Tech Notes and Wiring Diagrams
Wiring Diagram - Monitoring DC Voltage and Current with the H22-001 Energy Logger
Linked is a drawing that shows how to monitor DC voltage and/or current using the H22-001 Energy Logger via the S-FS-CVIA Analog Module. For DC current monitoring, the T-VER-H971BP-200 DC Current Transducer is needed also.
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Wiring Diagram - Monitoring 480V, 3-Phase AC Voltage and Current with a HOBO H22-001 Energy Logger
Linked is a wiring diagram that shows how to use CTs and PTs with the HOBO H22-001 Energy Logger via the S-FS-TRMSA Module. The image shows a 480 V, 3-phase application. The configuration would be similar for single- or split-phase applications.
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Wiring Diagram - HOBO H22-001-S-FS-CVIA Voltage Input Logic Switch
Linked is a wiring diagram that shows how to monitor switch closures with a HOBO H22-001 Energy Logger fitted with the optional 2-channel analog input module S-FS-CVIA
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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 linked 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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Smart Sensor Sampling Interval
When a sampling interval is configured, the station or logger will take multiple measurements within a given logging interval and then average them together to create a single logged data point.
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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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Sample Data - Missing Smart Sensor -888.88 Error
Linked is a screenshot that shows the HOBOware error values displayed when a smart sensor is disconnected from a smart sensor-compatible logger, specifically the HOBO H21-002, U30, and H22-001.
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Sample Data - HOBO U30 Station Monitoring Soil Moisture, Leaf Wetness, and Soil Temperature on a Green Roof
Linked is a screenshot from a HOBOware data file recorded by a HOBO U30 Station that recorded soil moisture, leaf wetness, and soil temperature as part of a green roof project.
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Sample Data - Energy Consumption, Indoor & Outdoor Temperature - HOBO H22-001 Energy Logger
Linked is a screenshot from our HOBOware Pro software that depicts data recorded by the HOBO H22-001 Energy Logger over a 24-hour period, in a residence.
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Rapid battery consumption (outdoor loggers)
Troubleshooting for Rapid Battery Consumption (outdoor loggers)
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Protecting data loggers from electrical discharge (ESD)
A discharge of static electricity may cause a running data logger to stop recording.
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Possibility of exposure to chemicals or chemical vapors
This is dependent on the data logger you are using and the chemical and/or concentration of the chemical to which the data logger is exposed.
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Maximum sensor cable length
The entire network (all sensors combined) cannot exceed 100 meters. As long as your total cable length is below this, it does not matter how you designate the individual cable lengths. It is important to insure that the connections are weatherproof.
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Logging Duration in the Launch Screen - What Does That Mean?
In the HOBOware and HOBOmobile Launch screens there is a number that is presented as "Logging Duration". This number is not how long the battery will last!
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Logging duration calculation table
Logging duration calculation table
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Logger power failure and data loss
How to deal wihg logger power failures and data loss
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H22-001 grounding
H22-001 grounding
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Data loss and recovery
There are two common reasons for data loss
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Data logger is shutting off prematurely
A discharge of static electricity may cause a running data logger to stop recording. Precautions should be taken to prevent this while handling the data logger. Discharges may occur when there is a charge difference between the data logger and a cable being connected to it or when a person touches an exposed jack.
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Data Assistant Videos on YouTube
Linked are Data Assistant Videos on YouTube
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Boosting mV outputs to 0-2.5 DC outputs for use with HOBO stand-alone data loggers
Simple non-inverting op-amp amplifier circuit - how to boost mV to 0-2.5V DC.
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A quick temp-accuracy check (ice bath)
We receive many calls requesting information on how to calibrate our data loggers. While our data loggers cannot be calibrated, you can certainly check to see if the data loggers are recording within their specifications.
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3-phase Wattnode product comparison
3-phase Wattnode product comparison
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-888.88 Data Values
Problem: My Smart Sensor data shows a -888.888 for a good portion of the data file.
-888.888 means that the logger cannot get a response from the Smart Sensor (after launch)
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Working with HOBO data loggers for Energy Logging
This course makes the participant familiar with the various Onset products that are available for monitoring electrical energy. It includes discussions of various measurement techniques, logger installation examples by a master electrician and detailed electrical safety information as well.
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