37
Semi-Micro Osmometer K-7400S instructions, V3700
11. Maintenance and care
11.1 Cleaning the stirring wire and the thermistor
Note:
Stirring wire and thermistor should not be touched.
Skin injury
Risk of infection due to injuries caused by a contaminated stirring wire.
Wear protective gloves when handling the measuring head.
Stab injury
Risk of injury from stirring wire when detaching it by hand.
Detach the stirring wire only with sample tube attached.
The measuring head parts which are wetted from the sample can be clea
ned easily by the user by attaching a sample tube with a suitable cleaning
solution to the measuring head (see „Important operating notes“ on page
Note:
The supply and the appropriate use of these cleaning solutions is
in the responsibility of the user.
11.2 Function checks of cooling capacity
The cooling capacity can be checked by measuring the temperature in
the cooling cavity (– 13 to – 16 °C during cooling down and ~ 20 °C in
standby position).
The device must be calibrated.
1.
Connect the cable of the measuring head with the device and place
the head on top of it (see page 16).
2.
Press the <START/STOP> button to start the measurement and wait
5 minutes to get the error message <MEASUREMENT TIMEOUT> on
the display.
3.
Press quickly twice the
Ú
button to read out the cooling cavity value
on the COOL menu (see „Menu guide“ on page 18).
4.
The value must be in the range of –13 to –16 °C.
5.
If the value is not reached, please check that the cooling limit is set to
–16 °C.
6.
Retry the test and press quickly twice the
Ú
button after 5 minutes
with out displaying the error message.
7.
If you change the cooling limit, you must perform a new calibration
after this test.
Prerequisites
Process
