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Using the pHionics STs pH Sensor with a HOBO RX3000 Station
This application note describes how to connect, calibrate, and operate the pHionics STs pH sensor with the HOBO RX3000 station.
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An alarm was tripped on my MX logger. How do I clear it?
Visual alarms are cleared based on the settings selected under “Maintain Visual Alarms Until” when configuring the logger.
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MX logger is listed in the wrong group. How can I change that?
- Connect to the logger, tap Configure, and then tap Group.
- Select a group for the logger or create a new group.
- If you do not want the logger to be listed in any group, th
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Judd Communications Snow Depth Sensor with the U30 Remote Monitoring Station
Check out the attached PDF to find out how to use the Judd Communications Snow-Depth Sensor with the HOBO® U30 Station.
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Stainless steel loggers and salt water
Following is an important application note regarding the deployment of the following products:
U20-001-01 – HOBO Water Level Logger
U12-015 – HOBO U12 Stainless Steel Temp Logger
U12-015-02 – HOBO U12 Stainless Steel Temp Logger with 5” probe
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Installing Onset soil moisture sensors
Use the attached guide as a reference when deploying soil moisture Smart Sensors.
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U12 input impedance
This note looks at input impedance characteristics of the HOBO U12 loggers with external inputs. "Rs" and "VA" in the attached diagram represent your source impedance.
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Verifying RH accuracy on HOBO data loggers
Testing the accuracy of relative humidity sensors requires carefully-controlled conditions and a considerable amount of time. Please see the white paper Testing the Accuracy of Sensirion Relative Humidity Sensors in HOBO Data Loggers for complete details on the recommended procedure to follow.
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Connecting a 4-20mA to an external input
The 4-20mA cable (CABLE-4-20mA) measures currents from 0 to 20.1mA. The cable must be connected such that the current flows through, and with the proper polarity, as shown in the diagram. (Do not expose to current above 20mA or negative current.) Do not cut off the end of the gray cable where it connects to the blue and yellow wires, as this contains the precision resistor required for current measurements.
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