DPI 740 User Manual - GE Measurement & Control
Contents
1. 6 Use F1 to increase the datum value and F2 to decrease the datum value Note Pressing and holding either F1 or F2 changes the value at a fast rate Pressing and holding MODE and either F1 or F2 accelerates this fast rate 7 When the datum value is correct press SET the display returns to altitude measurement corrected using the new pressure datum Note Pressing the MODE push button steps menu back one setting allowing a value to be corrected K0200 Issue No 1 18 DPI 740 User Manual Processing Measurements Figure 3 6 The instrument can process the measurement results in the following ways eo Tare Filter e Max min Tare Each measurement can be individually tared The tare function substracts the presently measured value from all subsequent measurements When the tare function is enabled the display flashes the tare symbol To enable and disable the tare function proceed as follows 1 Press the MODE push button to select the measurement to be tared Press F1 to enter the instrument menu Press F1 to view the process options Press F1 again to view the tare options we jd PM Press F1 to enable tare or F2 to disable tare Filter When switched on the low pass filter is applied to all measurements in all three measurement modes Before switching on the two parameters of BAND and TIME should be set Note When the time constant in the sample is large and the filter is active at power up2. FA Enable disable addressed mode FA lt flag gt Format addressing mode command Enables disables the addressed mode feature of the data transactions When addressed mode is disabled one to one communication direct mode is assumed lt flag gt 0 disable addressed mode 1 enable addressed mode FA 0 disable addressed mode FA 1 enable addressed mode Query There is no corresponding query command K0200 Issue No 1 DPI 740 User Manual 59 Key commands Command KM Local remote operating mode Format KM lt flag gt Description Sets the push button mode so that the instrument can be operated remotely This command locks unlocks the push buttons Example KM L local mode push buttons enabled KM 2 remote mode push buttons disabled Query The query command returns the local remote status KM query operating mode Reply KM L operating in local mode or KM R operating in remote mode K0200 Issue No 1 60 DPI 740 User Manual Table 6 1 Table of Error Definitions The 16 bit hexadecimal mask defined below can be specified using the AE command Itis used for automatic error reporting by the RE message transmitted by the instrument Bit Error Description D syntax error Set if the command syntax was not understood 1 parameter error Set if the parameters in the command were out of range or not valid 2 configuration The configuration parameters can only be changed error if the configuration PIN i
3. O Exit set up display returns to pressure measurement Figure 3 10 Calibration K0200 Issue No 1 36 DPI 740 User Manual Two point calibration Proceed as follows 1 Make sure the instrument is in measurement mode and displaying pressure the display shows CAL on the status line ect the CAL menu Use F1 F2 and SET to enter the PIN ect a two point calibration the display prompts for the first calibration point 2 Press SET unti 3 PressFltose 4 5 Press F2 tose 6 7 Use F1 T and Adjust the pressure standard for the first calibration point F2 J to set the first calibration value 8 When the pressure is stable press SET to enter the first calibration po calibration poi int The display prompts for the second nt 9 Repeat steps 5 to 7 for the second calibration point 10 Press F1 to accept the calibration values the display prompts for the calibration date 11 Use F1 T and F2 J to set the calibration date K0200 Issue No 1 DPI 740 User Manual 37 5 Maintenance 5 1 General User maintenance on this unit is limited to battery replacement fault finding and cleaning 5 2 Fault finding Displayed error messages If the pressure sensed by the instrument exceeds 110 of the full scale pressure value the display flashes the message OVERRANGE ERROR Reduce the applied pressure until the error message goes out If the calibration or set up of the t
4. Process sub mMenu ax Min menu Set up menu Communications set up Calibration page page vi K200 Issue No 1 DPI 740 User Manual 1 1 Introduction The Druck DPI 740 precision pressure indicator uses a silicon resonant pressure transducer producing a pressure reading in units of pressure measurement and altitude The instrument is contained in a moulded enclosure of a composite ABS material and can be used as a hand held indicator or using a retractable stand as a bench instrument The instrument can also communicate through a serial RS232 connector with a compatible computer system or printer WANN ml MT eme Figure 1 1 General view K0200 Issue No 1 2 DPI 740 User Manual 1 1 Specification Dimensions Weight nominal 0 5 kg Size height 190 mm width 90 mm depth 36 mm Environmental Temperature Operating 10 to 50 T Storage 40 to 70 T Pressure medium Any gas compatible with pyrex silicon stainless steel and epoxy resin Sealing standards Ee IP54 Pressure 6mm old 4 mm i d hose fitting Accuracy Non linearity hysteresis and repeatability over the range of 10 to 30 C Gebees ann FOOL WES over the range of 0 to 40 C E OO VON over the range of 10 to 50 C La 0 045 FS Stability lt 100 ppm year RGEMGEADGONNEET Ejsing 750 to 1150 mbar a alterna
5. Table 6 3 Example Program in QBASIC start EOFch 26 CLS port 1 PRINT SPC 20 DPI 740 Druck Iniversal Communications nterface Example Program PRINT SPC 19 PRINT T Before commencing ensure that the DPI 740 Communications rameters are set as follows DU D VU 2 2 2 Q T Baudrate 9600 Parity None Handshaking None Databits Stopbits 1 NT The PC serial comms port used is COM T port 2 2 D D DU DU D DU DU NT Please note DOS File Name Pressure Readings will be Logged is File S25 KEEN T Nm D 2 2 T Ready PRINT Press lt CTRL gt lt BREAK gt to exit RINT Starting communications OPEN Nm FOR OUTPUT AS 2 F port 2 THEN OPEN COM2 9600 N 8 1 RS RB6000 FOR RANDOM AS 1 U m LSE OPEN COM2 9600 N 8 1 RS RB6000 FOR RANDOM AS 1 ND IF RINT Comm port opened OK RINT 1 sa CHR 13 RINT 2 sa CHR 13 CHR 10 GOSUB GetReply address RIGHT a 4 address LEFT address 2 000 vm a K0200 Issue No 1 DPI 740 User Manual 63 oO wn a NT NT SU NT NT NT NT SU SS ess ODAADDBDOAADDA 3 7 oO NT NT N NT 22222 NT OSU MONO UvU sen fe DU DU DU en U U UT OU GG U DU DU DU DU DU DU DU DU D ND O oO NT 1 address 99 T 1 fa 1 CHR 13 NT 2 fa 1 CHR 13 CHR 10 NT 1 address 99 ic p CHR 13
