Blender Service Manual Read More
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1. SER p Y VLE DAN URTURI CNN Ez OB p ALARM AIR IN OXYGEN PRIMARY PORT IN O2 OUT Figure 4 2 WARNINGS CAUTIONS WARNINGS Only qualified trained service technicians should attempt repairs and service when needed The blender must not be exposed to extremely high temperatures as in the case of steam autoclaving which could reach 145 degrees F 62 degrees C The blender is designed to operate from a 50 psig source of air and oxygen An oxygen analyzer should be used to verify the gas concentration and when making any adjustments to the concentration Be certain all components are properly installed prior to pressurizing the blender Parts improperly installed may be ejected Ohio Medical cannot be held responsible for any failure to adhere to the recommendations set forth in this manual Because this is a CE marked device it must never be modified without prior expressed written consent from Ohio Medical The factory installed Air and Oxygen gas supply fittings which contain essential check valves and filters must not be substituted with any other parts not approved by Bio2. av Wd SHL Svid ALDI Wd 80024 3 0 26 LOW FLOW BLENDER LNOHLIM OL LIFNANS SLUVd T1V LON ISN SI NOVHHdVIO 21 ILON vesvie asn SLLSV Id SI 12 ALON 8Sv 18 SSN N3H L OLLSV SI KXIB8N3SSV tHi3HAVHO SNIONY TB zl 2 ALON 14024018 YINOLSNI LOVLNOD NOLIVAROJNI SYOW 9 15 NOLLVUNSISNOD TAINS SI MIIA c ILON C AB G31v29IONI SRV LA Wd NI 6 1 X04 8002 Dvd sosya ASSY N39AXO 05 18 ASSY 10045 5 27 LOW FLOW BLENDER WITH ON OFF SWITCH 50519 55 9 N39AXO nn Da aj 3 8 eo MED ma VUTVAd je S gt Le cues AE 1 2 4 V 2 RE AG N a ASSY AYD 70045 AN SLYVd 11 LON EA ev 4 010 108 3SN 335 SI 31 310N VL d rodin Nd vesv 19 3SN m 5 SI H3O0N318 dl SLON EN 42 e 310N 335 so STON 8S
3. amp 031 lt PSPA009 c5 4 PFILOO8 lt lt PRINO11 CD lt PRINO23 Figure 9 5 6 9 Assemble the duckbill check valve spacer and filter into the fitting as illustrated in the diagram If the spacer is black the duckbill fits into the recessed area of the spacer 5 6 10 Reassemble the two halves and reinstall into the block where it is labeled OXYGEN It is a left thread so it must be turned counterclockwise to install 5 7 AIR SUPPLY FITTING AND FILTER AND CHECK VALVE 5 7 1 5 7 2 Remove the Air supply fitting from the block refer to 5 5 2 Remove and replace the filter spacer and duckbill check valve If the spacer is black the duckbill fits into the recessed area of the spacer 13 5 7 3 5 7 4 5 7 5 Remove and discard the o ring from the Air fitting Clean the fitting Lightly grease a new o ring and replace it over threads of fitting Install the fitting over the filter in the block 5 8 PRIMARY OUTLET FITTING 5 8 1 5 8 2 5 8 3 5 8 4 5 8 5 5 8 6 Using a 34 wrench remove the primary outlet fitting from the bottom of the block Once it is removed there will be a loose spring inside the cavity Remove the check valve plunger that is inside the fitting Remove all o rings and clean the plunger and fitting Lightly grease new o rings and install them on the plunger and fitting Place the spring if removed
4. pushed in and turned 5 10 2 Set the flowmeter to the OFF position as Ms instructed by the label on the flowmeter mount ya 5 10 3 Remove the GAS ON GAS OFF label wes D aas 5 10 4 Using a 1 16 hex wrench loosen the two gt setscrews closest to the flowmeter and K pull off the flowmeter el E 5 10 5 Using the same hex wrench loosen the bI e 75 outer setscrews the remaining half of ff the flowmeter mount and pull this part off gt Do not disturb the other setscrews 5 10 6 Using a 34 wrench remove the remaining ON OFF valve Once it is removed there will be a loose spring inside the cavity 5 10 7 Remove the valve stem from the valve bushing 5 10 8 Remove all the o rings and clean the parts 5 10 9 Lightly grease the new o rings and install all but PRINO32 according to the illustration This one will be installed during reassembly 5 10 10 Insert the valve stem into the bushing from the threaded end leading with the end of the stem with no o ring installed 5 10 11 With the spring properly positioned in the bottom of the cavity in the blender manifold reinstall the valve assembly and tighten it with the 34 wrench Press on the valve stem and verify it moves smoothly against the spring 5 10 12 Slip the first half of the flowmeter mount with the pins protruding within the inner diameter over the valve stem and engage the pins within the slots in the valve bushing Push it
5. High Low Blender with an assembled 0 15 2 108 LPM bleed ON flowmeter and a unique ON OFF bleed Switch Note 1 Mounted on Crossvent 2 ventilator Note 2 Mounted on Crossvent 3 amp 4 ventilators Note 3 Some special order blenders may not have a bleed in this port For these blenders the output range would be the same as for those flows indicated with no bleed NOTE The NEO BLEND with two flowmeters conforms to the model 6750 0018 9XX configuration with flow limited by the flowmeters Refer to Addendum 2 the beginning of this manual 4 1 1 PRIMARY OUTLET Figure 2 illustrates the flow pattern when air and oxygen are provided to the inputs under normal conditions using the primary outlet for the exiting of blended gas The gas sources enter the lower section of the blender where they pass by a shuttle spool This spool is used for the alarm and remains balanced in this instance thus blocking passage of gas to the alarm The gases continue into the first stage of a two stage balancing chamber Here the diaphragm reacts to any difference in source pressures and helps equalize these pressures From here the gases continue into the second stage of the balancing chamber where again a diaphragm adjusts to equalize any remaining difference in pressure The gases then exit the balancing chamber and enter the proportioning valve Here the two gases are metered to the proper proportions resulting in the concentration as set by the knob on
6. Even though the flowmeter on the right is not being used having it in the vertical position activates the internal bleed thereby guaranteeing accuracy while using the left side flowmeter at flows below 3 LPM High Low with Bleed Switch Blender 6750 0026 9XX Right Flowmeter Blender models 6750 0026 9XX is always offered with an assembled flowmeter The flowmeter on the right side is mounted to a uniquely designed rotating bleed switch that is used in the same manner as the knob described in Addendum 1 Any time these blenders are used in a flow range requiring the bleed to be active rotating this flowmeter as described below will activate the bleed as well as the flowmeter Even if the flowmeter is not to be used positioning it vertically so the bleed is active allows the blender to be used with its lower flows The flow rate for these flowmeters should be set using the center of the ball RIGHT SIDE FLOWMETER The right side flowmeter and the blender bleed is inactive when the flowmeter is angled towards the front of the blender To activate it and initiate the required bleed for lower flows push the flowmeter in towards the side of the blender and then rotate it clockwise towards the back to its vertical position The internal bleed will now be active and the flow rate may be set using the knob on the flowmeter As long as the flowmeter is in this position any output port can be used for low flows even if the flowmeter itself is not being
