FAQs

The most common frequently asked questions are listed below. Click on each + sign for more information.

A feature in the software is the Conversion function, this can be found in the maintenance section.

From the Main Menu->Maintenance->Sensors->Conversion->pH sensor->pH->

Column 1 Column 2
Conv Raw reading from probe in this case 0.0mv
Slope -59.16mv
Offset How far from 0mv ideally less than +/- 30
Reading Is the pH value being read in this case 7

When measuring pH, the slope factor at 25 °C has a value of -59.16 mV. This is termed the theoretical slope. It follows that for a unit change in pH, an ideal measuring system will sense a mV change of -59.16 mV. This measurement of slope factor gives an indication of the performance of the electrode system. If electrodes are not cleaned after use, and are subject to long term neglect, then the accuracy of the system is lost. This loss of performance can be monitored by a steady decrease in the measured slope value of the system.

When the slope value drops below -50 mV per pH unit at 25°C (85 % slope efficiency) or drift of the offset exceeds ± 30 mV, extensive reconditioning may return the electrode to the level of expected performance, but a change of electrode may be necessary to ensure accurate pH measurements.

However, it should be remembered that factors such as reference junction blockage, electrolyte loss, glass bulb contamination and use of incorrect calibration buffers will all contribute to ‘low slope values’.

All of these must be considered when there are doubts about the performance of the pH system.

Pre v1.33 used for setting input current loops

The minimum and maximum settings can be set for parameters.

From the Main menu; Setup-> Sensors->pH sensor-> pH ->

select Min and use the left/right arrow keys to select the required digit, use the up and down keys to select the desired value and press OK when done.

select Max and use the left/right arrow keys to select the required digit, use the up and down keys to select the desired value press OK when done.

This article has been added as it has come to our attention that customers are using the Master Reset function instead of the Factory reset function when trying to isolate faults within the system. The two methods of reseting the device to a known state are shown below. The amount of information that is cleared and reset back to a known state is also listed for each method.

Master Reset

Removes Device Codes, Configuration, Settings and Firmware from the unit . This will leave the unit unable to function. The unit will require a full install of Firmware and Device codes.

Factory Reset

Removes User defined Settings, calibration information and Configurations. Device codes and software are left in tact. Unit will function as if it had just left the factory.

Master Reset not available in version 1.30 or higher.