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OM-50 Manual

1. Cc Auto Second Measurement Meter mode data hour ano Measurement unit minute Cursor for selecting a setting modes Calibration i Setting modes differ history according to model Part name Display Contents Input channel Input channel 1 po __ Displayed when measuring dissolved oxygen Error No ERRNe Displayed when an error is generated Data No DataNo Displayed when the data number has been set OM 51 7 1 Overview of the Meter 1 4 Explanation of display Part name Display Contents Status display OG i Shows error number and data number Autot Blireorg Ea Ey Displayed when AUTO data memory is being performed eject Displayed when the serial communication is active Ate Displayed when temperature compensation function or automatic temperature compensation has been set Displayed during data memory function for 3 sec Displayed while data in memory is being called up and when manual data memory is being called up or blinks when automatic data memory is being called up Displayed when a printer is connected Sometimes displayed when a computer is connected depending on the computer Displayed during manual temperature compensation Not displayed during automatic temperature compensation HOLD Displayed while the data is held HOLD status Blinks during measurement or calibration Meter mode Displayed w
2. 4 12 70 14 9 97 24 8 25 34 7 13 5 12 37 15 9 76 25 8 11 35 7 04 6 12 06 16 9 56 26 7 99 36 6 94 7 11 75 17 9 37 27 7 87 37 6 86 8 11 47 18 9 18 28 7 75 38 6 76 9 11 19 19 9 01 29 7 64 39 6 68 10 10 92 20 8 84 30 7 53 40 6 59 96 HORIBA 7 2 Specifications 7 Reference 7 2 Specifications Measurement target Target ltem Description Measurement Thermistor principle Measurement 0 0 100 0 C Temp range Resolution 0 1 C Repeatability 0 1 C 1digit Measurement Membrane galvanic cell principle Measurement 0 00 19 99 mg L Dissolved range Oxygen Temperature 0 40 C compensation Resolution 0 01 mg L Repeatability 0 1 mg L 1 digit Measurement Membrane galvanic cell principle palate Measurement 0 0 199 9 Oxygen range Resolution 0 1 Measurement Membrane galvanic cell principle Oxygen Measurement 0 50 0 concentration range Resolution 0 1 OM 51 97 7 Reference 7 2 Specifications 98 Items in common among meter models Data memory Max 300 pieces of data capacity Power Dry cell batteries type AA alkaline with automatic power OFF function Ambient 0 45 C temperature Dimensions 170 H x 80 W x 40 D mm Mass of main unit 300 g including batteries HORIBA 7 3 Default settings 7 Reference 7 3 Default settings Category Item
3. 5 Command input If a command is input the corresponding response data is sent back Command input should be completed within 10 seconds Be sure to first set the meter to the On line mode using the On line Off line command Windows Corporation is a registered trademark of Microsoft 70 HORIBA 5 Printer 5 1 Connecting the printer 5 Printer This chapter explains the printer connection the times printing takes place and printing formats 5 1 Connecting the printer The following printers are compatible with OM 51 Printers O Citizen CBM 910 24RJ100 A Normal paper O Seiko DPU H245AS A03A Heat sensitive paper Attach the printer cable to the printer output connector B _ Connect your printer only after turning OFF the power to the main unit of the meter ee For the layout of the connector terminals for the printer output cable refer to 7 5 Pin layout of special cables page 101 ety e printer is not connected remove the printer cable from the meter and put the rubber cap securely over serial communication connector Be sure to use a cable that matches the printer OM 51 71 5 Printer 5 2 Printer setting 5 2 Printer setting Set up the printer using these settings Printer output baud rate 2400 bps Bit length 8 bits Parity none Setting for a plain paper printer CBM 910 Set DIP switch No 6 to ON and No 7 to OFF and pre pare the printer paper and i
4. EN61010 1 2001 Installation Environment This product is designed for the following environment Pollution degree 2 Measurement category WARNING Do Not use the equipment for measurements within measurement categories I ll and IV E FCC Warning This equipment has been tested and found to comply withthe limits for a Class A digital device pursuant to part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Precautions for use E Type and Definition of Signal Words For the safety use the meter is equipped with the Warning Labels to alert every operator and user to the possible risk and danger Before using understanding each message The meaning of signal words are as follows WARNING This indicates an potentially hazardous situation which if not avoided will result in death or serious injury CAUTION This indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury It may
5. ERR 10 is displayed and no more data can be stored OM 51 29 3 Functions 3 1 Data memory function _ WD Data cannot be stored unless the value has stabilized or in the CAL mode When the data is stored an ID number for that specific measurement can be registered see 3 3 5 Sample ID setting page 39 Calling up memory data 1 Press the key in the Measurement mode to load measurement data Displayed Manual data memory Blinking auto data memory EREE EE Sample temperature Data memory No Measurement mode EET Auto HOLD measurement HOLD Not displayed Instantaneous value Select and load the desired memory data item using the A and Y keys The displayed number returns to 0 after 300 the maximum number 30 HORIBA 3 Functions 3 1 Data memory function 2 Press the MODE key to display the data and time DO enoa Ur Su Q E A E a MEAS Select the desired data item using the A and Y keys 3 Press the MODE key to display the ID Select the desired data item using the A and V keys _ 0D If an error occurs while a data number is being displayed the error number will NOT be displayed When using a printer sold separately press the ENTER key while in the DATA OUT mode to print the data OM 51 31 3 Functions 3 2 Displaying and setting the clock 3 2 Displaying and setting the clock The clock needs to be when the meter is used for the first time or af
6. Prepare new zero and span standard solutions The stirring is inappropriate Stir the solution appropriately at a constant speed between 1000 and 1500 rpm Make sure the stirrer does not emit heat The electrode is defective If the DO tip is dirty clean it If the DO tip membrane is damaged or the DO tip is worn out replace it 85 6 Maintenance and Troubleshooting 6 2 Troubleshooting ERR No 09 Printer error Explanation If a problem occurs with the printer turn OFF the power to the meter perform the appropriate measure below and turn the power to the meter back ON Cause How to solve problem The printer Remove the jammed paper paper is jammed There is no Load the printer with paper printer paper There is a Reconnect the printer after making problem with the sure there is nothing wrong with the printer connector parts connection The printer is Replace the printer defective ERR No 10 Data memory over Explanation The number of data items has exceeded the limit of the memory Cause How to solve problem Memory over Delete data stored in the memory after confirming their contents 86 HORIBA 6 2 2 More troubleshooting 6 Maintenance and Troubleshooting 6 2 Troubleshooting This section explains how to respond to various symptoms of trouble that are not indicated by an error number Nothing shows up on the display w
7. Press the MEAS key to return to the Measurement mode from the Setting mode 34 HORIBA 3 3 2 Display and description OM 51 3 Functions 3 3 Setting modes Display Name Description ee Temperature Selects Auto Manual mode page Compensation for temperature 36 set Setting compensation DO Salt Sets salt concentration page DO Setting correction value of DO 40 measurement mode DO hpa Sets air pressure correction page h Setting value of DO measurement 41 Data Memory Selects Auto Manual mode page PA Setting for data memory function 40 ID Sets a number for a page i measured sample and 41 stores its data Maintenance Sets various maintenance page related settings 41 35 3 Functions 3 3 Setting modes 3 3 3 Temperature compensation setting 36 1 Press the SET key in the Measurement mode to enter the Temperature Compensation Setting mode 2 Pressing the ENTER key toggles between MTC and ATC settings ATC ATC Automatic temperature compensation when using a temperature sensor of the electrode ATC is displayed When a temperature sensor is connected the current temperature is automatically displayed When no temperature sensor is connected the display shows 25 C MTC Manual temperature compensation when an electrode temperature sensor is not being used and the temperature of the solution is known before hand MTC is disp
8. Remove the DO tip from the electrode body 4 Push the socket onto the DO tip and then store it by placing it in its original packaging and sealing it air tight DO tip Short socket ic hori not to damage the DO tip membrane When using a neutral detergent for cleaning be careful not to allow the detergent to come in contact with the membrane When conducting air calibration after the electrode has been stored first connect the electrode to the main unit of the DO meter and allow it to stand in the open air for two hours prior to conducting the calibration Cleaning electrodes Each time a different solution is to be measured rinse the electrode with pure de ionized water and then wipe off the water drops using clean filter paper or cotton gauze OM 51 81 6 Maintenance and Troubleshooting 6 2 Troubleshooting 6 2 Troubleshooting The meter is equipped with a simply error message function to notify the operator that an operation error or problem with the equipment has occurred Errors or other problems that occur while in the Measurement mode are announced by an error No appearing in the lower left hand corner of the display 6 2 1 Error message chart ERR No Message Explanation 01 Memory error Data cannot be read from or written to the internal memory 02 Battery voltage The battery voltage is low low 03 Electrode The electric potential did not stabilize stabilit