6. query instrument address reply address is 00 put instrument in addressed mode send command to instrument 00 from instrument 99 input channel is pressure set up process channel to filter input reading ir time constant 10 band 1 units to mbar get reading from process channel reply of pressure in mbar filtered reading get unfiltered reading reply of pressure in mbar units to inHg get reading from process channel filtered pressure reading in inHg take QFF addressed query units units 18 inHg see table 6 1 This example is reproduced using QBASIC in Table 6 3 K0200 Issue No 1 DPI 740 User Manual 43 6 3 Command Summary The following functions can be performed using the serial link Input Commands IC lt param type gt Set up input IR Get input reading IU lt index gt Set up input units IA k Enable automatic sending of input reading Process Commands PC lt process definition gt Set up Process PC IR lt value gt lt value gt filter PC T IR tare PC T IR lt value gt PC lt IR maximum PC gt IR minimum PC QIIR lt value gt lt value gt QFF PC A IR lt value gt altitude PR Get process reading PA k Enable automatic sending of process reading PM Reset process maximum and minimum values Instrument Set up Commands SA lt nn gt Set instrument address SUn lt units index gt Set up regular units Calibration Commands CT lt cal type gt Specify calib
7. BS British standard cmHg centimetre of mercury CTS clear to send DC direct current DCE data circuit terminating equipment DTE data terminal equipment DUCI Druck Universal Communication Interface tH 0 eet of water FS ull scale hPa hecto Pascal Hz Hertz CAO nternational Civil Aviation Organisation i d inside diameter inHg inch of mercury inH 0 _ inch of water SA nternational standard atmosphere ilogram gf cm kilogram forceper square centimetre gf m2 kilogram forceper square metre Pa ilo Pascal bf ft2 pound force per square foot LCD iquid crystal display mA milli Ampere mbar millibar mbara millibar absolute mm millimetre mmHg millimetre of mercury mHg metre of mercury MPa mega Pascal mV millivolt K200 Issue No 1 DPI 740 User Manual iv Abbreviations continued NiCad nickel cadmium o d outside diameter Pa Pascal PCB printed circuit board ppm parts per million psi pound per square inch QFE barometric pressure at airfield level local QFF calculated sea level pressure including air temperature QNH calculated sea level pressure RPT resonant pressure transducer RTS ready to send RS232 Serial data communication standard Rx receive Tx transmit V Volt VA Volt amp K degrees Celsius SE degrees Fahrenheit Symbols The following symbols are used to identify hazards on this instrument Static sensitive components handle with extreme care Thissymbol onthe instrument
8. enough time must be allowed for the sample to be received and a stable reading to be displayed K0200 Issue No 1 DPI 740 User Manual 19 LVVar picsours QFE Lo PROCESS Change units MAX MIN MORE s MAX MIN s value units value units Figure 3 6 Process sub menu K0200 Issue No 1 20 DPI 740 User Manual Entering the Filter Parameters BAND of FS is the maximum percentage change in reading that can occur before the filter directly followsthe changing pressure This parameter can be set between 0 and 10 FS TIME is the time constant of the filter when a small step change in pressure is applied less than the band setting it is the time to reach approximately 63 of the final value The final value will be reached in five time constants Display returns to Exa m ple pressure measurement With the TIME set to 2 seconds the display shows the full pressure value after 10 seconds value 0 to 99 Proceed as follows 1 ake sure the instrument is in measurement mode and displaying pressure Press SET twice and status line shows MAX MIN FILTER Press F2 to select FILTER settings Use F1 4 and F2 T to set the BAND value Press SET when the display shows the required value em Fb a Repeat steps 4 and 5 to enter the TIME value Dressing SET returns the instrument to measurement mode with the new filter settings stored and ready for us
9. indicates that the user should refer to the user manual K200 Issue No 1 EES 1 2 21 22 23 ach 32 3 3 91 5 2 53 DPI 740 User Manual Table of Contents title Introduction Specification Accessories and Options INSTANS dei singes der eurent Battery Electrical Connections Initial Settings saannin CH Operation General Measurement Modes Local QFE Measurement Sea Level QFF Measurement Altitude Measurement Processing Measurements Filter Max Min Set up Menu Ba Uni Serial Communications Entering a new PIN Sending Measurements to a Printer or PC Calibration Calibration Chec alen nn ER A nE 37 General Fault finding CLS ll K200 Issue No 1 DPI 740 User Manual 6 1 6 2 6 3 6 4 Table of Contents contd title Communications ntroduction General Command Format nput Commands Process Command Set up Commands Calibration Commands Automatic Commands Read Commands Protocol Format Commands ey Commands cee Approved Service Agents fig 1 1 2 1 2 2 2 3 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3 9 3 10 Table of Illustrations title General view Fitting the batter Electrical connections Adaptor charger connector nstrument front panel easurement mode menu Local pressure measurement Sea level measurement we Altitude measurement
10. Automatic addressing Format AA lt device address gt Description This command can only be used with the command header block It automatically sets the addresses of the instruments in the network to sequentially increasing addresses Example AA 10 With three instruments in the network this command sets the instrument addresses 10 11 and 12 Query There is no query for this command Command AE Automatic error reporting Format AE lt error mask gt Description This command enables error reporting A 16 bit hexadecimal value lt error mask gt defines the bit image of errors to be acted on if set If the error occurs the RE error message is automatically lt error mask gt is defined in Table 6 1 Note An automatic error response does not clear the error bit The RE command must be issued to clear the error Example AE 0001 an error is reported when a syntax error is generated AE FEEF an error is reported for every error Query A query responds with a hexadecimal value corresponding to the bit image of the error mask K0200 Issue No 1 56 DPI 740 User Manual Read commands Command Format Description Example Query Command Format Description Example RB Read Battery Volts RB Read battery voltage RB query battery voltage Reply RB lt voltage gt RB 3 9 battery 3 9 volts There is a query only command RI Read instrument type and version number
