RPT 301 - GE Measurement & Control
Contents
1. The manufacturer offers a comprehensive and if required NAMAS accredited calibration service Calibration Check calibration check should be carried out at chosen intervals The readings of the instrument should be compared with a pressure standard and after any adjustments for accuracy traced to National Standards the differences recorded The adjusted differences can then be compared with the required accuracy for the instrument If necessary a calibration adjustment can be carried out The recommended procedure is to check at increasing and then decreasing intervals of 0 20 40 60 80 and 100 of full scale C User Calibration Linearity Drift Compensation This command performs a best straight line fit to the remaining errors of the transducer or does a single pressure point correction Entering one pressure point causes the offset between the transducer and the pressure standard to be added subtracted across the whole pressure range Entering two pressure points near zero and near full scale cancels zero and full scale drift Entering more pressure points reduces the remaining non linearity and makes the zero and full scale correction more accurate K177 Issue No 3 24 301 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 subseque2. Note Restoring the defaults restores ALL of the factory settings including the communication parameters Command P PIN New PIN Where PIN is the existing 3 digit code 000 to 999 and New PIN is the replacement PIN Reply None Result PIN is replaced by New PIN K177 Issue No 3 26 5 1 5 2 5 3 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 This indicates that the instrument has power that the processor is functioning and the transducer frequency and diode voltage are within normal limits Diagnostic Mode D Diagnostic Mode This command places the instrument into the diagnostic mode Command D mode Where mode is a single digit Dump all 512 stored values Dump transducer coefficients checks LOAD L command Dump calibration factors i e gain offset etc Continuous output of sensor diode voltage temperature mV Continuous output of sensor frequency in Hz amp ND Result The reply depends on the mode as follows Mode 1 32 lines of output as follows nn nn nn nn nn nn nn nn nn nn nn nn nn nn nn lt RT gt where aaa hexadecimal address offset 0 to 1FFH and nn hexadecimal data K177 Issue No 3
3. Command X nnnnnn Where nnnnnn is a number between 0 and 999999 This is the transmission interval in seconds as for the A command A value of 0 disables the Auto send at switch on Reply None Result Instrument powers up in auto send mode with the selected transmission interval K177 Issue No 3 301 User Manual 19 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 3 mH 0 1 Pa 4 torr 2 kPa 15 atm 3 MPa 6 psi 4 hPa 7 Ib ft 5 bar 8 inHg 6 kg cm 9 inH 004 7 kg m 20 ftH 004 8 mmHg 21 mbar 9 cmHg 22 inH O20 10 mHg 23 ftH O20 11 mmH O 24 mbar 12 cmH 0 Note mbar can be selected using code 0 21 or 24 Reply None K177 Issue No 3 20 301 User Manual F Filter Set up This command sets the instrument reading filter coefficients Command F step average Where stepis 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 value expressed as a percentage 0 100 of full scale If step 0 then the filter is disabled average is the number of sequential readings 1 99 averaged by the filter High values effectively
4. 301 User Manual 27 5 4 Mode 2 K00 Coeff 1 lt RT gt K55 Coeff 25 lt RT gt KX Coeff X lt RT gt KY Coeff Y lt RT gt CS RPT barometric checksum lt RT gt SN RPT serial number lt RT gt RH RPT max operating pressure mbar RT LH RPT min operating pressure mbar lt RT gt TYPE RPT type lt RT gt 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 mV Mode 5 FREQUENCY value For every reading Where value is the sensor frequency measured in Hz Modes 4 and 5 are cancelled by any other command Cleaning Clean the external case of the instrument with a damp lint free cloth and mild detergent Make sure that there is no debris in the pressure port K177 Issue No 3 28 301 User Manual 5 5 Approved Service Agents Find approved agents for the servicing of Druck Instruments at www gesensing com K177 Issue No 3
5. a serial digital output and is contained in a metal enclosure to IP65 standard The instrument is designed to communicate with compatible equipment using a serial communications system which can be selected by the user for either RS232 or RS485 standard communications interface The power supply for the instrument is a wide tolerance DC voltage with a low power consumption A remote start up facility enables the instrument to be remotely switched on and off to save power 1 2 Specification Accuracy Non linearity hysteresis and repeatability Standard RER PR 0 0296 FS ORION A niii cnet tr hie 0 01 FS Temperature affects 0 02 FS over operating temperature range Long term stability Standard 150 ppm per 12 months PRE 100 ppm per 12 months Ranges 750 to 1150 mbar a 85 to 1300 mbar a 9b to 2620 mbar a 35 to 3500 mbar a Dimensions 0 65 kg Sr T i See S 125 mm x 80 mm x 57 mm Environment Operating temperature range 20 to 60 C Storage temperature range 40 to 80 C Seallmge MM c E EET IP65 K177 Issue No 3 2 301 User Manual Power supply Electrical Safety un EN61010 IEC 1010 as applicable Voltage 4 5 to 32V DC POWE a itia 0 6 Watts at 5 V to 0 75 Watts at 32 V rem EN50
