Mi190 - Milwaukee Instruments
Contents
1. 11 Secondary LCD 12 Primary LCD REAR PANEL 13 USB connector 14 RS232 connector 15 Power supply socket 16 DIN connector for probe S EE GENERAL DESCRIPTION Thank you for choosing Martini Instruments This instruction manual will provide you the necessary information for correct use of the meter Mi 190 is is a logging microprocessor based DO and Temperature bench meter Dissolved Oxygen is indicated in ppm parts per million or in All measurements are automatically compensated for temperature Salinity compensation in water allows direct determination of Dissolved Oxygen in saline waters and altitude compensation readjusts for the altitude variance The Dissolved Oxygen probe has a membrane covering the polarographic sensors and a built in thermistor for temperature measurements and compensation This permeable membrane isolates the sensor elements from the testing solution but allows Oxygen to pass through When a voltage is applied across the sensor oxygen that has passed through the membrane reacts causing a current flow and hence determin ing a reading This Bench Meter is supplied with e MA 840 2 DO probe e MA 841 membrane cap e MA 9071 electrolyte solution e MA 9315 Electrode Holder e Mi 5200 Application Software e MA 9350 RS232 Connector cable D meters e 12 VDC Adapter e Instruction Manual www milwaukeeinst com Instruc2. og e The altitude factor CALIBRATION a L3 Kl L3 L 3 e When the reading is stable READY amp ACCEPT tags start blinking Press ACCEPT to confirm the 0 0 D O calibration o F m Kar LoG Co 1 TI LL e The dEL message on the primary LCD and the record number on the secondary GG x LCD along with ACCEPT tag blinking nn au D IL e Ifthe reading is within the limits 15 f s the meter stores the value and adjusts the zero UEL point e Press CAL The instrument will return to measurement mode and will memorize the cf zero calibration data For a two point calibration do not press CAL and follow the Lee n procedure below Notes elf one of the arrow keys is pressed while dEL message is displayed the next previous record number will be selected e f the SETUP key is pressed the secondary LCD will toggle between the record number and ALL message e Press the ACCEPT key to delete the selected or all records elf dEL ALL option was selected all records for the selected range are deleted and the instrument returns to measurement mode e After deleting a record the nuLL message is displayed on the LCD for the selected record Press the MR key to leave RECALL mode at any time Instruction Manual Mi 190 DO Bench Meter Pressing the arrow keys the instrument will display the same parameter but for a different re
3. L RER in 7 65 CO CO Note The relationship between salinity and chlorinity for sea water is given by the equation below Salinity g l 1 80655 Chlorinity g l www milwaukeeinst com Before proceeding with the calibration make sure the probe is ready for measurements see page 7 i e the membrane cap is filled with electrolyte and the probe is connected to the meter and properly polarized For an accurate calibration it is recommended to wait at least 15 minutes to ensure precise conditioning of the probe eep the protective cap on during polarization time and remove it for calibration and measurements Follow the calibration procedure see page 10 SALINITY AND ALTITUDE COMPENSATION If the sample contains significant concentration of salinity or if you are performing measure ments at an altitude different from sea level the read out values must be corrected taking into account the lower degree of oxygen solubility in these situations see pages 20 21 Remember to set the altitude and or the salinity before taking any D O measurements The meter will automatically compensate for these factors D O MEASUREMENTS Make sure that the instrument has been calibrated and the protective cap has been removed e Immerse the tip of the probe in the sample to be tested Allow approximately one minute for the reading to stabilize e The Dissolved Oxygen value in is displayed on the primary LCD
