Application
Designed for level measurement of liquid non-crystallizable media (including petroleum products and LPG) and conversion of readings into unified current signal 4 – 20 mA and (or) digital encoded signal based on HART protocol.

Can be used in automation systems of oil, gas, chemical, foodstuff, municipal and other industries.

Main operation sites:

petrol stations, tank farms, refineries and other hazardous production sites requiring application of explosion-safety equipment
industrial automation systems of the food and chemical industries, municipal service
Features
modification with explosion protection type “intrinsically safe electric circuit”, level “ia” and explosion protection marking 0Ex ia IIB T5 Ga X
shock-resistant housing made of aluminum alloy or corrosion-proof steel
explosion-proof modification
easy operation and commissioning
transport modification for mobile tanks including naval and riverine vessels
various types of mounting devices for protective cable sheath (metal hose conduit, armored cable, pipe)

Description
Housing is manufactured of aluminum alloy AlSi7 (analogue of AlSi7Mg) with oxide fluoride electro conductive coating; housing is powder-coated (housing can be manufactured of corrosion-resistant steel EN 12Cr18Ni9Ti (cast housing), 12Cr18Ni10Ti (welded housing) on order). External and internal grounding clamps, single or two cable entries. Fitted with mounting devices for cable protective sheath of various types on order. Electronic board with terminals for connection is enclosed within, they can be accessed through removable cover.

Mounting is manufactured in accordance with Customer’s’s request.

Electronic board with magnet-sensitive contacts (reed switches) is installed within the guide pipe which is made of corrosion-resistant steel 12Cr18Ni10Ti. Float with magnet travels along the guide pipe with the rising medium level, thus closing reed switches.

The continuity of measurement with 5 mm step is reached by installation of reed switches in a row and their connection with resistors using the diagram of a resistive voltage divider with its circuits connected to the controller unit board.

Specifications
Guide pipe length, mm from 100 to 6000;
from 100 to 2500 (transport modification)
Liquid level measurement step, mm 5
Acceptable main inaccuracy of level measurement (for current signal 4 - 20 mA) ±5 mm or ±0.15 (±0,1) % of the output signal range (higher value is assumed)
Temperature inaccuracy, % / 10 °С 0.2
Monitored media features: temperature, °C from -50 (only for non-freezing media) up to +100 (up to +125 - as per Customer’s request)
pressure, MPa, not more than 2.5
density, kg/m³ from 450 to 1500 (gasoline, diesel fuel, LPG, petroleum, kerosene, odorant, etc.)
Upper / lower non-metering areas, mm, not less than 50 / 50 (depends on a float type)
"Dry" contacts output features 1): switchable voltage, V from 0.05 to 42
switchable current, mA, not more than 0.5
switchable power, W, not more than 9
Temperature for operation, storage and transportation, °С from -50 to +60
Water and dust ingress protection degree as per IEC 60529 IP66
Explosion protection marking Ga/Gb Ex db IIВ ТЗ; Ga/Gb Ex d IIВ ТЗ; 0Ex ia IIB T5 Ga X
Output signal 4-20 mA
Power supply voltage (Up), V from 9 to 42 (up to 30 – for explosion protection 0Ex ia IIB T5 Ga X)
Reverse polarity voltage protection available
Mean time between failures, hours, not less 50000
Weight, kg, not more than 25
Average lifetime, years 15

Note.
1) Usage of relays, condensers or filament lamps as electric load is not acceptable