Series HM28 Handheld Digital Manometer Service
Contents
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3. pressure mode Zero Normal print absolute diff and differential sets Diff to 0 Zoom print zero 1223 4 5 Measurement in large display figures Min Max print zero MAX 150 0 mbar With absolute pressure reset MIN 100 0 mbar reset to actual value Leak rate print zero 1234 5 mbar Only with Diff Rel display LEK 2 1 min unit time unit N N D D NO 3 oO D 3 O Q o o0 Tendency print 1013 2 mbar Only with absolute absolute TND 15 7 min pressure unit time unit Record 1 start stop clear REC 432 1 mbar If measurement memory STOP 30s MEM 1 memory cleared HEC 432 1 mbar Recording runs up to RUN 30s MEM 321 964 values 432 1 mbar Recording stopped STOP 30s MEM 901 Print Record print PRINT RECORD Appears only if values quick keystroke PUSH PRINT are stored max output speed PRT 432 1 mbar Printing display with 321 00 13 30 time PRT Record stopped Recording stopped Keystroke approx 1s single or fast output start stop printing 1 at 70 bar the measurements are stored in bar 3 4 Configuration Select mode Press gt on the display appears CONFIGURATION Store and exit Press gt 2 seconds onthe display appears SAVE CONFIGURATION START STOP PRINT CLEAR MODE HOLD ZERO Display example Notes set unit mbar kPa bar 2 UNIT mmH O mH O mbar mmHg psi inH O inHg hPa Pa MPa
4. Actuate the following key combinations e First press MODE and keep it pressed e Nextand additionally press CLEAR ZERO and keep pressed until CALIBRATION is displayed Exit from this mode is possible at any time via MODE or OFF The instrument must be in operation for at least 30 minutes warm up stabilization time New calibration values are only stored 1 when all five setpoints have been acceptable values acquired In the eventofamaloperation the calibration process is interrupted and the previous calibration data are retained An incorrect internal instrument tempera ture can lead to accuracy fluctuations The pressure set points have to be set in mbar Check the instrument accuracy after recalibration Notes 0 96 F S not available with absolute pressure Sensor running through correctly and 1 Calibration at 22 C 71 6 F environmental temperature Calibration Displa Point pay CALIBRATION 0000 09 FS CALIB 22 C Set set point x ide SET x mbar Press ZERO CLEAR set point x 25 F S SET x mbar _ ZERO CLEAR set point x 50 96 F S SET x mbar _ ZERO CLEAR 4 n set point x 75 96 F S SET x mbar _ DESEE ZERO CLEAR 5 set point x 100 F S SET x mbar Press ZERO CLEAR LOVE CONTROLS Division Dwyer Instruments Inc Highway 212 AT 12 Michigan City IN 46360 USA Phone 1 219 879 8868 Fax 1 219 872 9057 I HM28 0501 Art Nr 70 792 146
5. g kPa 0 245 psid g kPa 0 435 psig kPa 0 1000 psig a absolute pressure d differential pressure g relative pressure Conversion factors mbar h h qc The maximum load capacity applies for relative overpressure and negative agents containing solvents mbar mbar mbar mbar mbar mbar mbar 0 1 0 0010 10 20 0 7501 0 0145 0 4015 kPa bar English Range mmH O mmHg psi inH O 0 02953 inHg 1 0 hPa Max load capacity 12 5 35 150 150 400 400 400 700 1700 2700 2700 7000 14000 kPa kPa kPa kPa kPa kPa kPa kPa kPa kPa kPa kPa kPa 50 140 600 600 1600 58 58 100 245 390 390 inH2O inH2O inH2O inH2O inH2O psid g psia psia d g psia d g psid g psid g 1000 psig 2000 psig Max static pressure 700 700 700 700 700 700 700 kPa kPa kPa kPa kPa kPa kPa 1700 kPa 2700 kPa 2700 kPa 100 psid 100 psid 100 psid 100 psid 100 psid 100 psid 100 psid 245 psid 390 psid 390 psid 4 3 Power supply unit connection The HM28 can be operated by a regulated plug in power supply unit 5 Input Output Maintenance 115V 60 Hz 9 V DC 20 100 mA 7 to 14 V DC The HM28 requires no maintenance It can be cleaned with a damp cloth Do notuse cleaning pressure The instrumentis calibrated See the relevant chapters for battery change from 0 to
6. set high RESOLUTION Display resolution resolution1 low high influences measuring rate in RS 232 mode set damping off DAMPING 90 recovery after 4 on off measurements when ON set baudrate 9600 4800 2400 BAUDRATE 1200 9600 set auto off 1 10 60 min AUTO OFF Automatic switching off or continuous continue 10 min continuous mode set time unit minutes TIME UNIT For leak rate tendency hours hours minutes set 1 5 10 20 30 60s REC INTERVAL Off 2 record mode is Rec interval 2 3 5 10 30 60 min 5 s 1 3h deactivated 1 manual off max record interval set 2 5 Hz 400 ms DISPLAY RATE Normal mode indication zoom display rate 5 Hz 200 ms 2 5 Hz 400 ms influences DAMPING general reset set on default values zero GENERAL RESET PUSH ZERO Reset all settings and clear measurement memory GENERAL RESET RESET OK After actuating ZERO print configuration print now PRINT CONFIG PUSH PRINT Unit PRINT CONFIG PRINTING After actuating PRINT 1 If changed the measurement memory is cleared 2 See in 4 1 Technical data 6 3 5 RS 232 mode The HM28 can be remotely operated from a personal computer via an RS 282 interface The automatic switching off chapter 3 1 is inactive Connection by means of a RS232 cable Plug pin assignment RS 232 DB 9 female Pin Assignment Pin Assignment 1 DCD 6 DSR 2 TXD 7 RTS 3 RXD 8 CTS 4 DTR 9 SHIELD 5 GND Protocol