4. the meter will display MEASURE PROBE POLARIZATION The probe is under polarization with a fixed voltage of approximately 800 mV Probe polarization is essential for stable measurements with the same recurring degree of accuracy With the probe properly polarized oxygen is continually consumed when it passes through the sensitive diaphragm and dissolves in the electrolyte solution contained in the probe If polarization is interrupted the electrolyte solution continues to be enriched with oxygen until it reaches an equilibrium with the surrounding solution Whenever measurements are taken with a non polarized probe the oxygen level revealed is both that of the tested solution as well as that present in the electrolyte solution This reading is incorrect The calibration of this instrument is very simple www milwaukeeinst com Altitude eters above Sea Level 13 3 1f 12 6 HK 2 Er z Ea H E 2 a Instruction Manual Mi 190 DO Bench Meter The salinity affects the D O concentration decreasing its value The table below shows the maximum oxygen solubility at various temperatures and salinity levels 0 g l 10 g l 20 g l 4 60 3 64 12 74 11 90 J 1150 3 8 1 2 91 12 07 1 83 1 09 10 40 5 9 68 9 28 Ai 23 7 93 Pane Ka CO 6 75 6 o REES e e 5 63 5 48 5 33 5 20 5 07 an w gt EINTE ira on RES EE EE EEE on EE E CO Ee Ee CC 7 36 ant
5. 9071 for 5 minutes black 3 Rinse the membrane cap MA 841 supplied in the kit with the meter with electrolyte solution while shaking it red gently Refill with clean electrolyte solution 4 Tap gently the sides of the membrane cap with your finger tip to ensure that no air bubbles are trapped To AT avoid damaging the membrane do not tap it directly on the bottom d 5 Make sure that the rubber O ring sits properly inside the membrane cap FILL FIRST Y 6 With the sensor facing down slowly screw the cap clockwise Some electrolyte will overflow THEN mei When not in use and during polarization see page 8 use the protective transparent cap supplied in the kit with the meter THEN SCREW BACK ON TEL Instruction Manual Mi 190 DO Bench Meter OPERATIONAL GUIDE INITIAL PREPARATION Plug the 12 VDC adapter into the power supply socket Connect the DO probe to the 7 pin connector Make sure the probe sleeve is properly inserted and tighten the threaded ring Turn the instrument on by pressing ON OFF All LCD tags are displayed and a beep is heard while the instrument performs a self test e After a few seconds Cond message appears on the LCD to inform the user that the probe is in auto conditioning automatic polarization mode le RRR Loser e When this message disappears the probe is polarized and the instrument can be calibrated D e Ifthe probe is disconnected
6. D SETUP LOG MODE LU D E REQUIRE USER CONFIRMATION Ae DATE F CALIBRATION MODE gage H G SECONDARY DISPLAY D LL SETUPLOG ACCEPT CALIBRATION H TEMPERATURE UNIT 1 CALIBRATION WRONG MESSAGE www milwaukeeinst com For your Safety don t use or store the instrument in hazardous environments To avoid damages or burns do not perform any measurement in microwave ovens WARRANTY This instrument is warranted against defects in materials and manufacturing for a period of 3 years from the date of purchase Electrodes are warranted for 6 months If during this period the repair or replacement of parts is required where the damage is not due to negligence or erroneous operation by the user please return the intrument electrode and probe to either distributor or our office and the repair will be effected free of charge Damage due to accidents misuse tampering or lack of prescribed maintenance is not covered by the warranty Milwaukee Martini instruments reserves the right to make improve ments in design construction and appearance of its products without advance notice Instru ction Manual Mi 190 DO Bench Meter TROUBLESHOOTING SYMPTOMS PROBLEM SOLUTION Reading fluctuates up and DO probe not properly Insert the probe down noise connected Display shows DO reading Reading out of range Recalibrate the meter blinking Check the sample is within measurable range Meter fails to calibrate or B