7. Intensity 80 at 1 foot Dimensions Height 3 1 2 8 9 cm Width 2 1 4 5 7 cm Depth 2 7 8 7 3 cm Approximate Weight 2 35 lbs 1 07 kg basic low flow model with plastic chamber plates or 3 15 lbs 1 43 kg basic low flow model with aluminum chamber plates 30 io Medical Corporation always there for life 1111 Lakeside Drive Gurnee IL 60031 4099 866 549 6446 Tollfree 847 855 0800 Phone 847 855 6218 Fax Customer Service and Distribution Center Technical Support Sales and Service Equipment Service Center Ohio Medical Corporation 1111 Lakeside Drive Gurnee IL 60031 USA Toll Free 866 549 6446 Phone 1 847 855 0800 Fax 1 847 855 6218 Manufactured By BIO MED DEVICES INC Distributed by Ohio Medical Corporation 1111 Lakeside Drive Gurnee IL 60031 USA 1 866 549 6446 fax 1 847 855 6218 www ohiomedical com www miniox com P N 6700 0494 000 Rev 2 06 2015 0086 31
8. Med Devices Doing so may cause gas supply contamination due to back flow CAUTIONS Moisture or dirt can affect the operation of the blender a clean dry gas source must be used at all times The air must meet USP compressed air and ANSI Z86 1 1973 grade F and water vapor content cannot exceed a dew point of 5 degrees F below the lowest ambient temperature to which the blender and accessories are exposed A water trap assembly and filter must be used to avoid malfunction should water accidentally get into the gas supply sources Always apply pressure to the blender slowly If the blender has a flowmeter on the left side it is stationary Do not try to rotate it Always follow all industry standards for medical gas products especially E 7 and Oxygen Handling G 4 Do not immerse assembled blender in liquid Product contains magnetic ferrous material that may possibly affect the results of an 3 PREVENTIVE MAINTENANCE Periodic preventive maintenance should be performed to insure continued proper operation of the blender The frequency of preventative maintenance is determined by many factors some of which are Frequency amp length of use Quality of the compressed gas source s Environmental conditions Recommended Maintenance Schedule Every year between PM s Calibration certification Every 2 years Major overhaul cleaning and calibration Recommend return to factory for this service Gas Inlet Filter The
9. SIDE PORT CAP 5 12 1 5 12 2 5 12 3 5 12 4 Using the appropriate spanner remove the cap on the side port s Remove the o ring and clean the cap Lightly grease the new o ring and replace over the threads of the cap Screw the cap back into the block and tighten with the wrench Figure14 16 5 13 MUFFLER 5 13 1 From the underside of the block carefully pry out the retaining star clip and remove the foam muffler 5 13 2 Insert the new muffler into the cavity and press the star clip back into place Note that the clip has a slightly concave form to it This is to aid insertion and 9 retention PMUF001 7 MRINO10 Figure 15 5 14 FINAL ASSEMBLY 5 14 1 Once the block has been completely reassembled reinstall the two balancing chambers to the top of the block Be sure the o rings are properly fitted into the orifices in the bottom of the chambers 5 14 2 If balancing chamber material is aluminum then tighten amp torque the four chamber screws to 47 in lb using a using a calibrated 5 32 hex wrench 5 14 3 If balancing chamber material is plastic then tighten amp torque the four chamber screws to 30 in Ib using a using a calibrated 5 32 hex wrench 5 14 4 Reinstall the front plate and retaining nut Leave the nut loose and the knob off for the calibration procedure to follow 5 14 5 Reinstall the outer cover and then any side output ports removed Refer to 5 9
10. all the way against the bushing so that the o ring groove on the end of the valve stem is exposed 5 10 13 Lightly grease the remaining PRINO32 that was left off previously and install it on the end of the valve stem 5 10 14 Now slide this mount back out over the o ring just installed until the end of it is flush with the end of the valve stem Tighten the setscrews in this position Test the actuation of the ON OFF valve by pushing in turning and releasing the mount It should move without binding 5 10 15 With the valve in the ON position pushed in and turned clockwise install the flowmeter onto the valve so that it is upright parallel to the front of the blender and tighten the setscrews 5 10 16 Push in and turn the flowmeter to the OFF position It should be angled to the front Adhere the ON OFF label onto the flowmeter mount so that in the OFF position the GAS ON portion of the label is facing forward When the flowmeter is in the ON position the GAS OFF portion of the label should rotate and now face forward v P a PRINOS2 15 5 11 HIGH LOW FLOW KNOB 5 11 1 5 11 2 5 11 3 5 11 4 This step only applies to blenders with a knob in this position that can be pushed in and turned Set the knob to the greater than gt position as instructed by the label on the side of the blender gc Seino Using a 1 16 hex wrench loosen MS PRINO32 the two setscrews closest to th
11. from the front seat and remove all o rings from all parts Do not overlook the small o ring inside the front valve seat in the spanner hole end 5 3 7 Clean and carefully inspect all parts paying particular attention to the valve seat areas where the valve shaft tapers make contact with the seats Replace if they show any signs of wear or nicks 5 3 8 Lightly lubricate and reinstall all o rings Do not overlook the small o ring inside the front valve seat at the spanner hole end 11 5 3 9 Install the rear seat using the 1 8 hex wrench 5 3 10 Place just enough grease on the end of the new spring to keep it from falling out of the rear valve shaft Insert the spring into the end of the shaft and install the shaft into the rear seat spring end first 5 3 11 Lubricate the threads on the front valve shaft and thread it into the front valve seat just far enough so the taper touches the seat 5 3 12 Thread the front seat into the block just far enough that the outer most o ring is within the block 5 4 ALARM SPOOL amp BYPASS VALVE 5 4 1 Using a spanner remove the PRINO21 cap from the left side of the block Cie X and then tip the block on its side _ 9 to remove the spring which is BBTROTU inside 007 008 5 4 2 Using 1 8 hex wrench remove the alarm adjusting screw Spinone from the center of the cap PRINO21 5 4 3 From the opposite side remove the spool assembly with the same
