Elster EK220 Gas Volume Converter

The EK220 is a battery-operated volume converter. The device records the low frequency operating volume pulses of a gas meter, measures the operating pressure and temperature of the gas and calculates the compressibility K as well as the conversion factor C. The standard volumes, standard flow rates and operating flow rates can be calculated using this initial data.

In addition to volume conversion and data logging, the EK220 may be used for the flexible data recording of different measurements and, in conjunction with either a modem or RTU, for system monitoring.

• T, PT, PTZ volume conversion
• Conforms to European standard EN 12405
• MID approval
• Compressibility calculated in accordance with different methods
• Flexible, integrated data logging function
• High accuracy
• Mains-free operation
• Suitable for use in Zone 1 hazardous areas
• Three digital inputs
• Four freely programmable, sealable digital outputs
• Various communication protocols
  • IEC 62056-21
  • Modbus
  • IDOM
• Optical interface for parameterisation and readout (IEC 62056-21)
• Integrated serial interface can be used as RS232 or RS422/RS485

Applications

• Volume conversion for billing purposes.
• Data logging for different applications.
• Monitoring of measurement values and station functions: two additional digital inputs can record signals from regulator safety shut-off valves, differential pressure switches in filters or a door contact; the events are archived and can be sent by SMS or e-mail through a connected modem.

Sensors and calculation

• Absolute pressure sensor ENVEC CT30, integrated in the housing or external; ranges 0.7–2, 0.8–5, 1.4–7, 2–10, 2.4–12, 4–20, 6–30, 8–40, 14–70 and 16–80 bar. A version without a pressure sensor works as a temperature conversion device (T) with a fixed pressure configured at commissioning.
• Pt-500 temperature sensor (Pt-1000 optional) to DIN 60751, protective tube 50 mm long, Ø6 mm, 2.5 m cable.
• Compressibility calculated according to S-GERG 88, AGA 8 DC, AGA 8 (GC1 or GC2), AGA NX-19, AGA NX-19 following Herning & Wolowsky, or fixed.

Archives and logbooks

• Archives: 2 monthly, 1 daily, 1 measurement, 1 process data archive and 4 additional flexible archives (content, recording interval and triggering events selectable).
• Event logbook (500 records), change logbook (audit trail, 200 records) and certification data log (50 records).

Inputs/outputs, communication and installation

• 3 digital inputs (LF pulses from the gas meter, message signals such as a manipulation contact); 4 freely programmable, sealable transistor outputs (volume pulses, alarm/warning status).
• Optical interface to IEC 62056-21 for parameterisation and readout; the internal serial interface can be used as RS232 or RS422/RS485; protocols IEC 62056-21, Modbus ASCII/RTU/TCP, IDOM and SMS.
• Cast aluminium housing for wall or meter mounting; 4-button keypad, 2-line display; an additional battery can double the service life, or use an external 5–10 V DC supply.

Information to send with a quote request

So that CAD can quote within 24 working hours, please send:

• Conversion type required: T, PT or PTZ.
• Operating pressure of the line (to choose the pressure sensor range) and an integrated or external pressure sensor.
• The gas meter it works with (low-frequency pulse output) and the installation area (Zone 1, outdoors).
• Communication protocol needed: RS232/RS485, Modbus, IDOM, SMS through a modem; external power supply or additional battery.