7. automatic buffer recognition function If the ARROW keys are pressed to select the desired calibration value the automatic buffer recognition function is disabled Instruction Manual Mi 190 DO Bench Meter LOGGING Up to 50 LOG samples can be stored into memory LOGGING THE CURRENT DATA To store the current reading into memory press the LOG key while in measurement mode The instrument will display the current date MM DD on the primary LCD and the record number on the secondary LCD along with LOG tag see example below record No 25 dated June 29 The instrument displays then th returns to normal measuremen Me IT Lowe I DATE 23 e amount of free log space for about one second and mode e g 18 records free ECE IILL If there are less than 6 memory locations remaining the record number and Lo message will blink to alert the user S S VI Gm LI 7 LI www milwaukeeinst com If the log space is full FULL LOC message will be displayed and no more data will be saved When the LOG key is pressed while in measurement mode a complete set of informa tion is stored VIEW LOGGED DATA Press the MR key to retrieve the information stored while in measurement mode If no data were logged the instrument displays no rEC message for the selected range Otherwise the instrument will display the DO value on the primary LCD
8. to polish and remove any stains without damaging the platinum tip Afterwards rinse the probe with deionized or distilled water and install a new mem brane cap using fresh electrolyte and follow the steps above UNSCREW fig 2 Recalibrate the instrument Instruction Manual Mi 190 DO Bench Meter lt ETX gt is 03 ASCII code character end of text lt answer gt lt ACK gt is sent for a recognized command lt CAN gt is sent when the instrument is logging lt Err6 gt lt Err8 gt is sent when the command is incorrect or the instrument is not in measurement mode COMMANDS REQUIRING AN ANSWER The instrument will answer for these commands with lt STX gt lt answer gt lt checksum gt lt ETX gt where the checksum is the bytes sum of the answer string sent as 2 ASCII characters All the answer messages are with ASCII characters RDO MDL INF SAM LDDO LADO Notes e Err8 e Err e Era e Err3 Causes the instrument to send a complete set of readings in according with the DO range Requests the instrument model name and firmware code 16 ASCII chars Requests the setup parameters Requests the number of logged samples 4 chars xxx Requests the xxx DO record logged data Requests all DO Log on demand is sent if the instrument is not in measurement mode is sent if the requested range is not available is sent if the requested set parameter is not available is sent if the Log on d
9. THANK YOU FOR CHOOSING MARTINI instruments Sales and Technical Service Contacts Milwaukee Electronics Kft Als kik t sor 11 6726 Szeged Hungary Tel 36 62 428 050 Fax 36 62 428 05 e mail sales milwaukeeinst com Milwaukee Instruments Inc 2950 Business Park Drive Rocky Mount NC 27804 USA Tel 1 252 443 3630 Fax 1 252 443 1937 e mail sales milwaukeetesters com www milwaukeeinst com MANMI190R1_ 10 05 Bench Meter S o E Mi 190 DO Temperature www milwaukeeinst com Instruction Manual Mi 190 DO Bench Meter FUNCTIONAL DESCRIPTION tee cass Gury deene eet Eege eege 2 GENERAL DESCRIPTION SIN le UE 5 PROBE FUNCTIONAL DESCRIPTION egene sett dee 6 PROBE CONNECTION AND PREPARATION nal Ee Te KEREN 8 SAUNTTYANDAUTTTUDECOMDENSATIOH 9 D O MEASUREMENTS ao TEMPERATURE MEASUREMENTS c secceeseesssessessessessecsessecucenscussucsussessesueenesueeueenscusssensaesaeeaeenceneensens 10 D O CALIBRATION e E E E INITIAL PREPARATION ZERO CALIBRATION E E E E ars bariseresduotshaductetescusrtera aaiutinedis SLOPE CALIBRATIOIN eege LOGGING SST TEMPERATURE CALIBRATION fortechnical personnel on 22 PC INTERFACE PROBE MAINTENANCE scsssistssvesocece enceecaees ee Eeer 25 TROUBLE 26 Ee Eed 26 FUNCTIONAL DESCRIPTION DISPLAY A PRIMARY DISPLAY B MEASURING UNIT FOR PRIMARY SH DISPLAY READY DI EL TI C CALIBRATION MESSAGES Pam Pan ee
10. and the tempera ture on the secondary LCD along with last stored record number and LOG tag