12. of the air supply fitting 5 5 3 Using soft jaw pliers remove the alarm housing from the bottom of the block 5 5 4 Remove the o ring from the housing and discard 5 5 5 Lightly grease the new o ring and install on the alarm housing 5 5 6 Reinstall the housing into the block 5 6 OXYGEN SUPPLY FITTING with FILTER AND CHECK VALVE 5 6 1 5 6 2 5 6 3 5 6 4 5 6 5 5 6 6 5 6 7 5 6 8 Remove the supply fitting refer to 5 5 1 Using two 34 wrenches separate the two halves of the fitting This is a left hand thread so turn it clockwise to separate Remove the filter spacer and duckbill check valve that is under the filter and discard Take the half with the free turning nut on it and insert a 1 8 hex wrench into the nipple within the nut Hold the other end with 4 wrench and unscrew the nipple This thread has thread lock on it so it may require a little effort Remove all o rings from all parts and clean the parts thoroughly Be sure to properly clean the thread lock from the nipple Lightly grease new o rings and install on the nipple Insert the nipple through the nut and place a small amount of thread lock on its threads Screw the nipple into the hex fitting and tighten Check for any excess thread lock between the nut and hex that may have flowed out from the threads and clean off if present Lightly grease and install new o rings over the threads of the two halves PRINO11 D
13. removing the cap on the front and loosening the nut underneath Pull off the knob 6 1 3 Rotate the shaft counterclockwise until the valve just seats A slight resistance should be felt Do not force 6 1 4 Taking care not to move the shaft carefully replace the knob and position the needle against the 21 stop 6 1 5 Tighten the nut on the knob collet When doing this be sure the knob is far enough away from the locking nut underneath it so that as it is turned to 100 it does not bottom out on the nut before reaching the 100 position 6 1 6 Turn the knob clockwise until a slight resistance is felt or until the knob reaches the 100 stop pin Ultimately these should occur simultaneously Do not force Once resistance is felt this means the rear shaft is seating in the rear seat and 18 turning the shaft beyond this point may damage the seat If the shaft seats prior to the knob reaching the stop pin then go to the next step If the knob reaches the stop pin prior to the shaft seating then go to step 6 1 8 6 1 7 If the shaft seated before the knob reached the stop then the front seat is threaded into the block too far Make a mental note of how far away from the stop pin the knob pointer is and then turn the knob back to the 2196 stop Remove the knob by loosening the nut on the knob collet and pull the knob off the shaft Loosen the locking nut on the front seat and using a spanner turn the seat and shaft together as one counte
14. stop then observe the actual concentration as indicated by the analyzer Loosen the knob on the shaft and without turning the shaft position the knob pointer approximately where it would be to give the observed concentration if it was properly calibrated Make a mental note of how far away from the stop pin the knob pointer is in this position This represents approximately how far the seat needs to be turned to correct the error Remove the knob loosen the seat s locking nut and slowly turn the seat clockwise by this predetermined amount Taking care not to disturb the seat re lock the seat turn the shaft to the 100 position and replace the knob against the 100 stop pin Recheck 2196 and 10096 Then check 3095 6096 and 9096 as well Repeat these steps as many times as necessary until all points are within 3 full scale 6 2 13 as described in step 6 1 11 it is still 21 when the knob is away from the 2196 position then turn the knob to the point where the concentration begins to rise Make a mental note of how far away from the stop pin the knob is at this point Then without changing its position remove the knob loosen the seat locking nut and turn the seat and shaft together counterclockwise by an amount corresponding to approximately 1 2 the distance the knob was noted to be from the stop pin Lock the seat with the nut turn the shaft to 10096 and replace the knob Recheck 2196 and 10096 Then check 30 60 and 90 as well Repea
15. the front of the blender From the valve the now blended gas exits the blender through the primary outlet Each outlet has a check valve that prevents gas from passing through it unless a hose or other device is threaded onto it THEORETICAL REPRESENTATION D KA S Z WY JE OXYGEN PRIMARY PORT IN BLENDED GAS OUT Figure 2 1 2 AUXILIARY OUTLET Figure 3 illustrates the same conditions as Figure 2 but with the blended gas exiting the low flow auxiliary port Use of this port induces a bleed to atmosphere which is necessary to maintain accurate concentrations when using the blender at flows of less than 15 LPM 3 LPM in the Low Flow Blender THEORETICAL REPRESENTATION SENSN SS S elem NS C777 Li A Pn WW sf BLEED AIR IN OXYGEN AUXILIARY PORT IN BLENDED GAS OUT Figure 3 1 3 ALARM C
16. 17 6 CALIBRATION amp TEST PROCEDURE Tools required 1 8 hex wrench Adjustable Spanner 9 32 nut driver 5 8 wrench 11 16 wrench 0 to gt 120 LPM flow valve or flowmeter Flow measurement device Oxygen analyzer Minimum supply pressures required are Oxygen 50 psi Air 50 psi Oxygen analyzer should be capable of displaying concentrations in at least tenths 6 1 PROPORTIONING VALVE HI LOW FLOW BLENDER Refer to 6 2 for Low Flow FRONT SEAT REAR SEAT Z Figure 16 Objective When the knob is set to 21 the front seat is closed due to the taper of the front shaft being seated into the front seat orifice The rear seat is fully open and allows only air to pass As the knob is then turned to 100 the shaft moves back thus progressively opening the front seat while at the same time progressively closing the rear seat until the knob reaches 100 and the rear seat is closed The rear taper must seal the orifice in the rear seat and the knob must reach the 100 stop pin simultaneously In order to do this the distance between the front and rear seat is critical The following procedure will establish this distance by positioning the front seat which can be moved relative to the rear seat which is fixed 6 1 1 If the blender has not been disassembled and only its calibration is to be verified go directly to 6 3 Otherwise proceed with 6 1 2 6 1 2 If the knob is on remove it by