9. actions or conditions specifically mentioned to be avoided in the operation manuals Any trouble or damage attributable to use of the meter in ways or for purposes other than those described in the operation manuals If any repairs renovations disassembly etc are performed on this meter by any party other than HORIBA or a party authorized by HORIBA Any alteration to the external appearance of this meter attributable to scratches dirt etc occurring through normal use O Wear and tear to parts the exchange of accessories or the use of any parts not specified by HORIBA HORIBA also shall not be liable for any damages resulting from any malfunctions of this product any erasure of data or any other uses of this product Unauthorized reprinting or copying of this operation manual No unauthorized reprinting or copying of all or part of this operation manual is allowed The utmost care has been used in the preparation of this operation manual If however you have any questions or notice any errors please contact the HORIBA customer service center printed on the back cover of this operation manual Copyright HORIBA Ltd 2003 Precautions for use m CE Marking This product is in conformity with the following directives and standards Directives The EMC Directives 89 336 EEC The Electrical Product Safety Directive 73 23 EEC Standards EN61326 1997 A1 1998 EMISSION Class B IMMUNITY Category Minimum Require ment
10. at page atmospheric measurement site 41 pressure compensation _ WW RS 232C communications and the printer cannot be used simultaneously 4 HORIBA 1 Overview of the Meter 1 2 Functions Functions in Maintenance mode OM 51 Function Explanation Pade No LCD check Enables check for whether or not all LCD page segments are displayed 43 Battery voltage Enables simple check of battery voltage page check 44 Temperature Carries out temperature calibration page zero adjustment 45 Auto Power OFF Sets the function that automatically turns the page power OFF if no keys are touched 30 46 minutes Remaining data Displays the remaining memory page memory 47 Data memory Deletes data in memory page clear 47 Initializing Initializes all settings to the default values page settings 48 Printing test Conducts a printing test page 49 5 1 Overview of the Meter 1 3 Part names 1 3 Part names The OM 51 DO meter has the following parts Display ge AC connector J Dry cell battery holder Temperature connector Serial communication port Electrode connector 6 HORIBA 1 Overview of the Meter 1 4 Explanation of display 1 4 Explanation of display Input channel Error No Measurement Data No p 1 PL o2 Sat ratio Re item Year Temperature Status display month and day eset z HOLD A
11. attached to the DO meter 78 HORIBA 6 Maintenance and Troubleshooting 6 1 Dissolved oxygen electrode maintenance Long term storage 1 Remove the electrode from the DO meter 2 Wash the electrode well with pure de ionized water and then remove the water drops using cotton gauze 3 Remove the DO tip from the holder 4 Place the socket over the DO tip and then store it by placing it in its original packaging and sealing it air tight DOfp a Socket O ring Cleaning electrodes If the electrode membrane is dirty gently wipe it with soft tissue paper or cotton gauze Be careful not to push on the membrane with too much force _ Use caution not to damage the DO tip membrane OM 51 79 6 Maintenance and Troubleshooting 6 1 Dissolved oxygen electrode maintenance 6 1 2 Laboratory use electrode Maintenance after daily use 1 Wash the electrode well with pure de ionized water Wash bottle containing de ionized water Membrane 2 Store the DO tip by immersing it in zero standard solution Sensor adapter Z ro standard Aai solution Misses _ p Leave the electrode connector attached to the DO meter 80 HORIBA 6 Maintenance and Troubleshooting 6 1 Dissolved oxygen electrode maintenance Long term storage 1 Remove the electrode from the DO meter 2 Wash the electrode well with pure de ionized water and then remove the water drops using cotton gauze 3
12. blinking press the MEAS key Cou AI if MEAS fl Criteria for judging stability DO measurement Within 3 digit variance after 10 seconds Temperature 0 Within 2 C variance after 10 measurement seconds OM 51 17 2 Taking Measurements 2 4 Selecting the measurement modes 2 4 Selecting the measurement modes Pressing the MODE key changes the measurement mode The last measurement mode item is the clock display Pressing the MODE key once more returns the display to the first measurement mode Power ON 18 HORIBA 2 Taking Measurements 2 5 Dissolved oxygen DO measurement 2 5 Dissolved oxygen DO measurement Measuring dissolved oxygen basic operational flow The following shows the operational flow for dissolved oxygen DO measurement 1 Electrode preparation 4 Power g 2 DO Measurement mode instantaneous value Setting the clock page 33 Atmospheric pressure Auto Standard Solution Calibration Hold calibration Auto Hold calibration 3 Calibration mode For standard solution calibration Preparation for standard solution qm EO q i 4 Dissolved Oxygen Measurement mode instantaneous value 3 3 4 Auto data storage setting page 37 3 3 5 Sample ID setting page 39 Clear Hold le 5 Auto Hold Measurement 3 1 Data memory function page 29 OM 51 19 2 Taking Measurements 2 5 Dissolved oxygen DO measurement Electrode
13. dry cell bat teries is running low When this occurs replace the bat teries promptly Dry cell battery type AA alkaline _ WD O Insert the batteries paying attention to the orientation of the battery poles and O Removing the batteries will erase the clock data To save the clock data remove and replace the batteries while the meter is connected to the AC adapter sold separately O Replace the batteries only after turning the power OFF Any saved data will not be lost O When opening and closing the battery cover be care ful that no water gets inside the meter Check that the rubber packing is not twisted and no foreign matter is stuck to it Otherwise the meter may no longer be waterproof eg ss The life of the batteries included with the meter may be short because the batteries were used for the operation check before shipping To insert replace the batteries 1 Loosen the screw of the battery cover by using a coin or screwdriver etc The cover is constructed so that the stop screw cannot be completely removed and lost 2 Pull up the screw and remove the battery cover by sliding it out HORIBA 1 Overview of the Meter 1 7 Inserting replacing the dry cell batteries 3 If there are old batteries inside remove them 4 Place the new batteries in the meter verifying the orientation of the poles and 5 Check that the rubber packing is not twisted and no for
14. i HINT Entering the Maintenance mode Measure Item No Maintenance mode ment mode ane selection OM 51 49 3 Functions 3 3 Setting modes 50 HORIBA 4 4 RS 232C communications 4 1 Cautions before use RS 232C communications This chapter describes the use of RS 232C communications and its communication commands 4 1 Cautions before use OM 51 Use caution regarding the following points when using RS 232C communications O Use the following designated cable for connecting to the computer Part name PC cable for 50 Series Part number 9096004800 Make sure that the data transfer formats for the meter and computer match The following data transfer format is used by the meter Baud rate 2400 bps Character length 8 bits Parity None Stop bits 1 _ D If the data transfer formats differ communications errors may occur or the on line mode may not start up and RS 232C communications cannot proceed normally If the transfer format is changed turn the power to both the meter and the computer OFF and then ON again When creating a program for RS 232C put the meter in the ON LINE mode by entering an on line command at the beginning of the program The control switches become invalid when the meter is in the ON LINE mode and the RS 232C Communications mode is enabled LOCK is displayed The ON LINE mode is cleared when the power is turned OFF 51 4 RS 232C
15. items Required electrode Items standard solution Dissolved DO electrode oxygen Saturated oxygen Oxygen concentration Temperature Functions An overview of the functions found on HORIBA the OM 51 is shown below Function Explanation Fage No Data memory Stores the data of measured values and page temperature to the memory max 300 29 items Clock Displays the time on the screen and page recorded data 29 Auto Power Automatically turns off power if no operation page OFF is made after 30 minutes 46 RS 232C Enables the communication with a computer page communication using RS 232C 51 Printer output Prints the contents of the memory page 71 AC adapter The meter can be AC powered page connection 14 OM 51 3 1 Overview of the Meter 1 2 Functions Setting Items Page No Temperature Toggles between Automatic Temperature page compensation Compensation ATC mode that measures 36 the sample temperature using the temperature sensor built in the electrode and Manual Temperature Compensation MTC mode that uses user specified temperature Function Explanation Auto data Stores data automatically at an interval of 2 page memory sec to 24 hours 37 Sample ID Registration of sample ID page 39 DO salinity Compensates for salinity of sample page compensation 40 DO Compensates for atmospheric pressure
