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VH400 - Low-Cost Soil Moisture Sensors Quick view

Reference: VH400-2M

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VH400 Soil Moisture Sensor Probe Specifications Power consumption: < 13mA Supply Voltage: 3.5V to 20 VDC. Dimensions See drawing. Power on to Output stable: 400 ms Output Impedance: 10K ohms Operational Temperature: -40ºC to 85ºC Accuracy at 25°C: 2% Output: 0 to 3V related to moisture content Shell Color: Red Voltage Output Curves: Curves, Piecewise...
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Reference: UA-002-64

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UA-002-64 HOBO Pendant Temperature/Light 64K Data Logger

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A miniature, value-priced, waterproof data logger for temperature and light monitoring applications; stores 52K measurements.  IMPORTANT INFORMATION Requires HOBOware software and either an Optic USB Base Station or a HOBO Waterproof Shuttle (U-DTW-1). HOBOware Pro is required when using the HOBO Waterproof Shuttle. See compatible items below.
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U7844 Four channel data logger with pulse and two-state Inputs
  • U7844 Four channel data logger with pulse and two-state Inputs

U7844 Four channel data logger with pulse and two-state Inputs

U7844
U7844 Four channel data logger with pulse and two-state Inputs
Data logger is designed to record from four binary inputs or from two pulse and two binary inputs.
The recording is performed in a non-volatile electronic memory. The data can be transferred to a PC via USB-C.

Datalogger inputs can be set up for four binary inputs or two binary inputs and two pulse counters.

In case of exceeded set limits alarms are indicated by LED, LCD and acoustically by built-in beeper.

The device includes Traceable calibration certificate with declared metrological traceability of etalons is based on requirements of EN ISO/IEC 17025 standard.

Quantity

Description
Technical data

Measured value
Two-state signal
Pulses


BINARY INPUT

Parameters of the voltage contact „L“ level input voltage:< 0,4 V(*);
„H“ level input voltage:> 2 V;
Minimum voltage applicable:0 V;
Maximum voltage applicable:+30 V DC
Parameters of the voltage-free contact Contact resistance in „switched-on“ state:< 10 kOhm;
Contact resistance in the „switched-off“ state:> 300 kOhm;
Contact voltage in the „switched-off“ state:ca 3 V;
Minimum state duration necessary for latching the state:1s


COUNTER INPUT

Counter parameters Range 24 bits (16 777 215), possibility of letting the counter overflow
Maximum pulse frequency configured for voltage input - max. 5kHz
configured for a voltage-free or open-collector transistor - max. 200Hz



GENERAL TECHNICAL DATA
  • Operating temperature: -20 to +60 °C
  • Channels: 4x binary input nebo 2x binary input a 2x counter
  • Memory: 500,000 values in noncyclic logging mode; 350,000 values in cyclic record mode
  • Recording interval adjustable from: 1 s to 24 h
  • Display and alarm refresh adjustable: 1 s, 10 s, 1 min
  • Recording mode noncyclic: - data logging stops after filling the memory cyclic - after filling memory oldest data is overwritten by new
  • Real time clock: year, leap year, month, day, hour, minute, second
  • Power Lithium battery: 3.6V, size AA
  • Protection class: IP20
  • Dimensions: 61 x 93 x 32 mm
  • Weight (including batteries): approx. 120 g
  • Warranty: 3 years



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U7844
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