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GE RPT 301 manuel d'utilisation

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Table des matières du manuel d’utilisation

  • Page 1

    RPT 301 Digital Output Pressur e Transducer User Manual K177 GE Sensing[...]

  • Page 2

    © General Electric Company. All rights reserved.[...]

  • Page 3

    K177 Issue No. 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 [...]

  • Page 4

    K177 Issue No. 3[...]

  • Page 5

    RPT 301 User Manual i K177 Issue No. 3 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.  This manual contains operating and safety instruction[...]

  • Page 6

    K177 Issue No. 3 ii 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. EMC electromagnetic compatibility FS full-scale IEC International Electrical Council inHg inch of mercury kg/cm 2 kilogram per centimetre squared kPa kilo Pascal mA milli[...]

  • Page 7

    RPT 301 User Manual ii i K177 Issue No. 3 Table of Contents 1 Introduction ................................... 1 1.1 Description ................................................ 1 1.2 Specification .............................................. 1 2 Installation ..................................... 4 2.1 Mounting the Transducer ....................[...]

  • Page 8

    K177 Issue No. 3 iv RPT 301 User Manual[...]

  • Page 9

    K177 Issue No. 3 RPT 301 User Manual 1 1 Introduction 1.1 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 I[...]

  • Page 10

    K177 Issue No. 3 2 RPT 301 User Manual Power supply Electrical Safety: .......................................... E N61 010 (I EC 1 010 ) as app lic abl e Voltage .............................................................. 4.5 to 32 V DC Power .......................... 0.6 Watts at 5 V to 0.75 Watts at 32 V Electromagnetic compatibility .......[...]

  • Page 11

    K177 Issue No. 3 RPT 301 User Manual 3 Accessories The following items are delivered with the instrument after manufacture.  User manual K177 (this publication)  Calibration certificate  Mating electrical connector (if ordered)[...]

  • Page 12

    K177 Issue No. 3 4 RPT 301 User Manual Figure 2-1 Mounting Arrangement 2.2 Pressure Connection The pressure port is a G1/8. If a pipe is connected to this port a bonded seal must be used. The instrument is very sensitive to air movement (small local pressure changes), when the pressure port is directly sensing the atmosphere, the fitting of a filte[...]

  • Page 13

    K177 Issue No. 3 RPT 301 User Manual 5 Figure 2-2 Instrument Dimensions[...]

  • Page 14

    K177 Issue No. 3 6 RPT 301 User Manual Power supply The instrument is internally fused with reverse polarity and overvoltage protection. Note: The power input is transformer isolated from the logic circuits and the serial data link. The isolation voltage is 50V dc. For continuous operation the ‘Start-up’ connections should be connected to the s[...]

  • Page 15

    K177 Issue No. 3 RPT 301 User Manual 7 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. If necessary, when using a supply gr[...]

  • Page 16

    K177 Issue No. 3 8 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 se[...]

  • Page 17

    K177 Issue No. 3 RPT 301 User Manual 9 Figure 2-3 Changing the communication interface PL3 LK2 B B LK1 A B PL1[...]

  • Page 18

    K177 Issue No. 3 1 0 RPT 301 User Manual connect screen to connector shell screened cable computer enclosure RPT 301 Screening to ensure EMC performance 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 instrume[...]

  • Page 19

    RPT 301 User Manual 1 1 K177 Issue No. 3 3 Operation 3.1 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 whi[...]

  • Page 20

    1 2 RPT 301 User Manual K177 Issue No. 3 Command Summary Table * Short form of the 'R<CR>' command Command Function Measurement R Return stored read ing <CR> * Return stored read ing G Get New Rea ding A Auto send r eading X Auto send fr om power-up Set-up U Set un its F Set fil ter B Set r eading resolution O Set communicat i[...]

  • Page 21

    RPT 301 User Manual 1 3 K177 Issue No. 3 3.3 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. All command fields must be separated by a comma. The instrument acce[...]

  • Page 22

    1 4 RPT 301 User Manual K177 Issue No. 3 2. 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 consecuti[...]

  • Page 23

    RPT 301 User Manual 1 5 K177 Issue No. 3 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). Co[...]

  • Page 24

    1 6 RPT 301 User Manual K177 Issue No. 3 Error Message Format The form of the error message: ERROR nn - where nn is a decimal number Defined error numbers are: 01 - Bad command 02 - Bad password 04 - Bad data detected by checksum 08 - Data out of range 16 - Hardware fault 32 - Pressure outside range 64 - System not ready Error messages are sent whe[...]

  • Page 25

    RPT 301 User Manual 1 7 K177 Issue No. 3 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. Command: R Reply: nnnnnnn<SP>UNITS Where: ‘nnnnnnn’ is the st[...]

  • Page 26

    1 8 RPT 301 User Manual K177 Issue No. 3 Command: A,nnnnnn Where: ‘nnnnnn’ is a number between 1 and 999999. This is the 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’ command. X - Auto Send from switch-on The [...]

  • Page 27

    RPT 301 User Manual 1 9 K177 Issue No. 3 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: * 0 - mbar 13 - mH 2 0 1 - Pa 14 - torr 2 - kPa 15 - atm 3 - MPa 16 - psi 4 - hPa 17 - lb/ft 2[...]

  • Page 28

    2 0 RPT 301 User Manual K177 Issue No. 3 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. This gives an unfiltered response to non-noise step changes. step takes a[...]

  • Page 29

    RPT 301 User Manual 2 1 K177 Issue No. 3 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 [...]

  • Page 30

    2 2 RPT 301 User Manual K177 Issue No. 3 S - Status This command returns the instrument status. Command: S 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. Result: no change I - Identity This command r[...]

  • Page 31

    RPT 301 User Manual 2 3 K177 Issue No. 3 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.  The following procedures should be carried out in a controll[...]

  • Page 32

    2 4 RPT 301 User Manual K177 Issue No. 3 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[...]

  • Page 33

    RPT 301 User Manual 2 5 K177 Issue No. 3 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’ link and switching off and then on. Note: Restoring the defaults rest[...]

  • Page 34

    2 6 RPT 301 User Manual K177 Issue No. 3 5 Maintenance 5.1 General User maintenance on this instrument is limited to checking the LED indicator, a diagnostic mode and cleaning the case. 5.2 LED Indicator With the lid of the instrument removed, an LED located on the PCB flashes when a pressure conversion is carried out. This indicates that the instr[...]

  • Page 35

    RPT 301 User Manual 2 7 K177 Issue No. 3 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)<[...]

  • Page 36

    2 8 RPT 301 User Manual K177 Issue No. 3 5.5 Approved Service Agents Find approved agents for the servicing of Druck Instruments at: www.gesensing.com[...]