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MIXCHEK  

Introduction 

 Teledyne 

Analytical 

Instruments 

11 

Introduction 

The Teledyne 

MIXCHEK

 is a dedicated instrument designed to 

accurately monitor the composition of a gas during mixing or cylinder 
filling operations. A LCD mounted on the front panel of the instrument 
displays the percentage of helium and oxygen during the mixing 
operation.  

There are two basic configurations available both of which offer 

oxygen analysis as an option. The wall-mountable unit is housed in an 
enclosure equipped with a window for viewing the helium and oxygen 
displays.  It is powered by a plug-in 6V DC adapter which uses a 
conventional 120VAC source (100-240 VAC 50/60 Hz optional).  

The portable instrument is housed in a rugged high-impact plastic 

watertight enclosure. It has a molded-in handle for easily transporting the 
instrument to the mixing or process area. Both models, the standard wall-
mount and the portable instrument, use corrosive-resistant materials where 
applicable for enhanced durability in salt air or spray environments. The 
wall-mount model is shown in Figure 1-1 and the portable instrument is 
shown in Figure 1-2.  

NOTE:

 If your unit is equipped with a Helium only analysis please ignore all 

references to the oxygen sections of this manual.  

1.1  Overview 

The 

MIXCHEK

 analyzes the helium/oxygen concentrations in a gas 

mixture using a dedicated two-channel sensor network sharing a common 
sample system. The gas to be monitored is drawn into the analyzer and 
passed to the sensor network. A high output micro-fuel cell oxygen sensor is 
used to determine the oxygen concentration of the gas mixture. The output of 
the micro-fuel cell is fed to the display and read out as percent oxygen. 

The sample gas is then directed to a thermal conductivity sensor. This 

sensor provides a signal that is proportional to the difference in conductivities 
between the components of the gas mixture. A microprocessor compares the 
sensor output to data contained in an onboard chip and converts the raw data 
into a linearized signal that is sent to the helium LCD display. 

Summary of Contents for Mixchek

Page 1: ... and functioning properly Suffocation or other fatal respiratory complications can result from improperly calibrated or malfunctioning equipment Oxygen accelerates combustion Do not use this instrument around open flames and combustible gases liquids or solids Only authorized personnel should conduct maintenance and or servicing Before conducting any maintenance or servicing consult with authorize...

Page 2: ...us and to make any alterations in the dimensions shape or weight of any parts in so far as such alterations do not adversely affect our warranty Important Notice This instrument provides measurement readings to its user and serves as a tool by which valuable data can be gathered The information provided by the instrument may assist the user in eliminating potential hazards caused by his process ho...

Page 3: ...d Electromagnetic Interference RFI EMI protection MIXCHEK MCWHE Wall mountable instrument with view window for helium analysis MIXCHEK MCWHEO2 Wall mountable instrument with view window for helium and oxygen analysis MIXCHEK MCPHE Battery operated portable instrument for helium analysis MIXCHEK MCPHEO2 Battery operated portable instrument for helium and oxygen analysis Optional AC to DC Adapter Po...

Page 4: ...ry and or damage the instrument CAUTION HOT SURFACE WARNING This warning is specific to heated components within the instrument Failure to heed the warning could result in serious burns to skin and underlying tissue WARNING ELECTRICAL SHOCK HAZARD Dangerous voltages appear within this instrument This warning is specific to an electrical hazard existing at or nearby the component or procedure under...

Page 5: ...our new analyzer Please read this manual and keep it available Occasionally some instruments are customized for a particular application or features and or options added per customer requests Please check the front of this manual for any additional information in the form of an Addendum which discusses specific information procedures cautions and warnings that may be peculiar to your instrument Ma...