17. 3 for setup Use supply pressures that are standard for the area in which the blender will be used 6 4 2 Lowerthe air supply pressure until the alarm sounds Air supply pressure should be 20 2 psi below the oxygen supply pressure at this point i e 30 psi if is 50 psi If the pressure is not within this range at the point of alarm then proceed with the next step 6 4 3 If the blender has a cover it must be removed to access the alarm adjustments Remove the four cover screws two on each side and remove the cover With older covers the auxiliary output must also be removed if present in order to 22 remove the cover 6 4 4 The alarm adjustment is located on the side of the blender closest to the supply that failed in this case the air side If the alarm sounded at a pressure higher than the specification in 6 4 2 i e 40 psi if O2 was 50 psi then turn the hex screw in clockwise gt turn and return to 6 4 2 If the pressure was lower than the specification in 6 4 2 i e 20 psi if was 50 psi turn the adjuster out counterclockwise V2 turn and return to 6 4 2 Continue adjusting the alarm in smaller and smaller increments until lowering the air pressure causes the alarm to operate properly 6 4 5 With the alarm now sounding slowly raise the air pressure The alarm should stop before the pressure reaches 15 psi above the properly calibrated pressure as described in step 6 4 2 6 4 6 Repeat for the oxygen suppl
18. ANALYZER OUT OF CALIBRATION BLENDER OUT OF CALIBRATION BLEED ON BOTTOM OF BLENDER IS RESTRICTED AIR IS BEING INTRODUCED INTO THE SYSTEM AFTER THE BLENDER AND DILUTING CONCENTRATION AIR AND OXYGEN SOURCE PRESSURES HAVE GREATER THAN 20 PSI DIFFERENTIAL ALARM SYSTEM IS OUT OF CALIBRATION DIRTY GAS IS CONTAMINATING ALARM SYSTEM PRESSURE BALANCE CHAMBER NOT WORKING PROPERLY 90 psi 206 8 kPa for units sold overseas 25 TO SOLVE PROBLEM CALIBRATE OXYGEN ANALYZER CALIBRATE ACCORDING TO INSTRUCTIONS CLEAN BLEED ORIFICE IN AUXILIARY PORT CORRECT SITUATION BY FINDING AND REMOVING THE FLOW OF AIR BRING THE SOURCE PRESSURES WITHIN THE 20 PSI RANGE CALIBRATE ALARMS PER INSTRUCTIONS CLEAN AND CALIBRATE BLENDER CORRECT DIRTY GAS SOURCE SERVICE BALANCING CHAMBERS HIGH LOW FLOW BLENDER 9 PARTS ZONYHO OL LORENS 14 189 318V IVAV SLYVd 11 LON voLOviQd ISN N3335 3 ILON 8 asn 2LLSY SI SAd ALON 95 18 ISN OLLSY Id SI ATQNASSY 2 j38AYHO ONIONS dl 2 ALON 43AOLSn9 LOVLNOO NOLLVARIOGNI SHOW Od Sil TH SSSY Y NIVINOO SNOLLYMfI9I3NOO H3ONd T8 H3ONS TS v SI MIIA 1 ILON 9002159 lt AEN 70085 9 ASSY H3B8MYHO ONIONYTVH 4 1
19. LOW FLOW BLENDERS meter to 6 1 for High Low Flow model FRONT SEAT REAR SEAT Figure 17 Objective When the knob is set to 2196 the front seat is closed due to the taper of the front of the shaft being seated into the front seat orifice The rear seatis fully open and allows only air to pass Asthe knob is then turned to 10095 the shaft moves back thus progressively opening the front seat while at the same time progressively closing the rear seat until the knob reaches 100 and the rear seat is closed The rear taper must seal the orifice in the rear seat and the knob must reach the 100 stop pin simultaneously In order to do this the distance between the front and rear seat is critical The following procedure will establish this distance by positioning the front seat which can be moved relative to the rear seat which is fixed 6 2 1 Connect 50 psi Air and Oxygen supplies to their respective inputs on the 19 blender Tee into each of these supply lines a pressure gauge so that pressures can be accurately set and monitored 6 2 2 Connect the primary blender output to flow valve capable of gt 50 LPM a flow measurement device and an oxygen analyzer per the manufacturer s instructions Refer to Figure 18 6 2 3 Turn on both supply pressures simultaneously and fully open the flow valve connected to the blender output 6 2 4 Remove the knob on the blender if it is not already removed Turn the shaft clo
20. ONDITION The blender has an audible alarm built in to detect if either of the gas sources changes by more than 20 psi 30 psi for units sold overseas from the other This will warn the user that they are running out of one of the gas sources or that there is a severe pressure drop in one source both gas sources drop or increase together such that a 20 psi 30 psi for units sold overseas difference cannot be detected then no alarm will sound If the blender is connected but not being used and a 20 psi 30 psi for units sold overseas difference in gas sources develops the blender will not alarm The blender alarm bypass function will provide 90 LPM 230 LPM capability in the Low Flow Blender upon the loss of air or oxygen if the remaining gas is at 50 psi Fig 4 illustrates the flow 26 pattern when the air source is lost and only oxygen is provided to the input using the primary outlet for the exiting of gas Notice two major events occurred relative to the previous figures First the alarm shuttle has shifted to the air side due to the absence of pressure on this side This now exposes the passage to the alarm and the bypass to the outlet Second the diaphragm in the first stage of the balancing chamber has shifted due to the imbalance of pressure and has closed the oxygen side THEORETICAL REPRESENTATION 6 EX _
21. Ohio Medical Corporation always there for life Air Oxygen Blender Service Manual P N 6700 0494 000 Rev 2 06 2015 0086 5 ADDENDUM 1 BLEED 3 ADDENDUM 2 BLEED SWITCH 3 1 INTRODUCTION AND OPERATION 4 2 WARNINGS AND CAUTIONS 8 3 PREVENTIVE MAINTANENCE 9 4 TOOLS 9 5 DISASSEMBLY amp REASSEMBLY 10 6 CALIBRATION amp TEST PROCEDURE 18 7 PERFORMANCE CHECK 24 8 TROUBLE SHOOTING GUIDE 25 9 PARTS 26 10 BLENDER WARRANTY 29 11 CE MARK 29 12 SPECIFICATIONS 30 ADDENDUM 1 Bleed Knob Model 6750 0019 9XX Blender model 6750 0019 9XX has a bleed knob that has been installed in lieu of the right side output port This enables the user to maintain accurate concentrations when using the bottom or left outputs for all flows within the specification of the blender with a simple turn of the knob A label attached to the side of the blender indicates how to position the knob for accurate concentrations at settings less than or greater than the flow rate indicated The knob must be pushed in prior to turning ADDENDUM 2 Low Flow with Bleed Switch NeO2 Blend Models 6750 0018 9XX Right and Left Flowmeter Blender model 6750 0018 9XX is always offered with assembled flowmeters The flowmeter on the right side is mounted to a uniquely designed rotating bleed switch that is used in the same manner as the knob described in Addendum 1 Any time these blenders are used in a flow r
