Jenway 3540 - Manual (Page 65)

Section 7 Measurements
7.1
pH and Conductivity Measurement
Following successful calibration of one or both channels, measurement is simply
carried out by immersing the relevant electrodes in the sample and taking the reading
when a stable endpoint is reached. Remember to rinse all the probes with deionised
water between samples and blot off any excess with clean, soft tissue before
immersing in the next sample.
When measuring both pH and conductivity just two probes are necessary as the
temperature sensor in the conductivity probe can carry out the ATC function for the
pH channel. When measuring pH alone the separate ATC probe will be required if the
conductivity probe is not immersed in the same sample.
Each channel has its own endpoint indicator and the reading for individual channels
should not be recorded until its endpoint indicator is displayed.
A typical measurement screen with both endpoint indicators displayed
Results can be stored in the internal memory using the powerful data logging
functions, see section 3.3. Simply pressing the Store [STO] key will save the result to
the next available location along with the date, time and any batch code entered in
the set up menu. Alternatively the data logging function can be set to automatically
store or print the results when the endpoint indicator is displayed saving any
intermediate key press between samples.
An example screen of stored results
To review stored results use the right or left arrow key to highlight the Results tab.
See section 3.3 for details of the alternative actions that can be taken when the
memory is full and for the various functions of the clear [CLR] key. Results can be
transmitted to a PC by pressing the print key.