16. or it has been calibrated incorrectly Calibrate the meter correctly Check this point As shown in the diagram use a jumper wire or bent paper clip to short the meter by touching both the center pin and some metal part in the electrode connector If the flaching measured value disappears when this done the meter is nomal 90 Pll N A p dA al HORIBA 6 Maintenance and Troubleshooting 6 2 Troubleshooting The temperature display is blinking The temperature display does not change from 25 C The temperature measurement exceeds measurement range Measurement range 10 100 0 C Cause How to solve problem The temperature of the sample solution exceeds the measurement range Check the temperature of the sample solution and change to a sample solution that has a temperature within the measurement range The thermistor connection within the electrode is severed or shorted Measure the resistance of the temperature sensor connector If it is 50 kQ or more at room temperature replace the electrode The electrode connector is not attached properly Attach the electrode connector properly so that the O ring on the temperature connector disappears from sight The main unit of the meter may be defective In Temperature Display Calibration mode See Temperature zero adjustment item No 02 page 45 check whether or not th
17. reading stabilizes When the measured value stabilizes HOLD will stop blinking and the calibrated value will be displayed 24 Refer to Criteria for judging stability page 17 for the criteria for judging the stability of the readout To store the data press the A DATA IN key The memory number will appear and the display will automatically return to the Instantaneous Value Measurement screen HORIBA 2 Taking Measurements 2 5 Dissolved oxygen DO measurement Saturated oxygen measurement Saturated oxygen can be measured using the DO electrode Enter the saturated oxygen mode by pressing the MODE key in the DO measurement mode Oxygen concentration mode Oxygen concentration can be measured using the DO electrode Enter the oxygen concentration mode by pressing the MODE key in the DO measurement mode OM 51 25 2 Taking Measurements 2 5 Dissolved oxygen DO measurement Calibrating 26 with standard solution Normally air calibration is used to calibrate the meter when measuring DO When a higher level of measuring precision is required however a two point calibration using standard solution can be employed Calibration order for zero standard solution and span calibration solution is arbitrary The meter automatically determines the standard solution Preparing zero standard solution Put 50 g sodium sulfate into 1000 ml of de ionized water and mix it until it dissolves c
18. to proceed to the pai voltage check item No 01 HINT Entering the Maintenance mode Measure Item No Maintenance mode F ment mode selection OM 51 43 3 Functions 3 3 Setting modes 44 Battery voltage check item No 01 The battery voltage V is displayed Item No 01 Gig bari voltage alarm is set at approximately 2 2 V The measured voltage for batteries depends on the current The voltage shown in this mode will be a little lower than the actual voltage 1 Use the MODE key to proceed to temperature zero adjustment item No 02 HINT Entering the Maintenance mode Measure Item No Maintenance mode mentmode G selection HORIBA 3 Functions 3 3 Setting modes Temperature zero adjustment item No 02 This mode uses a known temperature to calibrate the temperature compensation value This mode is used when calibrating the temperature of the thermometer 1 Immerse the electrode in a liquid with a known temperature and set the temperature using the A and V keys Setting range 0 0 to 100 0 C 250 2S fic Item No 02 Beg og E sensor attached to the electrode maintains an accuracy of 1 C even without calibration The above mode should be used when a greater precision than 1 C is required 2 Use the MODE key to proceed to Automatic power off setting item No 03 HINT Entering t
19. 4 Operation flowChalrts cccccceseeeceeeeeeseeeeeeeeeeeeeeeeeeeeeeeeseeneeeeeeenseees 100 7 5 Pin layout of special Cables cssseeeeceeeeeeeeeeeeeeeeeseseeeeeeeeeeeees 101 7 5 1 RS 232C communications cable c ceeeeeeeeeeeeeeeeeeeeseeeeees 101 7 5 2 Cable for CITIZEN printer ccccccceeeeeeeeeeeeeeeeeeeeeeeeeneeeeeeeeeees 101 7 5 3 Cable for SEIKO printer scat area ate ulel awe ora Mee 101 7 6 Spare and optional Parts cccccssssseeeeceeeeseeeeeceeeeeesseeeeeeeeeeneees 102 7 6 1 Spare parts list yids ctas sie titadcelett a Ue teianttne tes baeeema tenet 102 FeO SOONG sessed a tices te area etal ea ue ee AAE ones uate on wtesee 103 Vi HORIBA 1 Overview of the Meter 1 1 Package contents 1 Overview of the Meter This chapter explains the part names how to connect the electrodes how to replace the batteries and precautions when using the meter 1 1 Package contents The following items are shipped with each HORIBA DO meter package Meter main unit 1 unit Dry cell batteries 2 pcs D Strap 1 pe OM 51 1 1 Overview of the Meter 1 1 Package contents Soft case Operation manual 1 book _ wD To take measurements you will need electrode s Refer to 7 6 Spare and optional parts page 102 when purchasing the electrode s 2 HORIBA 1 2 Functions 1 Overview of the Meter 1 2 Functions The OM 51 features the following functions Measurement
20. Air pressure is set to 1013 hPa as the default To change this setting refer to 3 3 7 DO atmospheric pressure compensation setting page 41 1 Remove any liquids from the membrane at the tip of the electrode by either drying it or wiping away the liquid with soft tissue paper making sure not to scratch the membrane 1 weer h i LY i ii 2 Press the CAL key while in the DO Instantaneous Value Measurement mode to select the Calibration mode 21 2 Taking Measurements 2 5 Dissolved oxygen DO measurement 3 Press the CAL key one more time to start calibration The measured value will be displayed and HOLD will blink until the reading stabilizes When the measured value stabilizes HOLD will stop blinking and the End will be displayed QE The mode cannot be changed while measurement is taking place in Auto Hold while HOLD is blinking on the display GG While HOLD is blinking To cancel calibration Clear the hold by pressing the CAL key again To fix the calibration value Fix the value using the ENTER key 22 HORIBA OM 51 2 Taking Measurements 2 5 Dissolved oxygen DO measurement 4 Press the MEAS key to return to the DO MEASUREMENT screen Calibrate using purified air Errors may occur and considerable time may be required before the reading stabilizes if calibration is conducted where there is severe fluctuation in temperature where there i
21. Default values Common Temperature Automatic setting compensation temperature compensation Manual temperature 25 C compensation Automatic power OFF Approx 30 min ON Sample ID 00000 Auto data memory OFF Dissolved Salinity 0 0 ppt oxygen Air pressure 1013 hPa OM 51 99 7 Reference 7 4 Operation flowcharts 7 4 Operation flowcharts The following flowcharts summarize DO meter operations p Atmosphere J Calibration mode tO Eee cee vO Automatic release of HOLD Release HOLD tO fean 1O Release HOLD to vO Release HOLD Clock display To DO measurement mode lt _ lt Clock setting Repeatability check lt gt Memory call up 100 HORIBA 7 Reference 7 5 Pin layout of special cables 7 5 Pin layout of special cables 7 5 1 RS 232C communications cable Meter main unit Printer MINI DIN8M D SUB 9 PIN 2 CTS 7 RTS 3 TXD 2 RXD 4 GND 5 GND 5 RXD 3 TXD 7 5 2 Cable for CITIZEN printer CBM 910 24RJ100 A Meter main unit Printer MINI DIN8M D SUB 25 PIN 2 CTS 20 BUSY 3 TXD 3 RXD 4 GND _ 7 GND 5 RXD 2 TXD 7 5 3 Cable for SEIKO printer DPU H245AS A03A Meter main unit Printer MINI DIN8M D SUB 25 PIN 2 CTS 8 BUSY 3 TXD 3 DATA 4 GND _ 5 GND 5 RXD 2 OPEN OM 51 101 7 Reference 7 6 Spare and optional parts 7 6 Spare and optional parts This s
22. HORIBA pe sees e gt INSTRUCTION A MANUAL DATA OUT e Preface Thank you for purchasing the OM 51 DO meter This meter is designed with a compact body that can be held in one hand and features a water resistant construction Note 1 It has a large sized LCD display which enables to use the varied functions by simple operations and especially will be convenient to use on location Carefully read this manual before using the meter Note 1 The water resistant construction of this meter conforms to IP 67 of IEC 529 entitled Water resistant testing and protection against penetration by solid matter for electrical machinery and equipment To maintain the water resistant construction of this meter follow the instructions in this manual when using the meter IP 67 standards Dust does not get into internal parts Water does not flow into internal parts when the meter is submerged 1 m below the surface of the water for 30 minutes at a temperature differential between the water and the device of 5 C or less HORIBA s Warranty and Responsibility Your meter is covered by HORIBA s warranty for a period of one 1 year under normal use Although unlikely if any trouble attributable to HORIBA should occur during this period necessary exchange or repairs shall be conducted by HORIBA free of charge The warranty does not cover the following Any trouble or damage attributable to
23. ainst accidental operation 2 2 Settings required before measurement The built in clock allows you to record the date of calibration and data memory storage When using the meter for the first time be sure to set this clock 3 2 Displaying and setting the clock page 32 OM 51 15 2 Taking Measurements 2 3 Measurement modes 2 3 Measurement modes 16 The OM 51 DO meter has an Instantaneous Value Measurement mode and an Auto Hold Measurement mode for all components of the solution being measured Instantaneous Value Measurement mode The OM 51 DO meter performs instantaneous value measurement as the default measurement mode when the power is first turned ON and when the auto hold measurement is cancelled or cleared For this reason the screen displayed when the meter is in the Instantaneous Value Measurement mode is called the initial screen in this manual Displayed HORIBA 2 Taking Measurements 2 3 Measurement modes Auto Hold Measurement mode Auto Hold Measurement mode maintains the display of the value measured when the meter automatically judges that the measured value has stabilized Press the MEAS key with the initial screeen displayed to make HOLD blink on the display When the measured value becomes stable HOLD will stop blinking and remain displayed and the measured value will remain displayed To clear the hold status or stabilized value when HOLD is
