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Introduction

The

FireStingGO2

is a hand-held fiber-optic oxygen meter based

on the established

FireSting

technology featuring:



broad oxygen sensor portfolio (micro- and minisensors, robust
probes, sensor spots, flow-through cells, respiration vials)



sensors for the full and the trace oxygen range



measurements in water as well as in the gas phase



automatic temperature and pressure compensation



proven

REDFLASH

technology

with New Features:



integrated high contrast LCD display



integrated rechargeable battery and memory



extremely low power consumption for long-term logging

and Operation Modes:



stand-alone via intuitive LCD user interface



with Windows PC via USB

Содержание FireStingGO2

Страница 1: ...1 Pocket Oxygen Meter FireStingGO2 MANUAL www pyroscience com ...

Страница 2: ...ger software version 1 0 The FireStingGO2 is manufactured by PyroScience GmbH Hubertusstr 35 52064 Aachen Germany Phone 49 0 241 518322 10 Fax 49 0 241 518322 99 Email info pyroscience com Internet www pyroscience com Registered Aachen HRB 17329 Germany ...

Страница 3: ... 13 3 2 STAND CLAMP 13 3 3 USER INTERFACE 14 3 4 OPERATION MODES 15 3 4 1 Live Mode 15 3 4 2 Menu Mode 15 3 4 3 Logging Mode 15 3 4 4 Standby Mode 16 3 4 5 PC Mode 16 3 5 STATUS LINE 16 4 QUICK START 18 4 1 GETTING STARTED 18 4 2 SETTINGS AND OPTIONS ADJUSTMENTS 18 4 3 SENSOR CALIBRATION 18 4 4 LIVE MEASUREMENTS 19 4 5 DATA LOGGING 19 4 6 DATA MANAGEMENT AND INSPECTION 19 5 LIVE MODE 20 5 1 TOP SC...

Страница 4: ...Temperature Offset 29 6 4 3 Device Info and Reset Device 29 6 5 ADVANCED MENU 30 7 DATA LOGGING 31 7 1 START LOGGING 31 7 1 1 Manual Logging 31 7 1 2 Continuous Logging 32 7 2 LOGGING MODE 33 8 STANDBY MODE 35 9 PC MODE 35 10 FIRESTINGGO2 MANAGER 36 10 1 SOFTWARE INSTALLATION 36 10 2 OPERATION WITHOUT CONNECTED DEVICE 36 10 3 OPERATION WITH CONNECTED DEVICE 36 10 3 1 Live Graph Window 37 10 3 2 Se...

Страница 5: ...2 CALIBRATION STANDARDS 59 12 1 THE AIR CALIBRATION STANDARD 59 12 1 1 Ambient Air 61 12 1 2 Water Vapor Saturated Air 61 12 1 3 Air Saturated Water 61 12 2 THE 0 STANDARD 62 12 2 1 Water Mixed with a Strong Reductant 62 12 2 2 Nitrogen Gas 63 13 APPENDIX 64 13 1 SPECIFICATIONS OF THE FIRESTINGGO2 64 13 2 MEASURING PRINCIPLE 65 13 3 DEFINITION OF OXYGEN UNITS 66 13 4 EXPLANATION OF THE SENSOR CODE...

Страница 6: ...espiration vials sensors for the full and the trace oxygen range measurements in water as well as in the gas phase automatic temperature and pressure compensation proven REDFLASH technology with New Features integrated high contrast LCD display integrated rechargeable battery and memory extremely low power consumption for long term logging and Operation Modes stand alone via intuitive LCD user int...

Страница 7: ...year With this flexibility oxygen measurements can be performed independent of a PC at different locations using the broad range of fiber optic oxygen sensors from PyroScience The FireStingGO2 impresses by its compactness functionality and extremely low power consumption allowing for long term logging without the need of recharging The handling of the FireStingGO2 is intuitive and all information ...

Страница 8: ...be kept and stored outside the reach of children in a secure place under dry and clean conditions at room temperature avoiding moisture dust corrosive conditions and heating of the instrument This device and the sensors are not intended for medical military or other safety relevant areas They must not be used for applications in humans not for in vivo examination on humans not for human diagnostic...

