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1. 0006 8733 VOM Pac Ete ooi teorie eei boxer ectetur EET 0024 1310 Protective Rubber Boot w Magnet M j 0024 1127 Instruction 0019 9337 21 Oxor LT 6 3 Service Centers Replacement parts and service can be obtained by contacting one of the fol lowing Bacharach Service Centers United States Bacharach Inc 621 Hunt Valley Circle New Kensington PA 15068 Phone 724 334 5051 Fax 724 334 5723 Email help mybacharach com Canada Bacharach of Canada Inc 20 Amber St Unit 7 Markham Ontario L3R SP4 Canada Phone 905 470 8985 Fax 905 470 8963 Email bachcan idirect com 22 Instruction 0019 9337 Oxor LT Notes Instruction 0019 9337 23 4BACHARACH World Headquarters 621 Hunt Valley Circle New Kensington PA 15068 Ph 724 334 5000 Fax 724 334 5001 Toll Free 800 736 4666 Website www mybacharach com E mail help mybacharach com Printed in U S A 9001 2008
2. B The Measurable Difference FARASI Qor III Oxygen Analyzer Operation amp Maintenance Instruction 0019 9337 Rev 2 May 2010 aea AMBIENT 1 13 oF 20 3 Era gt er Con Y Ce Product Leadership Training Service Reliability WARRANTY Bacharach Inc warrants to Buyer that at the time of delivery this Product will be free from defects in material and manufacture and will conform substantially to Bacharach Inc s applicable specifications Bacharach s liability and Buyer s remedy under this warranty are limited to the repair or replacement at Bacharach s option of this Product or parts thereof returned to Seller at the factory of manufacture and shown to Bacharach Inc s reasonable satisfaction to have been defective provided that written notice of the defect shall have been given by Buyer to Bacharach Inc within two 2 years after the date of delivery of this Product by Bacharach Inc Bacharach Inc warrants to Buyer that it will convey good title to this Product Bacharach s liability and Buyer s remedy under this warranty of title are limited to the removal of any title defects or at the election of Bacharach to the replacement of this Product or parts thereof that are defective in title All expendable items such as electromechanical sensors are warranted for a period of one year THE FOREGOING WARRANTIES ARE EXCLUSIVE AND ARE GIVEN AND ACCEPTED IN LIEU OF I ANY AND A
3. Description 0019 8112 Oxor III includes 4 AA batteries probe amp hose assembly with integral filter and a hard carrying case 0019 8113 Oxor III includes 4 AA batteries probe amp hose assembly with integral filter hard carrying case plus an IrDA printer The analyzer detects and displays the presence of O by first drawing in a gas sample from the area being tested by the analyzer s built in motorized pump The gas sample 1s next directed into a sensor chamber where the sample is analyzed for the presence of O A permanent record of the detected O level along with the current time and date can be made by using the optional wireless IrDA printer A backlight enables the operator to read the display in dimly lit areas A power saver feature causes the backlight to automatically turn OFF after 10 minutes and causes the analyzer to shut OFF after 20 minutes of inac tivity Instruction 0019 9337 1 Oxor LT 2 0 TECHNICAL CHARACTERISTICS O Display Range 0 20 996 OJ ACCUTAC Y a oreste estere 0 4 0 8 O O Resolution 0 1 Os Response Time 90 of final value within 30 sec Ambient Temperature Display Range 0 to 100 C 32 to 212 F Ambient Temperature Accuracy 3 C between 0 and 40 C 32 to 104 F Ambient Temperature Resolution 0 1 C 0 1 F Battery Requirement Four d
4. the displayed value and display the O screen or press the I O button to exit the Calibration Mode and turn OFF the analyzer without sav ing the changes 5 3 O Sensor Zero Material Required Cylinder of 100 Nitrogen P N 9550 0049 Calibration Kit P N 0024 7059 Procedure 1 With the analyzer sampling fresh air enter the Calibration Mode as described in Section 5 1 Then repeatedly press the ENTER button until O appears in the lower left side of the display e o LAL 2 Allow the pump to run and sample fresh air for at least 1 minute 3 Use the XX buttons to set the displayed value to 20 9 16 Instruction 0019 9337 Oxor LT 4 Set up the Calibration Kit with 100 No as described in the in structions supplied with the kit 5 Connect the tubing of the Calibration Kit to the GAS inlet of the analyzer then adjust the regulator for approximately 2 SCFH of excess flow see Figure 5 1 6 After the analyzer has stabilized 2 to 3 minutes use the KX but tons to set the displayed value to 0 0 7 Disconnect tubing from analyzer and turn off gas flow 8 Allow the analyzer s pump to run until the O reading returns to 20 9 If necessary use the KX buttons to readjust the reading to 20 9 Repeat steps 3 though 7 to verify the zero adjustment 9 Press ENTER to store the new calibration values and move to the next calibration screen Or hold down ENTER for 2 seconds to store the new calib