11. DPI 740 User Manual 31 Entering a new PIN The instrument calibration is protected by a PIN which must be entered before accessing the calibration menu The default PIN set at manufacture is 000 Changing the PIN Proceed as follows 1 Make sure the instrument is in measurement mode and displaying pressure Press SET until the display shows PIN on the status line Press F2 to change the PIN Using F1 T F2 4 and SET to enter the current PIN Using F1 T F2 J and SET to enter the new PIN Using F1 T F2 4 and SET to enter the new PIN again The instrument compares the first new PIN with the second new PIN to verify the entry 7 If verified successfully the display briefly shows New PIN Accepted on the status line anrwn Note lf not verified the display briefly shows Verify Failure on he status line K0200 Issue No 1 32 DPI 740 User Manual Sending Measurements to a Printer or PC The measured pressure or altitude can be sent to a printer or PC through the RS232 communications connector The instrument sends the current selected measurement mode data Sending Data Proceed as follows 1 Set the RS232 communications parameters of the instrument to match the device receiving the data 2 Press SET until the display shows PRINT on the status line 3 Press F1 to select the PRINT menu The display shows the flashing message Ent Print Period This is the rate at which measurements are transmitted by the
12. RI Read device equipment this returns the instrumenttype on the network including the version of the code in the form RI lt string gt where the string is in the format DPInnn Vm mm nnn instrument type m mm version and issue number RI query instrument version and issue number RI DPI740 V1 10 Query There is a query only command K0200 Issue No 1 DPI 740 User Manual 57 Command RE Read error status Format RE Description Report errors This query command reports any error since the last RE command The errors are stored as bits 16 bits max and set if the error occurred After issuing this command all errors are cleared The error codes are defined in Table 6 1 Note Errors are only set for commands sent to the instrument All other commands are ignored where the string is in the format Example RE reports errors RE 0000 no errors since last report Query There is a query only command K0200 Issue No 1 58 DPI 740 User Manual Protocol format commands Command Format Description Example Query Command Format Description Example FC Enable disable message checksum FC lt flag gt Format checksum command Enables disables the checksum feature of the data transactions lt flag gt 0 disable checksum feature 1 enable checksum feature FC 0 disable checksum feature FC 1 enable checksum feature There is no corresponding query command
13. push button is pressed for the third unit The indicator then returns to the pressure measurement mode with the three new units stored and available on push button F2 Note 2 Pressing the MODE push button steps the menu back one setting allowing reselection of the unit Units of Altitude Measurement When the indicator is in altitude measurement mode pressing F2 changes the units of height measurement between feet and metres These two units are held in nonvolatile memory K0200 Issue No 1 28 DPI 740 User Manual Time out The time out period can be set between 1 and 15 minutes default 1 minute In the enabled state if no push buttons have been pressed the time out switches the instrument off after the time elapsed Pressing the ON OFF push button on resets the time out and switches the instrument back on When this function is disabled the instrument can only be switched off by the ON OFF push button Notes 1 The time out function is disabled in calibration mode 2 When switching the instrument on the time out can be disabled by pressing MODE and on off push button together Adjusting the Time out Period Proceed as follows 1 Make sure the instrument is in measurement mode and displaying pressure 2 Press SET until the status line shows TIME_OUT 3 Press F1 to select time out settings 4 Use F1 T and F2 J to adjust to the required time out period 5 Press SET 6 Press F1 to enable ON the ti
14. to press F2 to change PROCESS and SET_QFF menu between three units Figure 3 4 Sea level measurement K0200 Issue No 1 DPI 740 User Manual 15 Entering Local Height and Temperature Data for Sea Level Pressure Measurements The indicator stores the local height and temperature data used in the sea level pressure measurement in nonvolatile memory To enter this data proceed as follows 1 Press the MODE push button to select sea level pressure measurement mode confirmed by the display showing Sea on the status line 2 Press F1 to show the measurement menu 3 Press F2 selecting the SET OFF parameter confirmed by he display flashing Enter Height ASL 4 Press either F1 F2 or SET to allow the height to be entered the display stops flashing 5 Use F1 to increase the height value and F2 to decrease he height value Note Pressing and holding either F1 or F2 changes the value at a fast rate Pressing and holding MODE and either F1 or F2 accelerates this fast rate 6 When the height is correct press SET the display changes o flash Enter Temp 7 Repeat steps 4 5 and 6 to enter the temperature value The display returns to sea level pressure measurement corrected using the new height and temperature data Note Pressing the MODE push button steps menu back one setting allowing a value to be corrected K0200 Issue No 1 16 DPI 740 User Manual Altitude Measurement Figure 3 5 This mode measu
15. GE Sensing Druck DPI 740 Precision Pressure Indicator User Manual K0200 The General Electric Company All rights reserved i DPI 740 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 o This publication 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 o Use qualified personnel and good engineering practice for all procedures in this publication Pressure Donotapply pressure greater than the maximum safe working pressure to the instrument Toxic Materials There are no known toxic materials used in this 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 agent or subsidiary refer to the list at the rear of this manual A qualified technician must have the necessary technical knowledge documentation special test equipment and tools to carry out the required work on this equipment This product meets the essential protection C requirements