Page 6: ...ing the Analyzer Wall Mount Unit 15 2 3 Installing the Oxygen Sensor 16 2 4 AC Power Connections 18 2 5 Battery Test Portable Model Only 20 2 6 Battery Installation Portable Model Only 20 2 7 Calibration 21 Operation 25 3 1 Operation Start up 25 3 1 1 Powering Up 25 3 1 2 Setting the O2 Span 25 3 1 3 Attaching the Sample Gas 25 Maintenance 27 4 1 Micro Fuel Cell Replacement 27 4 1 1 Storing and Ha...

Page 7: ...MIXCHEK Teledyne Analytical Instruments vii Appendix 29 A 1 Specifications 29 A 2 Spare Parts List 31 A 3 Helium Air Chart 32 A 4 Material Safety Data Sheet 36 Index 37 ...

Page 8: ...1 Mounting Dimensions 16 Figure 2 2 Removing the Front Panel 17 Figure 2 3 Installing the Sensor 18 Figure 2 4 Power Adapter Port Wall Mount 19 Figure 2 5 Power Adapter Port Portable Model 19 Figure 2 6 Battery Installation 21 Figure 2 7 Typical Sample System with Calibration 24 Figure 3 1 Typical Setup Flow Diagram 26 Figure 4 1 Battery Disposition 28 ...

Page 9: ... can pose a suffocation risk The customer must eliminate the possibility of displacing atmospheric air with helium or nitrogen at or near the instrument during the mixing or analysis process The customer must also ensure that the principles of operating this equipment are well understood by the user Misuse of this product in any manner tampering with its components or unauthorized substitution of ...

Page 10: ...MIXCHEK Teledyne Analytical Instruments x BLANK ...

Page 11: ...e resistant materials where applicable for enhanced durability in salt air or spray environments The wall mount model is shown in Figure 1 1 and the portable instrument is shown in Figure 1 2 NOTE If your unit is equipped with a Helium only analysis please ignore all references to the oxygen sections of this manual 1 1 Overview The MIXCHEK analyzes the helium oxygen concentrations in a gas mixture...

Page 12: ...struments 12 Accuracy is maintained to 1 across the entire 0 100 analysis range He or O2 of the instrument at constant temperature 25 C at constant pressure atmospheric Figure 1 1 Wall mountable MIXCHEK Figure 1 2 MIXCHEK Portable Configuration ...

Page 13: ... the art long life 36 month R 33D1 oxygen Sensor Optional Convenient span calibration control for calibrating the oxygen cell ABS enclosure for wall mounting rugged water resistant plastic housing for portable model Low pressure power inflator hose sampling adapter 1 3 Options Oxygen analysis AC DC adapter to power either unit using 120VAC power AC DC adapter for universal power 100 240 VAC with 4...

Page 14: ...Introduction MIXCHEK Teledyne Analytical Instruments 14 Other applications include Oxygen analysis in He N2 or air gas environment Gas purification and air liquefaction process control ...

Page 15: ...e Check that the sensor is not leaking and that there is no sign of physical damage 2 2 Mounting the Analyzer Wall Mount Unit The MIXCHEK is designed to mount and operate in a general purpose area only The instrument is not designed to accept or handle hazardous gases CAUTION USING OR MONITORING OXYGEN LEVELS ABOVE ATMOSPHERIC COMPOSITION 20 9 CAN BE HAZARDOUS WHILE OXYGEN IS NOT COMBUSTIBLE OR EX...

Page 16: ...CCESS PORT IS EXPOSED Mount the instrument so that it does not restrict or cause the sample return line to kink The sample return port must not be restricted and must be vented at atmospheric pressure Figure 2 1 Mounting Dimensions 2 3 Installing the Oxygen Sensor The R 33D1 high output micro fuel cell oxygen sensor is packed separately from the analyzer and must be installed in the unit prior to ...

Page 17: ...Y FLUSH EYES WITH WATER FOR AT LEAST 15 MINUTES CALL PHYSICIAN SEE APPENDIX MATERIAL SAFETY DATA SHEET 1 Discharge any static electricity build up by touching any piece of grounded metal such as plumbing fixtures not the instrument 2 Remove the 4 cap nuts that secure the front panel See Figure 2 2 Figure 2 2 Removing the Front Panel Portable unit uses acorn nuts and washers 3 Rotate the front pane...