11. and the temperature on the secondary LCD CO JUL 7 MEASURE cou Instruction Manual Mi 190 DO Bench Meter e Press RANGE to change the reading from to ppm and vice versa 45 Lin of MEASURE cou For accurate Dissolved Oxygen measurements a water movement of 0 3 m s is required This is to ensure that the oxygen depleted membrane surface is constantly replenished A moving stream will provide adequate circulation The use of a magnetic stirrer to ensure a certain fluid velocity is recommended TEMPERATURE MEASUREMENTS The probe has a built in temperature sensor The measured temperature is indicated on the secondary LCD as shown above Allow the probe to reach thermal equilibrium before taking any measurement This can take several minutes The greater the difference between the temperature at which the probe was stored and the temperature of the sample the longer the time will be Note If is displayed the D O probe is not properly connected or the temperature is out of range This also indicates the posibility of a broken probe cable www milwaukeeinst com Press the arrow keys to change the displayed value Press the ACCEPT key to accept the value or the CAL key to escape Press the arrow keys to select the next previous parameter Press the SETUP key to exit SETUP menu at any time The following table lists the SETUP parameters their valid values range and the factor
12. cord Op b LOG Press the RANGE key and the instrument will display the next logged parameter e The date month and day on the primary LCD and the year on the secondary LCD along with DATE tag LIDL DATE cuu5 LOG Me IT e The time hour and minutes on the primary LCD and the seconds on the secondary LCD along with TIME tag www milwaukeeinst com SLOPE CALIBRATION It is suggested to perform the slope calibration in air e Rinse the probe in clean water to remove any residual zero oxygen solution Note If you did not perform the zero calibration procedure press CAL and then the ARROW keys to select the 100 D O calibration point e Dry the probe tip and allow a few seconds for the LCD reading to stabilize The WAIT tag will blink until the reading is stable Ki Be Foc l ILI mnr JUHU e When the reading is stable READY amp ACCEPT tags start blinking Press ACCEPT to confirm the 100 0 D O calibration EE READY p Gm Gm HUE em a e Fe BUFFER Malala DD BEEN ACCEPT CALIBRATION SE e If the reading is within the limits 15 f s the meter stores the value and adjusts the slope point e The instrument stores the slope calibration data and returns to measurement mode Note If the reading is not close to the selected value WRONG amp BUFFER tags will blink e MI 190 has
13. curacy is required The instrument can be calibrated in maximum 2 points 0 0 zero calibration and 100 0 slope calibration The zero calibration of the Mi 190 is very stable therefore this procedure needs to be performed only whenever the probe or the membrane is replaced However because the slope calibration is more critical it is recommended to perform this procedure every week INITIAL PREPARATION p S e Pour small quantities of MA 9070 Zero Oxygen solution into a di beaker If possible use a plastic beaker to minimize any EMC interfer A ences e Make sure the probe is ready for measurements see probe prepara tion on page 7 i e the membrane is filled with electrolyte and the probe is connected to the meter ANT e Switch the meter on by pressing the ON OFF switch _ e Foran accurate calibration it is recommended to wait for at least D 15 minutes to ensure precise conditioning of the probe e Remove the protective cap from the D O probe e Set the appropriate altitude factor see page 21 Make sure the salinity factor is set to zero see page 20 ZERO CALIBRATION e Submerge the probe into MA 9070 zero oxygen solution and stir gently for 2 3 minutes Instruction Manual Mi 190 DO Bench Meter www milwaukeeinst com e The salinity factor e Press CAL The WAIT tag will blink on the LCD until the reading is a stable Rares Ewart Zone i pe l SALE N
14. e and close to he selected calibration point the READY and ACCEPT tags will blink e Press the ACCEPT key to accept the calibration point The secondary LCD will show 50 0 C e Immerse the temperature probe in the second vessel as near as possible to the reference hermometer Allow a few seconds for the probe to stabilize e Use the UP and DOWN arrow keys to set the reading on the secondary LCD to that of the hot water measured by the reference thermometer e When the reading is stable and close to the selected calibration point the READY and ACCEPT tags will blink e Press the ACCEPT key to accept the calibration point The instrument returns to measurement mode Note If the reading is not close to the selected calibration point WRONG tag will blink Change the temperature probe and restart calibration www milwaukeeinst com PROBE CONNECTION AND PREPARATION To take measurements connect the D O probe to the meter securely by aligning the pins with the socket located on the back of the meter pushing the plug in and tightening the threaded ring Probes shipped from Martini Instruments are dry To hydrate the probe and prepare it for use connect it to the meter and proceed as follows Shipping 1 Remove the red and black plastic cap This cap is for cap shipping purposes and can be thrown away 2 Wet the sensor by soaking the bottom 21 2 cm 1 of the probe in electrolyte MA
