Rotor Selection; Sample Volume Selection - Merck RCS High Flow Touch Bedienungsanleitung

3.5

Rotor Selection

The Rotor Menu can be selected directly form the
Main Menu or from the Option Menu. For each
selected rotor the serial number and the expiration
date of the calibration is displayed. The rotor is
selected or changed by using the arrows.
NOTE
The rotor icon gives access to the Rotor
Menu. Here, the rotors that have been
calibrated with the device are displayed
and can be selected by using the arrows.
A red rotor icon indicates that the cali­
bration of the rotor has expired.
Selection of a rotor from the list of cali-
brated rotors
Save selected rotor
Go to Menu Calibration Factor
Expected total counts in CFU per m
of ambient air
0 to 10
10 to 200
200 to 500
500 to 1.000
1.000 to 2.500
2.500 to 10.000
10.000 to 20.000
3.6 Sample Volume
Selection
The instrument is offering ten positions for sample volumes. Factory settings
reserve the first seven positions for the volumes 10, 20, 50, 100, 200, 500 and
1000 liters. Three addional positions can be user defined with sampling
volumes from 1 to 2000 liters (see page 37).
After the instrument has been switched on the previous sampling volume is
displayed. Another sampling volume can be selected by using the arrows.
For higher sample volume values use the
the icon.
The appropriate sample volume is dependent on the number of suspected micro-
organisms. It is recommended to select a sample volume that yield a statistically
representative number of colony forming units (CFU) on the agar strip. The
number of expected colonies corresponds to a sampling volume of 1000 L.
The table below indicates the expected CFU as per sample volume:
NOTE
If the expected number of CFU is unknown it is recommended to select
a higher sample volume in order to avoid false negative results.
3 Sample volume
® High Flow Touch
RCS
1.000
500
200
100
50
20
10
icon, for lower sample volumes use
Number of CFU
per agar strip
0 to 10
5 to 100
40 to 100
50 to 100
50 to 125
50 to 200
100 to 200
Factor
1
2
5
10
20
50
100
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