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MANUAL

He/O

Analyzer

HE/O

ANALYZER USER MANUAL

Date of issue: 6 March 2019

HW 2.5, FW 2.26

Authors: Adam Procháska, Jakub Šimánek, Aleš Procháska

Published by Divesoft s.r.o.

Summary of Contents for HE/02

Page 1: ...MANUAL He O2 Analyzer ...

Page 2: ...ensor 11 7 Other functions 13 7 1 Continuous analysis 13 7 2 Gas mixing solver 13 7 3 Gas mixing simulation 15 7 4 Ambient pressure 15 8 Special accessories 16 8 1 Flow regulator 16 8 2 Voltage measuring 16 8 3 Resistance measuring 17 8 4 Emergency disconnection of filling station 17 9 Set up 19 9 1 Preferences 19 9 2 Measurement units 20 9 3 Mixing of gases 21 9 4 Continual analysis 21 10 Chargin...

Page 3: ...ent 23 11 2 Oxygen sensor replacement 23 11 3 Flow adjusting 24 11 4 Disassembly of the instrument 24 12 Connecting to a computer 25 13 Defects and removal thereof 26 13 1 Error messages 26 13 2 Instrument malfunctions 27 14 Technical data 29 ...

Page 4: ... case of breathing mixes for diving the results of the analysis may not be used as confirmation of the correct mix composition In these cases the analyzer can only be used as an aid for increasing the probability that such incorrect mix composition will be detected before its use The correctness of the mix composition must be established by the technology used to prepare it The correct preparation...

Page 5: ...re not equipped with certain elements and are therefore not able to perform some functions described in the manual Hardware limitations 2 5 Full functionality 2 4 Full functionality 2 3 Lack of barometer In case the ambient pressure changes significantly a new O2 calibration is necessary 9V battery only 2 2 Lack of barometer 9V battery only LCD display limited readability in bright light 2 1 Lack ...

Page 6: ...um and oxygen and the temperature of the mix The dependence of the speed of sound on pressure is small and can be disregarded under normal atmospheric pressure At 0º C the speed of sound is approximately 970 m s in pure helium 330 m s in air and 315 m s in pure oxygen Raising the temperature by one degree increases the speed of sound by 0 175 The speed of sound in the mix is described by a non lin...

Page 7: ...hrough the helium concentration sensor From there it enters the oxygen sensor block and is expelled into the air by the mix exhaust The rated flow of the analyzed mix is 0 2 L min The analyzer is powered by a standard nine volt battery type 6F22 or by an external power supply connected to the left side The battery is accessible from the bottom by removing the two screws of the retaining cover On t...

Page 8: ...for about one second again The MENU key displays the available options The menu changes in individual measuring modes depending on the functions relevant to the applicable mode The key is used to enter the selected menu item confirm a changed value or perform the prepared action The selected menu item can also be called up by repeatedly pressing the MENU key The ESC key is used to exit the menu or...

Page 9: ...gas flow through the sampler will be slower and the measuring result will take somewhat longer to determine With the key you can suspend and by pressing it again resume measuring When measuring is suspended the last measured values remain displayed During measuring the key can be used for temporarily increasing the brightness of the display to maximum e g if the display is exposed to sunlight When...

Page 10: ... TMX 18 45 is trimix or the mixture of air oxygen and helium in this particular case containing 18 oxygen and 45 helium Heliox for instance Heliox 16 O2 is a mixture of oxygen and helium Foul Air for instance Foul Air 10 O2 is foul or vitiated air with a reduced oxygen content It cannot be mixed with gases designed for preparation of breathing mixes commonly avail able to the diver air oxygen heli...

Page 11: ...las for the calculation of END each giving different results The value displayed by the analyzer uses only one of them and is used for orientation purposes only For an actual dive it is necessary to calculate the END using the data of the specific dive and the tested formulas of your preference The following formula is used for calculation END 100 77 RHe where RHe is the relative molar concentrati...

Page 12: ...ygen However it provides more precise results during measuring Thee point calibration is recommended for measuring hypoxic mixes containing less than approximately 15 oxygen In this case the third calibration gas should be a gas with zero oxygen content i e pure helium or argon Calibration of the oxygen sensor is started by pressing the CAL key at any time during the measuring As the first step of...

Page 13: ... and voltage have stabilized however at least after ten seconds the STABLE prompt appears which means that it is possible to confirm the performed calibration using the key If the measured values change before the key is pressed the STABLE sign disappears and calibration proceeds until further steady values are attained If multi point calibration is set up then calibration according to the other g...

Page 14: ...displayed in the following order the remaining gas in the bottle added mix 1 3 the required mix For each mix the composition volume of the bottle the actual water volume of the bottle is specified and gas pressure in the bottle are specified If the volume of the gas is unlimited for instance if supplied by a compressor at a constant pressure enter the bottle volume as zero The mix composition may ...

Page 15: ... or to discharge Disch 40 5 bar Add 80 0 bar He Add 13 7 bar O2 Add 26 8 bar Air or decrease the pressure by 40 5 bars increase the pressure by 80 bars by adding helium add 13 7 bars of oxygen and 26 8 bars of air The last mode is similar but as it is designed for gravimetric filling using a chemical balance the amount of gas is specified in kilograms Disch 1 2382 kg Add 0 3392 kg He Add 0 4669 kg...