5. the range of 0 20 9 and ambient temperatures in the range of 0 100 C 32 to 212 F If the probe 1s being used insert the probe tip into the area to be sampled AMBIENT 88 F O e093 Note Ifa sensor error was detected during warm up the O Sensor Error Screen will be displayed Refer to Section 4 4 Tip An O error will occur when the oxygen sensor s output drops to be tween 80 and 90 Consider replacing the oxygen sensor when its ouput level drops below 100 Instruction 0019 9337 9 Oxor LT Front Panel Button Functions X No effect X No effect HOLD Freezes display and stops pump pressing a second time activates printing ENTER Restarts testing after the HOLD button was pressed LIGHT Toggles backlight ON OFF 1 0 Turns analyzer OFF with a 5 second delay 4 2 Ending a Test After taking a gas sample remove the probe and take the analyzer to an area containing fresh air Allow the pump to run until the O reading is 20 9 O 4 3 Turning OFF the Analyzer Turn OFF the analyzer by pressing the I O button The analyzer will count down from 5 before turning OFF Pressing ENTER however will abort the count down and keep the analyzer ON DEF 5 4 4 O Sensor Error Screen An O sensor error is displayed if the analyzer determines during the warm up cycle that the oxygen sensor s output is too low for it to be usable However in the extreme condition when the O sensor has n
6. 37 Oxor LT 2 Press the X or X button until the desired temperature unit F or C is displayed 3 Press ENTER to move to the next Setup Screen or I O to exit setup 3 4 3 Time Setup There are two Time Setup Screens one for hours and the other for min utes Two bars appear above the segments being changed The clock is in a 24 hour format but will appear as AM PM on the printout 325 1 Enter the Setup Mode per Section 8 4 1 If necessary repeatedly press ENTER until the first Time Setup Screen is displayed the one with two bars over the hour digits 2 Press the X or Xl button until the correct hour value is displayed 3 Press ENTER to move the selection bars over the minute digits 4 Press the X or X button until the correct minute value is displayed 5 Press ENTER to move to the next Setup Screen or I O to exit setup 3 4 4 Date Setup There are two Date Setup Screens each labeled DAtE The first screen sets the month while the second screen sets the day DUREE i cob Instruction 0019 9337 Oxor LT 1 Enter the Setup Mode per Section 3 4 1 If necessary repeatedly press ENTER until the first Date Setup Screen is displayed 2 Press the M or X button until the correct month is displayed 3 Press ENTER to switch to the second Date Setup Screen 4 Press the M or X key until the correct day is displayed 5 Press ENTER to move to the next Setup Screen or I O to exit setup 3 4
7. 5 Year Setup The Year Setup Screen is labeled yEAr JERC 205a 1 Enter the Setup Mode per Section 8 4 1 If necessary repeatedly press ENTER until the Year Setup Screen is displayed 2 Press the N or X button until the correct year 1s displayed 3 Press ENTER to move to the next Setup Screen or I O to exit setup 3 4 6 Selecting Printer Protocol The Printer Setup Screen is labeled Prnt The analyzer can be set up to send data to a wireless printer using either HP or IrDA protocol Prnt Prnt HP ic dH 1 Enter the Setup Mode per Section 3 4 1 If necessary repeatedly press ENTER until the Printer Setup Screen 1s displayed 2 Press the M or X button to select the desired protocol 3 Press ENTER to move to the next Setup Screen or I O to exit setup 8 Instruction 0019 9337 Oxor ILI 3 4 7 Exiting the Setup Screen Press the l O button at any time to exit the Setup Mode and turn the ana lyzer OFF Note that the last displayed parameter is automatically saved in memory 4 0 OPERATION Power the analyzer ON Wait for the unit to warm up Take a gas sample 4 1 Taking a Gas Sample Turn ON the analyzer by pressing the I O button Observe that when power is first applied the software revision level is first displayed followed by a screen that counts down the warm up period The warm up period is 60 seconds Following warm up the Os screen appears This screen directly shows O levels in