22. ange requiring the bleed to be active rotating this flowmeter as described below will activate the bleed as well as the flowmeter Even if the flowmeter is not to be used positioning it vertically so the bleed is active allows the blender to be used with its lower flows The flow rate for these flowmeters should be set using the center of the ball RIGHT SIDE FLOWMETER The right side flowmeter and the blender bleed is inactive when the flowmeter is angled towards the front of the blender To activate it and initiate the required bleed for lower flows push the flowmeter in towards the side of the blender and then rotate it clockwise towards the back to its vertical position The internal bleed will now be active and the flow rate may be set using the knob on the flowmeter As long as the flowmeter is in this position any output port can be used for low flows even if the flowmeter itself is not being used To return the flowmeter and bleed to its off inactive state return the flowmeter to its angled position by pushing it in and rotating it counterclockwise towards the front LEFT SIDE FLOWMETER CAUTION The flowmeter on the left side is stationary Do not try to rotate it This flowmeter is meant for flows above 3 LPM It may however be used below 3 LPM with the following consideration when set below 3 LPM turn on the required bleed by setting the right side flowmeter to its vertical position following the procedure as described above
23. ck so as to expel it Watch for a ball and spring to follow it 5 4 12 the seat came out with the wrench then now tip the block so as to expel the ball and spring located in the bottom of this opening 5 4 13 Remove all o rings from the parts just removed clean the parts thoroughly and replace the o rings with new ones lubricating lightly before installing 5 4 14 Place the spring back into the bottom of the cavity and then drop the new ball in on top of it 5 4 15 Place the seat on the end of the 5 32 hex wrench and carefully lower it into 12 place above the ball Screw it down and tighten 5 4 16 Reinstall the cap reed if present and end cap Be sure to reinstall the reed in the same orientation as previously noted 5 4 17 Reinstall the spool assembly from the left side of the block and screw down snugly 5 4 18 Turn the block over and drop in the second spring so that it is within the cavity in the end of the shuttle valve within the spool 5 4 19 Install the cap with adjuster into this opening making sure the tip of it is properly positioned within the center of the spring and tighten snugly 5 5 ALARM bottom mounted 5 5 1 With 34 wrench remove the supply fitting from the bottom of the block This is a left hand thread so turn it clockwise to remove Set it aside 5 5 2 Use the same 37 wrench to remove the air fitting and set it aside Remove the filter and duckbill check valve from within the cavity
24. ckwise or counterclockwise as required until the o ring that is on the shaft can just be seen and then turn it clockwise so that the o ring is just inside the front seat and no longer visible 6 2 5 Loosen the locking nut for the front seat and turn the seat with the shaft clockwise until a flow of approximately 40 LPM is obtained as indicated by the flow measurement device 6 2 6 Lock the seat in this position by tightening the nut 6 2 7 Turn the shaft clockwise until a slight resistance is felt and 9896 10096 concentration is indicated on the analyzer 6 2 8 Taking care not to disturb the position of the shaft place the knob on the end of the shaft such that it against the 100 stop pin and tighten the collet nut 6 2 9 Using the flow valve connected to the output in the test setup adjust the flow to 30 LPM 6 2 10 Turn the concentration knob to 21 against the stop and verify the concentration is 21 22 6 2 11 If itis 21 at the stop then slowly turn the knob away from the stop being sure to give the analyzer enough time to react and watch the analyzer for the point at which the concentration begins to increase If this occurs just as the knob is moved away from the 21 position then the seat is properly adjusted If however the knob must be moved away from the stop by some distance in order to get a change in concentration then the seat is too far in so go to step 6 2 13 6 2 12 If it is higher than 22 when against the
25. e outside edge of the knob and pull off the knob Do not disturb the other setscrews Using a 34 wrench remove the ON OFF valve bushing with the slots in it Once it is removed there will be a loose spring inside the cavity Remove the valve stem from the bushing Remove all the o rings and clean the parts PRINOO4 Figure 13 Lightly grease the new o rings Insert the valve stem into the bushing from the threaded end as in the illustration With the spring properly positioned in the bottom of the cavity within the blender manifold reinstall the valve assembly and tighten it with the 34 wrench Press on the valve stem and verify it moves smoothly in and out against the spring 5 11 10 With the indicator line on the end of the knob pointing upwards and somewhat left of center slip the knob over the valve bushing and shaft engaging the two pins in the knob with the slots in the bushing Continue to slide the knob onto the shaft just to the point that it bottoms out on the shaft and you can feel it just starting to push against the spring tension of the shaft Tighten the knob to the shaft in this position by tightening the two outside setscrews It is important this is done properly or maximum flow may not be achieved when the knob is in the less than lt position 5 11 11 Test the actuation of the knob by pushing in turning and releasing it It should move without binding 5 12
26. filter element in the air and oxygen supply inlet fittings should be replaced during major overhauls or whenever they become contaminated Preventive Maintenance Parts Kit Please verify with qualified technician before beginning preventive maintenance Contact your Ohio Medical representative to order your parts kit Included in the kits are the following parts Filters O rings check valve ball balancing chamber balls duck bill check valves bleed muffler and retainer diaphragms spring label This kit is subject to change without notice 4 TOOLS Adjustable Spanner Spanner wrench 5 32 Hex Wrench 1 8 Hex Wrench 34 Open End Wrench 11 16 Open End Wrench Adjustable Wrench Needle Nose Pliers 1 Phillips Screw Driver Grease Dupont Krytox GPL 207 or equivalent oxygen safe Alcohol 5 DISASSEMBLY 4 REASSEMBLY Note Be sure the work area is clean and free from any materials or particles that may contaminate parts during the disassembly and reassembly of the blender Note Calibration procedures must be performed following servicing of the blender Note The primary focus of these instructions is for the standard Hi Low Flow Blenders Procedures for other models are essentially the same but some parts may differ Note Input and output fittings on OEM blenders may differ from what is represented here Note Plug configurations may differ from what is represented here 5 1 Cover 5 1 1 Remove the Blender Outer Cover if presen
