DeltaOHM HD53LS.A 2-Axis Ultrasonic Static Anemometers Instruction Manual

HD53LS.A 2-Axis Ultrasonic Static anemometer
Instruction Manualwww.deltaohm.com
Keep it for future reference.

INTRODUCTION

HD53LS.A and HD53LS.S are 2-axis ultrasonic static anemometers for the measurement of:

• Wind speed and direction
• U-V Cartesian components of wind speed
• Wind Gust (only HD53LS.S)

The average of wind speed and direction over a period configurable up to 10 minutes is calculated. Wind speed and direction are determined by measuring the transit time of ultrasonic pulses between two pairs of ultrasonic transducers.
HD53LS.A has 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 ordering). HD53LS.S has RS485 MODBUS-RTU output. All models are equipped with a magnetic compass. Mounting on ∅ 40 mm mast. The electric connection is performed through an M23 19-pole connector situated on the bottom of the instrument. The low power consumption of the instrument allows installation in remote sites, with power supplied by the photovoltaic panel and backup battery. The absence of moving parts minimizes instrument maintenance.

TECHNICAL SPECIFICATIONS

Wind speed

Used sensor| Ultrasounds
Measuring range| 0…50 m/s
Resolution| 0.01 m/s
Accuracy| ± 0.2 m/s or ± 2%, the greatest (0…35 m/s), ± 3% (>35 m/s)
Wind direction
Used 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°
General Features
Power Supply| 10…30 Vdc (15…30 Vdc for the version with 0+10 V analog output)
Power consumption| 26 mA @ 12 Vdc
Analog output| 2 analog outputs: one for wind speed and one for wind direction (only in HD53LS.A).
The analog output type is 4…20 mA as standard; 0…1 V, 0…5 V or 0…10 V available on request.
Analog output refresh rate 1 Hz.
Digital output| RS485 MODBUS-RTU (only in HD53LS.S)
Averaging interval| Configurable from 1 s to 10 min
Electrical connection| M23 connector
Operating temperature| -20…+55 °C
Survival speed| 90 m/s
Protection degree| IP 66
Dimensions| H=179mm, 0=150mm
Weight| 640 g approx.
Case| ASA. Metal parts: AISI 316

MEASURING 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 for determining not only the intensity but also the wind direction.
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 tA (forward direction time) and tR (reverse direction time).
If wind speed is zero, tA and tR 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 one to determine the direction and the intensity of the wind.
Measuring the travel time in both directions allows for canceling the dependence of the transmission speed of ultrasounds in the air from the environmental conditions of temperature, humidity, and barometric pressure.

The travel times of the ultrasonic pulses are given by:

Where:
D = Distance between the two transducers of the same pair
C = Sound speed
VW = Component of wind speed along the measurement axis
Measuring the two travel times allows for determining the wind speed component:

INSTALLATION

To install the instrument, pass the connection cable inside the support mast and connect the 19-pole M23 female connector of the cable to the 19-pole M23 male connector situated at the bottom of the instrument. Ensure connection stability by tightening the connector external nut.
Align the arrow on the housing of the instrument to the North (see par. 4.1 “Alignment”), then fix it on the support mast by tightening the cable tie at the bottom of the instrument.

The support mast, having a 40 mm maximum outer diameter and 36 mm minimum inner diameter, should be positioned on a stable surface.
The instrument should be installed vertically and in an open area, far from obstructions located in the vicinity that might alter the natural air flow. Any close objects (such as  buildings, trees, pylons, etc.) should be at a distance equal to at least ten times their height.

In the presence of close objects, it is advisable to place the instrument at a height of 10 m.
For open-space installations, the instrument can be installed using the tripod HD2005.20 (2 m) or HD2005.20.1 (3 m).
If the instrument is installed on a building, the height of the instrument should be at least 1.5 times the minimum value between the height of the building and the roof’s longest diagonal.

