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Model 408 NO Calibration Source Manual Rev. D-3

Nitric Oxide Calibration Source



Technologies

OPERATION MANUAL

Model 408

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Summary of Contents for Model 408

Page 1: ...nual Rev D 3 i Nitric Oxide Calibration Source 2B Technologies OPERATION MANUAL Model 408 Copyright 2018 2B Technologies All rights reserved Technical Support https twobtech com tech support html techsupport twobtech com 1 303 273 0559 ...

Page 2: ...ttaching the NO Calibration Source to a NO Monitor 6 4 OPERATION 7 4 1 Flw Flow Menu 8 4 2 Adv Advanced Menu 8 4 2 1 Cfg Configuration Menu 8 4 2 2 NO Nitric Oxide Menu 10 4 2 3 Zer Zero Menu 10 4 3 Reentering the Menu 10 4 4 Viewing of Flow Rates Outside of the Menu 10 4 5 Collecting Diagnostic Data over the Serial Port in Real Time 11 4 6 Cal Menu 11 4 6 1 Fm1 N2O flow cal factor 11 4 6 2 Fm2 ou...

Page 3: ...Model 408 NO Calibration Source Manual Rev D 3 iii IDENTIFICATION RECORDS Record the following information for future reference Unit serial number Warranty start date date of receipt ...

Page 4: ... February 2008 Revision D March 2015 Revision D 2 December 2017 Several corrections edits for clarification and formatting changes were made Revision D 3 November 2018 Updated schematic in Section 1 2 updated web links other minor copy edits TRADEMARKS PATENTS 2B Technologies 2B Tech 2B and NO Calibration Source are trademarks of 2B Technologies CONFIDENTIALITY The information contained in this ma...

Page 5: ...logies for repair or replacement Prior to returning the product a Returned Merchandise Authorization RMA number must be obtained from the 2B Technologies Service Department and an RMA form completed The RMA form allows us to identify the owner of the instrument and provides a return shipping address Please do not return any of the accessories power pack serial cable connecting tubing etc with the ...

Page 6: ...n and no responsibility is taken for any errors that may be present In no event shall 2B Technologies be liable for incidental or consequential damages in connection with or arising from the use of the Nitric Oxide Calibration Source manual and its accompanying related materials Warranty is valid only for the country designated on the 2B Technologies quote or invoice ...

Page 7: ...so used as a general anesthetic at concentrations up to 50 and is thus well tolerated by humans There are no known toxicological effects of N2O other than asphyxiation at extremely highly concentrations due to exclusion of oxygen N2O is not itself combustible but it strongly supports combustion of organic materials and reducing agents Contact with liquid N2O can cause frost bite due to cooling as ...

Page 8: ...HINWEIS Vor dem Öffnen des Gerätes Netzstecker ziehen WARNHINWEIS Dieses auf dem Gerät weist darauf hin dab der Anwender zuerst das entsprechende Kapitel in der Bedienungsanleitung lesen sollte WARNHINWEIS Wenn das Gerät nicht wie durch die Firma 2B Technologies USA vorgeschrieben und im Handbuch beschrieben betrieben wird können die im Gerät eingebauten Schutzvorrichtungen beeinträchtigt werden I...

Page 9: ...ntration of NO in ambient air containing the same level of humidity as the air sample to be measured The NO Calibration Source is factory calibrated against a NIST traceable standard However the calibration parameters may be changed in the menu in case the user wants to recalibrate the NO Calibration Source against a separately maintained standard i e the NO Calibration Source can be used as a tra...

Page 10: ... of the NO Calibration Source An air pump draws air in through NO and ozone scrubbers to remove any ambient NO The air flow rate is controlled by use of restrictors not shown and a needle valve that vents part of the flow and is measured by a flow meter A constant fraction of the flow bypasses the flow meter not shown so that the flow through the meter is in the range 0 1 L min The needle valve is...

Page 11: ... at wavelengths near 185 nm Measurements of the output of the photolysis chamber show that no insignificant concentration of NO2 is produced The lamp intensity at 254 nm is monitored by a photodiode and controlled by the microprocessor The photodiode voltage is calibrated against the output NO concentration Pressure within the gas stream is measured but not controlled Instead the lamp intensity is...

