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GHM DeltaOHM BAROsense Operating Manual

Barometric transmitter
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Operating manual
Barometric transmitter
BAROsense
www.deltaohm.com
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Summary of Contents for GHM DeltaOHM BAROsense

  • Page 1 English Operating manual Barometric transmitter BAROsense www.deltaohm.com Keep for future reference.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ..................3 TECHNICAL SPECIFICATIONS ..............4 INSTALLATION ..................6 3.1 E ................ 7 LECTRICAL CONNECTIONS CONFIGURATION AND MEASUREMENT ............. 9 ASCII PROPRIETARY PROTOCOL ............10 MODBUS-RTU PROTOCOL ................ 15 SAFETY INSTRUCTIONS ................18 ORDERING CODES .................. 19 BAROsense V1.2...

  • Page 3: Introduction

    INTRODUCTION BAROsense is a barometric transmitter equipped with a precision piezo-resistive pressure sensor with integrated temperature sensor. The pressure and temperature measurements are digitally processed to obtain a pressure output value compensated over the whole transmitter temperature operating range. The sensor is factory calibrated in multiple points and has excellent time stability and re- peatability.

  • Page 4: Technical Specifications

    TECHNICAL SPECIFICATIONS Barometric pressure Sensor Piezoresistive Measuring range 300…1100 hPa Configurable for the analog output: default 600…1100 hPa Resolution See table below Accuracy ± 0.5 hPa (700...1100 hPa) @ 20 °C ±1 hPa (500…1100 hPa) / ±1.5 hPa (300…500 hPa) @ T=(0…60 °C) Long-term stability <...
  • Page 5 Materials Transmitter: Polycarbonate, pressure input in nickel-plated brass Static port (optional): ASA Support bracket: Aluminium alloy Housing dimensions 120 x 80 x 55 Weight 250 g approx. 570 g approx. the static port with support bracket Protection degree IP65 Units of measurement available and corresponding resolution With the MODBUS-RTU protocol, two different input registers are available for the pressure measurement, with different resolution: IR 0 (32-bit) and IR 2 (16-bit).

  • Page 6: Installation

    3 INSTALLATION The transmitter is wall mounted using the two holes on the back (open the cover to access the holes and the terminal header for electrical connections). Ø4.4 (2x) Fig. 3.1: fixing holes It is advisable to mount the transmitter so that the pressure input is facing down- wards, in order to reduce the accumulation of dust and dirt on the input.

  • Page 7: Electrical Connections

    3.1 E LECTRICAL CONNECTIONS The transmitter has an internal screw terminal header. Cable gland Pressure input Fig. 3.3: internal terminal header and selection jumpers Terminal N° Function RS485 D- RS485 D+ Power supply positive (+Vdc) Analog output (OUT) The analog output, if present, can be in current or voltage, configurable via the jump- er to the right of the terminal header.
  • Page 8 Other sensors with PLC, data logger or RS485 output RS485/USB or RS485/RS232 converter for PC Termination 220Ω 220Ω Shield Lmax = 1200m Shield Termination Fig. 3.5: RS485 connection BAROsense V1.2...

  • Page 9: Configuration And Measurement

    4 CONFIGURATION AND MEASUREMENT The configuration of the instrument and the reading of the measurements can be done via the RS485 serial output, both with the proprietary protocol and with the MODBUS- RTU protocol. In the first 10 seconds after the instrument power on, it is always active the proprie- tary protocol.

  • Page 10: Ascii Proprietary Protocol

    5 ASCII PROPRIETARY PROTOCOL To use the ASCII proprietary protocol, it is necessary to connect the instrument to the PC via a RS485/USB or RS485/RS232 converter and use a standard serial communica- tion program. In the serial communication program, set the COM port number to which the instrument is connected and the communication parameters as follows: •...
  • Page 11 RS485 communication parameters: Command Reply Description CMBn &| Sets the Baud Rate: ▪  1200 if n=0 19200 if n=4 ▪  2400 if n=1 38400 if n=5 ▪  4800 if n=2 57600 if n=6 ▪  9600 if n=3 115200 if n=7 Default : 19200 (n=4) &...
  • Page 12 Units of measurement: Command Reply Description &| Sets the pressure unit of measurement of index n:  Torr if n=0  Pa if n=1  hPa if n=2  kPa if n=3  mbar if n=4  psi if n=5 ...
  • Page 13 Analog output: Command Reply Description Current output CAOn &| Enable/disable the offset of the current analog output:  Offset disabled if n=0 (0…20 mA)  Offset enabled if n=1 (4…20 mA) Default : Offset enabled (n=1) & n| Reads the setting of the offset for the current analog output.
  • Page 14 Command Reply Description & n| Reads the minimum pressure value for the voltage ana- log output (see Note 1 below). CVHn &| Sets n as the maximum pressure value for the voltage analog output. For the value n to be entered, see Note 1 below. Default : 110000 (=1100.00 hPa) &...

  • Page 15: Modbus-Rtu Protocol

    6 MODBUS-RTU PROTOCOL By default, the instrument has MODBUS address 1 and communication parameters 19200, 8E1. The address and the communication parameters can be changed by using the appropriate serial commands of the proprietary protocol or, alternatively, directly with MODBUS commands by changing the value of the Coils and Holding Registers de- scribed later.
  • Page 16 Address Description Format Enable/disable the offset of the voltage analog output: 0=offset disabled (default, 0…1/0…5/0…10 V) 1=offset enabled (0,2…1/1…5/2…10 V) Sets the direct or reversed correspondence between voltage analog output and pressure: 0=direct (default, Min. V  Min. press., Max. V  Max. press.) 1=reversed (Min.
  • Page 17 Address Description Format Maximum pressure value for the current analog output. 32-bit Integer For the value, see Note 3 below. Default : 110000 (=1100.00 hPa) Minimum pressure value for the voltage analog output. 32-bit Integer For the value, see Note 3 below. Default : 60000 (=600.00 hPa) Maximum pressure value for the voltage analog output.

  • Page 18: Safety Instructions

    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 meas- urement, control and laboratory use” and has left the factory in perfect safety tech- nical conditions.

  • Page 19: Ordering Codes

    ORDERING CODES BAROsense Static port: Blank = without static port K = with static port + bracket LCD: Blank = without LCD L = with LCD Output: M = RS485 Modbus-RTU 1 = RS485 Modbus-RTU + analog 0/4…20 mA or 0…1 V 5 = RS485 Modbus-RTU + analog 0/4…20 mA or 0…5 V...
  • Page 20 OTES BAROsense V1.2...
  • Page 21 OTES BAROsense V1.2...
  • Page 22 OTES BAROsense V1.2...
  • Page 24 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 | sales@deltaohm.com WARRANTY Delta OHM is required to respond to the "factory warranty" only in those cases provided by Legislative Decree 6 September 2005 - n.

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