Understand the diagnostics and troubleshooting capabilities when using the Knick Stratos Evo. Learn about Sensoface, quick status indication, and error messages.

Troubleshooting Overview

We’re here at 50 West Brewery in Cincinnati, Ohio and today we’re going to show you some basic tips on troubleshooting your Knick Stratos Evo transmitter, as well as the connected Memosens pH sensor. The Stratos Evo provides intuitive diagnostics along with the multicolor backlit display that indicates the operating state of your measurement loop.

Error Codes

Errors are clearly indicated with the change in screen color along with the corresponding code in the bottom left corner. Here you can see that our transmitter is displaying Error Code 60. The screen has turned red and the display is flashing, indicating that we are in alarm mode. You can see details on the error code by pressing the info button on the face of the transmitter. Find further information and tips on fixing the issue in the error messages section of the transmitters manual.

Error code 60 indicates a load error on one or both of the analog outputs. To remedy this error, be sure to place a load on both outputs. If you’re only using one of the outputs, apply a jumper to the second output to rid this error on terminals eight and nine. Please note that both outputs share terminal nine. The accessory bag, which ships with the transmitter, includes jumpers.

Sensoface

When troubleshooting a Memosens pH sensor, the first place to start is the Sensoface on the main screen. A smiley face indicates that all is well with the health of your sensor. A neutral face indicates that the sensor should be attended to soon, and a frown indicates that the sensor needs maintenance or replacement. You may also notice additional icons on the main screen, further pointing to the issue at hand. Again, the Info button will assist you on what to do next.

Diagnostics Menu

To further troubleshoot the sensor, we will want to enter the diagnostics menu in the Stratos Evo. We will do so by pressing menu and then enter on diagnostics. Here we could see the specific diagnostics details on our connected sensor. Under Cal Data, items such as the sensor’s last calibration as well as its zero point and slope are easily displayed. “Sensor” provides us the make and model of the connected Memosens sensor.

Toggling to the right, you will see the monitor feature within the Diagnostics menu. Entering the monitoring menu, we will find a lot of useful information. Here we see the raw millivolt value generated by the sensor. R-glass provides the impedance value of the sensor. It’s important to note that if this value is zero, you could possibly have a broken sensor. You will also find the operation time this indicates the number of hours or days that the sensor has been in operation.

Next is the amount of wear on the sensor, followed by a very helpful lifetime calculator which indicates how much life the sensor has left. Lastly, if turned on during the configuration process, you will see the number of SIP or sterilization cycles that the sensor has been exposed to.

Conclusion

All of these values can be helpful to determine if you can clean, calibrate, and put your sensor back into service, or if you should replace your sensor instead. Thank you for watching. Following these tips will help to ensure that you have a healthy and reliable pH measurement, as well as getting the most life out of your pH sensor.