27. g and no supply line to the O2 fitting Set up as in Figure 18 Set the blender to 60 With both air and oxygen supply pressures equal and flow coming from the blender the blender should not alarm With the flow set to 15 LPM turn off the air supply pressure The blender should alarm and 10096 oxygen should be observed on the analyzer Turn the air supply back on The alarm should stop and 5796 6396 should be observed on the analyzer With the flow set to 15 LPM turn off the oxygen supply pressure The blender should alarm and 2196 air should be observed on the analyzer Turn the oxygen supply back on The alarm should stop and 57 63 should be observed on the analyzer With 15 LPM set the blender to 21 and verify 20 8 23 concentration With 15 LPM set the blender to 100 and verify 98 10096 concentration If the blender has an auxiliary outlet connect the flow valve analyzer and flow measurement device to it set the flow to LPM and repeat steps 7 3 7 8 using this lower flow If there is a knob on the side of the blender leave the set up as in Figure 18 Set the knob to the less than indication adjust the flow to 3 LPM and repeat 7 3 7 8 using this lower flow 24 8 TROUBLE SHOOTING GUIDE PROBLEM OXYGEN ANALYZER DOESN T AGREE WITH SETTING OF BLENDER BLENDER ALARMING THE ONLY TIME THE BLENDER IS ACCURATE IS WHEN THE SOURCE PRESSURES ARE EXACTLY THE SAME CAUSE OF PROBLEM
28. ifices facing you take the bottom half of the blender lay it on it s side and hold the chamber assembly firmly against it so as to align the bottoms of the two chamber halves in a flat plane see Figure 6 5 2 11 While holding in this position reach in with a small tool and move the diaphragm by pushing on the pin until the pin is centered in the hole 5 2 12 Tighten the two screws firmly while taking care to maintain the position of the PDIAO04A o Figure 6 10 two halves against the blender bottom and the location of the diaphragm in the center of the hole 5 2 13 Turn the assembly over and install the other two screws 5 2 14 If balancing chamber material is aluminum then torque all four screws to 47 in lb using a calibrated 5 32 hex wrench 5 2 15 If balancing chamber material is plastic then torque all four screws to 30 using calibrated 5 32 hex wrench 5 2 16 Lay the assembly down and place a new ball in the seat over the diaphragm pin Be sure the ball is clean prior to installing 5 2 17 Lightly grease the new o ring and place over the threads of the cap 5 2 18 Place a small amount of grease on one end of the spring and insert this end into the hole in the cap The grease is there to help hold the spring in the hole while assembling the cap to the chamber 5 2 19 Thread the cap into the chamber with the spring over the ball 5 2 20 Turn over and repeat the call o ring spring and cal in
29. into the primary outlet cavity so it is seated in the recess in the center of the bottom of the cavity Hold the plunger over the spring so that the shoulder on the o ring end is centered in the spring and lower the fitting over the plunger Screw the fitting into the block and tighten with the wrench Figure 10 5 9 AUXILIARY OUTLET FITTING 5 9 1 5 9 2 5 9 3 5 9 4 5 9 5 5 9 6 If there is a flowmeter here go to Step 5 10 If there is a knob here go to Step 5 11 Using 34 wrench unscrew the auxiliary outlet fitting from the side of the block Once it is removed there will be a loose spring inside the cavity Remove the check valve plunger that is inside the fitting Remove all o rings and clean the plunger and fitting Lightly grease new o rings and install them on the plunger and fitting If the blender has an outside cover then finish this procedure after the cover has been reinstalled refer to 5 14 Place the spring if removed into the auxiliary outlet cavity so it is seated in the opening in the center of the cavity 14 Figure 11 5 9 7 Holdthe plunger spring so that shoulder on the o ring end is centered in the spring and lower the fitting over the plunger Screw the fitting into the block and tighten with the wrench 5 10 AUXILIARY FLOWMETER WITH ON OFF SWITCH 5 10 1 This step only applies to blenders with a gt flowmeter in this position that can be
30. n the bottom of the blender position this snugly over the bleed port and connect the other end to a flow measurement device Verify a bleed flow rate of 10 12 LPM 2 5 3 5 LPM for low flow blenders specification inspect the bleed orifice under the muffler see Figure 15 or the bleed orifice in the auxiliary output fitting for occlusion 6 3 8 Verify the concentrations delivered from the auxiliary output as indicated in the following table If it is not within this Note 1 Maximum means flow valve fully open 30 LPM for low flow blender Note 2 If this blender has no bleed in the auxiliary output then this number should be the lower of the two numbers in the flow range with no bleed as indicated in the table on page 2 6 3 9 If any of these specifications are not met re verify bleed step 6 3 7 6 4 ALARM KNOB O2 SUPPLY AIR SUPPLY FLOW CONCENTRATION PRESSURE PRESSURE LPM 96 60 50 50 MAXIMUM 57 63 60 50 50 a 57 63 60 50 60 2 57 63 60 50 40 2 57 63 IMPORTANT The following instructions assume supply pressures of 50 psi as is standard in the United States Due to the differences in supply pressures used internationally the alarm should be calibrated using the pressures at which the blender will be used Units sold overseas alarm at a pressure differential of 30 psi 206 8 kPa This value rather than 20 psi should be used in the instruction below 6 4 1 Refer to 6 3 1 6 3
31. nd oxygen supplies connected as it is here however so rather than just feeling for the shaft to meet the seat as described in Steps 6 1 or 6 2 actual concentrations can be observed as the shaft and or front seat are repositioned 5 Once the 21 and 100 have been calibrated then verify the full range of concentrations as indicated in the following tables KNOB O2 SUPPLY AIR SUPPLY FLOW CONCENTRATION PRESSURE PRESSURE LPM 95 21 50 50 15 20 8 23 30 50 50 15 27 48 60 50 50 15 57 63 90 50 50 15 87 93 100 50 50 15 98 100 24 KNOB O2 SUPPLY AIR SUPPLY FLOW CONCENTRATION PRESSURE PRESSURE LPM 21 50 50 MAXIMUM 20 8 23 30 50 50 MAXIMUM 27 83 60 50 50 MAXIMUM 57 63 90 50 50 MAXIMUM 87 93 100 50 50 MAXIMUM 98 100 Note 1 3 LPM for low flow blender Note 2 Maximum means flow valve fully open 30 LPM for low flow blender 6 3 6 If any of these specifications are not met return to 6 1 6 3 7 Note Some special order blenders may not have a bleed in the auxiliary output This is by design If your blender does not have this bleed then skip this step If the blender has an auxiliary output with a bleed on the side then remove the calibration setup from the primary output and connect it to the auxiliary output Set the flow to 2 LPM Using tubing with an appropriate fitting on one end that will cover the bleed port o
