 48 von 83
Please carry out the following steps:
1. Open the filter chamber and take the old filter out of the filter chamber. Clean the filter chamber
as described under 7.2.1 “Filter replacement”. Also clean the sample collection air path as
described in Section 7.1.2 “Cleaning the measuring chamber”.
2. Weigh a new filter (at least 3 times) and note the average weight you determine.
3. Centre the new, weighed filter on the large O-ring in the filter chamber and close the filter
chamber.
4. Turn the dust monitor on and answer the question “Filter changed?” with yes {+} so the calcu-
lated filter weight is set to zero.
5. Conduct your dust measurements at a characteristic location. Operate the dust monitor in a
horizontal position with the display facing up.
Please note that, if the measurement series was interrupted, the filter question when turning
on the device always has to be answered with no {-}.
6. You can display the current calculated filter weight in measuring or standby mode by pressing
the {Mean/Weight} button and the {+} button, or using the control command in HyperTerminal.
7. If the filter weight is sufficiently large (at least 1 mg dust mass), you can end the measurement
by switching to standby mode and turning the device off.
8. Avoid impacts during transportation.
9. If possible, remove the filter so that no collected material is lost. Weigh the loaded filter at least
3 times for greater accuracy. The difference to the empty filter weight is the dust mass actually
collected.
10. Calculate the gravimetry factor according to the equation below.
dust calculated
filteron t dust weigh
FactorC
To improve the measuring accuracy, you should determine the factor several times. The value should
not deviate from the basic value by more than about 30%. However, higher values are possible with
dust that contains metal.
Now the calculated C-factor can be entered into the dust monitor. All dust mass concentra-
tion values as well as their mean values are multiplied by this factor and the output on the
display is corrected accordingly. On the other hand, the measurements on the memory
card and output over the RS-232 interface are not corrected. The gravimetry factor ap-
pears in the P-line.
To Next Page
Loading...
Need help?
General