16. able For RS232 connecting the 6 pin LEMO to standard 9 way D type D Transit case K0200 Issue No 1 DPI 740 User Manual 5 2 Installation WARNING DO NOT ATTEMPT TO CHARGE NON RECHARGEABLE BATTERIES TO PREVENT ACCIDENTAL CHARGING OF NON RECHARGEABLE BATTERIES THE CHARGE LINK LK2 MUST BE IN THE DISABLED POSITION kel CAUTION DO NOT LEAVE DISCHARGED BATTERIES IN THE INSTRUMENT OLD BATTERIES CAN LEAK AND CAUSE CORROSION WHEN FITTING THE BATTERIES MAKE SURE THE ELECTRICAL CONTACTS ARE CLEAN AND OBSERVE THE CORRECT POLARITY Note For further information refer to the safety page at the front of this manual and to the battery manufacturer 2 1 Battery Figure 2 1 Three batteries are fitted in the battery compartment For non rechargeable batteries make sure the charging link LK2 is fitted in the disabled position X For rechargeable batteries make sure the charging link LK2 is fitted in the enabled position kel Note The charging link LK2 is located on the instrument PCB To access this link remove the top case assembly To replace the batteries unscrew the captive screw and slide off the battery compartment cover Make sure the polarity of the new batteries is correct If the battery capacity is low the display shows o The battery symbol approximately 1 hour left The flashing message Battery Very Low for 15 to 20 minutes o The message Batteries Dead followed after a short time Switching Of
17. address 99 ic p CHR 13 CHR 10 address 99 pc ir 10 1 CHR 13 address 99 pc ir 10 1 CHR 13 CHR 10 address 99 iu 0 CHR 13 address 99 iu 0 CHR 13 CHR 10 E E WW E E address 99 pr CHR 13 7 2 address 99 pr CHR 13 CHR 10 B GetReply ure RIGHT a 10 ure LEFT pressure 8 Pressure of the Day is pressure mbar CHR 13 CHR 13 2 address 99 ir CHR 13 CHR 10 B GetReply 1 address 99 iu 18 CHR 13 2 address 99 iu 18 CHR 13 CHR 10 1 address 99 pr CHR 13 2 address 99 pr CHR 13 CHR 10 B GetReply ure RIGHT a 10 ure LEFT pressure 8 Pressure of the Day is pressure inHg CHR 13 1 address 99 fa 0 CHR 13 T 2 address 99 fa 0 CHR 13 CHR 10 1 iu CHR 13 2 iu CHR 13 CHR 10 B GetReply LOSE 1 OSE 2 Reply a DO b INPUT 1 1 a a b LOOP UNTIL b CHR 10 PRINT 2 a RETURN K0200 Issue No 1 64 DPI 740 User Manual Approved Service Agents www gesensing com K0200 Issue No 1
18. anual 49 Command Format Description Query Example Command Format Description Example Query Example PA Command Format Description PR Get reading PR Requests the reading This is a query only command OR Reply OR 1000 00 reading in mbar PA Enable automatic sending of reading PA k Enables automatic sending of input reading The value k corresponds to send every kth conversion If kis 0 the automatic send feature is disabled PA 10 send value every 10th conversion PA 0 disable the automatic feature A query responds with an integer of the automatic send interval in conversions Reply PA 10 PM Resets process maximum and minimum values also see PC command lt lt and gt 1 PM Sets maximum and minimum values equal tothecurrentreading ineffectresetting both values Query There is no corresponding query command K0200 Issue No 1 50 DPI 740 User Manual Set up commands Command Format Description Example Query Command Format Description Example Query SU1 0 SA Set instrument address SA lt nn gt Setinstrumentaddressto lt nn gt Changesthe network address of the instrument in the range 0 to 98 Address 99 is used for global commands SA 10 set instrument address to 10 SA query instrument address Reply SA 10 SU Set up regular units SUn lt units index gt Selects the pressure units that appear as default s
19. arry out a one point calibration Carry out a two point calibration PIN enter new PIN number PRINT enter print period Figure 3 8 Set up Menu K0200 Issue No 1 26 DPI 740 User Manual Battery gt This sub menu shows the capacity charge compared to the full charge capacity sub menu shown as a percentage in 25 bands DEE Un UNITS BATTS example Battery75 100 ON Units When in the local or sea level measurement modes pressing F2 changes the units of pressure measurement between three preselected units held in nonvolatile memory When shipped the instrument s units of pressure measurement are mbar inHg and hPa These units of pressure measurement can be change to any from the following list 0 mbar 12 cmH 0 1 bar 13 mH 0 2 Pa 14 orr 3 hPa 15 atm 4 kPa 16 psi 5 MPa 17 In 6 kgf cm 18 inHg 7 kgf m 19 inH 020 20 LC 8 mmHg 20 inH 004 41C 9 cmHg 21 ftH 020 200 10 mHg 22 ftHz004 4JC 11 mmH 0 23 inH 060 60 F K0200 Issue No 1 DPI 740 User Manual 27 Changing the preselected units of pressure Proceed as follows 1 Press the SET push button Press F2 to select UNITS Use F1 and F2 move up and down the list of units Press the SET push button to select the required unit Repeat steps 3 and 4 to select the second and third units mn P UN D Note 1 The storing of the new units takes place when the SET
20. e Note The filter parameters are nonvolatile and remain stored with the instrument switched off K0200 Issue No 1 DPI 740 User Manual 21 Switching the Filter ON or OFF To switch the filter on proceed as follows 1 Make sure the instrument is in measurement mode and displaying pressure 2 Press F1 to enter the instrument menu 3 Press F1 to enter view process options 4 Press F2 to view the next option FILTER 5 Press F1 to view the filter options 6 Press F1 to switch filter on or F2 to switch filter off Note When the filter is switched on the display shows the SS symbol MAX MIN In normal measurement mode the max min measurements are recorded as a background task The store is reset when the instrument is switched on or can be reset at any time Resetting the Maximum Minimum Store Proceed as follows 1 Make sure the instrument is in measurement mode and displaying pressure or altitude 2 Press SET twice status line shows MAX MIN FILTER 3 Press F1 to select the MAX MIN sub menu 4 Press F1 to reset the MAX MIN store and return the instrument to measurement mode K0200 Issue No 1 22 DPI 740 User Manual y MAX MIN MORE A max value units return to pressure measurement mode Figure 3 7 MAX MIN menu K0200 Issue No 1 DPI 740 User Manual 23 Viewing the Maximum and Minimum Proceed as follows 1 Make sure the instrument is in measurement mode and displayin
21. einsseld 290 9 g aunby aas SS390 d to 7 340 2 Measurement mode menu Figure 3 K0200 Issue No 1 DPI 740 User Manual 13 Local QFE Measurement Figure 3 3 This is the direct measurement of the absolute pressure sensed at the pressure port In addition to measuring local pressure the instrument can with the use of a hose and connection measure absolute pressure at a system test point M1 177 en LUUT QD Re LOCAL mbar measurement mode units of measurement pressing F1 enters press F2 to change PROCESS menu between three units Figure 3 3 Local pressure measurement K0200 Issue No 1 14 DPI 740 User Manual Sea Level QFF Measurement Figure 3 4 This mode measures the sea level pressure It is the meteorological presentation QFF of barometric pressure at mean sea level and is a calculated value based on the local height above sea level and the local air temperature Note QNH is a derivative of QFF without a correction for local air temperature Setting local height and temperature data These correction factors are entered for a particular site and remain stored in nonvolatile memory to correct the pressure value when Sea QFF is selected The two correction factors are mean height above sea level in metres or feet units selected in altitude mode and the local air temperature in C MT 111 LJ LULU st measurement mode units of measurement pressing F1 steps