24. also be used to alert unsafe practices E Safety Precautions For the safety use be sure to read the following precautions AN WARNING eDo not use any unspecified AC adapters Heat or fire may occur to cause fire or accidents eDo not disassemble or modify the meter Heat or fire may occur to cause fire or accidents AN CAUTION eDo not use the serial communication or AC adapter in the place that may possibly contact with moisture It may cause fire electric shock or breakage ePart of the electrode is made of glass handle with care not to break it Indication Precautions for use WARNING This indicates an potentially hazardous situation which if not avoided will result in death or serious injury AN CAUTION This indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury It may also be used to alert unsafe practices U This mark indicates the operation requires a special care and attention J This mark indicates to which the reader should go for reference HINT This mark indicates reference information Precautions for use E Cautionary Items Precautions eDo not give physical shock to the meter like dropping or hitting eDo not immerse the meter into alcohol organic solvent strong acid strong alkaline and other similar solutions The meter contains ABS resin acrylic resin and various rubber products in its body eDo not
25. and is valid when on line when DO measurement or calibration are on HOLD After calibration is finished END will be displayed and the calibration coefficient will be stored in the memory 58 HORIBA 4 RS 232C communications 4 3 On line operation commands Data clear command format C DC CR LF Command code Data clear Header This command clears the data stored in the memory Data IN specification command format C IN CRI LF Command code Data IN specification Header O Valid only when manual data memory is set Power Off command format C OF CR LF Command code Power Off Header OM 51 59 4 RS 232C communications 4 4 Data request commands and responses 4 4 Data request commands and responses This section explains the commands that request meter data Format of responses from meter When no operation can be received ER n CR LF n 0 Communications error 1 Command code does not exist 2 Unacceptable timing entered 3 Data exceeds range When operation has been received A When data is requested the result of the request is sent out according to each format B When an operation command has been issued OK is sent back Format OK CR LF 60 HORIBA 4 RS 232C communications 4 4 Data request commands and responses Clock data request command and response Request command format R OT CR LF RI Command code Header Meter response form
26. andard solution The response is slow Cause How to solve problem Some effects of the sample Response time may slow down depending on the properties of the sample solution The electrode is dry or dirty Wash the responsive membrane The electrode is cracked or worn out Replace the electrode 88 HORIBA 6 Maintenance and Troubleshooting 6 2 Troubleshooting The indicated value does not change or there is absolutely no response OM 51 Cause The key lock function is ON How to solve problem Turn the power OFF and then turn it back ON again The system is locked Turn the power OFF and then turn it back ON again The electrode connector is not Attach the electrode connector correctly attached correctly DO meter is Contact your local HORIBA defective distributor 89 6 Maintenance and Troubleshooting 6 2 Troubleshooting The measured value is blinking The measured DO value exceeds the measurement parameters when DO value is displayed Display range 0 00 19 99 Cause How to solve problem The sample solution is inappropriate Change to a sample solution with properties within the measurement range The electrode cable has been severed Replace the electrode The main body of the meter is defective Check the point described below The meter has not been calibrated
27. at ROT XXXX XX XX XX XX xx CR LF Seconds 2 digit 0 59 Minutes 2 digit 0 59 Hours 2 digit 0 23 Day 2 digit 01 31 Month 2 digit 01 12 Year 4 digit A D lead zero is suppressed Header OM 51 61 4 RS 232C communications 4 4 Data request commands and responses Measurement request command and response Request command format R MD CR LF Command code Header Meter response format RMD XXXXX X X X X X X XXXX XM XX XKXXXX gt Measurement value 6 digits Lead zero is sup E Seconds 2 digit 00 59 Minutes 2 digit 00 59 Hours 2 digit 00 23 Hours 2 digit 00 23 ay 2 digit 01 31 Year 4 digit dominical year lead zero is suppressed lon type 1 digit SP Measurement status 1 digit 0 Instantaneous value 1 Hold 2 Potential hunt in progress Measurement or calibration 1 digit 0 Measurement 1 Calibration Channel number 1 digit 1 1CH Measurement mode 1 digit 4 Dissolved oxygen 7 Saturated oxygen 8 Oxygen concentration Sample ID 5 digit eader 62 HORIBA 4 RS 232C communications 4 4 Data request commands and responses X X X XXXXMK XXxXXX Xx CR LF Error code Error No display 2 digit One error No which takes precedence over others is output When the measurement calibration type is 0 The latest data is output regardless of occurrence of measurement errors 1 SP is output when any calibration err
28. communications 4 1 Cautions before use Lilf data is requested but not received create the program structure to have the data request repeated after a short waiting time This will provide more reliable communications jlf RS 232C communications is not used cover the RS 232C port with a rubber cap OThis system does not carry out control using DCD CTS or DSR Note this point when creating a program 52 HORIBA 4 RS 232C communications 4 2 Command list 4 2 Command list OM 51 Use lt CR gt lt LF gt as the terminator for serial communication commands All the commands except the ON LINE OFF LINE command are valid only in the ON LINE mode An error message is returned in the OFF LINE mode The meter returns a response to any operation made in the following format OK lt CR gt lt LF gt If the meter does not accept the operation it returns an error message in the following format ER n lt CR gt lt LF gt n 0 Communication error 1 When a non existent command is input 2 When a timing command is input to which the meter cannot respond 3 When the numerical value in the command is out of the setting range 53 4 RS 232C communications 4 2 Command list On line operations commands Command Command item Command Page No Header eae On line off line C OL page 56 Halt potential hunting BR page 58 DO Measurement m
29. e Minus display appears regardless of whether or not there is a tempera ture connector There is a problem with the setting for the temperature display calibration mode see page 45 Initialize the settings see page 48 OM 51 91 the 6 Maintenance and Troubleshooting 6 2 Troubleshooting Measurements are not repeatable Cause How to solve problem The responsive Wash the responsive membrane membrane is dry or dirty The responsive Replace the electrode membrane is cracked or worn out When the printer will not print even though it is connected Check the following points Is the printer turned ON Has a printer error occurred Is there printing paper Has the paper jammed When running a test print according to the manual does it print out correctly 92 HORIBA 7 Reference F Reference This chapter provides a simple compilation of information for those who would like to know about the functions of the main unit of the meter and other measurement principles in greater detail It also serves as a reference for spare and optional parts OM 51 93 7 Reference 7 1 Dissolved oxygen measurement 7 1 Dissolved oxygen measurement Measuring dissolved oxygen 94 Dissolved oxygen DO is the concentration of oxygen that is dissolved in water DO is essential in the self cleaning mechanism of rivers and seas and for fish and
30. ection lists spare and optional parts for the meter These parts are available through HORIBA distributors Place an order specifying their name model and part number 7 6 1 Spare parts list DO electrode Water proof DO 9520 10D 9096000500 Water proof type electrode For laboratory use 9551 20D 9096002300 On site immersion type Cable length 2 m 9551 100D 9096002400 On site immersion type Cable length 10 m DO electrode spare tip Spare tip 7541 9074000200 For 9520 5401 9033010000 For 9551 102 HORIBA 7 Reference 7 6 Spare and optional parts 7 6 2 Options Part name Part number Remarks AC adapter 9096003100 Be sure to Stee cae posi eE aoe purchasing the For Europe 9096003400 AC adapter For Japan 9096003500 Printer For US 9096003600 Plain paper For Europe 9096003700 printer Printer cable 9096003800 Roll paper 9096003900 Ink ribbon 9096004000 Serial cable 9096004800 Data collection software 9096005000 For PC Soft case 9096005100 Strap 9096005200 For the meter Stand for electrode 9096002700 Stand arm 9096002800 OM 51 103 For any question regarding this product please contact your local agency or inquire from the Customer Registration website www horiba co jp register First edition August 2003 HORIBA Ltd CODE 11001383000
31. eeeeeeeeeeees 32 3 3 Setting MOGES sivsvenicccstsesdacivavivanecaccteanasdassesaddearaatncreavevvedensduaaviyais 34 3 3 1 Entering the Setting mode eee eeeeeeeeeeeeeeeeeeseeeeeeeeeeenees 34 3 3 2 Display and description cczcecits cnc eee cucu Maeetteiae ec vcuetiadndiadecnee 35 3 3 3 Temperature compensation Setting ccccccccccceeeeeeeeeeeeeesseeeeees 36 3 3 4 Auto data storage setting siisicsitecccrinsctttn ee gleiptecececievielatsigteeieaie 37 3 3 5 Sample ID setting wii aicn ce ee a A Ate ala 39 3 3 6 DO salinity compensation setting cccceeeeeeeeeeeeeeeeneeeeeeeeeees 40 3 3 7 DO atmospheric pressure compensation setting ceeee 41 3 3 8 MaInIenanceMOde 2csisne indie aint eect 41 4 RS 232C communications 51 4 1 Cautions before USC cccccccscssseeeeeeeeseeseeeeeeeeeeeeeeeeeeeeeeeeneeeeeeeesenees 51 4 2 SC OTMIMAR CIES Bice oe suis ccnsiecaeeatyactaeanecavectvsisenteuiaseayeannestoaiycansnmemvnnineas 53 4 3 On line operation commandsS ccesseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeneees 56 OM 51 V CONTENTS Ts a sz 4 4 Data request commands and reSpONnses ss eccceeseseeeeeteeeeees 60 4 5 Communication example using the HyperTerminal 69 5 sPMMNGD is nett oncaeid beeen ad bee as pees 71 5 1 Connecting the printer oo iicsccciccsaeciienscescdeedenensasdsonenewascnieans 71 5 2 PLINT R SOT Ge vcri teinccasscunpiayicnerandanveatnsnineaustinsvan
