Diehl Hydrus 171A - Battery Power Supply; Pin Assignment of Cable; Galvanic Isolation; Pulse Outputs (Open Collector)

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4. Battery power supply (one or two batteries)

Standard version with one 3.6 VDC lithium battery with a battery
lifetime of up to 12 years depending on conguration and installation
location.

Meter version with two 3.6 VDC lithium batteries with a battery life
time of up to 16 years depending on conguration and installation
location.
Batteries cannot be retrotted or replaced!
5. Pin assignment of cable
The M-Bus, L-Bus or pulse variant of the meter is supplied with a 1.5-m
long 3-wire cable with wire end ferrules.
Power supply takes place via the internal battery. An external
power supply via a M-Bus Master is not possible.
Version/colour Pulse L-Bus/pulse M-Bus (2 wire)
white Pulse 2 Pulse 2 M-Bus
brown GND (ground) GND (ground) –
green Pulse 1 L-Bus M-Bus
Galvanic isolation
Because of possible damage due to electrical corrosion a poten-
tial tension between the ground connection of the L-Bus / Pulse
output and the meter housing (brass) should be avoided.
6. Pulse outputs (open collector)
The HYDRUS has two pulse interfaces. Depending on device congura-
tion, the set pulse duration, pulse interval and pulse frequency may be
different.
Detailed description of the pulses can also be found in the HYDRUS
product specication. http://www.diehl.com/en/diehl-metering/products-
solutions/product-download/
Please select the partner "Diehl Metering GmbH" and the product area
"Water metering".
HYDRUS
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