OSMOMAT 050 User Guide
Page 39 of 51
Version 1.1 (2011-10-12)
8.4 Internal Quality Control of the OSMOMAT 050
A microcontroller monitors the unit’s functions based on the program flow. The failure of individual
functional groups in the unit results in a malfunction that either triggers an error message or shuts
down the unit.
If checks are to be performed, reference solutions can be produced as follows:
1)
Mixing heparinized pool plasma of a larger number of healthy patients
->
Resulting osmotic pressure should be 25 mmHg +/- 2
2)
Dissolve 5% human albumin in a physiological saline solution
->
Resulting osmotic pressure should be 19.5 mmHg +/- 2
8.5 Replacing a Defective Power Fuse
Before replacing a defective power fuse,
unplug the unit from the power supply! Risk of
electric shock!
To replace the fuses, use a small screwdriver to remove the fuse holder on the rear of the unit. The
two fuses can now be replaced. The unit has two-phase protection. Use the following fuses:
230V power supply:
0,25A slow/LAG
115V power supply:
0,5A slow/LAG
One set of fuses is included with the standard accessories.
8.6 Forfeiture of Measurement System Warranty
To protect the highly sensitive pressure transducer from overpressure during cell preparation, the
pressure ratios in the measuring cell and at the pressure gauge have to be continually monitored. This
requires the OSMOMAT 050 to be switched on. If the pressure reaches a critical point which could
result in damage to the measurement system, an audible warning signal is given.
Mechanical damage to the pressure transducer is excluded from the warranty service!
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