The computer is designed to measure, convert, calculate and store data on the parameters and quantity of water and other liquid media, including oil products, as part of the commercial and technological accounting assemblies
The computer converts the output signals from flow meters, temperature and pressure sensors to the flow, pressure and temperature values, calculates and maintains a commercial accounting of the gas amount under operating and standard conditions.
The physical principles of the flow measurement methods using one or another converter are not important for interfacing with the Irga-2 computer.
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Together with it, any converter with an output signal of current strength of 4-20 mA or with an output impulse-number (frequency) signal with a pulse repetition rate of up to 5000 Hz can be used.
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Hourly, daily and monthly parameter archives are kept.
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Archive depth:
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hourly - up to 1 year
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daily - up to 1 year
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monthly - up to 3 years.
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Data is output to the matrix printer via the LPT port (CENTRONICS).
Key features
The computer allows:
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adjustments using a computer to the required accounting schemes;
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enter and/or edit the settings of the primary transducers of the measuring assemblies and their types, determined by the principle of measuring flow, temperature and pressure.
During operation as part of the gas meter, the computer provides for each channel:
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instantaneous measurement of temperature, pressure, differential pressure or flow rate by converting electrical signals from the corresponding sensors;
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calculation of the flow rate and amount of the operating medium;
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archiving of hourly, daily, monthly values of quantity and parameters;
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output to the liquid crystal indicator (LCD) of the front panel of the measured, calculated and stored parameters;
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protection of settings values that affect accounting from unauthorized changes;
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maintaining the calendar and time of day;
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self-diagnostics and sensor diagnostics;
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indication of normal computer operation;
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indication of archiving mode - on or off;
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archiving of time of power outages, time of emergency situations and cases of interference in the computer operation;
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saving settings and archive values during power interruptions.
The computer measures, calculates, stores and displays the following information on the LCD screen (depending on the accounting conditions):
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current date and time, hours and minutes;
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channel number;
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current, monthly, daily, hourly average steam pressure in pipelines, MPa;
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current instantaneous differential pressure, kPa;
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current, average monthly, daily average, hourly average value of carrier temperature in pipelines, °С;
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current temperature of cold (make-up) water, °С;
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current flow rate under operating and standard conditions, m3/hour;
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hourly, daily and monthly gas volumes under operating and standard conditions, thousand m3;
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cumulative total gas volume for the measurement period under operating and standard conditions, m3;
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current instantaneous values of the returned condensate flow rate, m3/hour;
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hourly, daily and monthly volumes of returned condensate and its total volume on an accrual basis for the entire measurement period, m3;
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hourly, daily and monthly amount of released (received) thermal energy and its total cumulative value for the measurement period, Gcal;
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current value of thermal power, Gcal/hour;
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current mass flow rate of steam, air, t/h;
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hourly, daily and monthly mass of the released (received) steam and its total cumulative amount for the measurement period, t;
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total operating time and standard operating time of the counter, h;
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emergency operating time, h: using power, sensors, at a flow rate less than the lower set point;
The computer stores and displays the following constant-variable values on the LCD screen:
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gas density, kg/m3;
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qualitative and quantitative composition of gas (СН4, С2Н6, С3 Н8, i-C4H10, n-C4H10, i-C5H12, n-C5H12, C6H14, C7H16, N2, CO2, CO, O2, H2, He, H2S, H2O, unsaturated hydrocarbons in total);
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barometric pressure, mmHg;
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cold water temperature;
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calibration factors;
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contractual (substitute) flow rates under standard conditions (m3/hour);
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contractual (substitute) pressure and temperature.
The computer enables data exchange:
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with a local PC when wired via the RS-232 interface at a speed of 9,600 bps;
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with a remote terminal via wired communication lines using a modem or wireless communication lines using a radio modem.
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with other computers wired via the RS-485 interface with the Modbus RTU protocol (when equipped with the AS-485 adapter).
(More about integrating the computer into the control system...)
The computer is equipped with:
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non-volatile clock and memory, which allows storing information when the power is off;
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archives of data and all interventions in the operation of the meter;
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LPT-port for connecting directly to any EPSON-compatible matrix printer;
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graphic (128*64 pixels) liquid crystal display.