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The AN4020 is a 4-20mA loop powered indicator with battery backup. This level indicator provides a local level reading at the tank whilst at the same time supplying a 4-20mA signal. In the event of the 4-20mA loop power being lost, a local reading of the tanks contents can be obtained by pressing a button.
Features
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Easy installation into existing underground and above ground water tanks
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4-20mA loop powered.
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Backup battries to provide local level indication if 4-20mA power is lost.
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Local level indication at the tank whilst providing a 4-20mA signal to remote location
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Very accurate, easy to read analog level display
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Weatherproof and tough UV resistant enclosure
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Supplied with 10m sensor cable that may be extended to 100m from tank**
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No maintenance, high reliability level sensor
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Suitable for levels to 4m (AN4020-10 suitable to 10m)
How does it work?
The level probe is suspended from the top onto the bottom of the tank. The AN4020 level sensor uses the latest technology to sense the pressure of the water above it. The pressure is converted to an electrical signal and then transmitted through via the cable to the display unit. The level is displayed on a meter dial on the display unit as a percentage of the maximum depth. At the same time a 4-20mA signal is transmitted. In the event of the 4-20mA loop power being lost, the level at the tank can be obtained by pressing the button on the AN4020. The internal backup battries are used to provide power so that a reading can be obtained at the display.
Specifications
Dimensions of the display unit: 115(W) x90(H) x57(D)
Dimensions of the level sensor: 140mm (Length) X 25mm (Diameter)
Standard sensor cable length: 10m
Power Source: 4-20mA loop power. (12V to 36V DC)
Level display: Analog display in % of maximum depth
Depth range: 4m (optional 10m)
Warranty: 12 months
Notes:
* Battery life is estimated based on taking a 10 second reading every day.
** Using the optional ANJ420 vented junction box.
Any 4 core cable can be used to extend the sensor cable.
Use the vented junction box to connect the extension cable to the sensor cable.
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