Retsch DustMon RD 100, Руководство пользователя

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DustMon RD 100
– Measurement using the internal control unit
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7 DustMon RD 100
– Measurement using the internal control unit
The DustMon RD 100 as a basic system (stand-alone unit) operates with an internal PC that
controls the entire measurement and shows the results as values and as a graph on the display.
Only two keys are required to perform measurements:
R key (Run) to start the measurement and
S key (Stop) to stop/cancel a measurement .
Fig. 10: DustMon RD 100 display
Performing a measurement:
- After filling the sample container (typically 30 g), press the R button
- "AutoZero" is shown on the display; there is then a countdown from 5 to 0 to perform a
“Zero measurement”.
- The sample flap opens and closes audibly.
- The sample material falls into the collecting box and the measurement begins.
- After 30 seconds the measurement has finished and results are displayed.
7.1 Measurement Considerations
•
The standard amount of sample should be 30 grams measured for 30 sec. Longer times
may be preferred depending upon the situation. If there is a lot of dust (dust index
greater than 20
– 30) and the curve is not decreasing, a longer time should be selected
to give a better indication as to how long the dust stays in the air.
•
Dust index should be less than 50. Appropriate dust index values are 4
– 12
with the white light. If less than 3, then the laser should be used. If value is
greater than 50, then repeatability may not be as good.
•
Dust may get trapped in a large mass that drops into the bin and not be
released on a repeatable basis. Note a value of 100 is total blockage of the light
(i.e. putting your hand in front of the light). Clean the bin and tube after every