32. eign matter is stuck to it 6 Insert the edge of the battery cover into the grooves on the meter and then tighten the stop screw k l Batteries Grooves Rubber packing M Check that the rubber packing is twisted and no foreign matter is stuck to it Otherwise the meter may no longer be waterproof Battery life The table below shows the battery life of alkaline batteries during continuous use The life of manganese batteries is about a half of the alkaline batteries Battery life approx 200 hours OM 51 13 1 Overview of the Meter 1 8 Connecting the AC adapter 1 8 Connecting the AC adapter When using the meter with an AC power supply use the designated AC adapter option AC adapter specifications Supply voltage range 100 200 V AC Frequency range 50 60 Hz Current rating Max 370 mA Class2 Power supply Equipment pro tected by double insulation Indoor use only Supply voltage fluc tuations allowed up to 10 When the AC adapter is connected the meter is no longer waterproof Be careful not to let water get into the meter 14 HORIBA 2 Taking Measurements 2 1 Turning the meter ON OFF 2 Taking Measurements This chapter explains how to take basic measurements 2 1 Turning the meter ON OFF Pressing the ON OFF key turns the power on off The ON OFF key functions when it is pressed continuously for about one second to protect ag
33. emperature compensation setting 0000 pe Manual mode MTC z Auto mode ATC Oxygen Concentration mode ID 5 digits 2008 1 1 5 07 Oe A ares Temperature compensation setting _ F000 nee Manual mode MTC Auto mode ATC 74 HORIBA 5 Printer 5 4 Printing format 5 4 2 When the manual data memory storage is performed in the Measurement mode The printer prints the data memory No in the first line and the data in accordance with the format same with the one in 5 4 1 When the ENTER key is pressed in the Measurement mode P 74 Example in the DO Measurement mode Qata No 068 Data memory number 20037 17 9 4 31 DO f Ganl C 25 8 C ID OQ080 Example in the Oxygen Concentration Measurement mode ata No Data memory number 7808 1 5 07 02 21 1 ATC 25 0 C D O0000 Example in the Saturated Oxygen Measurement mode ata_No 003 Data memory number 2003 1 1 5 08 Sat ratio 105 8 ATC 25 0 C D 00000 5 4 3 When the ENTER key is pressed in the Data Memory Call screen The format is the same as that described in 5 4 2 When the manual data memory storage is performed in the Measurement mode page 75 OM 51 75 5 Printer 5 4 Printing format 5 4 4 When calibration or check is performed in the Calibration mode DO atmospheric pressure calibration 2003 17 9 4 32 g c When calibration is xa ALIBRATION OK pe
34. euanindvensicunsamenivaninent 72 5 3 Printer output timing esdeccestiinwiccunwasecaverswncesnedsias iuawenterevcuideasetounneant 73 5 4 Printing format reaa aaiae sardana standarra duanean aanika aaant aAa 74 5 4 1 When the ENTER key is pressed in the Measurement mode 74 5 4 2 When the manual data memory storage is performed in the MEASUTEMENE mode rcdi a a bandh AE EE aa ia eaae 75 5 4 3 When the ENTER key is pressed in the Data Memory Call screen 75 5 4 4 When calibration or check is performed in the Calibration mode 76 5 4 5 Test printing format in the Maintenance mode 000e 76 6 Maintenance and Troubleshooting 77 6 1 Dissolved oxygen electrode maintenance cccccceesseeeeeeeeeeeees 78 6 1 1 Field se electrode sitccsccettieicseiticennicstincteieteisituccetd weetespiiadeneuriace 78 6 1 2 Laboratory use electrode 0 ccceccecccceeeeeeeeeeeeeeeeeeeesaeeeeeeeeeeees 80 6 2 Troubleshooting wisieisnsseccncesivecssanteicsviniensvadesivevinesuecntivesssuneuawienninasiia 82 6 2 1 Error message Chant rosanero a 82 6 2 2 More troubleshooting is icciiie noi ign Bt 87 1 Refer nt 25 22 644 00d Sots oiiwa Shwe t aes 93 7 1 Dissolved oxygen MeaSUreMen eecceeeeeeeeeeeeeeeeeeeeeeeeeteeneees 94 1 2 SPSCHICATONS vsisviciiencessisisisncarnsaawe eenean aeae adi daraanan in aoaia diiad 97 7 3 Default SOT S iacieisccaeiecnictudiatacanecandeiientnnntonia fis aan enn dwabvncnenendwivininant 99 7
35. f stored data items exceeds 300 data storage will stop and the error message ERR No 10 will be displayed 3 3 5 Sample ID setting Setting the sample ID records its sample ID number as well as the measured data at time the data is stored 1 Press the SET key in the Measurement mode to enter the ID Setting mode 2 Use the ENTER key to select the digit td GGG gr tel 3 Specify a numerical value using the A and W keys Setting range 00000 to 99999 OM 51 39 3 Functions 3 3 Setting modes 3 3 6 DO salinity compensation setting 1 2 Press the SET key in the Measurement mode and select the DO Salt Setting mode Pressing the ENTER key toggles between seawater salinity SEA and a user defined value oo iO y ef 56F Specify a numerical value using the A and Y keys Setting range 0 0 to 40 0 ppt n The predefined seawater salinity SEA is 35 ppt 40 HORIBA 3 Functions 3 3 Setting modes 3 3 7 DO atmospheric pressure compensation setting 1 Press the SET key in the Measurement mode and select the DO hpa Setting mode xO RFR iF Im 2 Specify a numerical value using the A and W keys Setting range 100 to 1999 hPa 3 3 8 Maintenance mode Press the SET key in the Measurement mode and select the Maintenance mode The LCD CHECK screen Item No 00 will appear BE a Item No LL ee t OM 51 3 Functions 3 3 Setting
36. for the disposal of the meter treat it as an industrial waste CONTENTS 1 Overview of the Meter 20005 1 1 1 Package contents iiiceiciscccssiseteniscesnenataucuivantndecsedivararauavsedereetuananauee 1 M2 PUNCUOIG E E E A A 3 1 3 Part NAMOCS soiien inina aeie daoa aneneen Tentamen han renen itani 6 1 4 Explanation of GISPlay ccciiiiesiscisinceetenedtiwidivnndeasaandanduabundadecanaeaentawes 7 1 5 Operation KCYS wiissicersecveniecsiecsirecinisarecnersiernseseaecneriiaasiecwneianedens 9 1 6 Connecting the electrodes ccccsseecceeeeeseseeeeeeeeeeeeeeeeeeeeeeeeeeenees 10 1 7 Inserting replacing the dry cell batteries ccsseeeeeeeeseeeeees 12 1 8 Connecting the AC adapter 0 cc eeccceeseeeeeeeeeeeeeeeeeeeeeeeeeeeeeenees 14 2 Taking Measurements 2 20005 15 2 1 Turning the meter ON OFF cccccccsssseeeeeeeeeseeeeeeeeeeeeeeseneeeeeeeeeseees 15 2 2 Settings required before measurement cccesseseeeeeeeeeeees 15 2 3 Measurement modes 0 cseeeceeeeeeesseeeeeeeeeeeeseeeeeeeeeeeeseeeeeeeeeeeneees 16 2 4 Selecting the measurement modes ccccseceeeeeeeeeeeeseeeeeeeteeeeeees 18 2 5 Dissolved oxygen DO measurement ssccceeeeeeeeeeeeeeeeeeeees 19 3 PUNGCUHIONS set bite dikan niie ea A 29 3 1 Data memory TUNCUON ssi avedicnicstiepientienninnesidivthinatamtsaninertaeldunianedins 29 3 2 Displaying and setting the CIOCK ccsssseseeeeeeeseee
37. he Maintenance mode Measure Item No Maintenance m To ment mode ane selection OM 51 45 3 Functions 3 3 Setting modes Automatic power off setting item No 03 This turns the Automatic Power off function ON OFF and sets the time until the power is turned off When the Automatic Power off function is set to ON the power to the meter automatically turns off if the keys are not operated for the set amount of time 1 Press the ENTER key to toggle between ON and OFF When set to ON set the time for the power to be turned OFF using the A and keys Setting range 1 to 30 minutes Item No 03 2 Press the MODE key to proceed to Item No 05 Remaining data memory HINT Entering the Maintenance mode Measure E Item No Maintenance mode ment mode selection 46 HORIBA 3 Functions 3 3 Setting modes Remaining data memory Item No 05 Displays the number of data items that can still be stored Number of remaining data memory items Item No 05 1 Press the MODE key to proceed to Data memory clear item No 06 HINT Entering the Maintenance mode Measure Item No Maintenance mode F ment mode annie selection Data memory clear Item No 06 1 Pressing the ENTER key clears all the data stored in the memory Pie F oun L L Eii End Item No 06 2 Press the MODE key to proceed to Initial
38. hen in Measurement mode Displayed when in Calibration mode HORIBA 1 5 Operation keys 1 Overview of the Meter 1 5 Operation keys OM 51 This section describes the functions of the keys Name Description MEAS key Returns to the Measurement mode Starts measurement MODE key SET key Selects measurement item Selects setting item CAL key Enters the Calibration mode Starts calibration UP key Executes the data memory function Increases numerical value ENTER ke em y Establishes the setting Data Dri DOWN key Calls up data memory Y Decreases numerical value ON OFF Turns ON OFF the power key This key takes effect only after pressed for one second to prevent accidental operation _ Ww The automatic power off function is a default setting for this meter The power is automatically turned OFF if no operation is performed after a period of approximately 30 minutes 1 Overview of the Meter 1 6 Connecting the electrodes 1 6 Connecting the electrodes Connect the electrodes to the DO meter using the fol lowing procedures Use special care to ensure that no water or dirt come in contact with the connector during connection procedures Electrode connector DO electrode Temperature connector Temperature electrode Electrode connector G R electrode 1 Insert the electrode connector making su