Страница 9: ...processing and data publication is on the user s authority When used in the field the environmental conditions like high humidity dust exposure to direct solar radiation may cause damage or interference of the FireStingGO2 which is on the user s authority Before using the oxygen meter FireStingGO2 and its sensors read carefully the available instructions and user manuals ...

Страница 10: ...ap Prevent mechanical stress to the fragile sensing tip and injuries with needle type sensors Avoid strong bending of the fiber cable Calibration and application of the sensors data acquisition treatment and publication is on the user s authority The sensors and the oxygen meter FireStingGO2 are not intended for medical diagnostic therapeutic or military purposes or any other safety critical appli...

Страница 11: ...pocket oxygen meter FireStingGO2 3 1 Ports and Integrated Sensors The FireStingGO2 has three ports and one integrated sensor micro USB port for charging and communication oxygen port for connecting a fiber optic oxygen sensor temperature port for connecting a temperature sensor internal air sensor for pressure and relative humidity ...

Страница 12: ...oxygen port and turn the bayonet coupling gently clockwise until the plug is locked firmly 3 1 3 Temperature Port Temperature sensors 4 wire PT100 sensors with LEMO connectors are connected to the temperature port by simply pushing the connector into the port Please refer to the website of PyroScience concerning available temperature sensors The temperature sensor can be used for automatic tempera...

Страница 13: ... logging data or while it is in the PC mode see below If the device does not switch on by pressing the OK button the integrated battery needs to be recharged For this connect the USB port of the FireStingGO2 to any standard micro USB charger or to any available computer USB port with the included USB cable Typically the battery is fully recharged within ca 2 hours 3 2 Stand Clamp The FireStingGO2 ...

Страница 14: ...n is generally used for going back e g in menus or for cancelling an operation Alternatively the lower left corner of the display might show a context specific function e g CANCEL BACK or STOP If pressed for 10 seconds a hardware reset of the device can be performed Up and Down Buttons The context specific functionality of these buttons is always indicated by small black triangles or in the displa...

Страница 15: ...he Live Mode by pressing the OK button The menu is used for adjusting the settings performing sensor calibration starting data logging accessing diverse options After exiting the menu mode with the BACK button the device reverts to the Live Mode For details on the menu mode refer to chapter 6 3 4 3 Logging Mode The Logging Mode is started by selecting Start Logging in the main menu and pressing th...

Страница 16: ...evice enters the PC Mode This is indicated by the PC symbol in the upper right corner of the display Here the Menu Mode is not accessible only the sub screens are accessible with the UP and DOWN buttons For more details on the PC mode refer to chapter 9 3 5 Status Line In all modes except for the Menu Mode the status line is shown in the upper line of the display The battery symbol indicates the a...

Страница 17: ...intensity It provides important information on the actual condition and remaining lifetime of the connected oxygen sensor Potential warnings Low Signal No Signal Too High Bad Ref regarding problems with the oxygen sensor signal are displayed at the position of the bar graph For more details about trouble shooting these warnings refer to chapter 11 Do not continue with measurements if a warning is ...

Страница 18: ...ure used for the temperature compensation of the oxygen measurements Sensor or Fixed If applicable adjust the sample Salinity 4 3 Sensor Calibration For details refer to chapter 6 3 Open the Calibration Menu in the main menu and review if the correct Sensor Code was adjusted Prepare appropriate air and 0 calibration standards Open Calibrate Air and select the type of temperature compensation used ...

Страница 19: ...the Main Menu Choose the appropriate mode Manual for manual logging i e data points are logged each time the OK button SAMPLE is pressed Continuous for automatized logging with adjustable Logging Interval and Logging Duration The logged data are displayed numerically and graphically on several sub screens If the data logging is finished EXIT the Logging Mode with the BACK button 4 6 Data managemen...

Страница 20: ...it see chapter 6 2 3 is shown as well as the compensation temperature sensor or fixed see chapter 6 2 4 5 2 Sub screen 1 Here the sensor code and the dates of the last Calibrations are shown see chapter 6 3 5 3 Sub screen 2 This sub screen shows details on the Environment including the readings of the temperature sensor if connected and of the internal air sensor including the air pressure mbar an...

Страница 21: ...ollowing settings have to be adjusted in the Settings Menu 6 2 1 Sensor Code The Sensor Code written on the label attached to the sensor or on the stickers bags of contactless sensors must be entered every time a new oxygen sensor is connected Enter this sensor code by moving the cursor with the BACK and OK buttons and by adjusting each letter number with the UP and DOWN buttons Press OK after the...

