The Measuring System "STRUNA"

The Measuring System "STRUNA" is certificated as means of measurement. The system is intended for continuous measurement of a level, density and temperature of nutritive and explosive liquids (gasoline, diesel fuel, kerosene, spirits, liquefied gas) in reservoirs, calculations of volume and weight of liquids according to calibration charts, measurements of a level of the water situated under petroleum products.
The Measuring System "STRUNA" is applied in the automated systems of the account of motion of petroleum products and liquefied gas on refueling and gas-filling stations and oil bases, and also in mobile measuring-calibration laboratories (MMCL).
The System “STRUNA” operates together with the Control Cash Register T&T POS

Technical possibilities of System.

• Precision remote measurement of parameters of fuel in reservoirs of the gas filling station;
• Calculation of volume and weight according to the calibration charts of reservoirs;
• Full automation of the account of motion of petroleum products at the gas filling station with the conjoint use with the systems of delivery;
• The automatic control of airtightness of single-wall and double-walled (with the liquid filler) reservoirs with the start of sonic and light signaling;
• Prevention of overbrims of fuel at filling of reservoirs by supplying operating signals on switching-off of pumps, start (switching-off) of the sound and light signal system;
• Displaying results of measurement and calculation of parameters on the autonomous indicator or (and) a printing of the information to a computer of the user on standard interface RS-232C, RS-485, USB;
• Metrological checking without dismantle of the equipment;
• Significant reduction of an idle time of the fuel filling station at transfer of change;
• Transmission of the information on measurements to a cellular telephone of user and to remote computer on GSM 900/1800;
• Transmission of the information on a condition of security and fire sensors of GSM device "KUPOL-AZS" to a cellular telephone of user on GSM 900/1800.

Technical characteristics of the system

Range of level measurement (without density), mm	from 120 to 4000
Range of level measurement (with “surface” density meter), mm	from 200 to 4000
Range of level measurement (with “submersible” density meter), mm	from 150 to 18000
Range of level measurement (for calibration of tanks), mm	from 0 to 4000 or from 0 to 9000
Margins of allowed absolute error in a range up to 4 meters, mm	±1,0
Margins of allowed absolute error in a range more than to 4 meters, mm	±2,0
T hreshold of sensivity, mm	±0,2
Exploitation temperature range of the Primary Converter of Parameters (PCP), centigrade degrees	from -40 to +55
Margin of allowed absolute error of temperature measurement, centigrade degrees	±0,5
Ranges of density measurement, kg/m 3 :
1 range (liquefied gas)	from 499 to 599
2 range (А-80)	from 690 to 760
3 range (А-92, А-95, А-98)	from 715 to 785
4 range ( diesel fuel )	from 810 to 880
Margins of allowed absolute error of density measurement ("surface."), kg/m 3	±1,5
Margins of allowed absolute error of density measurement ("submersible "), kg/m 3	±1,0
Signalling at presence of underproduct water at level (for fuel stations), mm	25
Range of underwater level measurement (for fuel stations), mm	from 80 to 300
Margins of allowed absolute error of water level measurement (for petroleum storage depots), mm	±2,0
Range of overpressure measurement, MPa	from 0 to 1,6
Margins of allowed reduced error of pressure measurement,%	±1,0
Quantity of controlled tanks (by 1 central part)	up to 16
Cable length from each reservoir to the operators' room, not more, m	1200
Parameters of control channels in a Control Unit:
power circuits (optosemistor)	~220V;( from 0,1 to 0,5A)
power circuits (dry contact)	~220V;( from 0,01 to 0,1A)
power circuits ( optosemistor )	=27 V ;( from 0,01 to 0,5A)
System feed	220V +10 -15 % 50 Hz ; 0,6А