8. LL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING WITHOUT LIMITATION THE IM PLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND II ANY OBLIGATION LIABILITY RIGHT CLAIM OR REMEDY IN CONTRACT OR TORT WHETHER OR NOT ARIS ING FROM BACHARACH S NEGLIGENCE ACTUAL OR IMPLIED The remedies of the Buyer shall be limited to those provided herein to the exclusion of any and all other remedies including without limitation incidental or consequential damages No agreement varying or extending the foregoing warranties remedies or this limita tion will be binding upon Bacharach Inc unless in writing signed by a duly authorized officer of Bacharach Register your warranty by visiting www mybacharach com Declaration of Conformity Manufacturer s name Bacharach Inc Manufacturer address 621 Hunt Valley Circle New Kensington PA 15068 Product name Oxor TM III conforms to the following specifications European Directive 89 336 EEC EN50082 1 1997 Electrostatic Discharge EN50082 1 1997 Immunity EN55022 Group 1 Class B Emission Notice Product improvements and enhancements are continuous therefore the specifications and information con tained in this document may change without notice Bacharach Inc shall not be liable for errors contained herein or for incidental or consequential damages in con nection with the furnishing performance or use of this material No part of this document may be phot
9. Run Mode press the HOLD button twice to enter the Print Memory Menu Screens If the analyzer is already in its Hold Mode press the HOLD button only once The first menu item displayed is the Print Screen Pent Press the X or X button until the Open Screen is displayed and then press ENTER to open the memory locations for viewing The number shown in the second screen represents the most recent memory location where data was stored GPEn GPEn 3 Press the X or X button to scroll to the desired memory location and then press ENTER to recall the stored data and return to the Hold Mode While in the Hold Mode the recalled data can be viewed or printed per Section 4 8 Printing Test Data Tip To avoid printing errors it is important to select the correct protocol per Section 3 4 6 before saving data Turn ON the printer Refer to the printer s instruction manual for detailed operation and maintenance information If not already done set the printer parameters as follows Data 8 bits Parity None Baud 9600 Handshaking X on X off 12 Instruction 0019 9337 Oxor LI Align the printer with the top of the analyzer as shown in Figure 4 1 AAA BACHARACH INC 0 DATE 2 01 2008 TIME 2 45 PM O2 20 9 96 COMMENTS Figure 4 1 Printer Alignment amp Sample Printout Print Current Test Data 1 With the analyzer in its Run Mode press the HOLD button
10. d accuracy of the Oxor III Entering the Calibration Mode and Testing the Display Segments With the analyzer turned OFF place the unit in fresh ambient air then press and hold down the ENTER button Press the I O button and release it Observe that all LCD segments are turned ON Release the ENTER button Observe the unit s model number and software version are displayed The word CAL is then displayed while the unit counts down from 60 seconds AR EEN STACK F1F2 ki d a 838 5 Eu 6B WCmB MV V r n P Ha AA LAL 2 EXCESS AIR FREE zi At the end of the count down period the first calibration screen is automatically displayed Note During calibration the KX buttons are used to in crease or decrease a displayed calibration value ENTER is used to store the new value and move to the next screen Exit the Calibration Mode by holding down the ENTER button for 2 seconds Instruction 0019 9337 15 Oxor II 5 2 Ambient Temperature Calibration Material Required Calibrated Thermometer Procedure 1 Enter the Calibrate Mode as described in Section 5 1 Observe that AMBIENT is displayed at the top of the display if not repeatedly press ENTER until it appears 2 Use the XX buttons to adjust the displayed value to match the reading of a calibrated thermometer 3 Press ENTER to store the displayed value and move to the next calibration screen or hold down ENTER for 2 seconds to store