Mount the instrument far from magnetic materials and devices that generate magnetic fields (electric motors, electric power cables, electric transformers, radars, radio transmitters, etc.) in order to prevent faulty indications from the magnetic compass.
In the case of mobile installations (for example on a boat), take into account that the instrument measures the relative (apparent) wind speed with respect to the instrument. To determine the absolute (real) wind speed one should consider the movement velocity of the instrument.
The instrument is factory-calibrated and does not require additional interventions from the user.
For the available configuration parameters, the related factory settings, and the commands to modify the parameters, see Chapter 6 “CONFIGURATION”.
In the model HD53LS.S, the RS485 MODBUS-RTU mode will be active for 10 seconds after power up.

4.1 ALIGNMENT OF THE INSTRUMENT
The instrument is equipped with a magnetic compass, and wind speed and direction measurements are automatically compensated and referred to magnetic North, even if alignment to North is not performed. This allows obtaining accurate measurements even in the case of mobile installations.
It is possible to disable the compass compensation of the wind speed and direction measurements.
In this case, it is necessary to align the instrument during installation. The arrows on the case will facilitate the alignment.

For an accurate alignment, connect the instrument to a PC (see following chapters for communication protocols), then rotate the instrument on its vertical axis until the compass measures 0.0° ± 0.1°.
When evaluating the wind direction, one should take into account that the geographic North differs from the magnetic North indicated by a magnetic compass. The difference,  named magnetic declination, depends on the area where the instrument was installed (for example, about 15° in North America and less than 3° in Europe).
If wind speed and direction values are given in polar coordinates, a 0° angle corresponds to a wind coming from the North.

4.2 ELECTRICAL CONNECTIONS
All connections are performed through a 19-pole M23 male connector situated at the bottom of the instrument. The figure and the table below show the numbers and function of  the connector contacts and the corresponding wires of the optional CP52.x cable:

Connector pin N| CPS2.x cable wire N°/color| Symbol| Description
---|---|---|---
1| | | Not connected
2| 2 / Blue| | Not connected
3| 3 / Yellow| RX +| RX for RS232 connection
4| | | Not connected
5| | | Not connected
6| 6 / Pink| | Not connected
7| 7 / Violet| | Not connected
8| 8 / Grey| GND| Serial ground
9| 9 / White| TX –| DATA – for RS485 connection (only HD53LS.S) TX for RS232 connection
10| | | Not connected
11| | | Not connected
12| 12 / Black| GND| Instrument power supply negative
13| 4 / Grey-Pink| | Not connected
14| 10 / Brown| OUT 1| Analog output 1 positive (only HD53LS.A)
15| | GND| Analog ground (only HD53LS.A)
16| 11 / Green| OUT 2| Analog output 2 positive (only HD53LS.A)
17| 5 / Red-Blue| TX +| DATA + for RS485 connection (only HD53LS.S)
18| | V +| Instrument power supply positive (10…30 Vdc)
19| 1 / Red| V +| Instrument power supply positive (10…30 Vdc)
—| Black (thick wire)| SHIELD| Cable shield

RS232 SERIAL CONNECTION

For RS232 connection, TX-, RX+, and serial GND signals (pin 9, 3, and 8 of M23 connector) are used, to be connected respectively to RX, TX, and GND signals of RS232 port on PC (pin 2, 3, and 5 of 9-pole SubD connector). The length of RS232 cables should not exceed 15 m.
The RS232 serial connection is used for the instrument configuration (via serial commands or HD52.3D-S software) and for displaying the measurements in real-time (via  HD52.3D-S software).
If the PC is not equipped with RS232 serial ports, the RS52 adapting cable (with built-in USB/RS232 converter) can be inserted between the PC and the instrument (see  paragraph 4.2.4).

RS485 SERIAL CONNECTION (ONLY HD53LS.S)

Thanks to the RS485 connection, multiple instruments can be connected to a multi-point network.
Instruments are connected in sequence through a twisted-pair shielded cable for signals and the third wire for ground.
Line terminations should be placed at the two ends of the network. The cable shield should be connected to both ends of the line.
The maximum number of devices that can be connected to the RS485 line (Bus) depends on the load characteristics of the devices to be connected. The RS485 standard requires that the total load does not exceed 32 unit loads. The load of an HD52.3D… anemometer is equal to ¼ of the unit load. If the total load is greater than 32 unit loads,  divide the network into segments and add a signal repeater between a segment and the successive one. Line termination should be applied at both ends of each segment.
The maximum length of the cable depends on the transmission speed and the cable characteristics.
Typically, the maximum length is 1200 m. The data line should be kept separate from any power lines in order to prevent interference with the transmitted signal.
Each instrument on the network is univocally identified by an address. Multiple transmitters with the same address should not be placed on the network.
If the instrument is connected to a data logger, the possibility to connect multiple sensors to the network depends on the data logger’s capacity to manage multiple sensors.
MODBUS-RTU protocol is used with an RS485 connection.
Before connecting the instrument to the network, configure the address and Baud Rate (see chapter 6 “CONFIGURATION”).