22. election F2 in measurement mode Both required parameters must be specified i e the push button sequence n 1 2 or 3 and he lt units index gt SU1 0 sets first units 1 to mbar SU2 18 sets second units 2 to inHg The corresponding query command returns he index to the pressure units selected for he specified option SU1 Reply SUn lt units index gt K0200 Issue No 1 DPI 740 User Manual 51 Calibration commands C User Calibration This command allows the user to perform a two point calibration on the output of the device The calibration routine requires two pressures to be applied within the operating extremes The software calculates an offset and gain correction to all subsequent readings Command CT Specify calibration type Format CT lt cal type gt Description Specify the type of calibration to be performed The instrument must be in calibration mode before this command becomes valid lt cal type gt 1 two point matching calibration Example CT 1 perform two point matching calibration Query A query of this parameter CT returns the type of calibration in progress CT query calibration type Reply CT 1 The instrument is now ready for the application of calibration pressure both the calibration points must be entered to complete the procedure When the pressure stabilizes the instrument must be sent the applied value in the currently selected units using the CP command K0200 Iss
23. essage Pressing the MODE push button steps through the three pressure measurement modes Pressing the SET push button steps through the set up menu described in 3 3 3 2 Measurement Modes Figure 3 1 Selecting the MODE push button changes the measurement mode between Local QFE unprocessed pressure at the pressure port Sea QFF calculated pressure at sea level Altitude calculated height from pressure datum Selecting the push button F2 changes the units of pressure measurement continuous pressing steps between three preselected units the display shows the units for each meas urement mode low pass filter tare A i ZO Oooo NN NN AA es Jol battery ares LOERL mbar a selected selected 16 character units mode tatus li SR function function selection selection DMa menus mode selection ON OFF control Figure 3 1 Instrument front panel K0200 Issue No 1 DPI 740 User Manual 12 FYNLVIFdNIL AYOLS WNLVd FYUNSSIYd FYOLS equ cz eLoL ay 9 lt A gt dW31 due 1eju3 LHOIFH 3401S A lt wnjeg au Hequ Gz LOL Jed winjeg ainsseld Of HFSN JE YSI t SS se wes TSY JUBIeH 4944 el fe Liv Las SOU JO JOO spun eBueyd 00 Ot ol TT lh VAS seJjew pue jeet U epn ly ainssaJd 818 Bas MNsegou do yo LH J40 se ewes 440 LFS SSI90Yd syun obuey f rh 1V90 440
24. f the instrument then automatically switches off K0200 Issue No 1 6 DPI 740 User Manual Figure 2 1 Fitting the Battery 2 2 Electrical connections Figure 2 2 and 2 3 The optional adaptor charger is supplied with a set of interchangeable connectors so that the unit can be used worldwide Tochangethe power pinadaptor pushthe adaptor from the charger body align the replacement adaptor and push onto the charger body Battery charger This is a two pole 2 5 mm centre pin connector ve centre pin ve outer connector casing K0200 Issue No 1 DPI 740 User Manual RS232 connections Option C is the adaptor cable recommended for use with the RS232 serial communication interface The adaptor cable has at one end 6 pin LEMO type connector and at the other a 9 way Dtypeconnector The instrument s serial communication settings and the data terminal equipment DTE settings must bethe same The recommended initial settings are as follows Baud rate 9600 Data bits 8 Stop bits 1 Parity none Handshaking none Adaptor Cable Instrument DCE PC DTE LEMO connector D type Connector 9 way 25 way Pin No Function Flow Function Pin No Pin No i RxD input TxD 3 2 2 CTS input RTS 7 4 3 GND screen GND 5 7 4 not used 5 RTS output cTs 8 5 6 TxD output RxD 2 3 Notes 1 The function column for the D type connector uses RS232 terminology w
25. g pressure 2 Press F1 to enter the instrument menu 3 Press F1 to view process options 4 Press F2 until the status line shows MAX MIN 5 Press F1 to view max min options 6 Select MAX F1 or MIN F2 the status line shows the recorded value 7 Press F1 then F2 to switch off either the maximum or minimum value Press F1 twice to view the other maximum or minimum value Note The Max Min options must be reselected after changing to another measurement mode K0200 Issue No 1 24 DPI 740 User Manual intentionally left blank K0200 Issue No 1 DPI 740 User Manual 25 3 3 Set up Menu Figure 3 8 To change other less used facilities and background tasks enter the set up menu by pressing the SET push button Pressing SET again steps to the next sub menu set In each sub menu the function push buttons F1 and F2 are used to select the required task Note Using the MODE push button 4 Instrument enters set up menu steps back one menu selection BATTERY battery capacity Configure units of UNITS pressure measurement MAX MIN 7 MAXMIN function L reset MAX MIN store see processing FILTER FILTER function measurements L set filter window TIME OUT F configure TIME OUT E set time out period time in minutes enable disable time out COMMS configure RS232 L Set baud rate data bits stop bits parity and handshaking VC CAL perform CALIBRATION E C
26. instrument A Use F1 F2 and SET to enter the print period Pressing SET returns the instrument to measurement mode with the instrument transmitting data at the selected rate Error Message When an error is detected an error message is sent in the following form ERRORnn where nn is a decimal number Error numbers are 04 Bad data detected by checksum 16 Hardware fault 32 Pressure outside range K0200 Issue No 1 DPI 740 User Manual 33 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 recommended equipment for calibration is a compensated deadweight pressure standard or similar equipment to provide the required accuracy The following procedures should be carried out in a controlled environment by qualified instrument calibration personnel If the accuracy of the instrument is not within the specification carry out a calibration adjustment procedure w Themanufacturer offersacomprehensive and if required NAMAS accredited calibration service e Calibration Check A 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 instrumen
