GE Sensing RPT 301 User Manual
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GE Sensing RPT 301 User Manual

GE Sensing RPT 301 User Manual

Digital output pressure transducer
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GE
Sensing
RPT 301
Digital Output Pressure Transducer
User Manual K177

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Summary of Contents for GE Sensing RPT 301

  • Page 1 Sensing RPT 301 Digital Output Pressure Transducer User Manual K177...
  • Page 2 © General Electric Company. All rights reserved.
  • Page 3 RPT 301 Digital Output Pressure Transducer User Manual K177 © Druck Limited 1998 This document is the property of Druck Limited and may not, either in part or whole, be copied or otherwise reproduced, communicated in any way to third parties, nor stored in any Data Processing System, without the express written authority of Druck Limited.
  • Page 4 K177 Issue No. 3...
  • Page 5 RPT 301 User Manual Safety The manufacturer has designed this instrument to be safe when operated using the procedures detailed in this manual. Do not use this instrument for any other purpose than that stated. Do not apply values greater than the maximum value stated.
  • Page 6 RPT 301 User Manual Abbreviations and Symbols The following abbreviations are used in this manual. Note: Abbreviations are the same in the singular and plural. electromagnetic compatibility full-scale International Electrical Council inHg inch of mercury kg/cm kilogram per centimetre squared kilo Pascal milli Ampere milli metre...

  • Page 7: Table Of Contents

    RPT 301 User Manual Table of Contents Introduction ........1 Description ..........1 Specification ..........1 Installation ........4 Mounting the Transducer ......4 Pressure Connection ........ 4 Electrical Connection ........ 6 Operation ........11 System Operation ........11 Command Summary ......... 11 General Command Format .......
  • Page 8 RPT 301 User Manual K177 Issue No. 3...

  • Page 9: Introduction

    RPT 301 User Manual Introduction Description The RPT 301 Digital Output Pressure Transducer measures air pressure applied to the connection port and produces an electrical output. It comprises a resonant sensor connected to a printed circuit board to produce a serial digital output and is contained in a metal enclosure to IP65 standard.
  • Page 10 RPT 301 User Manual Power supply Electrical Safety: .......... EN61010 (IEC 1010) as applicable Voltage .............. 4.5 to 32 V DC Power ......0.6 Watts at 5 V to 0.75 Watts at 32 V Electromagnetic compatibility ............EN50081-1 (emissions) ............. EN50082-2 (immunity) Switch on Settling Time: ...
  • Page 11 RPT 301 User Manual Accessories The following items are delivered with the instrument after manufacture. User manual K177 (this publication) Calibration certificate Mating electrical connector (if ordered) K177 Issue No. 3...

  • Page 12: Installation

    RPT 301 User Manual Installation Installation must be carried out by a qualified technician. Mounting the Instrument (Figure 2.1) The instrument can be mounted on a vertical surface using two screws or bolts to a maximum diameter of 4 mm. Figure 2-1 Mounting Arrangement Pressure Connection The pressure port is a G1/8.
  • Page 13 RPT 301 User Manual Figure 2-2 Instrument Dimensions K177 Issue No. 3...

  • Page 14: Electrical Connection

    RPT 301 User Manual Electrical Connection The electrical connector is a 10-way connector (MIL C26482) for serial, parallel and power connections. Instrument Connector - Plug, Amphenol 62GB 12E12 - 10P Cable Connector Socket, Amphenol 62GB 16F12 - 10S Communication connections When configured for: RS485 RS232...
  • Page 15 RPT 301 User Manual The start-up +ve and -ve connections must be connected for the instrument to operate. There are many ways of connecting the start-up facility for example: Power control The current consumed by the instrument is approximately 1 mA at 3 V, 2 mA at 5 V rising to 16 mA at 32 V.
  • Page 16 RPT 301 User Manual Communications The installed instrument is controlled by the serial data interface. Software or hardware handshaking can be used on the RS232 interface and only software handshaking on the RS485 interface. Changing the communication interface standard (Figure 2-3) The communication interface standard is set at manufacture to RS232 but can be changed as follows: Remove the lid of the instrument to gain access to the PCB.
  • Page 17 RPT 301 User Manual Figure 2-3 Changing the communication interface K177 Issue No. 3...
  • Page 18 RPT 301 User Manual Screening Make sure that the chassis connection between the control computer and the instrument is continuous. Use screened cable and bond the cable screening to the connector shell of the instrument and to the computer enclosure. computer screened cable enclosure...

  • Page 19: Operation

    RPT 301 User Manual Operation System Operation The frequency output from the sensor is counted for a fixed number of cycles. A mid-scale pressure gives a measurement period of approximately 0.5 seconds. During this time a high frequency clock is also being counted and at the end of the measuring cycle it is this value which is transferred to the processor for conversion into its pressure equivalent.
  • Page 20 RPT 301 User Manual Command Summary Table Command Function Measurement Return stored reading Return stored reading <CR> Get New Reading Auto send reading Auto send from power-up Set-up Set units Set filter Set reading resolution Set communication parameters Status Identity User calibration User calibration (linearity) Change protection PIN...