11. g the Backlight eiie kt rot tenete e n e ecrit pe din 11 4 6 Saving Test Data in Memory ui ken 11 4 7 Opening and Viewing Saved Test Data 12 4 8 Printing Test Data c eret orte certe Rosen 12 4 9 Clearing Saved Test Dal sual K ln El nya danan liye nak n na k 14 4 10 Resetting the Microprocessor eem m 14 5 0 CALIBRATION amp MAINTENANCE eene nennen 15 5 1 Entering the Calibration Mode amp Testing the Display Segments 15 5 2 Ambient Temperature Calibration sss 16 5 3 Os SENSOR ZENO i akk lon lxk day eroe De ce kan Pe crure cR ere Ee Ce ek nk 16 5 4 Oz Sensor Replacement aiiis 18 5 5 Pump Assembly Replacement ssssssssseeeee 19 6 0 PARTS amp SERVICE asse aeaaeae aeaea Haaa iaaiaee 21 6 1 Replacement PAL Saca R tee puc vo kaka 21 0 2 ACCOSSOLIOS uites tir coni 222p2p2p2p2pppnnmDD222nnnnm 0 9 Service Centers eL eet inen dt Diway aei didan ana eu Rd 22 Instruction 0019 9337 Oxor LT Notes ii Instruction 0019 9337 Oxor ILI 1 0 INTRODUCTION The Oxor amp III is a portable analyzer designed to detect and display concen trations of Oxygen Og gas between 0 and 20 9 The analyzer is capable of testing for O5 in both ambient room air and in the flue gas stream of fossil fuel fired furnaces and boilers with optional probe assembly Ordering Information Part No
12. he new sensor Properly dispose of the old oxygen sensor see instruction sheet that comes with the new sensor Mount the new oxygen sensor in its socket If the sensor socket was removed in Step 2 re attach it to the case Plug the oxygen sensor s electric connector into the printed circuit board observe polarity see Figure 5 2 Reassemble the analyzer Note The sensor may take several hours to stabilize after being con nected to the printed circuit board 18 Instruction 0019 9337 Oxor LT 5 5 Pump Assembly Replacement Material Required Pump P N 0024 3048 1 Phillips Screwdriver Procedure 1 Disassemble the analyzer as follows a Remove the battery cover and the batteries uncovering one of the cover hold down screws b Remove and set aside all four cover hold down screws c With the analyzer on its back remove the front cover laying it face down to the left of the body d Carefully remove the circuit board slipping off the battery con nector on top and then laying the circuit board face down in the top cover see Figure 5 2 2 Slip off the pump motor s electrical connector from the circuit board 3 Unscrew the pump s hold down clamp and remove it from the pump see Figure 5 2 Make note of how the pump wiring is routed 4 Make note of how the tubing connects to the pump then carefully remove tubing from pump 5 Remove the old pump and discard 6 Instal
13. isposable AA Alkaline batteries Operating Time Up to 18 hours continuous pump running and backlight off Warm Up Time 60 seconds Display s ERR 4 digit by 2 line 7 segment Liquid Crystal Display Front Panel Controls Six push button switches refer to Section 3 3 Operating Temperature Range 0 to 40 C 32 to 104 F H mdaty eter iret 15 to 90 RH non condensing Printer Port eeeesss IrDA or HP protocol Weisheit tan eerte 16 oz with batteries xi AME benk 7 5 H x 3 1 W x 2 1 D 190x79x53 mm 2 Instruction 0019 9337 Oxor LT 3 0 PREPARING THE ANALYZER FOR OPERATION To prepare a new analyzer for operation you must install four AA Alkaline batteries install the probe if needed and set the correct time and date as described in the following paragraphs For your convenience and to ensure that the analyzer will provide reliable O readings the O sensor was installed and the analyzer calibrated on a known concentration of O at the factory 3 1 Battery Installation Install fresh batteries as described below Check the analyzer for sufficient charge prior to each use Replace the batteries if the low battery symbol wa appears in the lower right corner of the LCD To install batteries 1 Remove battery cover from back of unit see Figure 3 1 2 If old batteries are installed remove and properly dispo
