Elster EK220, Operating Instructions And Installation Information, Page: 8 / 120

Volume Conversion Device EK220
8 © Elster GmbH
1 Brief description
The EK220 Volume Conversion Device is used for the conversion of the gas volume
measured in the operating state by a gas meter to the standard state and in the appropr i-
ate energy.
The momentary values of pressure and temperature are measured for the determination of
the operating state. The gas law deviation factor (K-value) can be computed alternatively
according to S-GERG-88, AGA 8 GC method 1 or 2, AGA-NX19 or AGA-NX19 according
Herning and Wolowsky or it can be entered as a constant. The volume is converted into
energy using the adjustable calorific value.
The integral recording device includes the consumption profile of a number of months for a
measurement period of 60 minutes.
Power supply:
·
Battery operation with a service life depending on operating mode
³
5 years.
·
Optional double battery life by connection of an additional battery poss ible.
·
Battery replacement possible without loss of data and without violation of calibration
seals.
·
Data retention without battery supply due to internal non -volatile memory.
·
Connection for external power supply unit.
Operator interface:
·
Alphanumeric display with two lines of 16 characters.
·
A display list freely assignable by the user.
·
Programming via keypad possible.
·
Calibration switch (separately sealed in the device).
·
Two user locks (supplier's and customer's locks) with numerical codes.
·
Access rights for each individual value can be set separately via interface (with appr o-
priate rights).
Counter / signal inputs:
·
3 inputs for reed contacts or transistor switches, programmable as pulse or signal i n-
puts.
·
Maximum counting frequency 2 Hz (adjustable).
·
Pulse value for each input separately adjustable, also non-decade.
·
Various counters for Vb and Vm as well as for each input (main and original counter,
disturbance volumes, totaliser, adjustable counter, measurement period counter).
·
Each input can be separately sealed and secured under official calibration.
Pulse / signal outputs:
·
4 programmable transistor outputs, each freely programmable as alarm / warning ou t-
put, pulse output, signal output for limit monitoring.
·
Each output can be separately sealed and secured under official calibration.
Data interface:
·
Optical interface according to IEC 62056-21 (replaces IEC 61107 and EN61107).
·
Permanently wired serial interface, as RS485 or RS232 usable
·
MODBUS protocol via permanently wired serial interface.
·
IDOM protocol via the permanently wired serial interface.