Page 16: ...mposition manually by pressing or switch to measurement mode by pressing and directly measure concrete mixture Calculation of final mixture proceed continuously and mixture constitution is displayed on last row Input values is the same as in the previous case 7 4 Ambient pressure Analyzer is equipped with a barometric pressure sensor Thanks to this device can be calibrated for the atmospheric cond...

Page 17: ...embly The regulator is connected similarly as the limiter Besides the tank valve it is possible to close off the gas output directly with the gas output cut off Warning Over tightening of the gas output cut off can damage or prematurely wear out the reduction valve seat 8 2 Voltage measuring Optional measuring cables can be attached to the analyzer to measure electric voltage After the V connector...

Page 18: ...ion of nitrox or trimix continual filling device After cable connection analyzer automatically will switch to the watch continual filling mode On last row display will display current state relay outputs in form Re 123 At shutdown some relay is his number replaced by dash for example Re 23 Standardly is measured content of O2 and He Metering is possible to extend by pressure sensor e g for pressur...

Page 19: ... power must be made expertly and in agreement with valid safety standards regulations and law Warning At power circuits and circuits connected to electric power incorrectly wiring the analyzer will be destroyed and or you risk serious injury or death by electric power ...

Page 20: ... increased to maximum if the analyzer is powered with an external power supply adapter The option O2 cell used is activated as standard When deactivating the O2 value is ignored and replaced with the value shown in the following O2 substitute parameter This option allows emergency use of the analyzer with a worn out oxygen sensor for measuring the concentration of helium In such a case the correct...

Page 21: ...ted pressure in the tank by using plug in thermometer only 9 2 Measurement units Other settings are available in Menu Measurement units Here the analyzer can be switched to metric mode Metric units imperial units mode U S units or the display of individual units can be selected separately for individual values temperature depth pressure volume mass The unit settings do not affect the calculations ...

Page 22: ...s is sufficient for ordinary use Ref temperature is the temperature of the gas used for calculations 9 4 Continual analysis Here the boundary values are set When these values are exceeded an alarm is triggered Alarm O2 low Alarm O2 high Alarm He low Alarm He high Alarm pressure low Alarm pressure high Alarm temperature low Alarm temperature high The last of the adjustable values is Delay Re1 Re2 w...

Page 23: ...nge is defined between 0 to 100 charging When the battery is close to discharged connect the charger to power supply connector When the charger is connected you can check the status of charge press If the battery is not fully charged the row of arrows is displayed on a scale from 0 to 100 If it is already charged a long double line is displayed All features of the analyzer are available during cha...

Page 24: ...your supplier vendor or service technician to change it To replace the sensor first remove the battery cover then unscrew the three screws fastening the cover of the instrument Carefully lift the cover remove the connector from the oxygen sensor and remove the sensor and the attached aluminum inlet block Warning The cover is connected to the instrument by several cables When replacing the sensor t...

Page 25: ...flowing at the desired value with 2 mm socket screw key Setting range is relatively small maximally 1 4 rev Do not more loosen the setting screw it can be released and blow out by the gas pressure Correct flow in the right adjusted sampler is 0 2 liter min Adjusting is possible verify approximately by connecting a hose to the sampler and second end immerse to a glass with water For right adjust mu...

Page 26: ...Preferences Send Data to USB On Any terminal emulation utility can be used for data reception for instance HyperTerminal is sufficient for Microsoft Windows This utility is included in the basic Windows installation The measured data are transferred in the text mode Every second the analyzer transmits data in the following format He xxx x O2 yyy y CR LF where xxx x is helium content in percent whe...

Page 27: ...rument and entered manually as a constant Menu O2 substitute n The method of displaying the measured values cannot be changed nor can oxygen sensor calibration performed Warning Oxygen sensor switched off This message is displayed every time the O2 sensor is switched off Error 3 Oxygen sensor expired The oxygen sensor is old and its output voltage is too low The measuring will be inaccurate the In...

Page 28: ...f the adapter is removed or if the battery is used the analyzer can be reactivated 13 2 Instrument malfunctions Helium content not displayed The probe measures the speed of helium in both directions If these data differ measuring is deemed incorrect and the helium content is not displayed This situation can be encountered if the measured gas flows through the probe too fast lower flow speeds are c...

Page 29: ...ossible measuring error is symmetrical and for example when measuring a mixture without any oxygen content 0 5 or 0 5 oxygen can be displayed Accordingly when measuring pure oxygen e g 99 5 or 100 5 can be displayed If the deviation is within the measuring tolerance this is not the result of a defect In the case of a greater deviation recalibrate the oxygen sensor If the problem persists replace t...

Page 30: ...Hg which corresponds to the standard atmosphere at an elevation in the range of 0 to 3000 m 0 10000 feet above sea level Rated gas throughput 0 2 L min Basis of measuring the speed of sound 800 mm Measuring frequency 2 kHz Oxygen sensor Teledyne R 22S or compatible Power source Rechargeable battery or 9V alkaline battery type 6F22 or 12V adapter DC The connection dimensions of the sampler standard...

Page 31: ...HE O2 ANALYZER USER MANUAL Date of issue 6 March 2019 HW 2 5 FW 2 26 Authors Adam Procháska Jakub Šimánek Aleš Procháska Published by Divesoft s r o ...

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