27. ith respect to DTE 2 Inthe D type connector DTR and DSR should be connected together as follows 9 way 25 way pin 4 and 6 pin 20 and 6 3 The instrument s serial communication settings can be changed using the set up menu K0200 Issue No 1 8 DPI 740 User Manual Figure 2 2 Electrical connections K0200 Issue No 1 DPI 740 User Manual 9 Figure 2 3 Adaptor charger connector K0200 Issue No 1 10 DPI 740 User Manual 2 3 Initial Settings The instrument is shipped with the following settings Standard Instrument Settings Units of pressure measurement selected by F2 mbar inHg hPa Battery charging link LK2 disabled X Calibration link LK1 disabled X PIN 000 enabled 1 minute Option B Instrument Settings Units of pressure measurement selected by F2 Battery charging link LK2 Calibration link LK1 Time out enabled 1 minute mbar inHg hPa enabled ke disabled X K0200 Issue No 1 DPI 740 User Manual 11 3 Operation 3 1 General Figure 3 1 The instrument is switched on by the ON OFF push button and powers up in the last selected mode and units of measurement The instrument times out after a period of one minute if no push button selections are made To keep the instrumentin the powered up state the ON OFF and MODE push buttons should be pressed together The display briefly shows a Timeout Disabled m
28. ition gt Set up Process PC IR lt value gt lt value gt filter PC T IR lt value gt tare PC lt IR maximum PC gt IR minimum PC Q IR lt value gt lt value gt QFF PC A IR lt value gt altitude PR Get process reading PA k Enable automatic sending of process reading PM Reset process maximum and minimum values Process definitions Example filter PC IR 0 15 0 01 Define filterinput reading changing the lt time constant gt and lt band gt Note This filter does not affect the normal instrument filter K0200 Issue No 1 48 DPI 740 User Manual Example T tare PC TIIR Full tare of input reading PC TIIR 100 00 Define tare of input reading subtracts 100 from reading The value specified in the command is in the currently selected units Note Thistaresthevalue but does not change the displayed value Example lt minimum PC lt IR Defines the minimum value of the input reading To reset this value use PM command Example gt maximum PC gt IR Defines the maximum value of the input reading To reset this value use PM command Example Q QFF PC Q IR 200 20 Define the derived QFF input value changing both the lt height gt and lt temp gt parameters Example A altitude also see command PA PC AIIR 120 00 Definethe derived ALTITUDE input value changingthe current or default setting of lt datum pressure gt to 120 00 K0200 Issue No 1 DPI 740 User M
29. me out function and press F2 to disable OFF the function Note The instrument stores the adjust time out period as the default value in nonvolatile memory K0200 Issue No 1 DPI 740 User Manual 29 Serial Communications Figure 3 9 The instrument uses RS232 communication parameters as follows Baud rate 19200 9600 4800 1200 600 300 amp 150 Data bits 7 8 Stop bits 1 2 Parity none even odd Handshaking none software hardware Notes I The parameters set on shipment are in bold 2 The instrument stores any adjusted communication setting in nonvolatile memory 3 To review the current settings select the sub menu and press the SET key to step through the sub menu 4 Pressing the MODE push button returns the instrument to the previous setting Setting the communication parameters Figure 3 9 Proceed as follows 1 Make sure the instrument is in measurement mode and displaying pressure 2 Press SET until the display shows COMMS on the status ine 3 Press F2 selecting the COMMS option A Use F1 and F2 to select the required baud rate and then press SET 5 Repeat step 4 to set the remaining parameters When all the parameters are entered the instrument uses the new settings immediately and returns to measurement mode K0200 Issue No 1 30 DPI 740 User Manual Exit set up display returns to pressure measurement Figure 3 9 Communications set up K0200 Issue No 1
30. nation characters the received destination address is checked for the global address 99 or against the instrument s address If this matches the command is interpreted or the command is ignored Commands can be stringed together in a data packet This allows a more efficient data transfer as the destination and source addresses do not have to be sent with each command example 0099IC PIU 0 lt CR gt lt LF gt The command separator can be used example 00991C P IU 0 lt CR gt lt LF gt This command sent by instrument 99 to instrument 00 to set up input channel to measure pressure and select pressure units of mbar Query facility In addition to sending commands to instruments data can be queried by adding the character to the command example 00991C lt CR gt lt LF gt This command interrogates instrument 00 for the parameter on input channel 1 Replies from the instruments follow a similar pattern except the start indicator is different Replies are echoed round the network and not interpreted Iddssxx lt CS gt lt terminator gt The following reply sent from instrument 00 to instrument 99 indicates that the input channel is measuring pressure 199001C P K0200 Issue No 1 42 example program sa ISA 00 fa 1 0099ic p 0099pc ir 10 1 0099iu 0 0099pr 19900PR1 987 22 0099ir I9900IR 987 22 0099iu 18 0099pr I9900PR1 29 153 0099fa 0 iu liu 18 DPI 740 User Manual
31. nvolatile memory The instrument returns to measurement mode There is no associated query command CX Calibration abort CX Aborts the calibration procedure IU 0 set up input as mbar PP 123 PIN entered put instrument into calibration mode CTs perform two point calibration CP 200 applied pressure 200 mbar CX abort calibration Query There is no associated query command K0200 Issue No 1 54 Command Format Description Example Query DPI 740 User Manual CD Calibration date CD lt dd mm yy gt Sets calibration date only valid in calibration mode CD 24 01 97 set cal date to 24 January 1997 CD query date of last calibration Reply CD 24 01 97 Example of a two point calibration IU 0 T 1 A D Cas ot KO SECH Command Format Description Example set up input as mbar PP 123 PIN entered put instrument into calibration mode perform two point calibration P 800 applied pressure 800 mbar P 1100 applied pressure 1100 mbar calibration accepted calibration date PP PIN protection PP lt pin gt This command is used to change the PIN of the instrument which is used to protect the calibration data and configuration lt pin gt 123 calibration PIN code PP 123 PIN entered put instrument into calibration mode Query There is no corresponding query command K0200 Issue No 1 DPI 740 User Manual 55 Automatic commands Command AA
