Gas-volume conversion device ELCOR-94

Gas-volume conversion device ELCOR-94

Product description

ELCOR-94 is battery powered electronic corrector, converting the gas volume to be flown through gas meter to referential conditions of pressure and temperature. For natural gas calculates the gas compressibility degree according to ČSN 38 5510. Measured values of temperature, pressure and operating volume and calculated values of standardised volume are stored into device memory. Record period is fully optional, which enables to the device to record measured values from the minimal period of one minute up to the maximum one-day period. Storage capacity enables to store up to 5800 records. The memory is backed up by the second lithium battery

Momentary as well as recorded values there is possible to view on display of conversion device or can be read to PC computer memory and further to process it in graphic or tabular form. The communication with PC is enabled via RS 232C channel or via infrared interface. The device also enables the communication with PC via modem.

The device is fully developed for battery feeding and its hardware configuration together with software equipment guarantees minimally 6  years of regular function without battery change. Although the device ELCOR-94 is fully valuable with battery feeding, it is also possible, at the frame of device configuration extension, to deliver the power supply and device can be fed directly from network.

The device is constructed for application into hazardous area with explosion risk of inflammable gases and fumes and it is therefore approved for these purposes by State Test Room Number 210 in Ostrava-Radvanice.

The Conversion Device is delivered with pressure sensor and temperature sensor. Conversion device together with sensors can be placed into ZONE 2 environment.

Overview and functions

Gas-volume conversion device ElCOR-94 calculates the low-frequency volume impulses from turbine, rotary or diaphragmal gas meters. It calculates flown operating volume from number of impulses and from gas meter constant. From the measured values of absolute pressure and temperature and from rated value of the compressibility degree of gas it is calculated from operating volume the standardised volume at referential conditions.

From the gains of operating and standardised volumes are determined the actual and maximal values operating and standardised flow rate [m3/hour].

In case of occurrence of some error status (e.g. the temperature and pressure are found out of selected range), the input impulses and also subsequently the volume converted to relative conditions are added to the value of meter of alternative operating volume, respectively to the value meter of alternative standard volume.

The information of momentary values of pressure and temperature of gas is gained from accurate measurement by pressure and temperature sensor as well. At the battery feeding the cycle of measurement is programmable at the range of 1-30 sec, at network version the momentary analogue values are scanned after 1 second. Approximately 90 days prior to the end of calculated or measured battery life the warning message appears and arises the necessity of its replacement.

Conversion device is equipped with archive for storing the records of the values of temperature, pressure, operating and standardised volumes. The records are displayed in hourly (if need be minute) and daily archives. Another archive is monthly archive, at which there are recorded the average monthly values at the range of the last 15 months. Also there are registered maximal and minimal operating flowages, temperatures and pressures.

In the memory of conversion device, specifically in setting archive are permanently registered the minimum of 150 interventions into the setting and configuration of the device. In status archive the are registered the last 100 important operating conditions. Limit values of measured quantities are registered in archive of the limits. The programming of ELCOR-94 can be read in menu of PARAMETERS and SERVICE DATA.

The conversion device has two diagnostic registers for control of operating condition.

The conversion device is equipped with standardised and operating volume impulse outputs and with error signalling output. For remote data transfer the device is equipped with serial interface RS 232C and with serial channel enabling the transfer via infrared head.

All necessary actual or stored data and parameters can be easily displayed by help of keyboard on two-line alphanumeric display. During the device configuration with feeding from network the display is permanently switched on and pressure and temperature measurement is performed continually with the period of 1 s. During the network failure the program passes over to the same way of servicing as during the battery version (display switching off, etc), because it is passed over to the mode of feeding from battery.

ELCOR-94 contains the circuits, which enable the communication with surroundings. Those circuits secure the galvanic separations of intrinsically safe circuits of ELCOR-94 from the environment. Proper communication can be performed by two ways:

  • a) by transfer via infrared light this transfer is realised through the transparent window on the front side of ELCOR-94 by enclosing the communication head;
  • b) transfer via interface RS 232C this transfer is realised by connecting the cable with standard connection for RS 232C; galvanic separation solves the internal circuits of ELCOR-94.

