Here is how we recommend dealing with a home-made sensor in Logger Pro 3.x.

First go to Set Up Sensors and set the analog channel for a “Raw Voltage” sensor. Now, staying in the Set Up Sensors dialog box, click on the sensor and choose Calibrate. Go to the Equation tab of this Sensor Setup dialog box. Change the units to whatever units you want. If you want to enter a slope and intercept for a calibration you can do it in this same tab. Click Apply. If you prefer to calibrate manually, you can do that by clicking on the Calibrate tab and going through a two point calibration.

Now go to the Calibration Storage tab of the Set Up sensor dialog box and choose Experiment File for the calibration retrieval preference. The idea is that you are making a custom calibration that you want stored with this experiment file. This will mean that in the future any time you open this experiment file, you will have this same calibration. This is much in the spirit of the LP 2 way of doing things, before auto-ID sensors.

This should take care of everything except the name of the column. To change this, close all the dialog boxes and choose Column Options/Potential from the Data menu. Change the Name and the Short Name to anything you want.

If your new sensor readings are not set up to show up on the graph, click on the left axis of the graph and set up the column.

Here is an optional refinement: You may want to go to File/Settings for… and uncheck the box labeled Confirm Sensor Configuration. If this box is checked, each time the file is opened you will get a dialog box asking you about the sensors and suggesting that you have a Raw Voltage Sensor. All you have to do is click OK and all is well. If you uncleck the Confirm Sensor Configuration box, you will not get the confirmation dialog box.

Save your experiment file. When you want to use this custom sensor, open this file and you will be ready to collect data.