Delta OHM HD9408.3B Operating Manual
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Delta OHM HD9408.3B Operating Manual

Delta OHM HD9408.3B Operating Manual

Barometric transmitter
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Operating manual
Barometric transmitter
HD9408.3B
www.deltaohm.com
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Summary of Contents for Delta OHM HD9408.3B

  • Page 1      English Operating manual Barometric transmitter HD9408.3B Companies / Brands of GHM www.deltaohm.com Keep for future reference.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ....................3     DESCRIPTION ....................... 4     INSTALLATION ..................... 5     HD9408.3B.1 HD9408.3B.2 ..... 5   LECTRICAL CONNECTIONS OF THE MODELS   3.1.1 RS485 ................5   CONNECTION   3.1.2 RS422 ................6  ...

  • Page 3: Introduction

    INTRODUCTION HD9408.3B is a barometric transmitter that uses a piezoresistive high accuracy and temperature-compensated sensor. It allows measuring the atmospheric pressure in the range 0…1350 hPa (digital outputs) or 500...1200 hPa (analog outputs), providing extreme accuracy and time stability, with excellent repeatability, low hysteresis, and excellent temperature behavior.

  • Page 4: Description

    2 DESCRIPTION Housing mounting holes. M12 connector for power supply and outputs. Barometric pressure input. HD9408.3B V1.2...

  • Page 5: Installation

    HD9408.3B.1 HD9408.3B.2 LECTRICAL CONNECTIONS OF THE MODELS The transmitters HD9408.3B.1 and HD9408.3B.2 have an 8-pole M12 male connector. On request, CP18… cables with 8-pole M12 female connector and 2 or 5 m standard length are available (other lengths on request).

  • Page 6: Rs422 Connection

    Each transmitter placed on the network is univocally identified by an address. Trans- mitters having the same address shall not be present in the network. NMEA, MODBUS-RTU and Delta OHM proprietary protocols can be used with RS485 connection. Before connecting the instrument to the network, configure address and Baud Rate (see paragraph 4.5).

  • Page 7: Rs232 Connection

    1200m. The data line must be kept separated from any power lines in order to prevent interferences on the transmitted signal. NMEA, MODBUS-RTU and Delta OHM proprietary protocols can be used with RS422 connection. Before connecting the instrument to the network, configure address and Baud Rate (see paragraph 4.5).

  • Page 8: Electrical Connections Of The Model Hd9408.3B.3

    3.2 E HD9408.3B.3 LECTRICAL CONNECTIONS OF THE MODEL The transmitter HD9408.3B.3 has a 4-pole M12 male connector. On request, CPM12AA4… cables with flying 4-pole M12 connector with 2 or 5 m standard length are available (other lengths on request). CPM12AA4… cable...

  • Page 9: Configuration

    HOOSING THE DIGITAL OUTPUT TYPE IN MODELS The models HD9408.3B.1 and HD9408.3B.2 allow selecting the type of digital output (RS232, RS422 or RS485) on hardware level, by means of dip switches on the elec- tronic board, or at software level, by means of an appropriate serial command. By de- fault, the RS485 output via the dip switches is set.

  • Page 10: Selecting The Unit Of Measurement

    0.001 Torr With the NMEA 0183 standard protocol, the pressure value is transmitted in two fixed units: Pa and bar. With the Delta OHM proprietary protocol, the pressure is transmit- ted in the fixed units mbar, psi and hPa. 4.4 C ONFIGURING THE ANALOG OUTPUT The analog output in the models HD9408.3B.1 and HD9408.3B.2 is factory preset to...

  • Page 11: Serial Commands Of Delta Ohm Protocol For Hd9408.3B.1 And Hd9408.3B.2

    Delta OHM proprietary protocol. The Delta OHM proprietary protocol can be used with RS232, RS485 and RS422 digital outputs. If the RS232 output is used and the PC has only USB ports, place between the PC and the instrument a RS232/USB converter.
  • Page 12 7. To go back to the operating protocol, send the command # (35 decimal code AS- CII character followed by the Enter key) or power cycle the instrument. TAB. 4.5.1: serial commands for HD9408.3B.1 and HD9408.3B.2 Command Reply...
  • Page 13 NMEA mode to nnnn seconds. The interval must be between 1 and 3600 seconds. Preset to 1 second. & nnnn| Reads the setting of the sending interval of the string with the measurements in NMEA mode. - 13 HD9408.3B V1.2...

  • Page 14: Serial Commands Of Delta Ohm Protocol For Hd9408.3B.3

    ERIAL COMMANDS OF ELTA PROTOCOL FOR In the model HD9408.3B, the operating parameters can be set in two ways: • directly with the SDI-12 protocol, via the extended commands described in chap- ter 7; • by connecting the transmitter to the PC through a converter from SDI-12 to RS232 or USB, and by sending, via a standard serial communication program, the serial commands of the Delta OHM proprietary protocol.
  • Page 15 6. Send the serial commands reported in table 4.6.1 to configure the transmitter or read the current settings. 7. To go back to the operating protocol, power cycle the instrument. TAB. 4.6.1: serial commands for HD9408.3B.3 Reply Description Instrument general information...
  • Page 16 The parameter must be between -1000 (=-10.00 hPa) and +1000 (=+10.00 hPa). For positive values, always indicate also the + sign. Preset to 0. & ##.##| Reads the offset set for the pressure measurement. - 16 HD9408.3B V1.2...