Page 18: ...lock clockwise 6 Replace the front panel Figure 2 3 Installing the Sensor Portable model shown wall mount is similar 2 4 AC Power Connections Instrument power for the standard wall mountable model is supplied by a 6VDC power adapter that is plugged into the side of the analyzer as shown in Figure 2 4 ...

Page 19: ...portable unit can also be powered using the optional 6 VDC power adapters P N A558 US or A555 CE When using the adapter insert the jack into the port on the side of the front panel near the ON OFF BATT TEST switch as shown in Figure 2 5 This figure also shows the internal pressure vent port which allows the instrument to vent and return to atmospheric pressure before the lid is opened Figure 2 5 P...

Page 20: ...e accuracy of this instrument 2 6 Battery Installation Portable Model Only Before using the portable model for the first time 4 C cell batteries must be installed Note Do not use rechargeable batteries This type of battery does not provide the required voltage to power the instrument To install the batteries remove the 2 screws securing the battery compartment lid Lift out the compartment cover an...

Page 21: ...gen reading drops slightly This is due to the oxygen sensor consuming the oxygen inside the sample block thereby reducing the oxygen level The oxygen cell has zero output when there is no oxygen present therefore the oxygen channel is automatically zeroed For span calibration it is usually more convenient to calibrate the oxygen analyzer with compressed air from a cylinder Air has oxygen content o...

Page 22: ...analyzer Span Calibration oxygen sensor 1 Adjust the flow rate of the air source to 0 2 2 SLPM prior to attaching it to the gas inlet of the analyzer 2 When the oxygen display reading stabilizes approximately 1 minute adjust the oxygen display to read 20 9 using the O2 Span control on the front panel To calibrate the helium analyzer The helium analyzer will typically provide 1 accuracy or better f...

Page 23: ...ucing negative readings The display is incapable of displaying negative values and will read zero even if the potentiometer is turned additionally after the zero point is approached Span Calibration helium sensor Note The span is set using the helium display 1 Attach the 100 helium gas to the sample inlet and adjust the flow to between 0 2 and 2 0 SLPM 2 While helium is purging the sample line wat...

Page 24: ...Setup MIXCHEK Teledyne Analytical Instruments 24 Figure 2 7 Typical Sample System with Provisions for Calibration ...

Page 25: ... If the helium sensor is replaced then calibration of the helium sensor is required Refer to Section 2 7 for calibrating the helium sensor The oxygen section however must be calibrated before use It should be calibrated each day prior to use To calibrate the unit turn the instrument on and let it operate for 30 seconds Make sure that the analyzer is exposed to flowing air and then adjust the O2 SP...

Page 26: ...isplay reading should become stable in less than a minute Most of the time required for the analyzer s reading to stabilize is caused by gas sampling propagation delays This is the time required for the gas sample to purge through the regulators gas lines and fittings Depending on the sample system employed it may require several minutes for the gas sample to reach the analyzer and become stable F...

Page 27: ...is exhausted its output will fall off and will no longer be able to hold calibration To remove and replace the micro fuel cell see Section 2 3 4 1 1 Storing and Handling Replacement Cells To have a replacement cell available when it is needed TAI recommends that one spare cell be purchased after commissioning the instrument shortly before the end of the cell s two year warranty period The spare ce...

Page 28: ...Maintenance MIXCHEK Teledyne Analytical Instruments 28 Figure 4 1 Battery Disposition ...

Page 29: ...xygen 0 100 helium in oxygen and or nitrogen Accuracy O2 1 2 counts at constant temp pres He 1 at constant temp press O2 5 2 counts at const press over operating temp range 0 40 C equilibrated He 4 at const press over operating temp range 0 50 C equilibrated Resolution O2 0 1 He 0 1 0 2 Response Time 90 in less than 5 seconds Display 3 1 2 Dual LCD AC Power Standard 6 VDC power adapter powered fro...