ANALOG OUTPUTS CONNECTION (ONLY HD53LS.A)
Connect the outputs according to one of the two schemes below, depending on the output type, current (standard), or voltage (on request), available in the instrument. OUT 1  and OUT 2 are associated with wind speed and direction respectively. To change the type of speed and direction measurements associated with the outputs, see chapter 6  “CONFIGURATION”.

Current outputs are active. Load resistance: RL < 300 Ω.

4.2.4 CONNECTION OF RS52 CABLE
If the PC is not equipped with RS232 serial ports, but with USB ports only, the RS52 adapting cable (with built-in USB/RS232 converter) should be interposed between the PC and the instrument.

To use the RS52 cable, the drivers included in the HD52.3D-S software package should be installed in the PC (see the guide to USB drivers installation included in the software package). The instrument is powered directly from the USB port of the PC.

CONFIGURATION

Configuration mode allows reading the instrument’s general info (firmware version, calibration date, serial number), to read and set the instrument operation parameters.
To configure the instrument, an RS232 serial connection to a PC should be performed (see paragraph 4.2.1). If your PC is not equipped with RS232 serial ports, the RS52 adapting cable can be placed between the PC and the instrument (see paragraph 4.2.4).
The instrument configuration can be realized with the aid of the HD52.3D-S application software (see the instructions of the software) or by sending serial commands via standard communication programs. If a standard communication program is used, the program communication parameters should be set as follows:

• Baud rate: 115200
• Data Bits: 8
• Parity: None
• Stop Bit: 2

HD53LS.S: The serial output of the HD53LS.S model is preset to operate in MODBUS-RTU mode; in order to enter configuration mode after connecting the instrument to the PC via RS232 it is necessary to send within 10 seconds from power on (if the instrument is already powered, power cycle the instrument) the serial command @(if a standard communication program is used) or the request of connection with the HD52.3D-S application software if the application software is used.
To reset the serial output of the HD53LS.S model to MODBUS-RTU mode after the configuration has been carried out, power cycle the instrument: the MODBUS-RTU protocol will become active after 10 seconds from the restart.
HD53LS.A:
The serial output of the HD53LS.A model is always in configuration mode.
5.1 SERIAL COMMANDS
The tables below describe the serial commands that allow reading the current instrument configuration and change the operation parameters.

Instrument information

General parameters:

• m/s if n=1
• cm/s if n=2
• km/h if n=3
• knot if n=4
• mph if n=5
Default : m/s (n=1)
RGUV| nI| Reads the wind speed measuring unit set in the instrument
CWCnnnn| &I| Sets wind speed threshold to nnnn value (in hundredths of m/s)
Value should range within 0 and 100 hundredths of m/s (= 0…1 m/s)
Default: 20 (= 0.2 m/s) (see Note 1)
RWC| & Anne I| Reads the wind speed threshold value set in the instrument (in hundredths of m/s)
CWaLnnn| &I| Sets time interval for the calculation of average speed and average direction to nnn value The value should range between 1 and 600 s.
If the value is greater than 10 s, it must be an integer multiple of 10.
Default: 1 s
RWaL| & nnnl| Reads the time interval for the calculation of average speed and average direction set in the instrument
CWaMn| &I| Sets the method for the calculation of average speed and average direction:
• If n=0: scalar mean. The average intensity is calculated as average of intensities without consideration of direction. The average direction is calculated as average of directions, and expressed according to the extended characteristic (see Note 2).
• If n=1: vector mean. The average of the coordinates along each measurement axis is calculated. The average intensity and the average direction are those determined by the two average coordinates.
Default : vector mean (n=1)
RWaM| & n1| Reads the method for the calculation of the average speed and average direction set in the instrument
CCn| &I| Enables/disables the compass compensation of wind speed and direction:
– Disables if n=N – Enables if n=Y
Default: Enabled (n=Y)

NOTE 1: WIND SPEED THRESHOLD VALUE
If the wind speed is very low, the determination of the direction can result inaccurate. The instrument allows setting the threshold value of speed below which the direction value is frozen on the last acquired value.

