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EK280
Application Manual
22
4 Volume measurement
Input 1 (terminal "DE1") is used as counter input for the volume conversion device, for applications with
automatic conversion input 2 (terminal "DE2") is also used.
Counter inputs for detection of gas volumes for conversion are generally under calibration lock, i.e. the
connector terminals are sealed and parameters affecting the counter can only be updated with the calibration
lock open.
The following pulse generators or encoders may be connected to input 1:
Volume encoder
Specifications
LF pulse generator
Reed contact or open collector transistor
HF pulse generator
NAMUR max. 2500 Hz, for use only with external power supply (not battery)
NAMUR encoder a
NAMUR protocol encoder a
NAMUR encoder a-b
NAMUR protocol encoder a and b
SCR EDIS encoder
SCR EDIS encoder with EDIS95 protocol
SCR OBIS encoder
SCR encoder with OBIS05 protocol
4.1 LF Pulse generator (reed contact)
4.1.1 Connection
Danger!
For EK280 with internal power supply, the mains voltage must be switched off before
opening the housing, ensure it is not turned back on and verify that there is no voltage.
DE1
+ -
LF Pulse
generator
(reed contact)
−
Connect the gas meter's low frequency pulse generator (reed contact) to terminal "DE1" of the
EK280.
−
Release the input 1 (terminal "DE1") calibration seals.