MULTICAL® 21 & flowIQ® 2101 /..02 /..03 TECHNICAL DESCRIPTION
Kamstrup A/S •Technical Description • 5512-897_J1_GB • 06.2016 63
14 Pulse Interface for MULTICAL® 21 / flowIQ® 2101 / ..02 / ..03
Pulse Interface, type 66-99-143, used during calibration and verification in test stands with pulse interface.
The optical reading head is retained on the meter, by means of a transparent plastic holder (Optical
support, type 6561-331). Data from the water meter is read by the optical reading head, and in the pulse
interface unit converted into high-resolution volume pulses, which can be registered by a pulse receiver.
When the optical reading head is removed it takes 9 hours before the meter returns to normal mode.
Pulse Interface, type 66-99-143, with Optical Support type 6561-331 on the water meter.
Supply: 3.5-30 VDC 15 mA
Standby: 0.2 mA
Pulse width: = 3.9ms
Frequency: Max frequency of 128 Hz
14.1 Connection Pulse Interface
The pulse interface has two outputs – ‘Volume’ and ‘Energy’. The water meter only uses the volume
output.
Each pulse output consists of tree terminals: ‘GND’, ‘Volume Pulse’ and ‘Pull-up Volume’. When the pulse
output is active, Pulse is drawn to GND, i.e. the output is ’active low‘. A 10kΩ resistance is placed from Pull-
Up to Pulse.
The supply for terminals 1 and 2 and the supply connected to the Pull-Up do not need to be the same or at
the same level. The connection of the 8-pole plug J1, is indicated in figures below/next page.
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