Flow Sensor / Pressure Transducer Diagnostics (Nc Pump); Performing A Zero Balance Test (Proflow Flow Meter); Calibrating The Pressure Transducers (Classic Flow Meter) - Thermo Scientific Dionex UltiMate 3000 Series Operating Instructions Manual

UltiMate 3000 Series:
NCS-3500RS and NCP-3200RS

6.6 Flow Sensor / Pressure Transducer Diagnostics (NC Pump)

6.6.1 Performing a Zero Balance Test (ProFlow Flow Meter)

Relevant only for the NC pump with a ProFlow flow meter installed
To ensure an accurate flow rate and solvent composition, the zero balance of the thermal flow
sensors and pressure transducers of the ProFlow flow meter must be calibrated from time to
time. Perform the Zero Balance Test to set the flow sensors and pressure transducers to zero.
To perform the test, navigate to the Control menu, select Diagnostics and then select the
Zero Balance Test. In Chromeleon 7, run the test from the NC pump Wellness page of the
ePanel set by clicking Adjust Zero Balance. A wizard guides you through the procedure.

6.6.2 Calibrating the Pressure Transducers (Classic Flow Meter)

Relevant only for the NC pump with a Classic flow meter installed
The NC pump generates the flow rate by applying a corresponding pressure drop at the
flow selector. To ensure an accurate result, the pressure transducers must be synchronized
very well. Run the Pressure Transducer Test to verify that the pressure transducer offset
is still correct. If it is not, calibrate the pressure transducers.
Before you begin: Observe the Tips and Information for performing the test further down
in the section.
1. In Chromeleon, open a control panel and connect to the timebase in which the module
is installed (→ page 89).
2. On the Control menu, select Diagnostics and then select Pressure Transducer Test
(in Chromeleon 7, run the Pressure Transducer Test from the ePanel, by clicking
Check Pressure Transducers on the NC_Pump_Diagnostics tab).
3. A wizard guides you through the procedure. Observe the following:
♦ When you run the Pressure Transducer Test after you have installed a new pump
head, you have to select the Calibrate Anyway check box in step 2 of the test (even
if calibration is not explicitly recommended).
♦ After calibration, the new value is stored automatically as the current value.
Tips and recommendations
• The pump will have the best stability when it has been powered on by the main power
switch for at least 24 hours.
Recommendation: Run the Pressure Transducer Test or perform pressure transducer
calibration after 24 hours or repeat the test or calibration after this period.
After shorter interruptions of the power supply (less than 8 hours), it is sufficient to wait
at least 1 hour.
Page 172 Operating Instructions