7. 100 of the measuring and recalibration range Exceeding or underrunning this range by up to about 10 is still displayed of her geometry Differential pressure sensors d doesn t measure the same value on the P and S side mandatorily because 12 6 Warning messages and faults Fault indication Possible cause Remedy ERROR 10 exceeding or under Apply permissible measuring OUT OF RANGE running of measuring range pressure CHANGE BATTERY Battery voltage too low Insert new battery No change in Over pressure applied to Dispatch instrument for repair measurement pressuresensor Fit new battery as required Battery possibly not correctly inserted Plug in power supply unit correctly Inaccurate recalibration Repeat recalibration Instrument inaccurate Vent and actuate zero Natural aging of the pressure Carry out recalibration sensor 7 Accessories Does not switch on No power supply Standard 1 9 V block battery 1 operating instructions Option Plug in power supply unit 115V 60Hz Leather case with carrying strap Service set Hand pump with variobellows 5bar Handpump 20 bar SCS test certificate Adapter RS232 9M 25F Adapter NPT 1 8 Communication SW package comprising RS232 IF cable 9 pole fem Communication software for MS Windows Measurement places management software for MS Windows 8 Calibration instructions Recalibration to be carried out by specially skilled staff only
8. 2 Please note warning symbol 1 in the operating instructions Copyright c by LOVE CONTROLS The contents of this publication may not be copied without the express permission of LOVE CONTROLS Subject to dimension and design changes 1 Description The LOVE CONTROLS handheld pressure gauge HM28 is a digital pressure measuring instrument with integrated pressure sensor for the measurement of differential relative or absolute pressures and vacuum Its versatile range of functions and high precision makes it suitable for a wide range of applications Configuration possibilities e Autom switching off selectable time e Selectable resolution and damping e Selectable units of time e Selectable measurement units General reset to standard setting e Selectable data transfer rate e Configuration printout e Selectable measuring intervals 2 Safety details The pressure values stated on the rating plate and mentioned in these operating instructions must not be exceeded otherwise the pressure sensor can be destroyed A 3 Operating Do not use the instrument in danger zones explosives zones Wear eye protection for pres sures gt 1bar 3 1 Switching on and off Switching on Press the ON key the maxi mum permissible measuring range and the class appears on the display For precision measurements the instrument mustbe switch ed on for at least 1 minute warm up phase Switching off Press the OFF key
9. ASCII commands 9600 4800 2400 1200 baud 8 bit no parity 1 stop bit XON XOFF protocol 17 dec 19 dec Notes The HM28 is switched on when the supply voltage is applied The HM28 sends XON every 3 seconds To determine the baud rate read in XON in each transfer rate until XON is correctly identified To go to remote control mode interrogate XON immediately send the remote command and then read in the acknowledgement ok Only lower case letters are accepted Observe 0 1 s delay before the next command after setbaud command To acknowledge the answer of the HM28 without reading it back just send a XON The symbol followed by the checksum must be suffixed to each string The string must be terminated with a CR A TAB is prefixed to each answer of the HM28 a suffixed and the checksum sent The answer is terminated with a CR The checksum is formed from the least significant byte of the command string Code decoding of control command readconfig Code Configuration Code Configuration Pressure unit Switch off time 5 MPa 7 70bar 0 60 min Pa 25mbar 7bar l1 continous kPa 2 1 min bar 3 10 min mH20 with 70bar Time unit otherwise mmH2O 0 hours mmHg not with 1 minutes 70bar Storage interval psi 10 s inH2O 20 8 inHg 30 s 60 s 2 min 3 min 5 min 10 min 30 min 60 min manual OLE 1 s not with 70bar hPa mbar Resolution 0 low 1 high Da
