Volume Measurement; Lf Pulse Generator (Reed Contact); Connection - Honeywell EK280 Applications Manual

EK280

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
LF pulse generator
HF pulse generator
NAMUR encoder a
NAMUR encoder a-b
SCR EDIS encoder
SCR OBIS encoder

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.
− 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.
Application Manual
Specifications
Reed contact or open collector transistor
NAMUR max. 2500 Hz, for use only with external power supply (not battery)
NAMUR protocol encoder a
NAMUR protocol encoder a and b
SCR EDIS encoder with EDIS95 protocol
SCR encoder with OBIS05 protocol
DE1
+ -
LF Pulse
generator
(reed contact)
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