Thermo Scientific Dionex UltiMate 3000 Series, Operating Instructions Manual

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UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS
Page 144 Operating Instructions
Frequency What you should do...
Annually Recommended:
Have authorized Service personnel perform preventive maintenance once a year.
5.10.3 Calibration Intervals
Relevant only for the NC pump
The main reason for performing calibration is to correct shifts in retention time that may
develop over time. The NC pump uses extremely precise pressure transducers or thermal
flow sensors to control the flow rate and the gradients. Over time, such sensors can have a
small drift. When the drift is large enough, a small shift in retention times can be observed.
This does not mean that the instrument is broken. However, mind the following for the
pressure transducers and thermal flow sensors:
• If a Classic flow meter is installed, you should check and correct the offset of the
pressure transducers if required. To do so, run the
Pressure Transducer Test
( → page 172).
• If a ProFlow flow meter is installed, you should check and adjust the zero balance of the
flow sensors, if required. To do so, run the Zero Balance Test (
→
page 172).
As long as the retention times are stable and in the expected range, you should not interrupt
pump operation by recalibrating the pressure transducers or thermal flow sensors.