Note: These instructions apply only to replacement temperature probes manufactured by Ralston Instruments.
Temperature Probe product information page: PT100 IEC Class A RTD Probe with M12 connector.
Remove the old probe and install the replacement probe on the gauge.
Power on the gauge and connect it to a computer running FieldLab Desktop with the provided USB cable.
Link the gauge to FieldLab Desktop if you haven't already done so.
Follow on-screen instructions in FieldLab Desktop to link your gauge.
Select the device you want to pair to the new probe from the Devices screen.
![](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/select-tx-device-from-devices-screen.png?mtime=20201218144112)
Select the Sensors tab.
![](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/select-sensors-tab-tx-gauge.png?mtime=20201218144417)
Select the Pair New Probe button.
![Select Pair New Probe Button Select Pair New Probe Button](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/select-pair-new-probe-button-tx-gauge.png?mtime=20201218144608)
Sign in to your FieldLab account.
If you don't have an account, select the sign-in link and create one.
![](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/sign-in-fieldlab-account-to-pair-probe.png?mtime=20201218145115)
Select the Pair New Probe button
![](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/select-pair-new-probe-button.png?mtime=20201218145347)
Locate the serial number on the new temperature probe.
It is the number at the bottom, listed below the product number.
It is a seven digit number laser etched into the side of the probe near the tip.
![](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/TX-Probe-Serial-Num-Location.png?mtime=20201221151444)
Enter the serial number of the new probe. It is a seven digit number, with a dash between the fourth and fifth numbers, laser etched into the side of the probe near the tip.
![](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/enter-sn-for-new-probe.png?mtime=20201218150116)
Select Next
![](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/select-next-after-entering-serial-number.png?mtime=20201218151221)
Confirm that you want to pair by selecting the Pair New Probe button.
![](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/select-pair-new-probe-button-2.png?mtime=20201218153030)
Select the Done button once pairing is complete.
![](https://s3.amazonaws.com/assets.ralstonfieldlab.com/images/png/pairing-complete-tx-probe.png?mtime=20201218153446)