32. of the relevant EEC directives Further details of applied standards may be found in the product specification K200 Issue No 1 DPI 740 User Manual ii Battery Safety This instrument is fitted with three size AA batteries either rechargeable nickel cadmium or non rechargeable alkaline Before storing this instrument remove the batteries When fitting batteries make sure the electrical contacts are clean and observe the correct polarity The battery compartment should be inspected for corrsion caused by leaking batteries Corrosion must be removed using approved methods When storing and transporting batteries make sure that they cannot be short circuited A short circuited battery can become very hot and can in certain circumstances explode Itis recommended that a suitable container is used for storing and transporting batteries Dispose of old batteries using a safe approved method Refer to the Battery Manufacturer for this information Software Version This manual contains operating instructions for instruments with software version 1 XX Further changes to the instrument s software may require a change to the operating instructions and an issue number change of the manual K200 Issue No 1 iii DPI 740 User Manual Abbreviations The following abbreviations are used in this manual Note Abbreviations are the same in the singular and plural ABS acrylonitrile butadiene styrene atm atmosphere
33. r lower case letters Commands should be in the form lt start gt ddssxx lt CS gt lt terminator gt where lt start gt is the start of a command block indicator that can be or character The character causes allcommand block data to be echoed around the network The character suppresses the echoing of the data block and can be used for commands such as AA automatic addressing dd is a two digit destination address 00 to 99 ss is a two digit source address 00 to 99 XX is a two character command This can be followed by additional data a number can be added to this command to select a channel lt CS gt _ is a block checksum and takes the form NN where N is a two digit checksum that is the modulo 100 sum of all the ASCII codes of the character in the string including the Note This checksum feature can be disabled so that the instrument does not use checksums in which case the checksum must not be sent When the checksum feature is enabled commands are only interpreted if the checksum is correct An error is reported if an incorrect checksum is received lt terminator gt is the string termination characters lt CR gt lt LF gt K0200 Issue No 1 DPI 740 User Manual 41 The address 99 is a global address recognised by all instruments As characters are received by the instrument they are instantly echoed on to the next instrument unless the command block character is a if On receiving the termi
34. ransducer or the instrument s operation becomes corrupted the display shows SYSTEM ERROR Return the instrument to the manufacturer or agent for repair 5 3 Cleaning Clean the case of the unit with a damp lint free cloth and mild detergent Make sure that there is no debris in the pressure port K0200 Issue No 1 38 DPI 740 User Manual K0200 Issue No 1 DPI 740 User Manual 39 6 Communications 6 1 Introduction The instrument can be used either in direct mode or as part of a network in the addressed mode The communications protocol used by the instrument is the Druck Universal Communication Interface DUCI In this section the commands that apply to the instrument are detailed and described for further information contact Druck Direct Mode One instrument can be connected directly to a control computer with no addressing is required Addressed Mode The instrument can be connected into a network of devices each device has a unique address 0 to 99 The network consistsofaringwiththetransmit line of one device connected to the receive line of the next device Hardware and software handshaking are not supported K0200 Issue No 1 40 DPI 740 User Manual 6 2 General Command Format The instrument is controlled by a sequence of letter codes some commands require numeric values to follow the letters The correct number of parameters must be sent for the particular command The instrument accepts upper case o
35. ration type CP lt value gt lt temperature gt Enter calibration point CN Get no of calibration points reqd CA Calibration accept CX Calibration abort CD Calibration date K0200 Issue No 1 44 DPI 740 User Manual PIN commands PP lt pin gt PIN protect command Automatic Commands AA lt device address gt Automatic device address AE lt error mask gt Automatic error reporting Read Commands RB Read battery volts RI Read instrument type and version number RE Read error status Protocol Format Commands FC lt flag gt Enable disable message checksum FA lt flag gt Enable disable addressed mode Key Commands KM lt flag gt Front panel key pad operating mode K0200 Issue No 1 DPI 740 User Manual 45 6 4Command Set All commands are of the format described in 6 2 In the following command description the start and terminating characters have been removed for clarity Parameters enclosed in are optional Input commands Command IC Set up input Format IC lt param type gt Description Set up input to measure parameter lt param type the index specifies the measurand lt param type gt can be any of the following P pressure input current input V voltage input T temperature input Note Only use pressure P for this instrument Query The corresponding query command allows the interrogation of the currently selected parameter Example IC The instrument replies IC P inpu
36. res the vertical distance between a level and a specific pressure datum Measurements of altitude are calculated from local pressure according to ICAO standard atmosphere tables defined in BS 2G 199 1984 The default pressure datum is the ISA 1013 25 mbar A user defined pressure datum can be entered by the SET ALT menu This datum can be a specified pressure datum known or required by the user such as true sea level pressure or airfield ground pressure at the time of measurement 101 fa fa UA IL Amen FA datum units of altitude pressing F1 steps to Pressure PROCESS and SET ALT menu Press F2 to step used to between calculate altitude feet and metres default value 1013 25 mbar Figure 3 5 Altitude measurement K0200 Issue No 1 DPI 740 User Manual 17 Entering a Pressure Datum for Altitude Measurement The indicator stores the pressure datum used in altitude measurement in volatile memory with a default value of 1013 25 mbar To enter a new pressure datum proceed as follows 1 Press the MODE push button to select altitude measurement mode confirmed by the display showing ALTITUDE on the status line 2 Press F1 to show the measurement menu 3 Press F2 to change the altitude settings by selecting SET ALT 4 Press F1 if the datum required is the ISA To enter any other datum press F2 5 Press either F1 F2 or SET to allow the datum to be entered the display stops flashing