Страница 22: ...o be adjusted This is important in order to assure a correct temperature compensation of the oxygen measurement Select Sensor for enabling automatic temperature compensation based on temperature measurements of the connected PT100 temperature sensor chapter 3 1 3 In order to ensure proper automatic temperature compensation position the temperature sensor in the sample so that it measures the same ...

Страница 23: ...connected oxygen sensor needs to be calibrated before the measurements Note that the top screen of the Live Mode shows the warning Not Calibrated after a new Sensor Code has been entered The calibration is performed in the Calibration menu The oxygen sensor can be calibrated at two calibration points 1 at ambient air or in air saturated water Calibrate Air and 2 at 0 O2 i e anoxic conditions Calib...

Страница 24: ...ched to the sensor cable or on the bag stickers of the sensor 6 3 2 Air Calibration Select Calibrate Air for starting an air calibration Then choose the type of temperature compensation during the calibration a For automatic temperature compensation of the Calibration Temperature with the temperature sensor connected to the FireStingGO2 meter select Sensor and confirm with Ok b A Fixed Calibration...

Страница 25: ...ir sensor chapter 3 1 4 These readings are needed in order to calculate the actual oxygen partial pressure in the ambient air Therefore it is important that both the FireStingGO2 device and the connected oxygen sensor are exposed to identical environmental conditions Position the oxygen and the temperature sensor if selected close to the air inlets on the right side of the FireStingGO2 display Ens...

Страница 26: ...surements are done in aqueous samples Refer to chapter 12 1 concerning preparation of appropriate calibration standards This calibration mode will automatically read the atmospheric pressure from the internal air sensor inside the FireStingGO2 This reading is needed to calculate the actual oxygen partial pressure in the ambient air It is important that the sensor in the calibration standard is exp...

Страница 27: ... choose the type of temperature compensation during the 0 calibration a For automatic temperature compensation of the Calibration Temperature with the temperature sensor connected to the FireStingGO2 meter select Sensor and confirm with OK b A Fixed Calibration Temperature can be entered with the UP and DOWN buttons after the temperature of the calibration standard was measured e g with a third pa...

Страница 28: ... for the connected sensor type If SET 0 is replaced by out of range check or replace the calibration standard and repeat the calibration 6 4 Options Menu In the Options Menu several device and sensor parameters can be adjusted Furthermore device information can be retrieved and a reset of the device can be performed 6 4 1 Adjust Time and Date Please note that it is recommended to Adjust the local ...

Страница 29: ...the measured temperature in the top screen of the Live Mode and enter it as a negative Temperature Offset After this a new calibration of the connected oxygen sensor must be performed see chapter 6 3 Changing the temperature offset will lead to a loss of the oxygen sensor calibration 6 4 3 Device Info and Reset Device Information concerning the unique ID number of the device the number of saved lo...

Страница 30: ...data on the internal device memory 6 5 Advanced Menu The sub menu Advanced includes advanced features only for advanced users with special instructions from PyroScience It is not recommended to change these advanced parameters without the advice of PyroScience ...

Страница 31: ...nual see chapter 7 1 1 and a Continuous see chapter 7 1 2 logging mode can be selected 7 1 1 Manual Logging Select the logging mode Manual and press the OK button Now data points are logged each time the OK button SAMPLE is pressed However the top screen of the logging mode shows additionally live readings with 2s sample period These live readings are NOT logged Please refer to chapter 7 2 for a d...

Страница 32: ...months 1 year or Non Stop and press NEXT Now the logging is started Please refer to chapter 7 2 for a description of the information shown on the display during the logging In case of selecting a finite logging duration the logging is automatically finished at the end of the logging duration Now press EXIT for returning to the Live Mode In case Non Stop was selected for the Logging Duration the lo...

Страница 33: ...gged readings from the oxygen and the temperature sensor Please note if Manual Logging was selected then additionally live readings with 2s sample period are shown here But data points are only logged each time the OK button SAMPLE is pressed Progress circles next to the oxygen unit provide feedback when the next data point will be logged left progress circle and about the remaining total logging ...