6. mode are cancelled when a further command is received this should be used at the end of a command string Note The C L and T commands are interactive and are not suitable for multiple commands K177 Issue No 3 301 User Manual 15 3 4 General Reply Format 3 5 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 Command Terminator Command strings must end with the command terminator CT For Dumb Terminal applications press the carriage return or enter key With a Terminal Emulator communications application the application must be set up to give the required output when the carriage return or enter key is pressed For Custom applications CR decimal 13 or CRLF decimal 13 followed by decimal 10 must be added to the end of each complete command string CT is expected with all commands except for some interactive commands where further explanation is necessary e g Section 4 User Calibration Error Message Error messages are generated from two sources a The command decoder A command error causes the return of an error message and stops the rest of the command string The instrument sends an error message corresponding to the command error b A pressure sensor fau
7. specification K177 Issue No 3 301 User Manual 2 2 2 3 3 1 3 2 3 3 3 4 3 5 3 6 5 1 5 2 5 3 5 4 5 5 Table of Contents Introduction 1 Description 1 Specification 1 Installation 4 Mounting the Transducer 4 Pressure Connection 4 Electrical Connection samir 6 Operation eere eorr 11 System Operation 11 Comimand S MMA uus 11 General Command Format 13 General Reply 15 Error Message 15 Detailed Command Definitions 17 Calibration 23 Maintenance 26 G n rales re ate IDA eo 26 LED ue cos 26 Diagnostic Mode 26 EIEANING united 27 Approved Service Agents 28 K177 Issue No 3 iv RPT 301 User Manual K177 Issue No 3 301 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
8. 081 1 emissions D ec del EN50082 2 immunity Switch on Settling Time Less than 5 seconds with filtering disabled Pressure measurement Measurement cycle assises Fixed nominally 0 5 seconds Reading Filter Single pole low pass filter variable time constant and step response Reading Resolution Programmable number of decimal places Data Communications Serial RS232 or RS485 selectable Software or hardware handshaking on RS232 software handshaking only on RS485 Power Control Remote Start Up A floating volt free two wire control input is provided to enable the instrument to be remotely switched on or off Pressure connection E ee ee G1 8 female overpressure 1 25 x calibrated full scale pressure Containment sisia 5 bar a Pressure medium compatibility Dry gases compatible with Glass Silicon Titanium Stainless Steel and Epoxy adhesive Note Continuing development sometimes necessitates specification changes without notice K177 Issue No 3 301 User Manual 3 Accessories The following items are delivered with the instrument after manufacture o User manual K177 this publication o Calibration certificate o Mating electrical connector if ordered K177 Issue No 3 2 1 2 2 301 User Manual Installation Installation must be carried out by a qualified technician Mounting the In
9. Link 1 to the A Restore position and switching the power off and back on The link should then be moved back to the B Normal position If the link is left in the A Restore position it is not possible to permanently change the communications settings this may be considered useful in some applications Default on shipment is set to the command O 000 00 0 0 0 0 0 which means 9600 baud 8 data bits 2 stop bits no parity no handshake Command O PIN address baud data bits stop bits parity handshake Where PIN is a three character password 000 999 address always 00 baud rate value 0 7 0 9600 1 4800 2 2400 1200 4 600 5 300 6 150 7 75 data bits 0 for 8 data bits1 for 7 data bits stop bits 0 for 2 stop bits 1 for 1 stop bit parity 0 parity 1 even parity 2 odd parity handshake 0 no handshake 1 software handshake XON XOFF 2 hardware handshake RTS CTS Reply None When RS485 hardware has been selected the serial link is configured as full duplex with no hardware handshaking Handshake 2 is not valid for RS485 hardware K177 Issue No 3 22 301 User Manual 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 c
10. e which is transferred to the processor for conversion into its pressure equivalent Measurement cycles are continuous unless specifically interrupted see the G command Each cycle delivers a new pressure value to the programmable filter The output of this filter is stored in a buffer and may be requested by the control computer or sent automatically at a programmable interval to the control computer Command Summary The instrument has a range of commands summarised in the table and detailed in this section Some of these commands generate a reply from the instrument the general format of these replies is given in section 3 4 K177 Issue No 3 12 301 User Manual Command Summary Table Command Function Measurement R Return stored reading lt CR gt Return stored reading G Get New Reading A Auto send reading X Auto send from power up Set up U Set units F Set filter B Set reading resolution O Set communication parameters S Status Identity User calibration User calibration linearity P Change protection PIN CR CRLF Command Terminators Short form of the R CR command K177 Issue No 3 301 User Manual 13 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 mu