15. emand is empty e Invalid commands will be ignored www milwaukeeinst com SPECIFICATIONS Range DO 0 00 to 45 00 ppm O 0 0 to 300 0 O Temp 5 0 to 55 0 C 23 0 to 131 0 F Resolution DO 0 01 ppm 0 1 Temp 0 1 C 0 1 F Acoeo DO l5 offlsae itsti C O s itw S kabel Temp 0 4 C 0 8 F Calibration DO single or double point at 0 MI 9070 and 100 in air Temp 2 point at O and 50 C 32 0 and 122 0 F Altitude Compensation O to 4 000 m 13 120 Resolution 100 m 328 Salinity Compensation O to 40 g l Resolution 1 g l Temperature Automatic from 0 0 to 50 0 C 32 0 to 122 0 F Compensation Probe MA 840 2 Computer Interface RS232 USB opto isolated Power supply 12 VDC power adapter Dimensions 230 x 160 x 95 mm 9 0 x 6 3 x 3 7 Weight 0 9 kg 2 0 lb Environment O to 50 C 32 to 122 F max RH 95 Warranty 3 years This instrument is in compliance with CE Directives Instruction Manual Mi 190 DO Bench Meter www milwaukeeinst com PROBE FUNCTIONAL DESCRIPTION PCINTERFACE Data transmission from the instrument to the PC can be done with the Mi 5200 Windows compatible software when using the RS232 or USB serial interface Mi 5200 also offers graphing and on line help feature Data can be exported to the most popular spreadsheet programs for further analysis To connect the instrument to a PC through the RS232 port use the Marti
16. ni MA 9350 cable connector To connect the instrument to a PC through the USB port use a standard USB cable Make sure that your instrument is switched off and plug one connector of the cable to the instrument RS232 USB connector and the other to the serial port of your PC Notes e Other cables than MA 9350 may use a different configuration In this case communication between instrument and PC may not be possible Keep only one cable connected RS232 or USB during PC communication to avoid possible errors sf you are not using Martini Instruments Mi 5200 software please see the following instructions SENDING COMMANDS FROM PC It is also possible to remotely control the instrument with any terminal program Use MA 9350 cable to connect the instrument to a PC start the terminal program and set the communica tion options as follows 8 N 1 no flow control COMMAND TYPES To send a command to the instrument follow the next scheme D O Probe lt gt lt command gt lt CR gt e a SCH Protective Cap where lt gt is the command prefix Watertight Shielded Cable lt command gt is the command code Polypropylene Probe Body Note Either small or capital letters can be used Temperature Sensor 2 3 4 S O Ring Seal UNIT CHANGE COMMAND Z 8 S Silver Chloride Anode CHU xx Change the instrument unit according with the parameter value xx Platinum Cathode sensor The inst
17. roken DO probe Replace the probe gives faulty readings At startup the meter displays One of the keys is blocked Check the keyboard or all LCD tags permanently contact your dealer Err vi message displayed at Intemal error Cortact your dealer or any start up Martini Instruments Service Certer ACCESSORIES MA 9070 Zero Oxygen Solution 230 ml MA 9071 Refilling Electrolyte Solution 30 ml MA 9311 115VAC to 12VDC converter MA 9310 230VAC to 12VDC converter MA 840 2 Spare probe with 2 meters 6 7 cable MA 840 10 Spare probe with 10 meters 33 cable MA 840 20 Spare probe with 20 meters 67 cable MA 841 MA 5200 MA 9350 5 spare membranes Windows compatible software application 9 pin PC connection cable www milwaukeeinst com FUNCTIONAL DESCRIPTION FRONT PANEL Liquid Crystal Display LCD CAL key to enter exit calibration mode MR key to enter exit recall mode MARTIN instruments ACCEPT key to confirm value LOG key to store reading in memory Ett Bor NS SETUP key to enter exit setup mode or o toggle between delete one and all ogged data 12 7 V key to select SETUP item or to de crease parameter value 8 RANGE key to select measurement unit switch focused data 9 A key to select SETUP item or to at increase parameter value 10 ON OFF key to turn the meter ON and OFF