  • Page 17: Modbus-Rtu Protocol

    CMA (sets the address), CMB (sets the Baud Rate), CMP (sets the parity and the stop bits) and CMW (sets the receiving mode) of the Delta OHM proprietary protocol (see the parameters set- ting procedure in paragraph 4.5).
  • Page 18 1 ⇒ Respects the protocol and waits for 3.5 characters after the transmission Preset to 1 ⇒ Respects the protocol. TAB. 5.2.2: MODBUS Coils Register Register Datum number address Permanent storage of the parameters. - 18 HD9408.3B V1.2...

  • Page 19: Configuration Register

    Timeout of the temperature measurement Error in the management of the analog output Invalid data format 12…15 Not used The register is reset after the reading. If the error condition persists, the correspond- ing bit is restored. - 19 HD9408.3B V1.2...

  • Page 20: Nmea Protocol

    The interval is factory- set to 1 second and can be configured within 1 and 3600 seconds. To change the in- terval you should send the serial command CPD of the Delta OHM proprietary protocol (see the parameters setting procedure in paragraph 4.5).

  • Page 21: Sdi-12 Protocol

    7 SDI-12 PROTOCOL The HD9408.3B.3 transmitter is equipped with an SDI-12 communication interface compliant with the version 1.3 of the protocol, which allows the connection to SDI-12 sensors networks. The communication parameters of the protocol are: • Baud rate = 1200 •...
  • Page 22 = number of detected variables (1 character) n is fixed to 1 aD0! a+xx.xxxx<CR><LF> Reads the measurements of atmospheric pressure in ⇒ Example of response: 0+14.7953 psi. The instrument with address 0 measures 14.7953 PSI - 22 HD9408.3B V1.2...
  • Page 23 The instrument with address 0 measures 1020.1 in units of measurement. the set pressure unit of measurement and 28.3 in the set temperature unit of measurement (accuracy of temperature measurement: ± 1 °C) - 23 HD9408.3B V1.2...
  • Page 24 Sets the temperature unit of measurement: x=C ⇒ °C, x=F ⇒ °F Preset to C ⇒ °C aXSRAT! a&x|<CR><LF> Reads the set temperature unit of measurement (see the command aXSCPTx! for the unit of measurement corresponding to the value - 24 HD9408.3B V1.2...
  • Page 25 <CR><LF>. The format of these commands is obtained from the previous by adding the letter C: aMC!, aM1C!, aM2C!, aM3C!, aM4C!, aCC!. For more information about the protocol, visit the website "www.sdi-12.org". - 25 HD9408.3B V1.2...

  • Page 26: Technical Specifications

    Only dry air and non corrosive gases Power supply 10…30 Vdc Absorption < 10 mA @ 12 Vdc for HD9408.3B.1 and HD9408.3B.2 < 200 µA @ 12 Vdc for HD9408.3B.3 (average consumption be- tween two subsequent measurements) Pressure connection Ø 5 mm flexible tube Electrical connections Operating conditions -40...+85 °C / 0…100% RH...
  • Page 27 DIMENSIONS (mm): - 27 HD9408.3B V1.2...

  • Page 28: Instrument Storage

    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 law regulations on workplace safety. • Accident prevention regulations. - 28 HD9408.3B V1.2...

  • Page 29: Ordering Codes

    Serial connection cable with built-in USB/RS232 converter. USB con- nector for the PC and screw terminals on the instrument side. DELTA OHM metrology laboratories LAT N° 124 are ISO/IEC 17025 accredited by ACCREDIA for Temperature, Humidity, Pressure, Photometry / Radiometry, Acous- tics and Air Velocity.
  • Page 30 Notes - 30 HD9408.3B V1.2...

  • Page 32: Serial Number

    All DELTA OHM instruments are subject to accurate testing, and are guaranteed for 24 months from the date of purchase. DELTA OHM will repair or replace free of charge the parts that, within the warranty period, shall be deemed non efficient according to its own judgement. Complete replacement is excluded and no damage claims are accepted.
  • Page 33 GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY Phone +39 049 8977150 | Fax +39 049 635596 www.deltaohm.com | info@deltaohm.com The quality level of our instruments is the result of the constant development of the product. This may produce some differences between the information written in this manual and the instrument you have purchased.
  • Page 34 GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY Phone +39 049 8977150 | Fax +39 049 635596 www.deltaohm.com | info@deltaohm.com V1.2 07/11/2017...

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