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Digital Manometer for Tank Content Display
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LEO 5 CA offers a user-friendly way to re­present the pressure measurement at the bottom of a tank as the quantity of remaining liquid. At the push of a button, the micro­controller performs the calculations using the information of the tank shape and dimensions and displays the remaining tank content quantity on the clearly legible 5-digit LED display in the desired unit (litres, gallons etc.).

The unit is configured using a PC and the easy-to-use software so that the filling level, which determines the pressure, can be converted into an appropriate filling quantity. First the tank ­shape is selected, then the tank dimensions and the specific gravity of the liquid are entered. It contains the most current tank shapes. The program covers the most common tank shapes, but also enables any shape by entering the parameters into a specified table.

The exclusive use of absolute pressure sensors in the LEO 5 CA system eliminates the use of capillary vented cables with all the problems associated with a gauge pressure measurement. The LEO 5 CA housing integrates an air pressure sensor, ranged between 0,8 bar and 1,2 bar absolute. The sensors to measure the hydrostatic pressure at the bottom of the tank are calibrated from 0,8 to 1,8 bar abs for tanks up to 5 m in height, and 0,8 to 2,3 bar abs for tanks up to 10 m in height. The pressure difference, calculated by the micro-controller, is the relative hydrostatic pressure. The content of a pressurised tank is determined using the difference between the measurements from two absolute pressure sensors located at the top and bottom of the tank

An accuracy of the system of up to 2 mbar (corresponding to a 2 cm water column) is achieved using a computerised calibration and compensation procedure for the pressure sensors.

LEO 5 CA makes it possible to connect various pressure probe transmitter versions (with thread, front-flush with flange, or submersible sensors).

The power supply to the system (8 to 28 V) can be provided externally or internally from an accumulator or a battery. The display is obtained by pressing the button on the front, and the value appears for a configurable duration. The LEO 5 CA has two switch outputs with configurable functionality and threshold values. The device must be supplied externally if the switch outputs are used.

  • Custom software (Software update via serial interface)
  • Radio interface (Bluetooth) for measurements in inaccessible locations with transmission to PC and recording on PC
  • RS485 BUS interface
  • Record function / recording of pressure and temperature
  • Analog outputs 4…20 mA or 0…10 V
  • 2 switching outputs: PNP 0,5 A
  • External supply (8…28 VDC)
  • Customized front cover
Pressure Ranges -1…1 to 0…1000 bar
Accuracy ±0,05 %FS
Total Error Band ±0,1 %FS @ 0…50 °C
Interfaces USB, Bluetooth classic
Special characteristics All-rounder with Bluetooth
Display 5-digit LCD display
Reading capacity 56'000 measuring points
Sensor Interfaces none

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