18. rument will answer for this command with Oxygen Permeable Membrane lt STX gt lt answer gt lt ETX gt 0 Membrane Cap where lt STX gt is 02 ASCII code character start of text Instruction Manual Mi 190 DO Bench Meter TEMPERATURE CALIBRATION for technical personnel only The Mi 190 is factory calibrated for temperature Martini s DO probes are interchangeable and no temperature calibration is needed when they are replaced If the temperature measurements are inaccurate temperature recalibration should be performed For an accurate recalibration contact your dealer or the nearest Martini Customer Service Center or follow the instructions bellow e Prepare a vessel containing ice and water and another one containing hot water at a emperature of around 50 C Place insulation material around the vessels to minimize emperature changes e Use a calibrated thermometer with a resolution of 0 1 C as a reference thermometer e With the instrument off press and hold down the LOG A MR keys then power on the instrument The CALIBRATION tag will appear and the secondary LCD will show 0 0 C e Immerse the temperature probe in the vessel with ice and water as near as possible to the reference thermometer Allow a few seconds for the probe to stabilize e Use the UP and DOWN arrow keys to set the reading on the secondary LCD to that of ice and water measured by the reference thermometer When the reading is stabl
19. tion Manual Mi 190 DO Bench Meter PROBE MAINTENANCE The oxygen probe body is made of reinforced plastic for maximum durability A thermistor temperature sensor provides temperature measurements of the sample Use the protective probe cap when not in use To replace the membrane or refill with electrolyte proceed as follows e Remove the protective cap by gently twisting and pulling it off the body of the probe see fig 1 e Unscrew the membrane cap by turning it counterclockwise TWIST see fig 2 AND e Wet the sensor by soaking the bottom 2 2 cm 1 of the PULL probe in electrolyte MA 9071 for 5 minutes fig 1 e Rinse the new membrane cap MA 841 supplied with the meter with electrolyte solution while shaking it gently Refill with clean electrolyte solution e Gently tap the sides of the membrane cap with your finger tip to ensure that no air bubbles remain trapped Do not tap directly the bottom with your finger as this will damage the membrane e Make sure that the rubber O ring sits properly inside the membrane cap e With the sensor facing down slowly screw the mem brane cap clockwise Some electrolyte will overflow The Platinum cathode 8 in the Probe Functional Description page 6 should always be bright and untarnished If it is tarnished or stained the cathode should be cleaned You can use a clean lint free cardboard or cloth Rub the cathode very gently side to side 4 5 times This will be enough
20. y settings default Item Description Valid values Default SALt Salinity Factor 0 to 40 g l 0 ALt Altitude Factor O to 4000 m step100 m 0 TIME Time hh mm 00 00 to 23 59 00 00 DATE Date MM DD YYYY 01 01 2000 12 31 2099 01 01 2005 bEEP Beep Status ON OFF OFF bAud Baud Rate 600 1200 2400 4800 9600 2400 In Id Instrument ID 0000 to 9999 0000 tEMP Temperature Unit C or F C Instruction Manual Mi 190 DO Bench Meter SETUP Setup mode allows viewing and modifying the following parameters e Salinity Compensation e Altitude Compensation e Current Time hh mm e Current Date MM DD YYYY e Beep Status e Baud Rate serial communication e Instrument ID e Temperature Unit To enter SETUP mode press and hold the SETUP key for about 1 second while in normal measurement mode Select the desired setup parameter using the UP and DOWN arrow keys Press the CAL key if you want to change the item value The selected item e g hour in setting up the correct time and ACCEPT tag will start blinking Press the arrow keys to change the displayed value H SM Al Op LL D Ge TIME BEER SETUP ACCEPT EARS If there is another item to be set e g minutes press the RANGE key The other item will start blinking alee SETUP SACCEPT PAS www milwaukeeinst com D O CALIBRATION Calibrate the instrument frequently especially if high ac
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