NOTE 2: WIND DIRECTION EXTENDED CHARACTERISTIC
With a 0÷359° wind direction measuring range, the analog output continues to oscillate between maximum and minimum scale if the direction continues to slightly fluctuate around 0°:

This effect can be reduced through the extended (“wrap-around”) characteristic of wind direction. In this mode, the wind direction is considered as corresponding to 0÷539° range instead of 0÷359°. The wide output fluctuation occurs the first time that the wind direction goes from 0 to 359°; if later the “physical” direction goes back to 0°, the analog output will always remain around 360°. Using the extended characteristic, the behavior of the above graph changes into the following:

If 539° value is exceeded in extended mode, the output goes to the value corresponding to 180°.
The table below shows the correspondence between the value of the analog output and the direction of the wind in the two modes.

Wind
direction| 4…20mA output| 0…1V output| 0…5V output| 0…10V output
---|---|---|---|---
standard| extended| standard| extended| standard| extended| standard| extended
0°| 4.00| 4.00| 0.00| 0.00| 0.00| 0.00| 0.00| 0.00
180°| 12.00| 9.| 0.50| 0.33| 2.50| 2.| 5.00| 3.
360°| 20.00| 15.| 1.00| 0.67| 5.00| 3.| 10.00| 7.
540°| —| 20.00| —| 1.00| —| 5.00| —| 10.00

Analog outputs (only HD53LS.S):

The address should range between 1 and 247 Default: 1
RU5A| & nnnl| Reads the MODBUS address setting
USB| &I| Sets the Baud Rate for MODBUS mode to:
• 9600 if n=3
• 19200 if n=4
• 38400 if n=5
• 57600 if n=6
• 115200 if n=7
Default : 19200 (n=4)
RU56| & n1| Reads Baud Rate setting for MODBUS mode
CU5Mn| &I| Sets parity and stop bits for MODBUS mode to:
• 8N1 if n=0 [No parity, 1 stop bit] • 8N2 if n=1 [No parity, 2 stop bits] • 8E1 if n=2 [Even parity, 1 stop bit] • 8E2 if n=3 [Even parity, 2 stop bits] • 801 if n=4 [Odd parity, 1 stop bit] • 802 if n=5 [Odd parity, 2 stop bits] The number of bits is fixed to 8 Default: 8E1 (n=2)
RUSTIC| & n I| Reads the setting of parity and stop bits for MODBUS mode
CUSWn| &I| Sets waiting time after transmission in MODBUS mode to:
• Immediate reception if n=0 (violates protocol)
• Waiting 3.5 characters if n=1 (respects protocol)
Default : Waiting 3.5 characters (n=1)
RUSW| & n I| Reads the setting of waiting time after transmission in MODBUS mode

NOTE 3; U, V COMPONENTS
By selecting the U and V components, the speed value associated with the initial scale of the two analog outputs is equal to the opposite of the speed value associated with the full scale of the outputs.
For example, if the speed full-scale value is set to SO m/s, the speed range associated with the analog outputs is -50…+50 m/s.

Nore 4; TUNNEL MODE
In tunnel mode, the wind direction measurement is not compensated by the magnetic compass, but the measurement is referred to the direction indicated by the arrow on the instrument case.
Output 2 is set to full-scale value if the wind blows in the direction of the arrow, and to initial scale value if the wind blows in the opposite direction.
The initial scale of output 1 is associated with the speed value opposite to that associated with the output full scale.