39. hen the power is turned ON Cause How to solve problem No batteries Place batteries in the meter The batteries are loaded with the poles reversed Re insert the batteries with the poles correctly oriented The battery voltage is low Remove the old batteries and correctly insert new dry cell batteries Or connect the unit to the optional AC adapter The indicated value fluctuates When there is a problem with the electrode Cause How to solve problem The responsive membrane is dry or dirty Wash the responsive membrane The responsive membrane is damaged or worn out Replace the electrode There are air bubbles on the electrode Shake the electrode to remove the air bubbles OM 51 87 6 Maintenance and Troubleshooting 6 2 Troubleshooting When there is a problem with the main unit of the meter Cause How to solve problem There is a motor or other device causing electrical interference Move the meter to a place where it is not subject to dielectric effects Be sure to ground devices that are using commercial electricity The electrode is not connected correctly Connect the electrode correctly When there is a problem with the sample solution Cause How to solve problem Some effects of the sample Determine if this is the cause by measuring with a stable st
40. ibration in the two point calibration repeat steps 3 and 4 6 To return to the MEASUREMENT mode press the MEAS key I TET is being performed in the calibration mode redoing calibration for a standard solution updates the calibrated values for the standard solution only If calibration is redone after returning to the measurement mode however the calibration will be performed in the initial state of the DO meter resulting in clearing all the previous calibration data HORIBA 3 Functions 3 1 Data memory function 3 Functions This chapter describes the various functions of the DO meter 3 1 Data memory function The measured data can be stored automatically or manually Auto data memory You can automatically store the data at certain intervals using this function For the setting procedure refer to 3 3 4 Auto data storage setting page 37 Data memory In all measurement modes you can store data when the instantaneous value is measured or the measured value is held HOLD status during the Auto HOLD measurement by pressing the A key The measurement reading is stored along with the temperature data HOLD value instantaneous value ATC MTC and sample ID at the time the measurement was taken After the data number is displayed the screen returns to the initial screeen Up to 300 items of data can be stored in the memory If the number of data items exceeds the maximum limit
41. igit 4 Dissolved oxygen 7 Saturated oxygen 8 Oxygen concentration 66 HORIBA 4 RS 232C communications 4 4 Data request commands and responses X X X XXXKX XXXXX XX CR LF Error code Error No display 2 digit One error No which takes precedence over others is output When the measurement calibration type is 0 The latest data is output regardless of occurrence of measurement errors 1 SP is output when any calibration error is pro duced Potential 5 digit Temperature 5 digit including decimal point 10 0 to 10C Right aligned with blank digits filled with spaces Temperature setting 1 digit 0 ATC 1 MTC Unit 1 digit 0 none upplementary unit 1 digit 0 none 1 u 2 m OM 51 67 4 RS 232C communications 4 4 Data request commands and responses Request command for model and its response Request command format A RS CR LF Command code Header Meter response format ARS x yyyyyyy CR LF Lot No 7 digit Model 9 OM 51 Header Request command for software version and its response Request command format A AV CR LF Command code Header Meter response format AAV KAXXXXXNXXNXX CR LF Software version 12 digit Header 68 HORIBA 4 RS 232C communications 4 5 Communication example using the HyperTerminal 4 5 Communication example using the HyperTerminal OM 51 For reference communication using the HyperTerminal that comes with Windows
42. is described here 1 4 Open the HyperTerminal Start gt Programs gt Accessories gt Communications gt HyperTerminal The HyperTerminal program Hypertrm exe is activated Make the setting for name connection and port Select the COM port of the PC currently being used for the port setting Set the COM port of the PC and set the transmission parameters as follows Baud rate 2400 bps Character length 8 bits Parity none Stop bit 1 bit Make the settings in the properties dialog box File gt Properties gt Settings Horiba Properties Connect To Settings Funcion aroe and cal kaug act Tamra kes D Windows kegs Eskia bess tere H Del O rH Space Ce E rust Bako dateci s Taine baiana 1D ANZI Seckscrof butis fex 500 LI Fisy round when connecting o disconnecting Input Tiada S50 Saip 69 4 RS 232C communications 4 5 Communication example using the HyperTerminal File gt Properties gt Settings gt ASCII Setup ASCII Setup ASCE Sering Send line ends wih line isad E Echo tpped characters locally Lre ddm 1 Millissconds Character dels 71 mikec 4500 Receseng F Append line feeds to incoming line ends Foca incoming dais bo 7b ASCII T rap lines ha evceed berminal width C _ wD You can check the contents transmitted via HyperTerminal by enabling the Echo typed characters locally E option
43. ization of setting item No 07 HINT Entering the Maintenance mode Measure Item No Maintenance m q ment mode alptenanen node selection OM 51 47 3 Functions 3 3 Setting modes Initialization of setting item No 07 This mode returns all settings to the default settings Use this mode to return the meter to the original settings when the meter was purchased 1 Press the ENTER key to initialized the settings EEPn Endo Item No 07 2 Use the MODE key to proceed to Printer con nection and printing test item No 08 _ The setting values to be initialized are shown on page 99 HINT Entering the Maintenance mode Measure Item No Maintenance mode ment mode selection 48 HORIBA 3 Functions 3 3 Setting modes Printer connection and printing test item No 08 A printing test is conducted if a printer is connected 1 Press the ENTER key to start the printing test When conditions are normal End is displayed When conditions are not normal Err is displayed When the printer is connected and power is ON t _ End weten Peam Prrng or power is OFF Item No 08 2 Press the MODE key to return to the first item in the maintenance modes LCD check Test print format egri Oat 0125 456 feo lt gt 7BARCOEFG HI JKLMNOPGRS TLE YZ _ abcdefohiJik l moo rar stuvwnyet
44. layed Set the temperature using the A and keys Setting range 0 0 to 100 0 C HORIBA 3 Functions 3 3 Setting modes 3 3 4 Auto data storage setting OM 51 You can set the meter to automatically store data at certain intervals 1 2 Cancel the Auto Power OFF function Press the SET key in the Measurement mode to enter the Data Storage Setting mode Pressing the ENTER key toggles auto data storage function ON and OFF Auto of F Memory interval setting 4 5 Press the MODE key to toggle between hour minute and second Specify a numerical value using the A and W keys Setting range 24 hours to 2 seconds 37 3 Functions 3 3 Setting modes Carrying out auto data storage 1 Press the MEAS key to return to the Measurement mode 2 Press the A key Automatic data storage will commence The first data is recorded when the preset time has reached the preset starting time 7 O E a iat gg ny r MEAS _ WD Do not turn the power ON OFF during automatic data storage The reliability of stored data may be compromised depending on when the ON OFF key was pressed 38 HORIBA 3 Functions 3 3 Setting modes 3 Press the CAL key Automatic data storage will end _W During automatic data storage the MEAS MODE SET ENTER keys cannot be used Data recording time will differ 1 seconds from the time set by the storage interval If the number o
45. modes Maintenance setting items Use the MODE key to toggle between Maintenance mode items Item pani Page No Item Description No 00 LCD check Enables check to see if all page LCD segments are displayed 43 01 Battery Enables simple battery page voltage check voltage check 44 02 Temperature Carries out temperature page zero calibration when the 45 adjustment temperature sensor is immersed in a liquid of known temperature 03 Automatic Turns Automatic Power off page power off function ON OFF and sets 46 setting time period after which the power will be turned off when no keys are touched 05 Remaining Displays number of data items page data memoriy that can still be stored 47 06 Datamemory Clears all data in the data page clear memory 47 07 Initialization of Initializes all settings to default page setting values 48 08 Printer con Carries out a printing test page nection and 49 printing test 42 HORIBA 3 Functions 3 3 Setting modes LCD check item No 00 Displays all segments of the LCD 1 Press the MODE key in the Maintenance mode to show item No 00 2 Press the ENTER key Compare the LCD screen with this diagram to confirm that all segments of the LCD are displayed ch mW pH DO Salt rey 5 EL Oo Sm ratio Flosist 0608 GHB8E L do 28887 Item No 00 d006cu en MSO d uea Hi in 3 Use the MODE key
46. nk ribbon Keep the LF key held down The printer prints only when the LF key is being pressed Setting for a thermal paper printer DPU H245AS Prepare printer paper and turn ON the power switch with the FEED and CHARGE switches held down Set the baud rate of the printer to the above value referring to the instruction manual for the printer Start the function setting mode of the printer and change it to the above settings 72 HORIBA 5 Printer 5 3 Printer output timing 5 3 Printer output timing OM 51 The printer prints at the following times U When pressing the ENTER key after Auto Hold or while the instantaneous value is being displayed in the Measurement mode When the manual data memory storage is performed in the Measurement mode When pressing the ENTER key while in the Data Memory Call mode When calibration or check is performed in the Calibration mode When the ENTER key is pressed in the calibration history display When test printing is selected while in the Maintenance mode 73 5 Printer 5 4 Printing format 5 4 Printing format The following are sample printouts 5 4 1 When the ENTER key is pressed in the Measurement mode DO Measurement mode 20037 17 9 4 27 ID 5 digits Sa are ee Temperature compensation setting Manual mode MTC z Auto mode ATC Saturated Oxygen mode ID 5 digits 2003 1 1 5 07 Ba svallle yee f T
