GHM DeltaOHM HD52.3D Series User manual

Operating manual
Ultrasonic anemometers
HD52.3D… series
www
.deltaohm.com
English
Keep for future reference
.

HD52.3D… - 2 - V3.0
TABLE OF CONTENTS
1 INTRODUCTION .................................................................................................... 3
1.1 M ODELS ........................................................................................................... 4
2 TECHNICAL SPECIFICATIONS ...............................................................................
3 DESCRIPTION ....................................................................................................... 8
4 MEASURING PRINCIPLE OF WIND SPEED AND DIRECTION ................................ 10
INSTALLATION ................................................................................................... 11
5.1 A LIGNMENT OF THE INSTRUMENT ............................................................................ 12
5.2 A SSEMBLING RAIN GAUGE FILTER AND FUNNEL IN HD52.3DT147 ..................................... 13
5.3 E LECTRICAL C ONNECTIONS ................................................................................... 14
5.3.1 RS232 SERIAL CONNECTION .................................................................... 15
5.3.2 RS485 SERIAL CONNECTION .................................................................... 15
5.3.3 RS422 SERIAL CONNECTION ..................................................................... 16
5.3.4 SDI-12 SERIAL CONNECTION ................................................................... 17
5.3.5 A NALOG OUT UTS C ONNECTION .................................................................. 17
5.3.6 USB CONNECTION VIA THE RS52 CABLE (RS232/USB) .................................... 18
5.3.7 USB CONNECTION VIA THE RS51K CABLE (RS485/USB) .................................. 18
5.3.8 C ONNECTION OF HEATING SYSTEM ............................................................... 19
6 CONFIGURATION ................................................................................................ 20
6.1 S ERIAL C OMMANDS ............................................................................................ 21
7 RS232 AND RS48 ASCII PROPRIETARY MODES ................................................ 30
8 NMEA MODE ........................................................................................................ 31
9 MODBUS-RTU MODE ........................................................................................... 33
10 SDI-12 MODE ...................................................................................................... 37
11 INSTRUMENT STORAGE ...................................................................................... 40
12 SAFETY INSTRUCTIONS ...................................................................................... 40
13 ACCESSORIES ORDERING CODES ....................................................................... 41

HD52.3D… - 3 - V3.0
1INTRODUCTION
The instruments of the series HD52.3D… are 2-axis ultrasonic static anemometers. The availa-
ble measurement options combine in a single instrument the main quantities of meteorological
interest, making the instrument like a compact and light meteorological station.
Measured quantities:
•Wind speed and direction, U-V Cartesian components of wind speed
•Wind Gust
•Relative Humidity and temperature (optional)
•Global solar radiation (optional)
•Barometric pressure (optional)
•Rainfall (optional)
The “Rainfall” and “Global solar radiation” options are alternatives (they cannot be both pre-
sent in the same instrument).
The average of wind speed and direction over a period configurable up to 10 minutes is calcu-
lated.
All models are equipped with a magnetic compass.
Wind speed and direction are determined by measuring the transit time of ultrasonic pulses
between two pairs of ultrasonic transducers.
RS232, RS485, RS422 and SDI-12 serial interfaces are available with ASCII proprietary or
NMEA, MODBUS-RTU and SDI-12 standard communication protocols.
All versions have two analog outputs, for wind speed and direction, which are factory-
configurable within 4÷20 mA (standard), 0÷1 V, 0÷5 V or 0÷10 V (to be specified when or-
dering).
The heater option prevents the accumulation of snow and ice formation, allowing precise
measurements in all environmental conditions.
Mounting on ∅ 40 mm mast. The electric connection is performed through a M23 19-pole con-
nector situated on the bottom of the instrument.
The low power consumption of the instrument allows installation in remote sites, with power
supplied by photovoltaic panel and backup battery.
The absence of moving parts minimizes the instrument maintenance.

HD52.3D… - 4 - V3.0
1.1 M ODELS
The table below shows the optional features in the various models of the series.
OPTIONS
Model Atm.
press.
R.H.
Temp.
Global
solar
rad.
Rainfall
Bird
spikes
Heating
Powder
coating
Analog
outputs
HD 2.3D[K][R][W][V…]
Option
K
Option
R
Option
W
4…20 mA if
not specified
Options
V: 0…10 V
V1: 0…1 V
V : 0…5 V
HD 2.3D[K]4[R][W][V…]
√
HD 2.3DP[R][W][V…]
√
N.A.
HD 2.3DP4[R][W][V…]
√ √
HD 2.3D[K]17[R][W][V…]
√
Option
K
HD 2.3D[K]147[R][W][V…]
√ √
HD 2.3DP17[R][W][V…]
√
√
N.A.
HD 2.3DP147[R][W][V…]
√ √ √
HD 2.3D[K]T147[W][V…]
√ √
√
Option
K N.A.
Note:
•Bird spikes option is not available in the models measuring global solar radiation.
•The heating option is not available in the model with rain gauge.

