User guide
Ultrasonic heat meter SonoMeter 30
2 | VU.SH.I1.02
© Danfoss | 2019.10
1. General information
This instruction designed for ultrasonic heat
meter SonoMeter 30 flow and energy verification
and calibration.
Heat meter energy measurement error (δ
Es
)
assess the application of the partial verification
method: assesses the calculator thermal energy
measurement error (δ
E
), the flow volume
measurement error (δ
V
) and temperature sensor
temperature difference measurement error (δ
T
).
Heat meter energy measurement error (δ
Es
) are
all components of the arithmetic sum of the
errors:
Es
=
׀
E
׀
+
׀
T
׀
1) Energy pulse out terminals (Fig. 1) connected
to the pulse counter (not required when
reading the measurement results directly
from the display or via a digital interface)
Pin 53
- Energy Pulse output (Pulse)
Pin 52
- Energy Pulse output (GND)
2. Test instruction
2.1 Calculator energy
measurement error (δ
E
) test
2) Temperature sensors placed in the
temperature testing bench (for temperature
difference simulation).
3) Verification mode is activated by connecting
TEST jumper contacts 1 (FIg. 1).
4) Determination errors:
- before each measurement run automatic
verification mode with long button clicking
on the meter (simulated flow pulses),
- When the LCD display stops blinking “TEST”,
energy and volume values can be read
directly from the LCD screen or through the
optical / digital interface. The pulses shall
begin calculated with the corresponding
nominal flow pulse values as follows:
Permanent flow q
p
(m
3
/h)
Energy pulse value,
(Wh/imp)
0.6
0.1
1.0
0.2
1.5
0.2
2.5
0.5
3.5
0.5
6.0
1
10.0
2
15.0
5
- energy E (kWh) measurement error is
calculated by formula:
E
= (E – E
0
) / E
0
• 100 %
there:
E
0
– the conventional true energy E value
(kWh), calculated in consideration of the
fluid temperature values simulated Θ1, Θ2
and simulated change in volume values:
Flow sensor mounting
place
E
0
calculating formula
Supply pipe
E
0
=V1 • ρ1 • (h
T1
-h
T2
)
Return pipe
E
0
=V1 • ρ2 • (h
T1
-h
T2
)
There:
E
0
– the estimated true value of the energy component
(kWh);
V1
– simulated water volume value (m
3
);
ρ1…ρ2
– density of water, corresponding to the sumulated
temperature value Θ1,Θ2, (kg/m
3
);
h
T1
… h
T2
– relative enthalphy of water, corresponding to the
simulated temperature value Θ1,Θ2
1) Volume pulse output terminals (Fig. 1)
connected to the pulse counter (not required
when the measurement results are directly
reading from the display or via a digital
interface)
Pin 51
- Volume Pulse output (Pulse)
Pin 50
- Volume Pulse output (GND)
2.2 Volume measurement
errors (δ
V
) test
2) Switched on verification mode by connecting
TEST jumper contacts 1 (1 pav),
3) The meter mounted on the flow test bench,
flow are simulating.
Recommended minimum pulse content and
measurement time:
Flow
Pulse content
Measurement time
0.1 q
p
<q ≤ q
s
N≥1000
T> 1 (min)
q
i
≤ q ≤ 0.1 q
p
N>500
T > 1 + 8 q
i
/q, (min)
Fig. 1