32. p to three gas outlets on the Ohio Medical blender depending on the model Figure 1 indicates the various standard configurations Figure 1 Model Number 6750 0018 907 6750 0018 927 Plugged NEC Blend with assembled 0 15 and 0 1 3 15 LPM bleed OFF 0 1 LPM LPM bleed ON Flowmeters 1 15 LPM bleed ON 6750 0018 919 6750 0018 939 3 15 LPM bleed OFF 0 3 5 LPM bleed ON NEO Blend with assembled 0 15 and 0 3 5 1715 LPM bleed ON Flowmeters B 0 15 LPM bleed ON 3 15 LPM bleed OFF 1 15 LPM bleed ON 6750 0018 910 6750 0018 930 NEO Blend with assembled 0 15 Flowmeters 0 200 CCM LPM bleed ON 6750 0018 902 3 15 LPM bleed OFF Blend with assembled 0 15 and 0 1 15 LPM bleed ON 200 Flowmeters 6750 0019 907 3 30 LPM bleed OFF Knob to switch bleed ON amp 3 30 LPM bleed OFF Low Flow Blender with ON OFF Bleed 0 30 LPM bleed ON OFF 0 30 LPM bleed ON Knob plain no flowmeter 6750 0020 907 3 30 LPM bleed OFF 0 30 LPM bleed ON Plugged Low Flow Blender plain no flowmeter 0 30 LPM bleed ON 6750 0024 907 Plugged 2 108 LPM bleed ON 15 120 LPM bleed OFF High Low Blender plain no flowmeter BE 2 108 LPM bleed ON 6750 0025 907 15 120 LPM bleed OFF 2 108 LPM bleed ON 15 120 LPM bleed OFF High Low Blender with 3 Ports 2 108 LPM bleed ON 2 108 LPM bleed ON plain no flowmeter 6750 0026 910 6750 0026 930 Plugged 2 15 LPM bleed ON 15 120 LPM bleed OFF
33. rclockwise approximating the distance the knob was away from the stop as previously noted Go back to step 6 1 4 and repeat These steps may have to be repeated several times until the proper relationship between the front and rear seats is obtained Once this is done then lock the front seat in place by tightening the locking nut taking care not to move the seat in the process 6 1 8 If the knob reached the stop pin before the shaft seated in the rear seat then the front seat is not threaded into the block far enough Hold the knob in position to prevent the shaft from turning Remove the knob by loosening the nut on the knob collet and pull the knob off the shaft Loosen the locking nut on the front seat and turn the seat and shaft clockwise together as one until slight resistance is felt indicating the shaft has seated into the rear seat Be careful that the shaft does not turn within the front seat while doing this Once the shaft has seated hold the front seat in this position and tighten the locking nut Taking care not to turn the shaft replace the knob so that it is against the 10096 stop pin 6 1 9 Performing the preceding steps should have properly positioned the front seat relative to the rear seat and the end points of the scale 21 and 100 should now be calibrated Then check 3096 6096 and 9096 as well Repeat these steps as many times as necessary until all points are within 3 full scale 6 2 VALVE
34. spanner Remove the adjusting screw from the center of PRINO23 012 the spool and remove the spring Figure 8 through the adjusting screw opening 5 4 4 Using an appropriate tool push the shuttle valve out of the spool by inserting the tool through the opening for the adjusting screw and pushing on the end of the valve Take extreme care not to mar the inner surface of the spool 5 4 5 Remove all o rings and thoroughly clean all parts 5 4 6 Lightly lubricate new o rings and replace per diagram 5 4 7 Insert the shuttle valve back into the spool and push it all the way into the opposite end Reinstall the spring through the opening for the adjuster screw and reinstall the adjuster threading it so it is flush with the end of the spool 5 4 8 Install the other adjuster screw into the cap and set the spool assembly cap with adjuster and second spring to the side 5 4 9 Remove the cap from the back of the block located in the center of the integral mounting flange Earlier blenders will have an alarm reed behind this cap If so remove it making note of which side of the reed plate is facing the cap just removed 5 4 10 Remove the second cap that is within this cavity 5 4 11 Looking deep into this cavity now beyond the area where the alarm spool would normally be the seat for the bypass valve may be seen Using a 5 32 hex wrench unscrew and remove this seat If it does not come out attached to the wrench tip the blo
35. stallation on this side 5 2 21 Lightly grease the new o rings and install them in the appropriate holes in the bottom of the assembly 5 2 22 Set the assembly aside and repeat this entire process for the second balancing chamber assembly LOWER BLOCK The lower block may only be thoroughly cleaned internally after complete disassembly Follow the disassembly instructions below saving the reassembly of each section until all parts have been removed from the block and it has been cleaned and thoroughly dried may be cleaned with alcohol Once the block is dry go back to each section and follow the instructions for reassembly of each part into the block 5 3 PROPORTIONING VALVE Note This describes the proportioning valve in the Hi Low Flow Blender For the Low Flow Blender use the methods as described here while referring to the exploded view in the PARTS sections of this manual 5 3 1 Carefully pry off the end cap on the concentration setting knob loosen the nut underneath and remove the knob 5 3 2 Using a 5 8 wrench remove the front seat lock nut and remove the front plate 5 3 3 With an appropriate spanner unscrew and remove the front half of the proportioning valve 5 3 4 Tip the block assembly forward and the Figure 7 rear valve shaft with spring should fall out 5 3 5 Insert a 1 8 hex wrench into the center of the rear seat within the block unscrew and remove it from the block 5 3 6 Unscrew the valve shaft
36. t by removing the Philips screws 2 per side Earlier style covers may also require any side output fittings to be removed using 34 wrench refer to 5 9 5 2 Balancing Chambers 5 2 1 Using 5 32 hex wrench remove the four screws from the i top of the Balancing Chambers N and separate the two chambers PRINo10 io from the lower block of blender 5 2 2 NOTE Spring and ball will be loose when cap is removed Using a spanner wrench remove the caps from each side of one of the di chamber assemblies 5 2 3 Remove the ball and spring Figure 5 from each side and set aside 5 2 4 Remove the o rings from the caps and also the o rings from the bottom of the chamber halves and dispose of these 5 2 5 Using the 5 32 hex wrench again remove the two screws from both sides of the chamber separate the two halves and remove and discard the diaphragm 5 2 6 Clean the chamber halves with alcohol paying particular attention to the ball seats 5 2 7 To reassemble lay one of the halves down on a flat surface with the diaphragm cavity facing up Place the new diaphragm on top and center it within the cavity 5 2 8 Place the other half on top of the first half diaphragm cavity down 5 2 9 Thread two screws into the side facing you far enough to hold the pieces together but not so tight as to capture the diaphragm The diaphragm will need to be further aligned 5 2 10 With the chamber assembly input output or