47. ode designation DO page 56 Saturated oxygen measurement SR page 57 designation Oxygen measurement designation 02 page 57 Start measurement MS page 57 Start DO calibration CA page 58 Data clear DC page 59 Data In designation IN page 59 Power Off OF page 59 54 HORIBA 4 RS 232C communications 4 2 Command list Request data commands Command Request for Command Page No Header code Clock data R OT page 61 Measurement MD page 62 Number of stored MC page 64 data items Memory data MS page 65 Model inquiry A RS page 65 Software version AV page 68 inquiry OM 51 55 4 RS 232C communications 4 3 On line operation commands 4 3 On line operation commands This section explains the commands that control the operation of the meter ON LINE OFF LINE command format C OL x CR LF 0 or 1 0 off line 1 on line Command code on line or off line operation Header _W Switching between on line and off line When the meter is switched from off line to on line the status of the meter is the same as when a command has been received LOCK is displayed Dissolved Oxygen Measurement mode designation command format C DO CRI LF ommand code Dissolved Oxygen Measurement mode designation Header This command is always valid when on line OThe meter enters the Dissolved Oxygen Instantaneous Value display 56 HORIBA 4 RS 232C communica
48. ompletely Preparing span standard solution Put de ionized water into a container and create an oxygen saturated state by bubbling the water with an air pump Calibration procedure 1 Press the CAL key with the initial screeen displayed to select the Calibration mode 2 Press the MODE key to display SoL DO T oo HORIBA 2 Taking Measurements 2 5 Dissolved oxygen DO measurement 3 Wash the electrode with tap water and then immerse it in the standard solution Standard solution Teg Thar sample at a constant speed 1000 1500 rpm during measurement using magnetic stirrer When the sample temperature rises due to the stirrer use a temperature bath With field use electrodes measure at a constant flow speed about 30 cm in 2 seconds 4 Press the CAL key HOLD will blink until the reading stabilizes While HOLD is blinking To cancel calibration Clear the hold by pressing the CAL key again To fix the calibration value Fix the value using the ENTER key After the readout value stabilizes the HOLD is displayed to indicate that the calibration is completed When the span standard solution is used DPRr ri ui When the zero standard solution is used OM 51 27 2 Taking Measurements 2 5 Dissolved oxygen DO measurement 28 _ ___ Zero standard solution and span standard solution are detected automatically 5 To conduct the second cal
49. or is produced Potential 5 digit Temperature 5 digit including decimal point 10 0 to 100 0 Right aligned with blank digits filled with spaces Temperature setting 1 digit O ATC 1 MTC Unit 1 digit 0 none Supplementary unit 1 digit 0 none 1 u 2 m OM 51 63 4 RS 232C communications 4 4 Data request commands and responses Request command for number of stored data items and its response Request command format R MC CR LF Command data Header Meter response format RMC xxx CR LF Number of data items Header 64 HORIBA 4 RS 232C communications 4 4 Data request commands and responses Request command for memory data and its response Request command format R MS yyy CR LF ah ede Memory No Command code Header OM 51 65 4 RS 232C communications 4 4 Data request commands and responses Meter response format RMS xxx y Z2zzz Sample ID 0 Manual data IN 1 Auto data IN Memory No Header X X X X X MMMM XX XX NX XK XK KKXXKX as me ana a Measurement value 6 digit Seconds 2 digit 0 59 Minutes 2 digit 0 59 Hours 2 digit 0 23 ay 2 digit 01 31 Month 2 digit 01 12 Year 4 digit A D lead zero is suppressed SP Measurement status 1 digit 0 Instantaneous value 1 Hold 2 Potential hunt in progress Measurement calibration type 1 digit 0 Measurement Channel number 1 digit 0 1CH Measurement mode 1 d
50. other aquatic animals The measurement of DO is also essential for waste water treatment and water quality management The principles of measurement using a DO tip are explained below Electrode Anode lead Alkaline electrolyte Cathode silver Gas permeable membrane Fig 1 DO tip measurement A precious metal silver is used as the cathode which is tightly affixed to an oxygen permeable membrane and a base metal lead is used as the anode Both the cathode and anode are immersed in an alkaline electrolytic solution The external circuit between the anode and cathode is closed Oxygen that diffuses through the oxygen permeable membrane causes the following chain reaction to occur in the cathode and allows current to flow in the external circuit 0 2H 0 4e gt 40H whereas the following oxidation reaction occurs at the anode 2Pb gt 2Pb 4e This current is proportional to the amount of oxygen that is diffused through the oxygen permeable membrane so measuring the current of the sample enables the DO contained within the sample to be determined HORIBA 7 Reference 7 1 Dissolved oxygen measurement The DO measurement method that is based on this principle is called the Membrane electrode method This is a much simpler and more convenient way of measuring DO than using chemical analysis which requires complex pretreatment in order to eliminate the effects of reductants and oxidants in the sample Salini
51. preparation Refer to the electrode instruction manual and make sure you have the correct electrode Chemical solution Highly concentrated potassium hydroxide KOH is used in the internal solution of the electrode If the internal A solution in the electrode comes in contact with your hands or skin wash Caution immediately with water If the internal solution comes in contact with your eyes flush immediately with large amounts of water and seek treatment by a physician E When storing the electrode with the tip removed the tip packaging and short socket are required so do not throw them away when unpacking the electrode Entering DO Measurement mode 1 Press the MODE key while the measurement screen is displayed The DO Instantaneous Value Measurement screen will appear 20 HORIBA 2 Taking Measurements lissolved oxygen DO measurement Air calibration OM 51 To achieve correct measurements the DO meter must be calibrated prior to taking measurements with it The OM 51 DO meter can be calibrated using a simple one point air calibration and when highly precise measurement is required using a two point standard solution calibration This section explains the general air calibration If a higher level of precision is required refer to Calibrating with standard solution page 26 teg m measurement precision it is necessary to correct for air pressure Air pressure correction
52. re to align the connector grooves with the pins in the connector port on the main unit see photo Do not push the electrode with undue force when the pins are not properly aligned r ing _ wD Do not perform this step with wet or uncleaned hands 2 Push the electrode connector into the connector port while turning it clockwise following the grooves see photo and 10 HORIBA 1 Overview of the Meter 1 6 Connecting the electrodes 3 Push the connector cover over the connector see photo being careful to push it straight on without turning it B O The meter will be waterproof only if this cover is placed properly over the connector Temperature connector OM 51 1 Insert the temperature connector into the jack on the main unit until the O ring on the electrode cannot be seen at all see photo _ Ww The meter will not be waterproof if the electrode is not inserted properly We When the temperature electrode is not connected or is connected improperly the automatic temperature compensation ATC will be 25 C 11 1 Overview of the Meter 1 7 Inserting replacing the dry cell batteries 1 7 Inserting replacing the dry cell batteries 12 The dry cell batteries are not placed in the meter before shipping To insert the batteries follow the procedure below Note that if ERR 2 appears on the display while using the meter it indicates that the charge of the
53. rformed Ae copie When an error has ELECTRODE CHECK occurred DO standard solution calibration 2083 1 9 4333 es pO 12ng L When calibration CAL AC 25 44CALIBRATION OK is performed 2003 17 9 4 38 CAL ERROR S 35 OC When an error 4KELECTRODE CHECK has occurred 5 4 5 Test printing format in the Maintenance mode HERA Oat Bled 456 893 lt gt 7RARCOE EG HI JKL MNOPORSTUNWIKY l _ abcdefahijklano par stuvuxuzd i 76 HORIBA 6 OM 51 6 Maintenance and Troubleshooting Maintenance and Troubleshooting This chapter explains how to perform daily meter maintenance and how to deal with error messages Daily maintenance is vital in assuring accurate measurement and preventing breakdowns before they occur Maintenance of the electrodes is especially important if ignored various problems and erroneous measurements may result This meter is equipped with a convenient error message function If an error message is displayed be sure to take appropriate action T7 6 Maintenance and Troubleshooting 6 1 Dissolved oxygen electrode maintenance 6 1 Dissolved oxygen electrode maintenance Refer to the electrode operation manuals for how to maintain each electrode 6 1 1 Field use electrode Maintenance after daily use 1 Wash the electrode well with tap water 2 Store the DO tip by immersing it in tap water _wWD Leave the electrode connector
54. s wind or rain or close to a heater Do not hold the sensor holder or electrode body with your hand during or soon before after calibration The effects of body temperature will cause the reading to take more time to stabilize To set the calibration value to the initial default settings press the CAL key while holding down the SET key in the CALIBRATION mode Gig eer is being performed in the calibration mode redoing calibration for a standard solution updates the calibrated values for the standard solution only If calibration is redone after returning to the measurement mode however the calibration will be performed in the initial state of the DO meter resulting in clearing all the previous calibration data 23 2 Taking Measurements 2 5 Dissolved oxygen DO measurement Measuring DO Salinity concentration correction is set at 0 0 ppt as the default To change this setting refer to 3 3 6 DO salinity compensation setting page 40 1 Immerse the electrode in the sample _ wD Mix the sample at a constant speed 1000 1500 rpm during measurement using a magnetic stirrer When the sample temperature rises due to the stirrer use a temperature bath With field use electrodes measure at a constant flow speed about 30 cm in 2 seconds 2 Press the MEAS key while the Instantaneous Measurement screen is displayed The measured value will be displayed and HOLD will blink until the