  • Page 21: General Command Format

    RPT 301 User Manual General Command Format The instrument is controlled by a sequence of single letter commands. Some commands require one or more numeric values to follow the letter, the correct number of parameters must be sent with this type of command.
  • Page 22 RPT 301 User Manual U, O; G; R; G; R; U, 16; G; R; G; R; G; R; A, 100 Reply: Reading 1 mbar Reading 2 mbar Reading 3 psi Reading 4 psi Reading 5 psi Then at 100 second intervals - Reading psi This command string sets the instrument units to mbar, returns two consecutive readings, changes units to psi, returns three consecutive readings and then selects auto-send mode with a period of 100 seconds...

  • Page 23: General Reply Format

    RPT 301 User Manual 3.4 General Reply Format For commands that have a reply string, the reply terminator <RT> is always transmitted and is always <CR> followed by <LF>. <RT> is expected with all commands but only shown in some of the following sections for clarity (e.g.: Section 5.3 Diagnostics Mode).
  • Page 24 RPT 301 User Manual Error Message Format The form of the error message: ERROR nn - where nn is a decimal number Defined error numbers are: Bad command Bad password Bad data detected by checksum Data out of range Hardware fault Pressure outside range System not ready Error messages are sent when an error is detected.

  • Page 25: Detailed Command Definitions

    RPT 301 User Manual 3.6 Detailed Command Definitions Measurement Commands R - Return stored reading This command retrieves the current stored reading, as the reading is the stored and filtered (if the filter is selected) there will be no delay in the reply.
  • Page 26 RPT 301 User Manual Command: A,nnnnnn Where: ‘nnnnnn’ is a number between 1 and 999999. This is period in seconds between successive transmissions. Reply: None Result: A reading is transmitted every nnnnnn seconds. The transmission format is the same as the reply of the ‘R’...
  • Page 27 RPT 301 User Manual Set-up Commands U - Unit Set-up This command sets the units of the pressure measurement; the selection is nonvolatile. Command: U,nn Where: ‘nn’ can be up to two digit number taking one of the following values: mbar torr lb/ft...
  • Page 28 RPT 301 User Manual F - Filter Set-up This command sets the instrument reading filter coefficients. Command: F, step, average Where: step is a pressure band within which the filter operates. If the pressure steps outside this band, the filter is bypassed.
  • Page 29 RPT 301 User Manual O - Set Communications Options This command sets the communication port parameters to match those of the control computer. Note: When changing these settings care must be taken to avoid losing communication with the instrument. If this should happen the default communications settings can be restored (those operational at the time of shipment) by moving Link 1 to the ‘A’...
  • Page 30 RPT 301 User Manual S - Status This command returns the instrument status. Command: Reply: STATUS nn Where nn: 01 = Frequency outside limits 02 = Diode voltage outside limits 04 = Electronics failure Combination errors: a status 06 represents diode voltage and electronics failure.

  • Page 31: Calibration

    RPT 301 User Manual 4 Calibration The instrument is supplied with a calibration certificate. For the instrument to stay accurate it is recommended that it is checked every 12 months. The use of a Class A compensated deadweight pressure standard is recommended.
  • Page 32 RPT 301 User Manual The calibration routine requires a minimum of two pressures within the operating extremes (maximum of six pressures). The instrument software calculates an offset and gain correction to be applied to all subsequent readings using a statistical best straight line method. For single point calibration, the gain factor is set to unity.
  • Page 33 RPT 301 User Manual P - Change PIN This command changes the PIN (Personal Identification Number) that protects the calibration data. The instrument is shipped with the PIN 000. If the PIN is lost, the default (000) may be restored by fitting the ‘default’...

  • Page 34: Maintenance

    RPT 301 User Manual Maintenance General User maintenance on this instrument is limited to checking the LED indicator, a diagnostic mode and cleaning the case. LED Indicator With the lid of the instrument removed, an LED located on the PCB flashes when a pressure conversion is carried out.

  • Page 35: Cleaning

    RPT 301 User Manual Mode 2 “K00”,Coeff 1<RT>...”K55",Coeff 25<RT>, ”KX”,Coeff X<RT>, ”KY”,Coeff Y<RT>, “CS”,RPT barometric checksum<RT>, “SN”,RPT serial number<RT>, “RH”,RPT max. operating pressure (mbar)<RT>, “LH”,RPT min. operating pressure (mbar)<RT>, “TYPE”,RPT type<RT> Mode 3 Frequency constant, pressure gain, pressure offset, diode volts offset Mode 4 DIODE = value - For every reading where value is the diode voltage in Mode 5...

  • Page 36: Approved Service Agents

    RPT 301 User Manual Approved Service Agents Find approved agents for the servicing of Druck Instruments at: www.gesensing.com K177 Issue No. 3...

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