Soil moisture-measuring instrument

Lumbricus

The precision soil moisture measuring instrument is used for monitoring/controlling the soil moisture.
Applications: Long-time control of landfill seepage barriers Agriculture Hydrology Civil engineering Meteorology
	Lumbricus taking measures on waste dump near Zurich

	Lumbricus installed in rainproof case

This instrument uses the method of measuring permittivity.

A probe is sunk 2.5 m deep into the soil through a measurement tube. The profile of the soil moisture is measured with a resolution of 10 to 20 mm.

The measurements are automatically identified with measurement tube number, measurement time, and date.

Up to 100 measurements can be stored in the instrument.

The final computation on a PC (Win95/98)
screendump of the software program: humidity profile at June 26, and one (rainy) day later --> more measuring examples

Specifications:

Independently of the soil structure the measurement accuracy is 1.5%

Calibration:

After the measurement tube has been sunk, the soil around the measurement location is frozen with liquid nitrogen and a calibration measurement is taken. The data are used to compensate for the soil structure. If the high accuracy is not needed, the nitrogen calibration can be omitted.

Operation:

The probe is mounted on the measurement tube in the field and plugged into the instrument inside the carrying case. When the corresponding command button is pressed, the probe automatically descends inside the tube and returns to the starting point. The data (measured values, measurement time, date and measurement tube number) can subsequently be evaluated in a PC.

Measurement tubes:

Fibrous-glass reinforced plastic tubes, diam. 127 mm, with fittings for sinking by means of an electro-pneumatic hammer. Lengths 1.25 m, 1.65 m, 2.5 m.

mounting of a measurement tube by use of an electro-pneumatic hammer in Detail

Accessories:

• Carrying case for probe, control unit, cable and charging unit
• 10 m probe connection cable
• Measurement tube 1.25 m /1.65 m / 2.5 m
• Sealing plug and cover for measurement tube

Electrical requirements

Operating voltage: 12 V rechargeable battery for autonomous operation up to several weeks and 100 measurements.

Battery rechargeable with mains adapter.

Dimensions, weight:

Carrying case, empty: 480x290x460mm 7.8 kg

Electronics: 170x130x350 mm 2.5 kg

Measuring unit: 225 D 390 H 4.8 kg

Special versions

If required we can customize the hardware and software for your application.

As a service Meteolabor AG will install the measuring tube, put the instrument into operation and perform the calibration

You can download the datasheet in pdf format:
		download free Adobe Acrobat Reader

1/2000, Meteolabor reserves the right to make changes without further notice

Lumbricus Directory: [tubemounting] [calibration] [sonde] [measuring examples] [Forschungszentrum Karlsruhe about Lumbricus]

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