Parameters for MODBUS-RTU mode (only HD53LS.S):

The address should range within 1 and 247 Default : 1
RUSA| & nnnI| Reads the MODBUS address setting
CUSBn| &I| Sets the Baud Rate for MODBUS mode to:
• 9600 if n=3
• 19200 if n=4
• 38400 if n=5
• 57600 if n=6
• 115200 if n=7
Default : 19200 (n=4)
RUSB| & ni| Reads Baud Rate setting for MODBUS mode
CU5Mn| &I| Sets parity and stop bits for MODBUS mode to:
• 8N1 if n=0 [No parity, 1 stop bit] • 8N2 if n=1 [No parity, 2 stop bits] • 8E1 if n=2 [Even parity, 1 stop bit] • 8E2 if n=3 [Even parity, 2 stop bits] • 801 if n=4 [Odd parity, 1 stop bit] • 802 if n=5 [Odd parity, 2 stop bits] The number of bits is fixed to 8 Default: 8E1 (n=2)
RU5M| & n I| Reads the setting of parity and stop bits for MODBUS mode
CU5Wn| &I| Sets waiting time after transmission in MODBUS mode to:
• Immediate reception if n=0 (violates protocol)
• Waiting 3.5 characters if n=1 (respects protocol)
Default : Waiting 3.5 characters (n=1)
RU5W| & n I| Reads the setting of waiting time after transmission in MODBUS mode

MODBUS-RTU MODE (ONLY HD53LS.S)

In MODBUS-RTU mode, the instrument sends the acquired measurements only if specifically requested by the PC, PLC or data logger.
Communication parameters should be set in the PC or data logger as follows:

• Baud rate: same as the setting in the instrument (default =19200)
• Data bits: 8
• Parity: same as the setting in the instrument (default = even)
• Stop bits: same as the setting in the instrument (default = 1)

Below is the list of registers.
Input Registers

unsigned 16 bits
15| Wind speed (x100) along V-axis| unsigned 16 bits
16| Wind speed (x100) along U-axis| unsigned 16 bits
17| Status register: bit0=1 Speed measurement error| unsigned 16 bits
18| Wind speed unit of measurement
0 m/s, 1 cm/s, 2 km/h, 3 knot, 4 mph| unsigned 16 bits
21| Wind Gust intensity (x100)| unsigned 16 bits
22| Wind Gust direction in degrees (x10)| unsigned 16 bits

Note: the wind speed measurement value is expressed in the unit set in the instrument.
The Wind Gust measurement is determined by continuously calculating the wind speed averages in a time interval equal to 3 seconds, and detecting the maximum value of the calculated averages over the time elapsed between the current reading command and the previous reading command (the Wind Gust measurement is reset after each reading command).

INSTRUMENT STORAGE

Instrument storage conditions:

• Temperature: -40…+65 °C.
• Humidity: less than 90 %RH no condensation.
• In storing, avoid locations where:
  • There is a high humidity level.
  • The instrument is exposed to direct sunlight.
  • The instrument is exposed to a high-temperature source.
  • There are high vibration levels.
  • There is the presence of vapor, salt, and/or corrosive gas.

SAFETY INSTRUCTIONS

General safety instructions
The instrument has been manufactured and tested in accordance with the safety standard EN61010-1:2010 “Safety requirements for electrical equipment for measurement, control and laboratory use” and has left the factory in perfect safety technical conditions.
The instrument’s proper operation and operating safety can be ensured only if all standard safety measures as well as the specific measures described in this manual are followed.
The instrument’s proper operation and operating safety can be ensured only in the climatic conditions specified in this manual.

Do not use the instrument in places where there are:

• Rapid ambient temperature variations may cause condensation.
• Corrosive or flammable gases.
• Direct vibrations or shocks to the instrument.
• High-intensity electromagnetic fields, static electricity.

If the instrument is moved from a cold place to a hot one or vice versa, condensation formation can cause an instrument malfunction. In this case, you will have to wait for the instrument temperature to reach ambient temperature before turning the instrument on.

