The most common questions about the TRUEscience system and pH measurement are shown below.
A. You should calibrate the sensor at the start of each day with the TRUEscience buffers.
You can calibrate using 1, 2 or 3 buffers depending on the accuracy you require. A 3 point calibration is suitable for most applications.
A. You need to calibrate to determine and correct for electrode response, to ensure accurate results.
The performance of a pH electrode can change rapidly so calibrate frequently to allow for changing conditions – once a day is recommended.
For more information on calibration see our blog post here.
A. The probe and the buffers should be at a similar temperature before starting. Allow them to reach the same temperature before you begin.
A small amount of drift is normal and simply means that the pH electrode is reading the solution constantly – movement of 0.01 pH or so is perfectly normal (e.g. reading 7.01, 7.00, 6.99, 7.00…)
If you are seeing large variation of 0.5pH units or more then your electrode may be damaged. Recalibrate and see if this improves the results. If not you may need to revive or replace the electrode.
A. Yes the TRUEscience SMART Cap is a truly open system and will accept any electrode with an S7 connector.
If you need a flat tipped probe or a special probe for TRIS buffers you can buy any electrode that has an S7 connector and it will easily fit the SMART Cap.
A. The range can vary with the terrain but the tablet and probe should communicate from up to 30m away.