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Logging RH without Temp

The Bluetooth-enabled HOBO MX1101 and HOBO MX1102 loggers both use a Relative Humidity sensor that returns a temperature-compensated RH measurement.

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Wiring Multiple 4-20mA Loops with a Single Power Supply

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How to configure differential pressure for bidirectional scaling

Set the PXU sensor to Bidirectional mode by moving the jumper to BI, as described in the attached manual.

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How to deploy a data logger in turbulent water

See image for a quick deployment idea for an underwater logger, such as the HOBO Water Temp Pro v2 or the HOBO U24 Conductivity logger.
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Water Level Quick Test

Please see attached document

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Barometric Compensation Method

Barometric Compensation Method - Technical Details

This section presents the details of how the Pressure values are computed, and how Pressure and Temperature values

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Measure Direct Current with the HOBO RX3000 and the T-VER-H971 Transducer

To measure Direct Current using the HOBO RX3000 and the T-VER-H971 transducer, see attachment.

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HOBO U20 Stainless Steel Data Logger - sensor location

See attached diagram for sensor location in HOBO U20 stainless steel data loggers.

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HOBO UX120-017: Dry contact, channel voltage.

When the switch is closed, low voltage (0V) is detected. When the switch is open, a 100K pull-up resistor brings the processor input pin to 3.3V.

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HOBO MX110X buzzer decibel (dB) output

The buzzer decibel (dB) output of the HOBO MX1100 logger series is 65 dB to 75 dB, depending on battery level.

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