11. give the filter a long time constant Reply None B Set Resolution This command enables the decimal place of the reading to be adjusted Within the instrument s resolution see specification The reading resolution is automatically selected according to the instrument full scale and the units that have been selected using the units set up command An algorithm is used that gives a resolution which does not interfere with the accuracy of measurement and is as noise free as possible before filtering The set resolution command allows the number of decimal places of the transmitted value to be specified this overrides the automatic selection of resolution for the current selected units Changing units cancels any previous set resolution command The command is nonvolatile and remains selected until the units are changed Changing and restoring the units can be used to cancel the set resolution command Command B n Reply None Result Sets the transmitted number of decimal places to be n 0 5 max depends on units resolution K177 Issue No 3 301 User Manual 21 O Set Communications Options This commandsets the communication port parameters to match those of the control computer Note When changing these settings care must be taken to avoid losing Note communication with the instrument If this should happen the default communications settings can be restored those operational at the time of shipment by moving
12. hange I Identity This command requests the unit to send items of data which describe the unit identity Command I Reply type range S N cal date Result No change in status or operation Where Type Equipment model Druck RPT 301 Range Pressure range lower and upper and pressure type S N Transducer serial number Cal date Date of last calibration Command 1 S PIN Name Value lt CR gt format i When Name S Value nnnn yy mm Reply S N nnn yy mm Result sets displayed serial number ii When Name Value nnnn Reply HIGH RANGE nnn mbar Result sets displayed highest operating pressure mbar iii When Name L Value nnnn Reply LOWEST RANGE nnn mbar Result sets displayed lowest operating pressure mbar K177 Issue No 3 301 User Manual 23 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 controlled environment by qualified personnel If the accuracy of the instrumentis not within the specification carry out a calibration adjustment procedure A qualified person must have attended a product training course given by the manufacturer or appointed agent and successfully completed the training course on this equipment
13. instrument Maintenance The instrument must be maintained using the manufacturer s procedures and should be carried out by authorised service agents or the manufacturer s Service departments Technical Advice For technical advice contact the manufacturer or subsidiary refer to section 55 A qualified technician must have the necessary technical knowledge documentation special test equipment and tools to carry out the required work on this instrument K177 Issue No 3 301 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 kilogram per centimetre squared kPa kilo Pascal mA milli Ampere mm milli metre NL H amp R non linearity hysteresis and repeatability PCB printed circuit board psi pound per square inch RPT resonant pressure transducer V Volt VA Volt amp The following symbols are used in this manual This symbol on the instrument or in the manual indicates a Hazard a warning highlighting a danger that would result in injury Also a marking on the instrument referring the user to this publication A static sensitive component the relevant EEC directives Further details of applied stand This product meets the essential protection requirements of CE ards may be found in the product
14. lt causes an error message to be sent Serious faults block the transmission of pressure data and sends the error message in place of data K177 Issue No 3 16 301 User Manual 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 when an error is detected Example When first detected the hardware fault error is sent once even though the fault persists sending the S status command provides further details of the fault K177 Issue No 3 301 User Manual 17 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 lt SP gt UNITS Where nnnnnnn is the stored reading as a floating point number Units are the units for nnnnnnn i e mbar mH O psi etc G Get reading This command initiates a new measuring cycle The reading is not returned by this command string G and R together to return the reading i e G R lt CR gt The instrument proceeds to the next command after the end of the measurement cycle see specification for du
15. ndshaking on the RS485 interface Changing the communication interface standard Figure 2 3 o The communication interface standard is set at manufacture to RS232 but can be changed as follows o Remove the lid of the instrument to gain access to the PCB CAUTION THE PCB CONTAINS SENSITIVE ELECTRONIC COMPONENTS o Carefully connect the interface connector lead and the link LK2 in the following positions RS232 interface lead to PL1 RS485 LK2 to position A interface lead to PL3 LK2 to position B o Refit and secure the lid of the instrument K177 Issue No 3 301 User Manual 9 LK1 LK2 B A Figure 2 3 Changing the communication interface K177 Issue No 3 10 301 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 27 enclosure connect screen to connector shell Screening to ensure EMC performance K177 Issue No 3 301 User Manual 11 3 3 1 3 2 Operation System Operation The frequency output from the sensor is counted for a fixed number of cycles mid scale pressure gives 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 valu
16. nt readings using a statistical best straight line method For single point calibration the gain factor is set to unity Notes 1 For the pressure sensor to rapidly respond to the applied pressure disable the filter by sending the filter command F 0 0 lt CR gt 2 Before sending the C command set the instrument to operate in the pressure measurement units required for calibration i e U O CR selects mbar Always use the same units when entering applied pressures Command C PIN Reply APPLY PRESSURE nn apply pressure when steady send CT Reply ENTER APPLIED PRESSURE nn type pressure value decimal number followed by CT Reply MORE Y N type Y CT to calibrate more points or type N CT to complete calibration point entry Reply f N SLOPE XX INTERSECT YY ACCEPT CALIBRATION Y N type Y CT to accept and permanently update the calibration or type N lt CT gt to terminate without saving Reply if N CALIBRATION TERMINATED end of calibration procedure Reply if Y ENTER CAL DATE type date in the format DD MM YY Reply CALIBRATION COMPLETE Where nn pressure point 1 6 K177 Issue No 3 301 User Manual 25 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
