Analog Tensiometer

• Continuous, long term follow-up of soil moisture changes with no need of physically being on site.
• Viewing data anywhere, any time, by various devices, Such as P.C. Smartphones, Tablets etc.
• Optional Automatic irrigation start/stop according to soil water condition.

Ami-Tens` Analog sensors are using standard electronic outputs (4-20mA or 0-2V), which are compatible to most monitoring or control systems available in the market.

The device`s body – it is the same as all Ami-Tens` tensiometers, whereas beneath the transparent window there is a TEE connector in which the Analog Transducer is screwed.

On top of the device there is a screwed cap for refilling water.

The Analog Vacuum Sensor (Transducer):

Its body is a stainless steel Cylinder ( L=6cm or 10 cm, D=2 cm), with a G1/4" threaded connection.

Electro-Mechanical details

• The Transducer converts Physical values (water tension) to electrical standard outputs.
• There are 4 basic models, differing from each other by the output mode and the measuring range:

For most mineral soils:

1. 4-20mA output, range of 0-100cb.
2. 0-2V output , for range of 0-100cb.

For soilless media or sand :

1. 4-20mA output, for range of 0-20cb.
2. 0-2V output, for range of 0-20cb.

Measured changes of Currency or Voltage outputs are proportional to changes of water tension and thus, reflect the changes of soil moisture levels.

Operation Power:

For 4-20mA models: 10-24V  for 0-2V models : 3-12V (with Voltage stabilizer)

Temperature compensation: Between 0-70C0
Length of cable between the sensor and the Logger– up to about 200 M.(2 wires)

General remarks:

1. The top cap, using for for water refill, must always be hermetically closed.
2. In order to prevent algae growth we recommend to add a few drops of liquid home Chlorine solution to the pipe, or, alternatively, cover the transparent part by an Aluminum foil or other materials.

Options with special orders:

• To use with an angular tensiometer for shallow media.
• An additional Mechanical gauge, instead of the top cap, for on site readings.