Water-Detect Feature in the HOBO MX2501 pH Logger is Not Working

The HOBO MX2501 pH logger's battery-saving water-detect feature is only guaranteed to work in water with at least 100 µS/cm conductivity. The water-detect nodes rely on the water closing the circuit...

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...

Wiring Diagram - Monitoring Three-phase Energy using the HOBO H22-001 Energy Logger and the Wattnode kWh Transducer

Attached is a wiring diagram that shows how to connect a Wattnode kWh Transducer to a HOBO H22-001 Energy Logger to log energy consumption in a 3-phase circuit. Note:

Cellular (GSM) Amplifier/Repeater/Extender

Below is a link to a cellular signal amplifier/repeater that may help improve mobile phone signal strength for HOBO RX3000 3G systems. Note that this has not been tested or endorsed by Onset...

Mounting the MX2301 into the RS1 Radiation Shield

See how to unpack and install the HOBO MX2301 Bluetooth Temp/RH logger into the RS1 Radiation shield

HOBO Waterproof Shuttle U-DTW-1 indicator lights

Green “OK” LED illuminates when: HOBOware recognizes i

MX2001 - Submersion of Upper Portion of the Logger

The top part of the HOBO MX2001 logger includes a barometric-pressure sensor and its associated sensor port. If the port is submerged, the logger cannot provide accurate water level measurement, as...

HOBO Waterproof Shuttle Battery Replacement

Learn the proper way to replace the batteries in your HOBO Waterproof Shuttle, p/n U-DTW-1 For a detailed on-line training course on the Waterproof Shuttle please got to: http://www.onsetcomp...

Build Your Own Thermistor

For instructions on how to build your own thermistor, please see attachment.

Drying a wet circuit board

If possible, remove the board from the case and the battery from the board. Dry the board completely using a hair dryer. If the board was exposed to salt water, rinse the board with fresh water and...

Charging a very low HOBO RX3000 or U30 battery

As mentioned in the HOBO RX3000 and U30 documentation, if the battery voltage is allowed to drop too low, it may not be charged within the logger. In these cases, the battery must be charged with...

Wiring Diagram - Monitoring Energy with a UX120-017 and T-VER-E50B2

Attached is a diagram that shows you how to use a T-VER-E50B2 Power and Energy Meter and UX120-017 data logger to monitor energy in a 3-phase circuit. Warning: Installing transducers in an...