Greiner Bio-One Sed Rate Timer 10/II User Manual page 25

9.2 Periodic test
In order to assure the correct performance of instrument and obtaining precise results, it
needs to perform a periodic test, once a month, which controls the accurate calibration of
the device. The test has to be done using the Greiner Control Unit (Control Tool).
This tool can be used by service people to check the
mechanical calibration and functionality of the instrument.
It can be used to check:
- Mechanical calibration of the reading system.
- Mechanical level reading reproducibility.
- Tubes reference levels reading at ambient
temperature.
- Results conversion at the reference temperature of
18°C.
- Internal temperature sensor readings.
HOW TO ENTER INTO "SELF TEST" FUNCTION
- Switch off the instrument and remove all tubes, which should be in the device
Insert the "Control Tool" tubes, with 60, 50 and 30 mm reference level, respectively in
-
positions 1, 2, and 3 of the instrument reading plate. All other reading positions must be
empty.
- Turn on the instrument and wait. The instrument detects this special condition and
starts the self-test.
After a while (the reading plate must complete a reading cycle down/up) on the display the
following information will appear (this is just a screen example).
SELF TEST
Temp. 25.0 C. ( 18C
On the left, at the bottom of the display you can find the value of the internal instrument
temperature. On the right of the display there the mechanical calibration reference (must
be 300 +/- 10)
st
The 1 results row values must be:
nd
The 2 row values depends on the internal instrument temperature. The table below must
be used to get the reference values for the 2
instrument temperature is included within a specified range.
Temperature correction table for 2
Reference Temp.
Values <= 16.3°
24 27
93 103
SRT 10/II
( a.t. 1
1
1,
nd
Temp. Temp.
16.4–18.7 18.8–21.2
24 23
96 91
USER MANUAL
24 93 )
19 81 )
24(+/-5), 93 (+/-5)
nd
row. Look at the column where your internal
row values (°C), the tolerance is (+/-5).
Temp. Temp.
21.3–23.7 23.8–26.2
21 19
86 81
M.STEPS
300
Temp. Temp.
26.3–28.7 28.8–31.2
17 15
75 70
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Temp.
> 31.3
15
70