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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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Smart sensor cable fix

Problem: My smart sensor data shows a -888.888 for a good portion of the data file. Note: -888.888 means that the logger could not find the smart sensor after the logger was launched successfully.
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U30 and excitation wiring with S-VIA-CM14 modules

Here is a wiring diagram for use with external sensors and the S-VIA-CM14s. Remember the excitation current required to power the external sensors cannot exceed 50 milliamps total. http://www.onsetcomp.com/files/U30%20VIA%20and%20S_VIA_CM14.JPG
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