37. s sent with the commands If the PIN is not sent or is incorrect this error is reported address error An invalid address packet was received A checksum The received command checksum did not match error with the calculated checksum With this error the command is not executed and this error reported 5 zero error An error occurred while trying to zero a measurand probably because the zero offset is too large 6 calibration Error in the instrument s calibration procedure error not enough calibration points 7 sequence error A valid command was received but can not be processed because the instrument was not in the correct state to execute command 8 command not This command was not available on this instrument available 9 range error Reading outside range 10 reserved 11 reserved 12 reserved 13 reserved 14 reserved 15 reserved K0200 Issue No 1 DPI 740 User Manual 61 Table 6 2 Table of Measurement Units The lt index gt used to identify all the units of measurement are defined below and are used by the IU and SU commands QO mbar 1 bor 2 Pa 3 hPa 4 kPa 5 MPa 6 kgf cm 7 kgf m2 8 mmHg 9 cmHg 10 mHg 11 mmH 0 12 cmH 0 13 mH 0 14 torr 15 atm 16 psi 17 Ibf ft2 18 inHg 19 inH 020 20 C 20 inH 004 4 C 21 ftH 020 20 C 22 ftH 004 4 C 23 inH 060 60 F 70 metres 71 eet K0200 Issue No 1 62 DPI 740 User Manual
38. t pressure Command IR Get input reading Format IR Description Request for a reading Example IR The instrument replies IR lt value gt where lt value gt is the reading in the selected units e g IR 1017 95 Query This is a query only command K0200 Issue No 1 46 DPI 740 User Manual Command lU Set up input units Format Description Query Example Command Format Description Example Query Example U lt index gt Set up the units for the input in volatile storage The units are specified as lt index gt defined in Table 6 2 A query of this command returns the index units IU Reply IU lt index gt a reply of IU 18 means units are inHg IA Enable automatic sending ofinput reading lA k Enables automatic sending of input reading The value k corresponds to send every kth conversion If k is 0 the automatic send feature is disabled IA 10 send a value every 10th conversion IA 0 disable the automatic feature A query responds with an integer of the automatic send interval in conversions IA Reply IA 10 K0200 Issue No 1 DPI 740 User Manual 47 Process commands Command PC Set up process Format PC lt process definition gt Description This command sets and defines the required process of the instrument The lt process definition gt must be in the format shown in the following table PC lt process defin
39. t 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 K0200 Issue No 1 34 DPI 740 User Manual a Procedure Figure 3 10 This sub menu divides into two selections a one point calibration and a two point calibration CAUTION THIS INSTRUMENT CONTAINS STATIC SENSITIVE COMPONENTS HANDLE WITH EXTREME CARE The calibration procedure is protected by a PIN and the CAL option link LK1 located on the PCB To carry out a calibration LK1 must be in thew position from previous sub menu set exit set up menu With the instrument connected to an appropriate pressure standard the calibration sub menu accessed through the set up menu sub menu One point calibration For the one point calibration the instrument stores the relationship between pressure and output Important note The calibration carried out at manufacture is a two point calibration against a pressure standard traceable to National Standards Carrying out a one point calibration can significantly down grade the instrument s accuracy if in doubt consult the manufacturer before proceeding Two point calibration This calibration provides a more accurate reading of the applied pressure the instrument calculating a more complex correction for the displayed reading K0200 Issue No 1 DPI 740 User Manual 35 t 01 01 96
40. tive ranges 35 to 1300 mbar a 35 to 2600 mbar a 35 to 3500 mbar a 4375 mbar a Maximum safe working pressure Display Read out 999999 LCD digits 13 6mm high with additional 16 text characters Overload indication Error code flashing s1 at nominal 110 FS Response nominal 2 readings second Resolution o 01 mbar e g 1013 25 mbar a K0200 Issue No 1 DPI 740 User Manual 3 Specification contd Electrical Power Supply ie 3 x 1 5 V alkaline size AA Connections external power adaptor charger ER International power jack RS232 serial communications 6 way LEMO type Electrical safety This instrument meets festege BS EN 61010 as applicable Electromagnetic compatibility This instrument meets EN50081 1 emissions EN50082 1 immunity Continuing development sometimes necessitates specification changes K0200 Issue No 1 4 DPI 740 User Manual 1 2 Accessories and Options The instrument is delivered with the following Accessories L User manual K200 this publication ii Calibration certificate UL Carrying case Options A Enhanced barometric accuracy over the range of 10 to 30 E 0 15 mbar B NiCad batteries and power adaptor charger Adaptor charger External Power 100 to 240 V a c nominal 10 VA 47 65 Hz Output nn un L2 Vd c 800 mA maximum Connection Ee International power jack C Adaptor c
41. ue No 1 52 Command Format Description Query DPI 740 User Manual CP Enter Calibration Point CP lt value gt The calibration point value is given by lt value gt in the currently selected units A query of this parameter CP returns the number of calibration points already recorded by this command The instrument also indicates that it is ready for the next calibration point Reply example CP 0 no cal points recorded CP 2 2 cal points recorded After entering all the points required to calibrate the instrument the accept calibration command CA must be sent to update the data in the instrument s nonvolatile memory K0200 Issue No 1 DPI 740 User Manual 53 Command Format Description Example Query Command Format Description Query Command Format Description Example CN Get number of calibration points required CN Returns the minimum and maximum calibration points required to carry out the specified calibration procedure IU 0 set up input as mbar PP 123 PIN entered put instrument into calibration mode CT 1 perform two point calibration CN Reply CN 1 2 requires between 1 and 2 calibration points This is a query only command CA Calibration Accept CA Accepts the calibrated data If the correct number of calibration points have been entered with the CP command then the calibration coefficients are calculated and stored in the instrument s no
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