User obligations
The instrument operator shall follow the directives and regulations below that refer to the treatment of dangerous materials:

• EEC directives on workplace safety
• National low regulations on workplace safety
• Accident prevention regulations

ACCESSORIES ORDERING CODES

CP52…| Connecting cable with 19-pole M23 female free connector on one end, open wires on the other. Available lengths: 5 m (CP52.5),  10 m (CP52.10), 15 m (CP52.15), 20 m (CP52.20), 30 m (CP52.30), 50 m (CP52.50) and 75 m (CP52.75).
---|---
RS52| Serial connection cable with built-in USB/RS232 converter. USB connector for the PC and screw terminals on the instrument side.
HD2005.20| Tripod with adjustable legs for installing environmental sensors. Material: anodized aluminum. Max. height 225 cm. It can be fixed on a flat base with screws or to the ground with pegs. Foldable legs for transport.
HD2005.20.1| Tripod with adjustable legs for installing environmental sensors. Material: anodized aluminum. Max. height 335 cm. It can be fixed on a flat base with screws or to the ground with pegs. Foldable legs for transport.
CP52.C| Additional 19-pole M23 female free connector.

DELTA OHM metrology laboratories LAT N° 124 are ISO/IEC 17025 accredited by ACCREDIA for Temperature, Humidity, Pressure, Photometry / Radiometry, Acoustics, and Air Velocity. They can supply calibration certificates for the accredited quantities.

EU DECLARATION OF CONFORMITY
Delta Ohm S.r.L. a socio unico — Via Marconi 5- 35030 Caselle di Selvazzano- Padova – ITALY
Document-No,/Month. Year: 5135/ 07.2019
We declare as manufacturer herewith under our sole responsibility that the following products are in compliance with the protection requirements defined in the European Council directives:
Product identifier: HD53LS.A / HD53LS.S
Product description: Ultrasonic anemometers
The products conform to the following European Directives:

Directive

2014/30/EU| | Direttiva EMC / EMC Directive
2014/35/EU| | Direttiva bassa tensione / Low Voltage Directive
2011/65/EU| – 2015/863/EU| RoHS / RoHS

Applied harmonized standards or mentioned technical specifications:

Harmonized standards

EN 61010-1:2010| Requisiti di sicurezza elettrica / Electrical safety requirements
EN 61326-1:2013| Requisiti EMC / EMC requirements
EN 50581:2012| RoHS / RoHS

The manufacturer is responsible for the declaration released by:

Johannes Overhues
Amministratore delegato
Chief Executive Officer
Caselle di Selvazzan0, 19/07/2019

This declaration certifies the agreement with the harmonization legislation mentioned, contained however no war­ ranty of characteristics.

WARRANTY

Delta OHM is required to respond to the “factory warranty” only in those cases provided by Legislative Decree 6 September 2005 – n. 206. Each instrument is sold after rigorous inspections; if any manufacturing defect is found, it is necessary to contact the distributor where the instrument was purchased from. During the warranty period (24  months from the date of invoice) any manufacturing defects found will be repaired free of charge. Misuse, wear, neglect, lack or inefficient maintenance as well as theft and damage during transport are excluded. Warranty does not apply if changes, tampering, or unauthorized repairs are made to the product. Solutions, probes, electrodes, and microphones are not guaranteed as improper use, even for a few minutes, may cause irreparable damages.
Delta OHM repairs the products that show defects of construction in accordance with the terms and conditions of the warranty included in the manual of the product. For any dispute, the competent court is the Court of Padua. The Italian law and the “Convention on Contracts for the International Sales of Goods” apply.

TECHNICAL INFORMATION
The quality level of our instruments is the result of continuous product development. This may lead to differences between the information reported in the manual and the instrument you have purchased. In case of discrepancies and/or inconsistencies, please write to sales@deltaohm.com.
Delta OHM reserves the right to change technical specifications and dimensions to fit the product requirements without prior notice.

DISPOSAL INFORMATION
Electrical and electronic equipment marked with specific symbols in compliance with the 2012/19/EU Directive must be disposed of separately from household waste.
European users can hand them over to the dealer or to the manufacturer when purchasing new electrical and electronic equipment, or to a WEEE collection point designated by local authorities. Illegal disposal is punished by law.

Disposing of electrical and electronic equipment separately from normal waste helps to preserve natural resources and allows materials to be recycled in an environmentally friendly way without risks to human health.

Members of GHM GROUP:

References

• Senseca - Measuring, monitoring, testing and control instruments

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