Technical parameters

Mechanical Parameters
Dimension (w x h x d) 190 x 175 x 90 mm
Weight max. 2,6 kg
Cabinet material Aluminium alloy
Environmental
Covering (according to the ČSN EN 60529)td> IP65
Operating temperature -20 °C to +60 °C
Operating position vertical
Protection from dangerous touch of life and lifeless parts by low voltage
In-explosive Design
Combined Protection Flash Safety "ia"and the Protection of type "nA"
Marking II 3G EEx ib nA IIB T3
Certificate No. FTZÚ 02 ATEX 0036
Using for explosion hazard atmosphere ZONE 2
Power Supply
Type of Feeding Battery LP-01 (lithium)
Feeding Battery Lifetime 6 years
Feeding Battery Status Indication Warning 90 days prior discharge
Power supply from external flash safety source JBZ-01
Internal back up battery Saft LSH 14250
Back up Battery Lifetime 10 years
METROLOGICAL PARAMETERS
Measurement principle PTZ conversion device
Marking of type approval TCM 143/95 – 1968
Marking of type approval
Standardised volume < 0.5 %
Temperature < 0.1 % of measured value (at the range of
-20 to +60°C)
Pressure < 0,25 % of measured value (at the range of
-20 to +60°C)
Operating volume 0 %
Grade of compresibility < 0,05 %
Operating flowage < 1 %
Standardised flowage < 1 %
Gas Volume Conversion
Volume conversion to the referential conditions According to ČSN 38 5510
Relative gas humidity φ=0
Calculation error including the determination of compresibility grade < 0,05 %
Compresibility grade a) according to AGA NX-19
b) constant
INPUTS
Temperature Input
Sensor type Pt1000
Range of measuring temperatures -20 to +60 °C
Input Accuracy ± 0,1 % of measured value
Cable External Diameter 5 mm
Cable Length 2,5 m
Probe Diameter 5,7 mm
Pressure Input
Input Accuracy ± 0,25 % of measured value
Measuring Range 20 to 100 % of rated pressure
Way of connection Sensor inside device, or optionally to 2,5 m of the cable
Input of operating volume meter
Error rate 0 %
No load voltage Approx. 5 V
Short circuit current Approx. 5 μ A
Internal resistance Approx. 1 MΩ
Impulse length ≥ 30 ms
Delay length ≥ 30 ms
Max. input frequency 1 Hz
Connection Twin-wiring
Cable 2 x (0,15 až 2,5) mm², shielded
Cable External Diameter 4,0 - 6,5 mm
IMPULSE OUTPUTS
Number of outputs 3
Kinds of outputs - operational volumetric
- standardised volume
- output of error message
Galvanic outputs separation 2,5 kV
Max. voltage 30 V
Max. current 30 mA
Impulse outputs - parameters (optional) a) group of impulses,
impulse widths of 2 ms or 25 ms
b) particular pulse widths of 50 ms or 2 ms
- the group and particular pulses are transmitted with the period of measurement
Error output Without error - unhooked
COMMUNICATION INTERFACE
Communication line RS232
Outputs separation galvanic
Communication protocol ELGAS
Communication speed 9600 (1200, 2400, 4800) Bd
Format 8 bitů, 1 stop, without parita
Power supply from host port
Cable connection into terminal
Max. cable length 15 m
Interface for infrared head (HIE-01)
Interface of serial communication IEC-1107
Communication speed 9600 Bd
Communication protocol ELGAS

Accessories

Standard accessories

  • Mounting plate
  • Basin for temperature sensor of the length of 100 mm
  • Lug on the pipeline line (direct or cross)
  • Lugs with strap for attaching the mounting plate on pipeline
  • service SW
  • user manual

Optional accessories

  • three-way tap DN3 PN100
  • infrared head HIE-01
  • telemetric power supply box TENAS-01

Contacts

ELGAS, s.r.o.

Semtínská 211

Ohrazenice
533 53 Pardubice

E-mail:
Tel.: +420 466 414 500

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