14. l the new pump and reinstall the tubing taking care not to pinch or crimp the tubing Also be sure that the pump wiring is routed as was noted in Step 3 7 Reassemble the analyzer Instruction 0019 9337 19 Oxor LT 6 0 PARTS amp SERVICE TO BATTERY CO SENSOR GASKET TO O2 SENSOR PUMP HOLD DOWN zu CLAMP PUMP 4 RED WIRE Back Case Component Locations PCB Locations Figure 5 2 20 Instruction 0019 9337 Oxor LT 6 1 Replacement Parts Description Part No Oxygen Sensor With Gasket 0024 8106 Oxygen Sensor Gasket u ekere erek eee keke kek ke kK KAK RR 0024 1111 P mp Assembly zuo MIENNE 0024 3048 Battery DOOL peosier nean n cet lese oae Oe eee b ban etos eve bod ak y 0019 0525 Basic Probe Hose Assembly ccccccessssseccesececceeseesessssssseeeeeceeeees 0019 8086 6 2 Accessories STANDARD ACCESSORIES Battery AA Alkaline Qty 4 0204 0004 Instruction Manual esses ye beh eene nennen nnns 0019 9337 Hard Carrying Case ene tien ttt dak ka n da kek den ka Ea A V n h dee 0024 0865 OPTIONAL ACCESSORIES AC Adapter Battery Eliminator eese 0024 1254 Calibration Ki eieieer toten eetooe dita eec ete ta eed toot eoe teh pee 0024 7059 Gas Cylinder 100 Ng iuisiaentibeikutvbesis onec kenan reee dada b edat blamde 9550 0492 Printer Wireless IrDA sees eene 0024 1400 Printer Paper 1 Roll
15. o output a sen sor error will not occur Instead the O reading will be 0 0 as displayed in the O Screen o SEnS Ere 10 Instruction 0019 9337 Oxor LT 4 5 Using the Backlight The LCD can be read in dimly lit areas by pressing the LIGHT button The backlight automatically turns OFF after 10 minutes of keyboard inactivity but can be turned OFF at any time by again pressing the LIGHT button 4 6 Saving Test Data in Memory Up to 10 individual sets of test data can be saved in memory as follows Note When memory is full the next reading saved will over write the oldest reading 1 If the analyzer is in its Run Mode press the HOLD button twice to enter the Print Memory Menu Screens If the analyzer is already in its Hold Mode press the HOLD button only once The first menu item displayed is the Print Screen Pent 2 Press the X button once to display the Save Screen The number shown in this screen represents the memory location 1 thru 10 to which the current test data will be saved SALE 3 3 Press ENTER to save the test data and return to the Hold Mode or press HOLD to return to the Hold Mode without saving Instruction 0019 9337 11 Oxor LT 4 7 Opening and Viewing Saved Test Data Perform the following to open and view saved test data E 4 8 Note If no test data has been saved the option to open the memory for viewing will not be available If the analyzer is in its
16. ocopied reproduced or translated to another language without the prior written consent of Bacharach Inc Copyright 2002 2010 Bacharach Inc all rights reserved BACHARACH and Oxor are trademarks of Bacharach Inc All other trademarks trade names service marks and logos referenced herein belong to their respective companies A Instruction 0019 9337 Oxor LT Contents 1 0 INTRODUCTION 2 0 TECHNICAL CHARACTERISTICS eene nnne 3 0 PREPARING THE ANALYZER FOR OPERATION 3 1 Battery Installation 3 2 Probe Installati ri ice bie Me A 3 3 Front Panel Pushbuttons SS i iy kn kulane k kaka hale daye aka darka k 3 4 Setup MOd6 E ine yA kek a 3 4 1 Entering Set ieissa inienn dieyaia a eaa iai xaka dakae 3 4 2 Temperature Units Setup si i alat yadi Lakin sanaan 343 Ti m Setup rc tee t a estu idea rey k n kiry ane 3 4 4 Date Setup aman Hie alarak ces ania tu doe kadan zindan 34 5 Year Setup e dan ee n da d n edet d Pasa vr ked dee 3 4 6 Selecting Printer Protocol rasini 3 4 7 Exiting the Setup Screen ssssssssssssesss 4 0 OPERATION inaia unici aa aaan aaao tu HEKE KEWEK RAKR 4 1 Taking a Gas Sa Dl A0ca1y l ya alyak aa da ak d za anda a k dan AD Enon ao RTL 10 4 3 Turning OFF the Analyzer 10 4 4 O Sensor Error Screen ssssssssssseseeeeeeen nnns 10 4 5 Usin
17. ration values and enter the Run Mode Or press the I O button to exit the Calibration Mode and turn off the analyzer without saving the changes Leave top port open Regulator lo n 1 connector meter o 209 feme uS uem fam CO we Gas Oylinder Contained in Calibration Kit Gas fitting Figure 5 1 Calibration Kit Hookup Instruction 0019 9337 17 Oxor LT 5 4 O Sensor Replacement Material Required Oo Sensor P N 0024 8106 1 Phillips Screwdriver Procedure Disassemble the analyzer as follows a Remove the battery cover and the batteries uncovering one of the cover hold down screws b Remove and set aside all four cover hold down screws c With the analyzer on its back remove the front cover laying it face down to the left of the body d Carefully remove the circuit board slipping off the battery con nector on top and then laying the circuit board face down in the top cover Slip off the oxygen sensor s electrical connector from the circuit board Push down and twist counterclockwise Then pull the oxygen sensor out of its socket see Figure 5 2 Tip To obtain a better grip on the oxygen sensor it may be necessary to remove the screw that secures the sensor socket to the case Using the old sensor as a guide remove the paper backing from the new sensor gasket contained in the replacement kit and adhere it to t