37. t these steps as many times as necessary until all points are within 396 full scale 20 AIR 50 PSI 0 50 PSI Calibration Setup BLENDER OXYGEN ANALYZER FLOW TESTER 60 0 OOeo FLOW VALVE Figure 18 6 3 CALIBRATION VERIFICATION 6 3 6 3 6 3 6 3 6 3 1 Connect 50 psi Air and Oxygen supplies to their respective inputs on the blender Tee into each of these supply lines a pressure gauge so that pressures can be accurately set and monitored 2 Connect the blender output to a flow valve capable of passing more than120 LPM a flow measurement device and an oxygen analyzer per the manufacturer s instructions 3 Turn on supply pressures simultaneously 4 Setthe knob to 21 and 100 and verify the concentrations as indicated by the analyzer are 20 8 23 and 98 100 respectively If these conditions are not met then it may be possible to make minor adjustments by repositioning the knob on the shaft To do this remove the knob turn the shaft to meet the specification in question and replace the knob on the shaft against the stop pin Be aware that any change in the knob shaft relationship will affect both ends of the scale If it is not possible to bring both ends into specifications by this method then it will be necessary to perform the calibration steps in the sections preceding this one The aforementioned steps should be done with the blender set up with air a
38. to the validity of CE mark claims Warning Because this is a CE marked device it must never be modified without prior expressed written consent from Bio Med Devices 29 12 SPECIFICATIONS Ohio Medical s line of blenders delivers accurate FIO mixtures from either one or two outlet ports and has an overall standard flow range of 2 120 LPM They can be used with ventilators nasal cannulas mask CPAP and resuscitation bags By adding an additional side port to the standard model three outlet ports are able to provide combined flows from 2 100 LPM allowing it to power three items at once The Low Flow version of the blender provides flows from 3 to 30 LPM with no gas bleed CAUTION Do not use in a room unless the blender has been built by Ohio Medical to be used for such an environment This will be indicated by MRI on the blender Oxygen Range 21 to 100 Oxygen Accuracy 3 of full scale Supply Pressure 30 75 psi 207 517 kPa Air amp oxygen must be within 10 psi 69 kPa of each other Maximum Flow 2120 LPM 230 LPM Low Flow blender 60 setting amp 50 psi 345 kPa inlet pressures Standard Flow Ranges refer to table in Section 2 Custom Configuration Flow Ranges refer to addendums and table in Section 2 Pressure Drop 6 psi 42 kPa at 50 psi 345 kPa inlet pressure and 40 LPM flow 10 LPM Low Flow blender Alarm Bypass Reset when inlet gas pressure differential is 26 psi 42 kPa Alarm
39. used To return the flowmeter and bleed to its off inactive state return the flowmeter to its angled position by pushing it in and rotating it counterclockwise towards the front 3 1 INTRODUCTION AND OPERATION The Ohio Medical Air Oxygen Blender is a precision proportioning device for mixing medical grade air and oxygen to any concentration from 2196 to 10096 oxygen and delivering it to a variety of respiratory care devices The blender uses source air and oxygen at a pressure of 50 psi connected to two 0 5 5 fittings on the bottom of the blender Each fitting has a built in 30 micron particulate filter The gas source then passes through a duckbill check valve which prevents reverse gas flows from either source WARNING The factory installed Air and Oxygen gas supply fittings which contain essential check valves and filters must not be substituted with any other parts not approved by Bio Med Devices Doing so may cause gas supply contamination due to back flow The blender uses a two stage balancing system with the gas entering into each stage to equalize the operating pressure of the gas sources before entering the proportioning stage The gases then flow into the proportioning stage where they are mixed to the percentage dialed in on the front panel knob This stage has a double ended valve with valve seats on either end Each one of these valve seats controls the passage of the air or oxygen to the outlet of the blender There are u
40. v 18 JSN OIL Sv d SI NOLIWWHOINI SHOW HOS S318N3SSV 8 SLHVd 1 353340 NIVLNOO SNOLLVHNDSISNOOD 4N34343 0 TWH3N39 SI M3IA ILON LYOddNS 1OV1NOO N amp XM L 7 A8 031VOIONI 2 3108 33S Dam FHV Wd NI S1HVd 08v ld LIM HOS 8002 LHVd 3040 ASSY H38INVH2 ONION VB 27 28 10 BLENDER WARRANTY The Ohio Medical warranty lasts for one year from date of purchase This warranty covers parts and labor Shipping costs are covered up to six months from date of purchase This warranty is limited to defects in parts and workmanship Ohio Medical will not be held responsible for misuse or abuse of the product All service must be done by Ohio Medical or an authorized service representative of Ohio Medical Ohio Medical will not be held responsible for unauthorized service work on any blender 11 CE MARK The CE mark displayed on this product signifies that this device is in compliance with the European Medical Devices Directive Council Directive 93 42 EEC As a prerequisite for the CE mark Bio Med Devices operates under an ISO 13485 compliant quality system covering the design and manufacture of medical devices The four digit code underlying the CE mark 0086 pertains to Bio Med s Notified Body the British Standards Institute whose function is to investigate and attest
41. y pressure 6 5 DUCK BILL CHECK VALVE WARNING The factory installed Air and Oxygen gas supply fittings which contain essential check valves and filters must not be substituted with any other parts not approved by Bio Med Devices Doing so may cause gas supply contamination due to back flow 6 5 1 Remove anything previously connected to all blender outputs 6 5 2 Leave the air supply connected to the supply source and to the blender 6 5 3 Disconnect the oxygen supply hose from the supply source but leave the other end connected to the blender 6 5 4 Insert the free end of the oxygen supply hose into a vessel of water 6 5 5 Turn on the air supply source 6 5 6 No bubbles should be observed If there are bubbles then replace the oxygen fitting check valve refer to 5 6 6 5 7 Repeat for the air supply side If the air supply side fails then replace the air fitting check valve refer to 5 7 VS 7 PERFORMANCE CHECK Before placing the blender into service the following should be checked for proper operation When taking readings from the analyzer be sure to wait long enough for it to stabilize 7 1 7 2 7 3 24 7 5 7 6 77 7 8 7 10 7 11 Connect 50 PSI gas supply to the supply fitting and no supply to the air fitting Turn on the supply The reverse flow of gas from the air inlet fitting should not exceed 10ml h 0 01667 l min Perform the same procedure with air to the air fittin
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