17. ration or in the event of a reading failure fault condition after a time out of approximately 2 seconds The command synchronises the measurement cycle with an external event Note Use of the G command overrides any filter that has been selected The reading obtained is passed without filtering to the reading store Command G Reply None Result Initiates new measurement cycle A Auto send reading This command places the instrument into a mode where the value currently held in the reading store is sent to the control computer with a specified interval between each transmission Auto sendis terminated by any following command K177 Issue No 3 18 301 User Manual 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 formatis the same as the reply of the R command X Auto Send from switch on The A command is cancelled by any following commands and is not restored at switch on If the pressure transducer continuously sends readings and does so even after power failure this includes using the shutdown facility then the X command can be used to select this facility This command allows a transmission period to be stored in nonvolatile memory which will be automatically loaded and actioned as if the A command had been sent at switch on
18. rcuits and the serial data link The isolation voltage is 50V For continuous operation the Start up connections should be connected to the supply make sure the polarity is correct and the current requirements are met When RS232 is used the RTS line can be connected to the Start up input and the RTS input on pin D so that the control computer can turn on the instrument K177 Issue No 3 301 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 greater than 5 V a series resistor can be used to reduce the current drain to 1 mA power supply B oA RPT 301 logic ek control signal Connections for remote on off control e power supply current limiting resistor Pa for high supply voltages see text RPT 301 Connections for continuous operation eB power Supply 5 oA o p RPT 301 RS232 eK control computer eJ connector Connections for remote on off control using RS232 output K177 Issue No 3 8 301 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 ha
19. sensing RPT 301 Digital Output Pressure Transducer User Manual K177 General Electric Company All rights reserved 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 way to third parties nor stored in any Data Processing System without the express written authority of Druck Limited K177 Issue No 3 K177 Issue No 3 301 User Manual Safety o 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 o This manual contains operating and safety instructions that must be followed for safe operation and to maintain the instrument in a safe condition The safety instructions are either warnings or cautions issued to protect the user and the equipment from injury or damage Use qualified technicians and good engineering practice for all procedures in this manual Pressure Do not apply pressure greater the maximum safe working pressure to the instrument Electrical Safety This instrument is designed to be safe when using options and accessories supplied by the manufacturer Toxic Materials There are no known toxic materials used in this
20. st be sent with this type of command All command fields must be separated by a comma The instrument accepts upper case or lower case letters Single commands Single commands should be of the form Command P1 P2 Pn lt CT gt Where Command is a single ASCII character P1 to Pn are numbers in the form mmm ddd 2m ddddE Jxx e g 123 456 or 1 23456E02 Example Single Command CT is the command terminator CR or CRLF A 3 lt CR gt selects auto send mode with 3 second period a 3 CRLF has the same effect Command Strings Commands can be strung together with a separating semicolon The whole command string is only interpreted and actioned when a valid terminator is received Example Multiple Commands Command String 15 PIN address baud data bits stop bits parity handshake units P PIN New PIN Reply None This command string sets port address 00 baud rate units and new PIN K177 Issue No 3 14 301 User Manual 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 consecutive readings and then selects auto send mode with a period of 100 seconds between readings Command String Limitations Auto send mode and diagnostics
21. strument 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 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 filter or restrictor is recommended K177 Issue No 3 301 User Manual 113 mm 4 45 in 52 mm 2 05 in Figure 2 2 Instrument Dimensions K177 Issue No 3 6 301 User Manual 2 3 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 A E Power Supply ve A Power Supply ve B Power Supply ve B Power Supply ve Chassis Chassis D Data out ve D RTS Input Data out ve Data Out F Data In ve F CTS Output G Data In ve G Data In H Data Ground H Data Ground J Start Up ve J Start Up ve K Start Up ve K Start Up ve Power supply Theinstrumentis internally fused with reverse polarity and overvoltage protection Note The power input is transformer isolated from the logic ci
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