Page 30: ...Warranty 24 months O2 Sensor Expected Life 36 months in air Enclosure Wall Mount ABS plastic housing Portable Water resistant polyethylene Dimensions Wall Mount 6 2 L x 5 9 W x 3 7 D in 157 5 x 149 9 x 94 0 mm Portable 8 7 L x 7 5 W x 3 8 D in 221 x 190 5 x 96 5 mm Storage Temp 0 to 50 C Operating Temp 0 40 C Humidity Environmental 95 non condensing max Pollution Degree 2 Over Voltage Category 1 ...

Page 31: ...e sampling adapter 2 SLPM 1 P1244 Trim Pot Tool 1 A75813 300DIN Tank Sampling Adapter Kit ____________________ A minimum charge is applicable to spare parts orders Note Orders for replacement parts should include the part number if available and the model and serial number of the instrument for which the parts are intended Orders should be sent to TELEDYNE Analytical Instruments 16830 Chestnut Str...

Page 32: ... and that the flow rate does not exceed 2 SCFH during any phase of the testing After the oxygen section is calibrated it will become the standard for checking the helium section The only other concern is that the flow rate does not exceed 2SCFH Low flow rates do not typically cause an issue but it should be noted that the oxygen sensor does consume oxygen If the gas is not flowing the oxygen readi...

Page 33: ...ample adapter is a convent method to sample the gas cylinders at the correct flow rate To use this system the regulator is first attached to the air cylinder to calibrate the oxygen section set the span to 20 9 The next step is to sample each of the other cylinders The results are compared to the Air Helium chart The most important issues are Accurately calibrating the oxygen analyzer using air to...

Page 34: ...1 08 96 0 84 46 11 29 95 1 05 45 11 50 94 1 25 44 11 70 93 1 46 43 11 91 92 1 67 42 12 12 91 1 88 41 12 33 90 2 09 40 12 54 89 2 30 39 12 75 88 2 51 38 12 96 87 2 72 37 13 17 86 2 93 36 13 38 85 3 14 35 13 59 84 3 34 34 13 79 83 3 55 33 14 00 82 3 76 32 14 21 81 3 97 31 14 42 80 4 18 30 14 63 79 4 39 29 14 84 78 4 60 28 15 05 77 4 81 27 15 26 76 5 02 26 15 47 75 5 23 25 15 68 74 5 43 24 15 88 ...

Page 35: ...1 6 06 21 16 51 70 6 27 20 16 72 69 6 48 19 16 93 68 6 69 18 17 14 67 6 90 17 17 35 66 7 11 16 17 56 65 7 32 15 17 77 64 7 52 14 17 97 63 7 73 13 18 18 62 7 94 12 18 39 61 8 15 11 18 60 60 8 36 10 18 81 59 8 57 9 19 02 58 8 78 8 19 23 57 8 99 7 19 44 56 9 20 6 19 65 55 9 41 5 19 86 54 9 61 4 20 06 53 9 82 3 20 27 52 10 03 2 20 48 51 10 24 1 20 69 ...

Page 36: ...Appendix MIXCHEK Teledyne Analytical Instruments 36 A 4 Material Safety Data Sheet Consult Teledyne for a copy of the MSDS sheet for this product or visit our website at www teledyne ai com ...

Page 37: ...ro fuel cell installation See sensor installation microprocessor 11 13 Mixchek 12 Mixchek portable 12 model information iii mounting dimensions 16 MSDS 36 negative readings 23 NEMA 12 enclosure 16 O2 SPAN control 25 operation 25 oxygen sensor 13 pony tank 33 potassium hydroxide 17 power adapter 11 13 18 19 29 power requirements 29 power switch 13 pressure vent port 19 propagation delays gas sampli...

Page 38: ...Index MIXCHEK Teledyne Analytical Instruments 38 ...

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