Datasheet

Data Sheet SONOMETER
TM
2000 – Ultrasonic heat meter
SONO 1500 CT Power supply
The standard version contains a 3.0 VDC lithium
battery (max. 90 °C) with a lifetime of 12 years
(depends on configuration). It’s also possible to
use an external supply e.g. from a calculator.
Characteristic for ext. power supply:
- Power supply 3.0 ... 5.5 V DC;
- Power consumption < 130 mAh per year;
- Impulse current < 10 mA.
Pulse output
The flow sensor has two pulse output.
- Volume pulse output;
- Output for testing (high resolution pulse
output for test laboratories, temporary limited)
and for communication.
The output for testing is a combined impulse
output. That means the flow sensor can emit a
high resolution test impulse or the flow sensor
can communicate via the same output.
By using an adapter the flow sensor can be read
out via the HYDRO-SET Software.
The electrical information for the volume pulses
of the model for heating is described as follows:
The pulse output is by default not galvanic. A
galvanic pulse output is as an option available.
The flow sensor has, by default, a 4-pin impulse
cable with a length of 2.5 m. The maximal length
is 10 m.
Specification of the pulse output:
Battery supply External supply
Volume impulse
output
No galvanic insulation
(standard)
Galvanic insulation No galvanic insulation
Power Supply 3.0 V DC
battery
3.0 – 5.5 V DC
external supply
Contact load UCE ≤ 30 V
IC ≤ 20 mA with residual
voltage of ≤ 0.5 V
UCE ≤ 30 V
IC ≤ 1 mA with residual
voltage of ≤ 0.5 V
UCE ≤ 30 V
IC ≤ 20 mA with residual
voltage of ≤ 0.5 V
Output frequency ≤ 20 Hz * ≤ 150 Hz
Pulse description Open Collector
Pulse values 1 ml ... 5000 l
(depends on qp)
* 1 ml ... 5000 l
(depends on qp)
Pulse duration 1 ... 250 ms ± 10% pulse
duration ≤ pulse pause
* 1 ... 250 ms ± 10% pulse
duration ≤ pulse pause
Cable allocation
White core + volume impulse
Yellow core test impulse / communication
Blue core GND
Brown core reserved - volume impulse + power supply
* depends on the average flow during the lifetime of the flow sensor, on the pulse duration and on the pulse
value.
SONO 2500 CT The ultrasonic flow sensor measures with
the assistance of directly transferring pulses
between sounders, without necessity of pulse
reflecting from mirror’s surfaces. Thanks to
application of this innovative principle of
operation the measures are characterized by
accuracy and reliability, and in connection with
wide range of dynamic measures those flow
sensors have assurance of more than 20 years
operation stability.
The ultrasonic principle is used in measuring
the flow. Two ultrasonic transducers functioning
as both transmitter and receiver are positioned
opposite each other at the inlet and outlet of the
flow sensor.
Ultrasonic signals are transmitted between
both transducers. One signal travels in the same
direction as the water flow, the other travels
against the flow.
Measurement is performed by determining the
time the ultrasonic signal takes to travel with and
against the flow. The principle can be expressed
as follows:
t
up
– t
down
Δt
v = K = K
t
up
x t
down
t
2
t
down
= Time in the flow direction
t
up
= Time against the flow direction
v = Average flow velocity
t = Transit time
K = Proportional factor
This measuring principle offers the advantage
that it is independent of variations in the actual
sound velocity of the liquid.
Proportional factor K is determined by wet
calibration.
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DH-SMT/PL
VD.SH.A3.02 © Danfoss 08/2009