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GHM Delta OHM HD404 Series Operating Manual

Low pressure transmitters
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Operating manual
Low pressure transmitters
HD404... series
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Summary of Contents for GHM Delta OHM HD404 Series

  • Page 1 English Operating manual Low pressure transmitters HD404… series www.deltaohm.com Keep for future reference.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS INTRODUCTION ....................3 TECHNICAL CHARACTERISTICS ................5 INSTALLATION ..................... 8 ................... 10 LECTRICAL CONNECTIONS ..............11 XAMPLE OF CONNECTION TO A ITOT TUBE HD9022 ........12 XAMPLES OF CONNECTION WITH INDICATOR REGULATOR CONFIGURATION ....................13 (HD404T…) ........ 13 ONFIGURATION OF THE MODELS WITH ANALOG OUTPUT RS485 (HD404ST…) .......

  • Page 3: Introduction

    1 INTRODUCTION The series of HD404… transmitters is able to measure relative pressures with refer- ence to the atmosphere or differential in the range: • from 50 to 1000 Pa (from 0.2” H O to 4” H O) for the versions with analog output; •...
  • Page 4 Models with analog output HD404T “” = pressure output SR = speed output (only G versions) “” = without LCD L = with LCD “” = without auto-zero circuit (only HD404T3… and HD404T4…) AZ = with auto-zero circuit D = differential pressure –f.s.…+f.s. G = relative pressure with respect to the atmosphere 0…+f.s.

  • Page 5: Technical Characteristics

    2 TECHNICAL CHARACTERISTICS Sensor Piezoresistive Measuring range See tables 2.1 and 2.2 Resolution 0.1 Pa for HD404ST2… 0.5 Pa for f.s. up to 500 Pa (except Hd404ST2…) 1 Pa for f.s. 1000 Pa 0.1 mbar for HD404ST5… 0.05 mmH O for f.s. up to 50 mmH 0.1 mmH O for f.s.
  • Page 6 TAB. 2.1: pressure measuring ranges, accuracy and long term stability ACCURACY LONG-TERM MEASURING RANGE (@ 0…+50 °C) STABILITY MODEL HIGH NO AZ NO AZ MODELS WITH ANALOG OUTPUT (HD404T…) Pa (HD404TxP…) HD404T1PGAZ… 0...50 0...100 HD404T2PGAZ… 0...100 0...250 HD404T3PG… 0...250 0...500 ±1% f.s.
  • Page 7 TAB.2.2: Speed full scale in the models with SR option ANALOG OUTPUT MAX SPEED MEASURABLE MODEL DEFAULT FULL SCALE (m/s) (m/s) HIGH HD404TxP…SR HD404T1PGAZ…SR 9.06 12.82 HD404T2PGAZ…SR 12.82 20.27 HD404T3PG…SR 20.27 28.67 HD404T4PG…SR 28.67 40.55 HD404TxM…SR HD404T1MGAZ…SR 8.98 12.70 HD404T2MGAZ…SR 12.70 20.08 HD404T3MG…SR...
  • Page 8 Change of the max. speed with the barometric pressure at constant temperature (mm) IMENSIONS HD404… V1.2...

  • Page 9: Installation

    3 INSTALLATION By opening the lid, 3 mm diameter holes are available so to allow securing the base of the instrument directly to a panel or to the wall Internally there are: • the terminal header for connecting the power supply and the output; •...

  • Page 10: Electrical Connections

    The instruments can be mounted in any position, but typically they are fixed on a ver- tical wall with the pressure inputs facing down. The deviation of the zero due to the mounting position can be corrected by using the CAL ZERO button.

  • Page 11: Example Of Connection To A Pitot Tube

    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 instrument has a built-in line termination that can be connected or removed through a short jumper placed next to the terminal block.

  • Page 12: Examples Of Connection With Hd9022 Indicator / Regulator

    3.3 E HD9022 XAMPLES OF CONNECTION WITH INDICATOR REGULATOR Power supply 4…20 mA current output Power supply 0…10 Vdc voltage output HD404… V1.2...

  • Page 13: Configuration

    4 CONFIGURATION 4.1 C (HD404T…) ONFIGURATION OF THE MODELS WITH ANALOG OUTPUT The transmitter can be configured by using the dip switches on the circuit board and via the serial communication port COM AUX. Configuration via dip switches: Dip switches RANGE: selection of the LOW or HIGH range for the analog output. Dip switches FAST/SLOW: selection of the response time for the analog output.
  • Page 14 Command Response Description Model Enables flow mode. description Model Enables speed mode (default). description Model Sets m /min as flow unit of measurement . description Model Sets L/s as flow unit of measurement. description CK n.n… Sets the Pitot or Darcy tube coefficient to the value n.n… &...

  • Page 15: Configuration Of The Models With Rs485 Output (Hd404St

    4.2 C RS485 (HD404ST…) ONFIGURATION OF THE MODELS WITH OUTPUT RS485 Modbus address: each transmitter of the network is univocally identified by an address between 1 and 247. Transmitters having the same address shall not be present in the network. The transmitter Modbus address is equal to the sum of the value set with the dip-switches 2…6 (value settable from 0 to 31) and the value set with the serial command WA (value settable from 1 to 216, default = 1).
  • Page 16 Command Description Disables the alternating display of speed (or flow) and pressure. OPT3D Automatic change of speed resolution on display (0,1 ⇔ 0,01) depending on the OPT4E measured value. Fixed centesimal speed resolution on display. OPT4D Enables “Debimo” sensor. OPT6E Enables Pitot sensor (default).

  • Page 17: Notes On The Configuration Of The Models With Sr Option

    Note: To exit the configuration mode after sending the CAL START command, send the CAL END command (the transmitter automatically exits the configuration mode af- ter 5 minutes from the last command sent). 4.3 N OTES ON THE CONFIGURATION OF THE MODELS WITH OPTION Resolution of the speed measurement: The speed is calculated from the pressure measure through a quadratic relationship.

  • Page 18: Modbus-Rtu Protocol (Hd404St

    5 MODBUS-RTU PROTOCOL (HD404ST…) To operate with the Modbus-RTU protocol be sure that the dip-switch 1 (the one closest to the terminal block) is set to OFF (downwards). The dip-switch can be set to OFF even if the transmitter is powered, and the change is effective immediately. Below is the list of registers: TAB.
  • Page 19 Error register The bits of the error register signal, if set to 1, anomalies in the measurement. The bit 0 (the less significant one) indicates a measurement over-range of the transmitter. The bit 1 indicates whether the measurement is less than the minimum measurable (under-range).

  • Page 20: Instrument Storage

    INSTRUMENT STORAGE Instrument storage conditions: • Temperature: -20...+70 °C. • Humidity: less than 90 %RH no condensation. • In storage, avoid places where: • humidity is high; the instrument is exposed to direct sun radiation; • the instrument is exposed to a high temperature source; •...

  • Page 21: Accessories Ordering Codes

    ACCESSORIES ORDERING CODES Accessories included: Silicone tube, internal ∅ 5 mm / external ∅ 8 mm, length 2 m. • Two plastic fittings (HD434T.5). • Optional accessories: RS27 RS232 null-modem serial connection cable with SubD 9-pin connector on the PC side and 3-pole connector on the instrument side.
  • Page 22 Pitot tubes: In stainless steel, for measuring the air speed. The models with TC suffix also measure the temperature with K thermocouple sensor. Supplied with two pieces of silicone tube, internal Ø 4 mm / external Ø 6 mm, length 1.5 m. Operating Temp.
  • 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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