18. reen when held down for 2 seconds while in the Calibration Mode Aborts turn off and keeps the analyzer turned ON when pressed during either the 5 second turn off delay period Freezes the display and stops the pump during a test Starts a printout when pressed twice with the pump run ning or when pressed once with the pump OFF Sets up the analyzer to be placed into its Setup Mode when held down with the analyzer OFF Used in conjunction with the I O button LIGHT Toggles the backlight ON and OFF Instruction 0019 9337 Oxor LT 3 4 Setup Mode The analyzer is preset at the factory for the parameters shown below but can be changed as described in their associated sections Function Parameter To Change Temperature Unit F Section 3 4 2 Time Not Set Section 3 4 3 Date Not Set Section 3 4 4 Year Not Set Section 3 4 5 Printer IrDA Section 3 4 6 3 4 1 Entering Setup 1 With the analyzer turned OFF press and hold down the HOLD button 2 Press and release the I O button 3 Release the HOLD button 4 The analyzer is now in its Setup Mode Refer to Sections 3 4 2 thru 3 4 6 for information on how to set the analyzer s various parameters 3 4 2 Temperature Units Setup The Temperature Units Setup Screen is labeled Unit 1 Enter the Setup Mode per Section 3 4 1 If necessary repeatedly press ENTER until the Temperature Units Setup Screen is displayed 6 Instruction 0019 93
19. se of the batteries 3 Observing the polarity markings inside the battery compartment install four AA Alkaline batteries 4 Replace battery cover i Remove battery cover by pressing here and siding cover outward Figure 3 1 Battery Installation Instruction 0019 9337 3 Oxor LT 3 2 Probe Installation To install the probe simply slide its hose over the GAS inlet of the ana lyzer see Figure 3 2 Hose Filter Figure 3 2 Probe Connection 4 Instruction 0019 9337 Oxor ILI 3 3 Front Panel Pushbuttons Note that a push button may perform several functions depending on what screen is being displayed at the time I O amp e amp e ENTER HOLD Turns analyzer ON OFF There is a 60 second warm up and a 5 second turn off delay period Places the analyzer into either its Setup or Calibration Mode when used in conjunction with the ENTER or HOLD button Causes the displayed value to increase or change while in the Calibration or Setup Mode Causes the displayed value to decrease or change while in the Calibration or Setup Mode Starts a test pump ON Sets up the analyzer to be placed into its Calibration Mode when held down with the analyzer OFF Used in conjunc tion with the I O button Stores the displayed value and automatically steps to the next screen when pressed during calibration or setup Displays the O sc
20. twice to display the Print Screen Prat 2 Press ENTER to start printing Instruction 0019 9337 13 Oxor LT Print All Test Data 1 With the analyzer in its Run Mode press the HOLD button twice to display the Print Screen Then press the X button to display the Print All Screen Pent Pent RLL 2 Press ENTER to start printing 4 9 Clearing Saved Test Data Clear all saved test data as follows Note If no test data has been saved the option to clear memory will not be available 1 With the analyzer in its Run Mode press the HOLD button twice to display the Print Screen Prat 2 Press the M or X button to scroll to the Clear Screen and then press ENTER to display the Clear All Screen Cle Cle ALL 3 Press ENTER again to clear memory and return to the Hold Mode or press HOLD to return to the Hold Mode without clearing memory 4 10 Resetting the Microprocessor If the analyzer locks up and cannot be turned OFF reset the microproces sor by removing one of the batteries for 5 seconds 14 Instruction 0019 9337 Oxor ILI 5 0 CALIBRATION amp MAINTENANCE 5 1 I Important Fresh batteries should be installed and the unit allowed to stabilize at room temperature for at least two hours before proceeding with calibration To maintain ac curacy as listed in the Technical Characteristics Section of this manual the standards used must be at least 4 times as accurate as the state

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