An Analog Tensiometer, is principally identical to any other Tensiometer, with one major difference: Instead of having a mechanical gauge there is an Electronic Vacuum sensor which we also name Analog Transducer, that transmits, via cable, vacuum readings to a computerized monitoring or control system.
Continuous, long term follow-up of soil moisture changes with no need of physically being on site.
Viewing data anywhere, anytime, 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.
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:
a) 4-20mA output, range of 0-100cb
b) 0-2V output, for range of 0-100cb
For soilless media or sand:
c) 4-20mA output, for range of 0-20cb.
d) 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.
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)
a) The top cap, using for water refill, must always be hermetically closed.
b) In order to prevent algae growth, we recommend adding 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 onsite readings.