55. ses however the atmospheric pressure caused by the air decreases So 95 7 Reference 7 1 Dissolved oxygen measurement when air is made to saturate water at a high elevation where the air pressure is for example 506 5 hPa which is equal to 1013 hPa x 1 2 the DO will be 4 06 mg L which is equal to 8 11 mg L x 1 2 As explained above careful attention must by paid to atmospheric pressure when calibrating a DO meter Air pressure does not present any special problem when a DO meter is used near sea level but when it is used at especially high altitudes it is necessary to correct for the air pressure The D 55 meter has a built in air pressure correction function Set the atmospheric pressure in the meter when calibrating and the meter will automatically be calibrated using the air pressure corrected value Air pressure correction is calculated using the equation below When calibration is finished the value derived from this equation is displayed Compensated value 1013 P x measured value P is the air pressure hPa set in the meter Saturated DO levels in water at various temperatures with a salinity concentration of 0 00 ppt Saturated Saturated Saturated Saturated Temp Temp Temp Temp BOF ees Wee year eer tae Cl ae mg L mg L mg L mg L 1 13 77 11 10 67 21 8 68 31 7 42 2 13 40 12 10 43 22 8 53 32 7 32 3 13 04 13 10 20 23 8 39 33 7 22
56. ter replacing the batteries Displaying the clock Press the MODE key in the Measurement mode to dis play the clock 2003 3 E i it Dog 32 HORIBA 3 Functions 3 2 Displaying and setting the clock Setting the clock OM 51 1 Press the CAL key when the Clock Display screen is displayed to show the Setting screen for the clock cious o FG Ges i 2 Switch the display to year month day hour minute and second using the ENTER key You can set a numerical value using the A and V keys _ y Set the seconds to 00 sec Pressing the ENTER key sets it to 00 3 After setting the clock press the ENTER key to update the setting Pressing the CAL key at this time returns you to the Clock Display screen without changing the current setting Press the MODE key to return to the Measurement mode 33 3 Functions 3 3 Setting modes 3 3 Setting modes Selecting the Setting mode expands the uses of the meter 3 3 1 Entering the Setting mode 1 Press the SET key in the Measurement mode The Setting Mode Selection cursor appears at the left bottom of the screen to indicate that the Setting mode is active Display Setting Mode Selection cursor Setting mode i d BO pagal w items 2 Pressing the SET key moves the Setting Mode Selection cursor one by one to allow you to select the Setting mode of your choice Setting Mode Selection 3
57. the pH concentration or temperature change Press the MEAS key again while HOLD is either brinking or steadily lit in the display to measure the sample using instantaneous value measurement The electrode is dirty Wash the electrode The electrode is cracked Replace the electrode The responsive glass membrane of the electrode has been dry fora long time Soak the membrane on the electrode in pure de ionized water for 24 hours The temperature of the sample solution is fluctuating Measure after the sample solution temperature stabilizes 84 HORIBA 6 Maintenance and Troubleshooting 6 2 Troubleshooting ERR No 05 Electrode sensitivity error DO OM 51 Explanation If there was something wrong with the DO calibration re calibrate after taking the appropriate measures listed below Cause How to solve problem The settings Reconfirm each setting temperature temperature correction of salinity correction of concentration and air pressure salinity correction concentration or air pressure correction are wrong There is liquid on the DO tip membrane when conducting air calibration Let the electrode sit until the liquid evaporates or remove the liquid using soft tissue paper making sure not to scratch the membrane There is something wrong with the standard solution when conducting standard solution calibration
58. tions 4 3 On line operation commands Saturated Oxygen Measurement mode designation command format C SR CRI LF ommand code Saturated Oxygen Measurement mode designation Header O This command is always valid when on line i1The meter enters the Saturated Oxygen Instantaneous Value display Oxygen Measurement mode designation command format C O2 x CRI LF Channel number 1 or 2 ommand code Oxygen Measurement mode des ignation Header This command is always valid when on line The meter enters the Oxygen Instantaneous Value display Start measurement command format C MS x CR LF hannel number 1 Command code Start measurement Header When the meter status is Instantaneous Measurement Auto Hold Measurement will start If the command is issued during a measurement hold or during calibration the meter will return to the initial screeen status OM 51 57 4 RS 232C communications 4 3 On line operation commands Halt potential hunting command format C BR x CR LF Channel number 1 Command code Measurement halt Header This command is valid when on line only during measurement on AUTO HOLD O Issuing this command halts measurement on AUTO HOLD Start DO calibration command format Cc CA y CR LF Galibration method to be set one digit 0 Air calibration 1 Standard solution calibration Command code DO calibration start Header This comm
59. ty concentration correction When a solution is in contact with air and is in a state of perfect equilibrium a state of saturation the relationship between the DO contained within the solution C expressed in mg L and the partial pressure of the oxygen in the air Ps expressed in Mpa is shown by the following equation C Ps H The H expressed as MPa mg L in this equation is referred to as the Henry constant and has a different value depending on the composition of the solution Generally the higher the salinity concentration within a solution the larger H becomes and consequently the smaller C becomes DO tips actually detect the Ps that occurs in the above equation This means that even if a DO tip is immersed in pure water that is saturated with air or in an aqueous solution containing salt the output current will not change which gives rise to a problem For this reason it is necessary to correct the salinity concentration to enable the correct DO to maintain a current even in an aqueous solution containing salt and resolve the problem Air pressure correction OM 51 The amount of DO in a solution is proportional to the partial pressure of the oxygen contained within the air in which the solution is in contact At 25 C for example when water is saturated by air that has an atmospheric pressure of 1013 hPa 1 atmosphere the DO is 8 11 mg L As the elevation at which measurement takes place increa
60. use a hair dryer for drying the meter When the meter is dropped into water or get wet wipe it using soft cloth ePerform the key operation by the fingers not by the hard object like metal stick or rod eBe careful not to let water into the meter when the electrode connector is empty or the AC adapter or serial communications cable has been connected In those states the meter is not water proof e To disconnect the electrode cable or interface cable pull them out with holding the connector part Do not pull the cable part it may cause a breakage eDo not remove the battery gasket or twist it eWhen opening the battery case make sure that no foreign matter is attached to the battery gasket eDo not use any unspecified batteries it may cause a breakage Location of use and storage e The place which room temperature is at 0 C to 45 C e The place which relative humidity is under 80 and free from condensation Do not use or store the meter at e The place of much dust e The place with strong vibration e The place with direct sunlight e The place with corrosive gas generation e The place near from an air conditioner e The place with direct wind Move and Transportation of the meter To transport the meter use the packaging box at the delivery Transportation by any unspecified packing methods may cause a breakage Disposal Standard solution used for the calibration must be under neutralization before the disposal As
61. y error within three minutes 05 Electrode The electrode sensitivity is out of the sensitivity error standard 09 Printer error There is a problem with the printer 10 Data memory The number of data items has over exceeded the limit of the memory 82 HORIBA 6 Maintenance and Troubleshooting 6 2 Troubleshooting ERR No 01 Memory error Explanation Data cannot be read from or written to the internal memory Cause How to solve problem The DO meter __ Take the battery from the DO meter does not start and disconnect the AC adapter operating cor Then press the ON OFF key for rectly even after about 10 seconds the power is turned ON The internal IC Seek repairs at your nearest retail is defective outlet or HORIBA service station ERR No 02 Battery voltage low Explanation The battery has insufficient voltage Cause How to solve problem The battery Replace the dry cell battery voltage is low Battery voltage 2 2V or less _ Ww The measured value cannot be guaranteed when ERR No 02 is displayed OM 51 83 6 Maintenance and Troubleshooting 6 2 Troubleshooting ERR No 03 Electrode stability error Explanation The electric potential did not stabilize within three minutes Cause How to solve problem This is caused by the sample solution when the sample solution is pure water or another solution with low conductivity or

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