Elster EK220, Operating Instructions And Installation Information

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Volume Conversion Device EK220
© Elster GmbH 117
B-5 Signal and pulse outputs
Four transistor outputs with common ground (minus pole).
The volume pulses acquired for one measurement cycle are output as pulse packets. They
are therefore not suitable for open and closed-loop control purposes.
Designation
DA1... DA4
Cable connection Plug-in terminals; d = 0.3 ... 1.4 mm²
With flexible cable use wire-end sleeves.
Screening Connect cable screen to the cable gland over the full area.
Special features Each output can be parameterised and sealed separately.
Nominal data:
F
The limits in the certificate of conformance must be observed when using the EK220 in
Ex Zone 1, also for data which is not mentioned here.
Maximum switching voltage 30 V DC
Maximum switching current 100 mA DC
Maximum voltage drop 1V
Maximum residual current 0.001 mA
Pulse duration Min. 125 ms, adjustable on a pitch of 125 ms
Space duration Min. 125 ms, adjustable on a pitch of 125 ms
Output frequency Max. 4 Hz, adjustable
B-6 Optical serial interface
Optical interface according to IEC 62056-21; bit-serial, asynchronous data transmission
according to ISO 1177, half duplex.
Support of
Data transmission mode "C" (= Data read-out, programming and manufac-
turer-specific applications with automatic change of the baud rate).
Baud rate
300 Bd (initial baud rate); automatic up to 9600 Bd.
Format 1 start, 7 data, 1 parity (even) and 1 stop bit.
Connection Optical read-out head on device front panel
(automatic positioning / fixing by magnet).
B-7 Electrical serial interface (internal)
Interface RS232 or RS485 (selectable), e.g. for the connection of an FE260 Function E x-
pansion Unit, a modem or an MTL5051 Interface Isolator.