High Precision Barometric Transmitter for Outdoor Wall Mount
HD9408.3B is a barometric transmitter that uses a piezoresistive high accuracy and temperature-compensated sensor. It allows to measure the atmospheric pressure in the range from 500…1200 hPa, providing extreme accuracy and time stability, with excellent repeatability, low hysteresis, and excellent temperature behavior.
Pressure measuring ranges:
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0…1350 hPa (HD9408.3B.1 and HD9408.3B.2 digital outputs)
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100…1350 hPa (HD9408.3B.3 SDI-12 output)
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500…1200 hPa (HD9408.3B.1 and HD9408.3B.2 analog outputs)
The transmitter is available in three versions which differ in the output type:
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HD9408.3B.1: configurable 0…5V or 1…5V analogue voltage output and digital RS232, RS422 or RS485 output. Standard MODBUS-RTU and NMEA 0183 protocols.
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HD9408.3B.2: active configurable 0…20mA or 4…20mA current output and digital RS232, RS422 or RS485 output. Standard MODBUS-RTU and NMEA 0183 protocols.
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HD9408.3B.3: Digital SDI-12 output, compatible with version 1.3 of the protocol.
The watertight housing with IP67 protection degree allows the use of the instrument even in harsh environments.
The instrument is particularly suitable for meteorological applications (AWOS – Automated Weather Observing Systems), environmental monitoring systems, meteorological and environmental data logging, measurement laboratories, atmospheric pressure compensation in the performance of internal combustion engines, barometric pressure compensation in clean rooms, vehicle emission test.
Its low power consumption makes it ideal for remote acquisition systems such as automatic weather stations powered by solar cells.
Characteristics:
High-Accuracy Piezoresistive Sensor
Measures atmospheric pressure with extreme precision, offering a range of 0 to 1350hPa (digital) and 500 to 1200hPa (analog). Ensures consistent accuracy with
low hysteresis and excellent repeatability.
Temperature Compensation for Optimal Performance
Maintains accuracy across a wide temperature range (-40°C to +85°C) through factory calibration and real-time temperature compensation.
Low Power Consumption
Energy-efficient design ideal for remote systems, such as solar-powered weather stations.
Broad Application Range
Perfect for meteorology, environmental monitoring, laboratories, clean rooms, and vehicle emission testing, ensuring reliable data in demanding conditions.
Versatile Output Options
Available in three versions with different output types (digital and analog), providing flexibility for various applications.
MODBUS RTU and SDI-12 Protocols
Supports MODBUS RTU and SDI-12 communication protocols for easy integration into data systems and sensor networks. Measurements can be displayed in various user-selectable units.
Rugged and versatile design
IP67-rated watertight housing makes it ideal for harsh environments and meteorological applications
Technical data:
Measurement
Sensor: High accuracy piezoresistive
Measuring range:
HD9408.3B.1: 0…1350hPa digital outputs / 500…1200hPa analog outputs
HD9408.3B.2: 0…1350hPa digital outputs / 500…1200hPa analog outputs
HD9408.3B.3: 100…1350 hPa
Resolution: 0.01 hPa
Accuracy:
Digital outputs:
±0.1hPa (500…1200hPa) / ±0.2hPa (remaining range) @ +23°C
±0.3hPa (500…1200hPa) / ±0.4hPa (remaining range) @-40…+85°C
Analog outputs:
±0.3hPa (500…1200hPa) @ +23°C
±0.6hPa (500…1200hPa) @-40…+85°C
Measuring units (Modbus and SDI-12 protocols):
Pa, hPa, kPa, mbar, bar, atm, psi, mmHg, inHg, mmH2O, ftH2O, kg/cm2, Torr
Long-term stability @ +25°C: 0.25 hPa/year
Output variants:
HD9408.3B.1: RS485 / RS422 / RS232 / analog 0…5 or 1…5V
HD9408.3B.2: RS485 / RS422 / RS232 / analog 0…20 or 4…20mA
HD9408.3B.3: SDI-12
Warm-up time: 2s approx. from powering
Measuring period:
HD9408.3B.1: 16ms
HD9408.3B.2: 16ms
HD9408.3B.3: upon user request
Analog output response time:
150ms to reach 90% of final value with step pressure input (from 600 to 1000hPa)
Overpressure limit: 3 x f.s.
Compatible media: Only dry air and non-corrosive gases
General
Power supply:
HD9408.3B.1: 10…30VDC
HD9408.3B.2: 10…30VDC
HD9408.3B.3: 8…30VDC
Absorbtion:
HD9408.3B.1: <10mA @ 12VDC
HD9408.3B.2: <10mA @ 12VDC
HD9408.3B.3: <200µA @ 12VDC
(average consumption between two subsequent measurements)
Pressure connection: Ø5mm flexible tube
Electrical connections: M12
The connection cable is optional and has to be ordered separately
Operating conditions: -40...+85°C
0…100%RH
Storage temperature: -40...+85 °C
Housing material: Anticorodal aluminium alloy
Housing dimensions: 120 x 58 x 33mm³
Protection degree: IP67
Optional accessories:
CP18… Cable with 8-pole M12 connector on one end, open wires on the other end.
Length 5m (CP18.5) or 10m (CP18.10). For HD9408.3B.1 and HD9408.3B.2.
CPM12AA4… Cable with 4-pole M12 connector on one end, open wires on the other end.
Length 5m (CPM12AA4.5) or 10m (CPM12AA4.10).
For HD9408.3B.3.
RS51K Kit for connecting the transmitter RS485 output to a PC.
It includes the SWD10 power supply and the RS485/USB adapter with:
o screw terminals for the connection to the CP18.x cable (not included)
o USB connector for the connection to the PC
o jack connector for connecting the SWD10 power supply.
RS52 Serial connection cable with built-in RS232/USB converter.
USB connector for the PC and screw terminals on the instrument side.