Страница 34: ...as the air pressure mbar and relative humidity RH measured by the internal air sensor Sub screen 4 includes all details of the actual log file like the start of the logging Log Start with time and date the actual log File Size and Free device memory available For the Continuous logging mode additional information concerning the adjusted Logging Interval and Duration are shown as well as the Time L...

Страница 35: ...e internal device memory the FireStingGO2 meter needs to be connected to a Windows PC with the included USB cable on which the software FireStingGO2 Manager was installed see chapter 10 1 After start of the software FireStingGO2 Manager on the PC the connected FireStingGO2 meter is in the PC Mode This is indicated in the status line of the device display In the PC Mode only the UP and DOWN buttons...

Страница 36: ... 10 and min 700 MB free disk space 2 Download the installer package of the FireStingGO2 Manager software from the PyroScience homepage www pyroscience com downloads html 3 Unzip and start the installer and follow the instructions 10 2 Operation without Connected Device The FireStingGO2 Manager software can be also used if no FireStingGO2 device is connected to the PC In this case only the Log Insp...

Страница 37: ...tingGO2 Manager allows full control on the device offering most features similar to the LCD user interface of the FireStingGO2 Before starting live measurements or data logging following steps need to be done Get accustomed to the Live Graph window chapter 10 3 1 Adjust the sensor Settings chapter 10 3 2 Perform an oxygen sensor Calibration chapter 10 3 3 Perform live measurements or start Logging...

Страница 38: ...er to chapter 5 Above the oxygen value an additional bar graph and a numerical value show the so called signal intensity It provides important information on the actual condition and remaining lifetime of the connected oxygen sensor Potential warnings see chapter 11 are displayed above the bar graph If data logging is not active the warning Data are NOT logged is shown above the graph Data display...

Страница 39: ...Line Width Interpolation and Point Style the chart appearance can be changed The visible time frame of the live graph can be moved with the scroll bar below the graph With the button Move the user has the possibility to click onto the chart and move the whole area while keeping the mouse button pressed To zoom into a certain part of the graph click on the button Zoom and select a rectangular area ...

Страница 40: ... This will not affect the saved data in the log file 10 3 2 Settings Open the Settings tab to adjust the sensor settings Here the Sensor Code the Medium of the sample the Oxygen Units of the measurements and the environmental conditions including the Temperature Compensation and if applicable the Salinity psu of the sample under investigation have to be adjusted The Settings can only be adjusted i...

Страница 41: ...w the Environmental Conditions in the sample need to be defined The possible modes of Temperature Compensation during the oxygen measurements include temperature measurements in the sample with the connected PT100 temperature Sensor Alternatively the measurements can be performed with a fixed sample temperature In this case the temperature needs to be measured in the sample and entered as Fixed Te...

Страница 42: ...ommended to calibrate both calibration points However if the expected measuring range is close to one of the calibration points then a 1 point calibration might be sufficient For example if the expected measuring range in a liquid sample is 95 100 air sat then a 1 point calibration at air saturated water is typically sufficient In this case the 0 calibration is taken from the factory calibration e...

Страница 43: ...e done in aqueous samples it is advised to choose Air Saturated Water and to continue with step 2B 2A Calibration in Ambient Air Ambient air serves as a simple standard ca 20 95 O2 in dry air In order to determine the precise oxygen partial pressure in ambient air the atmospheric pressure and the relative humidity will be read automatically from the internal air sensor chapter 3 1 4 Ensure that bo...

Страница 44: ...tandard It is important that the sensor in the calibration standard is exposed to the same atmospheric pressure as the FireStingGO2 Note If using retractable needle type oxygen sensors e g OXR50 OXR230 OXR430 it is important that the sensor tip is extended when the calibration value is taken 3 Temperature Compensation Select now the mode of temperature compensation used during air calibration by c...

Страница 45: ...rded Check or replace the calibration standard and perform a new calibration 10 3 5 0 Calibration Refer to chapter 12 2 how to prepare an appropriate 0 calibration standard Click on Calibrate 0 in the Calibration tab This will open the 0 Calibration window and the Live Graph window see 10 3 1 1 Temperature Compensation Select now the mode of temperature compensation used during 0 calibration by cl...

Страница 46: ...0 OXR230 OXR430 it is important that the sensor tip is extended when the calibration value is taken 3 Wait for Steady State until the oxygen and the temperature readings are stable by observing the Live Graph window see 10 3 1 4 Calibrate by clicking on Set 0 The current oxygen sensor reading is taken for the 0 calibration and the date of the last calibration is updated in the Calibration tab Note...