HD52.3D… - 5 - V3.0
2TECHNICAL SPECIFICATIONS
Wind speed
Sensor Ultrasounds
Measuring range 0…60 m/s (0…50 m/s with rain gauge option)
Resolution 0.01 m/s
Accuracy ± 0.2 m/s or ± 2%, the greatest (0…35 m/s), ± 3% (> 35 m/s)
Wind direction
Sensor Ultrasounds
Measuring range 0…359.9°
Resolution 0.1°
Accuracy ± 2° RMSE from 1.0 m/s
Compass
Sensor Magnetic
Measuring range 0…360°
Resolution 0.1°
Accuracy ± 1°
Air temperature (needs option 17)
Sensor t100
Measuring range -40…+70 °C
Resolution 0.1 °C
Accuracy ± 0.15 °C ± 0.1% of measurement
Relative humidity (needs option 17)
Sensor Capacitive
Measuring range 0…100%RH
Resolution 0.1%
Accuracy (@ T = 15…35 °C) ± 1.5%RH (0…90%RH), ± 2%RH (remaining range)
Accuracy (@ T = -40…+70 °C) ± (1.5 + 1.5% of measurement )%RH
Barometric Pressure (needs option 4)
Sensor iezoresistive
Measuring range 300…1100 h a
Resolution 0.1 h a
Accuracy ± 0.5 h a (700...1100 h a) @ 20 °C
±1 h a (500…1100 h a) / ±1.5 h a (300…500 h a) @
T=(0…60 °C)
Solar radiation (needs option P)
Sensor Thermopile
Measuring range 0…2000 W/m
2
Resolution 1 W/m
2
Accuracy 2
nd
Class yranometer
Rainfall (needs option T)
Sensor Tipping bucket
Resolution 0.2 mm
Accuracy 99% up to 120 mm/h
Maximum rainfall rate 2000 mm/h
Collector area 127 cm
2

HD52.3D… - 6 - V3.0
General features
ower Supply 10…30 Vdc
ower consumption 26 mA @ 24 Vdc without heater
8 W @ 24 Vdc with heater
Serial outputs RS232, RS485 (¼ Unit Load), RS422 and SDI-12
Communication protocols NMEA, MODBUS-RTU, SDI-12, proprietary RS232 and RS485
Analog outputs 2 analog outputs, for wind speed and direction. Output at
choice among 4…20 mA (standard), 0…1 V, 0…5 V and
0…10 V (option 0…10 V needs 1 …30 Vdc power supply)
Wind speed averaging interval Configurable from 1 s to 10 min
Electrical connection 19-pole M23 male connector
Operating temperature -40…+70 °C
Minimum temperature for the rainfall sensor 1 °C
rotection degree I 66
Survival speed 90 m/s (60 m/s with rain gauge option)
Weight About 1 kg (version HD52.3D 147)
About 1.5 kg (version HD52.3DT147)
Case lastic material. Metal parts: AISI 316
Dimensions (mm)
150
336
40 ext.
36 int.
50
150
357
40 ext.
36 int.
50
HD 2.3D17 / HD 2.3D147 HD 2.3DP17 / HD 2.3DP147
Mast
Mast

HD52.3D… - 7 - V3.0
HD 2.3D / HD 2.3D4 HD 2.3DP / HD 2.3DP4
132
547
40 ext.
36 int.
50
150
HD 2.3DT147
Mast
Mast
Mast

HD52.3D… - 8 - V3.0
3DESCRIPTION
1. yranometer
2. Ultrasonic sensors for the measurement of wind speed and direction
3. rotective shield from solar radiation for relative humidity and temperature sensors
4. Fixing clamp to Ø 40 mm mast
Note: in the models measuring barometric pressure, the pressure sensor is inside the instru-
ment.

HD52.3D… - 9 - V3.0
Version with rain gauge
1. Rain gauge
2. Ultrasonic sensors for the measurement of wind speed and direction
3. rotective shield from solar radiation for relative humidity and temperature sensors
4. Fixing clamp to Ø 40 mm mast

HD52.3D… - 10 - V3.0
4MEASURING PRINCIPLE OF WIND SPEED AND DIRECTION
Wind speed and direction are determined by measuring the time taken by ultrasonic pulses to
cover the distance from the transducer that generates the pulse to the receiving transducer.
The instrument uses 2 pairs of transducers oriented along two orthogonal axes. Detecting the
wind speed along two axes allows determining not only the intensity but also the wind direc-
tion.
The instrument measures the travel time of the ultrasonic pulse between the two transducers
of the same pair in both directions. The travel times in the two opposed directions are defined
as t
A
(forward direction time) and t
R
(reverse direction time).
If wind speed is zero, t
A
and t
R
values are the same. In the presence of wind, one of the two
time values is greater than the other and the comparison between the two time values allows
to determine the direction and the intensity of the wind.
Measuring the travel time in both directions allows to cancel the dependence of the transmis-
sion speed of ultrasounds in the air from the environmental conditions of temperature, humidi-
ty and barometric pressure.
Measurement along first axis Measurement along second axis
The travel times of the ultrasonic pulses are given by:
W
A
V
C
D
t
+
=
W
R
V
C
D
t
−
=
Where:
D = Distance between the two transducers of the same pair
C = Sound speed
V
W
= Component of wind speed along the measurement axis
Measuring the two travel times allows determining the wind speed component:





−⋅=
RA
W
tt
D
V11
2
Axis U
Transducer Transducer
Transducer Transducer
Axis V