10. Operating instructions Digital handheld pressure gauge LOYE HM28 Contents 3 1 3 2 3 3 3 4 3 5 3 6 3 7 4 1 4 2 4 3 O N O Description Aussee 4 Safety details 4 Operating aan 4 Switching on and off 4 Pneumatic connection 4 Operating modes 4 Configuration 6 RS 232 mode 7 Battery change 10 Recalibration 10 Specifications 10 Technical data 10 Measuring ranges 12 Mains supply unit connection 12 Maintenance 12 Warning messages and faults 13 ACESSOS uu l gai ecu 13 Calibration instructions 14 Operating instructions ON On OFF Off MODE Select operating mode Pressure measurement Min Max Leak rate Datalogging DIGITAL MANOMETER HM28 0 200PSI CLEAR ZERO Zero setting PRINT HOLD Print and freeze display START STOP Data recording printing SET Select config modes PRINT SELECT Select config data OFF fa bos D Matrix display 2 Connection for pneumatic hoses LOVE CONTROLS Connection for plug in power supply unit Connection for RS 232 interface Important
11. Printed in Switzerland
12. mping 0 on 1 off Baudrate 1200 5 s 2400 Display rate 4800 0 5 Hz 9600 1 2 5 Hz Reply to control command readconfig A whole number is returned as a reply lsb f ttt dE HE msb HEF dE I III Pressure unit Hc bres Resolution hy cubre Damping lo Freeze Baudrate a a Switching off time icri n ci LEE Time unit FS Se Storage interval AS SSS SS SSS Display rate ejep jeoluyoe 99S sun Buipuodsauo 5 peadAe o ODUEUD ioujeuu 1e9 o pue SHuljas e 1eseH UONCDIPU 0197 uonejnDiuoo jenjoe 1nopeeH oww Bul ojerep 1819 4o 6 Oo tF qunyesodwe eujeju 1eBoui lu MO X9eq spues pue NOX Je sytem peddois Buipiooeu e6uel Jo 1no 1ueujeunseo A peddois si DuipiooeH peunseeuuJ pelos eyeboue1u eBueuo Adujie Yo IIN eqo Auoedeo Auayeq sre oualul H o ue Buunseoeui epou H NOX pues Buiwojoj opow jsejsseJdpeoJ 1x3 S N 02 1ndino Mol NOILNIOS3H s N O0 Lindino uB6iu NOLLQ1OS3H uonefoJ49jui jueujeJnseouiJ 1se J jueujeJnseeuJ leBoui lu jueuunJisul JO YOUMS ped ex 0 YoUMS ped ex xoolIq pu OJ UOD 910UIJ9J 0 U9IIMS uondijoseg do EL oy ere El aoj e 1 W m 40 qe1 GEL x BVC lt HO 9vL x poleen uol i6 Y 1 eBed ejqei ui Buipooep ees epoo qei qe E yo qe peo rs EICHE soul HO vch x enieA ger unsyoeuo
13. ode Class 0 2 Class 0 1 and 0 05 X X X X Measuring rate 3 normal mode 2 Memory capacity x x X x Memory interval X mmHg X psi X X inH O X X Display inHg X Pneum ports Linearity hysteresis and repeatability Case dimensions 10 C to 35 C 0 2 F S Weight incl battery 50 F to 95 F standard 1 digit 0 1 F S option 1 digit 0 05 F S Operating temperature Storage temperature Humidity Case protection class Power supply Current consumption Operating time battery Baud rate RS232 option 1 digit according to measuring range 5 C to 50 C 23 F to 122 F 20 C to 60 C 4 F to 140 F 30 to 95 rH IP 54 9 V battery IEC 6LR61 or accumulator regulated plug in mains supply unit 7 to 14 VDC 9 mA appr 70 h 9600 4800 2400 1200 baud 20 measurements s 10 measurements s 2 1 2 or 5 measurements s max 964 measurements manual 1 5 10 20 30 60 s 2 3 5 10 30 60 min LCD matrix 2 lines of 16 characters hose 4 6 mm or NPT 1 8 152x83x34 29 mm 270g 4 2 Measuring ranges Metric Range 2 9 Eu 20 30 50 100 110 200 700 1000 1700 3000 7000 O O O O O O O O O O O O o rounded kPa 0 10 inH2O kPa 0 28 inH2O kPa 0 80 inH2O kPa 0 120 inH2O kPa 0 200 inH2O kPa 0 14 5 psid g kPa 0 15 9 psia kPa 0 29 psia d g kPa 0 100 psia d g kPa 0 145 psid
14. or auto matic switching off 1 10 or 60 min after the last keystroke Incaseofatemperature change the instrument requires at least 30 minutes to adjust to the new ambient temperature 3 2 Pneumatic connection For measuring ranges up to 7000 mbar 4 6 mm or NPT 1 8 connectors can be connected depending on model Higher ranges are equipped with NPT 1 8 Ensure correct connection of the pneumatic hoses P S low pressure not available with the absolute and relative pressure version high pressure Measuring negative differential or relative pressures connect S I negative pressure or change ports S and P The HM28 will display a positive value e When screwing on a coupling it is important to hold with a span ner in the opposite direction Never hold at case only 3 3 Operating modes The modes inthe matrix below can be selected in succession by pressing the MODE key After switching ON the instrument is always in the mode normal START STOP PRINT CLEAR MODE HOLD ZERO SET SELECT UT E Bi Display example Notes Max Range Measuring range 200 mbar displayed in desired unit Full scale error Accuracy class as a 0 05 of full scale reading 123 45 mbar Only with differential or relative pressure Hold store indicated value 1013 2 mbar Only with absolute Normal print differential hold display and analogue hold DIF 1013 2 mbar
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