Страница 47: ... can be disconnected without problems from the PC even when logging is active A typical scenario is that the device is configured and calibrated with the FireStingGO2 Manager then logging is started and the device is disconnected and deployed at the measurement location Later when the measurements are completed the device is again connected to the PC and the logged data are downloaded and inspecte...

Страница 48: ...g Interval used during the logging as 1 s 2 s 5 s 10 s 30 s 1 min 2 min 5 min 10 min 30 min 1 h 2 h or 4 h It is advised to choose this interval not unnecessarily too small in order to increase the battery run time and to avoid too large log files 4 Logging Duration only for continuous mode The logging Duration can be set to 1 min 2 min 5 min 10 min 30 min 1 h 2 h 6 h 12 h 1 d 2 d 4 d 1 week 2 wee...

Страница 49: ...e de activated and cannot be changed during the logging The Log Name the Start time of the logging and the optional Comment are now displayed in the bottom line of the Logging tab 6a Manual Logging Mode Logging of a single data point is now done manually by clicking on the button Sample A single data point is then saved to the log file and added to the graph in the Live Graph window The FireStingG...

Страница 50: ...the respective log file is automatically downloaded As soon the download is finished the logged data will be shown in the Log Inspector see chapter 10 4 1 10 3 7 Options The Options tab contains information concerning the FireStingGO2 Manager soft ware version and the connected FireStingGO2 device Device ID firmware version The Device ID is a unique identification number specific for each single d...

Страница 51: ...shing ca 1 sec of the PyroScience logo on the display of the FireStingGO2 meter The flashing of the logo can help to assign a specific FireStingGO2 Manager software window to the corresponding FireStingGO2 meter if more than one device is connected 10 3 7 3 Advanced Mode The Advanced Mode comprises advanced features only for advanced users with special instructions from PyroScience It is NOT recom...

Страница 52: ... in the main window Here the Log Files in the Device Memory of the connected FireStingGO2 meter are shown in a file list with details about the Date and Time the Log Name the Size kB and the Download status of the log files Clicking on the header of a column will sort the list alphabetically for this respective column Repeated clicking on the same column header will reverse the sorting order 10 4 ...

Страница 53: ...t only a single data file can be downloaded and that the Log Inspector automatically opens as soon the download is finished 10 4 1 2 Deleting Log Files from the Device Memory In order to delete log files from the device memory select one or multiple log files in the File tab list and click on Delete from Device Multiple log files can be selected by pressing additionally the CTRL or SHIFT buttons o...

Страница 54: ...nload folder contains the Device ID see chapter 10 3 7 which ensures that the downloaded files can be unequivocally assigned to a specific FireStingGO2 device It is advised not to change this download location especially if several devices are operated in parallel Advanced users might choose a custom download folder by clicking on Change The button Explore opens the current download folder within ...

Страница 55: ... Please note that the selected files are permanently deleted from the PC and cannot be retrieved anymore By selecting a log file in the Download Folder list the logged data for this specific log file are automatically shown in the graph visible in the right section of the Log Inspector window The header of the graph includes the Log Name the Start time of the logging and the Comment if entered bef...

Страница 56: ...s might increase the intensity of the excitation light red light flashes coming out of the oxygen port by changing the second letter of the Sensor Code details in 13 4 Low Signal Measurements are still possible with potentially decreased performance If no oxygen sensor is connected or if the sensor is broken or damaged the warning No Signal will be shown in the status line Live Display No Signal P...

Страница 57: ...ts but is not connected broken or nonfunctional the warning No T Sensor is shown in the top screen of the Live Mode device and in the Live Graph window of the FireStingGO2 Manager While this warning is active the device cannot provide any valid oxygen readings as the compensation temperature is missing for calculating the oxygen value The oxygen reading is then replaced by No measurements can be p...

Страница 58: ...tingGO2 Manager software in combination with the No T Sensor warning However the log file would still include the phase shift dphi which is the fundamental raw data measured by the FireStingGO2 If the temperature was recorded independently in parallel a re calculation of the oxygen data can performed on request ...

Страница 59: ... in closed rooms occupied by many people or e g candles combustion engines consuming oxygen So if in doubt ensure a good ventilation of the room with fresh air e g by opening a window for some minutes Furthermore the relative humidity of the air causes deviations from the ideal value of 20 95 O2 Simply speaking the water vapor in humid air replaces a fraction of the oxygen resulting in a diminishe...

Страница 60: ...ed by oxygen sensors is not the partial volume i e O2 but the partial oxygen pressure i e mbar see also appendix 11 3 So an oxygen level of e g 20 7 O2 determined as described above by a given humidity and temperature is converted internally by the software into a partial pressure of oxygen essentially by multiplying the relative oxygen level with the atmospheric pressure of e g 990 mbar 0 207 x 9...

Страница 61: ...e completely dry Wet sensor tips will cause undefined humidity levels around the sensor tips And even worse the evaporation of water drops would cool down the sensor tips causing undefined temperatures 12 1 2 Water Vapor Saturated Air Enclose wet cotton wool into a flask e g DURAN flask with a lid prepared with holes for the oxygen sensor and a temperature sensor from PyroScience Typically about 1...

Страница 62: ...tion 12 2 The 0 Standard The 0 calibration standard can be water mixed with a strong reductant nitrogen gas N2 12 2 1 Water Mixed with a Strong Reductant Fill an appropriate amount of water into a glass flask e g Duran flask with a lid prepared with holes for inserting the oxygen sensor and a temperature sensor Add a strong reductant like sodium dithionite Na2S2O4 or sodium sulfite Na2SO3 at a con...

Страница 63: ...holes for inserting the oxygen sensor and a temperature sensor Ensure that all air has been replaced by the nitrogen gas before performing the calibration Insert the oxygen sensor and the temperature sensor into the flask let it equilibrate and perform the calibration as described in chapter 5 2 3 Ensure that no ambient air enters the flask again during the calibration process Convectional gas tra...

Страница 64: ...0 nm NIR Temperature Port 1 channel for 4 wire PT100 Min Logging Interval 1 sample per second Typ Standalone Logging Time with a fully charged battery ca 1 week for 1 s log interval ca 2 months for 10 s log interval ca 6 months for 1 min log interval ca 1 year for 10 min log interv Typ Data File Size ca 100 bytes per data point External Temperature Sensors Range Resolution Precision 30 C to 150 C ...

Страница 65: ...mmobilized on the sensor tip or surface The REDFLASH indicators are excitable with red light more precisely orange red at a wavelength of 610 630 nm and show an oxygen dependent luminescence in the near infrared NIR 760 790 nm The REDFLASH technology impresses by its fast response times high precision high reliability low power consumption and low cross sensitivity The red light excitation signifi...

Страница 66: ...easing oxygen levels correspond to decreasing dphi values and vice versa As a thumb of rule anoxic conditions will give about dphi 53 whereby ambient air will give about dphi 20 for full range oxygen sensors partial pressure pO2 hPa mbar Used in gas and water For a calibrated sensor the partial oxygen pressure pO2 in units of hPa equivalent to mbar is the fundamental oxygen unit measured by the Fi...

Страница 67: ...issolved O2 concentration C µmol L Definition C µmol L A air sat 100 x C100 T P S Used in water with C100 T P S interpolation formula for dissolved oxygen concentration in units of µmol L at temperature T atmospheric pressure P and Salinity S Dissolved O2 concentration C mg L ppm Definition C mg L C µmol L x 32 1000 Used in water Dissolved O2 concentration C mL L Definition C mL L C µmol L x 0 022...

Страница 68: ...xplanation about the information included in the sensor code Example Code XB7 532 205 Sensor Type LED Intensity Amplification Pre Calibration C0 Pre Calibration C100 Sensor Type Z Oxygen Micro Minisensor normal range Y Oxygen Minisensor normal range X Robust Oxygen Probe normal range V Oxygen Minisensor trace range U Robust Oxygen Probe trace range T Oxygen Sensor Spot FTC trace range S Oxygen Sen...

Страница 69: ... 400x C0 Pre Calibration at 0 O2 dphi0 C0 10 C100 Pre Calibration at 100 O2 dphi100 C100 10 The values of the pre calibration are valid for the following calibration conditions Partial Volume of Oxygen O2 20 95 Temperature at both calibration points C 20 0 Air Pressure mbar 1013 Humidity RH 0 ...

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