Page 12: ...o 60 C Relative Humidity Range 0 80 non condensing Altitude Range 0 2000 meters Power Requirements 12 V dc or 120 240 V ac 50 60 Hz 2 5 A 21 watt Size 3 7 8 5 9 5 in 9 4 21 6 24 1 cm Weight 5 2 lb 2 4 kg Ratings for Usage Indoor use only ordinary protection not protected against harmful ingress of moisture Class I Equipment grounding required for safety Installation Overvoltage Category II for Tra...

Page 13: ...out using a single cartridge The pressure inside the cartridge remains nearly constant as N2O evaporates and flows out of the cartridge The evaporation of N2O causes the N2O cartridge to cool which in turn slightly reduces the internal pressure of 50 atmospheres The Model 408 comes with an attached Portable N2O Source see photo below To use an N2O cartridge follow these steps 1 Make sure N2O flow ...

Page 14: ...E Teflon PFA or some other inert material that does not destroy NO and that does not desorb plasticizers and other organics that can contaminate the flow path The length of tubing should be kept as short as possible not more than a few feet to minimize NO loss and an unrestrictive over flow T is needed at the inlet of the NO monitor to be calibrated Tygon polypropylene which may look like Teflon a...

Page 15: ...ollowed by a prompt to open the regulator of the N2O cartridge and set the flow rate Target 60 10 N2O Flow xx x where xx x is the measured N2O flow rate At this point turn the black knob on the N2O regulator until the measured flow is 60 mL min Once the flow is in range press the black Select Switch on the front panel of the instrument When the menu appears release the Select Switch Note You may e...

Page 16: ...enu for displaying error code definitions across the LCD The user can scroll through the error code definitions by rotating the Select Switch The list of error codes and definitions can be found in Section 4 7 of this manual below Prg is a submenu for defining a programmed series of step NO concentrations Choosing Prg results in the following submenu Prg Menu Num Steps x Note In order to obtain ac...

Page 17: ...et NO concentration in ppb that is currently being used for the first step of the program You may now change the NO concentration for the first concentration step in the same way that the Time step was changed Executing will bring up the following submenu and allow you to set the target concentration for the next step Select NO Step Step 2 xxxx This process is repeated until the target concentrati...

Page 18: ...ncentration five bars The selected target NO concentration will remain in memory until the next time you change it Bear in mind that the instrument will output 20 1 000 ppb of NO reliably It is not recommended using the 408 for concentrations less than 20ppb other than zero or concentrations greater than 1000 ppb 4 2 3 Zer Zero Menu Selecting Zer from the Adv menu allows the user to produce zero a...

Page 19: ...d sheet program where it may be converted to formatted data in columns by defining delimiters such as commas and carriage returns for data manipulation and graphing For data transfer the correct settings are Baud rate 19 200 Data bits 8 Parity None Stop bits 1 Flow control None or hardware Serial data lines are output approximately once every second as follows Lamp Intensity arbitrary units Temper...

Page 20: ...that the instrument output agrees with your own nitric oxide standard You can always return the instrument to its factory calibration if desired To change the calibration factor place the cursor over the digit x you wish to change and hold in the Select Switch until the cursor blinks You may now change the value of the digit by rotating the Select Switch Once the desired value of a digit is select...

Page 21: ... D 3 13 3 1 and 2 4 Temperature out of range 312 316 K 5 1 and 4 6 2 and 4 7 1 2 and 4 8 Ratio of lamp intensity to target intensity out of range 0 96 to 1 04 9 1 and 8 10 2 and 8 11 1 2 and 8 12 4 and 8 13 1 4 and 8 14 2 4 and 8 15 1 2 4 and 8 ...

Page 22: ...ariation in response making it necessary to periodically check the calibration We recommend calibration at least annually The instrument may be returned to 2B Technologies for calibration servicing Troubleshooting If the instrument fails to operate correctly common problems can be identified and corrected using Table 5 1 next page Technical Support for Calibration and Troubleshooting For calibrati...

Page 23: ...lace air pump Display is blank or nonsense Bad connection of display to circuit board Remove top cover and reconnect display to circuit board Check solder connections to display Target temperature is never reached Absent or loose connection of temperature probe cable to circuit board Heater is burned out Remove top cover and reattach connector to circuit board Replace cartridge heater Instrument d...

Page 24: ...lection devices require a cross over cable in which pins 1 and 3 are exchanged between the two ends of the cable Use a cross over cable or additional connector that switches pins 1 and 3 Make sure that the baud rate on your data collection program e g Tera Term or Hyperterminal is set to 19200 Make sure that the com port assigned by your computer matches the com port setting in your data collectio...

Page 25: ...tion 3 of this manual for a labeled front view of the instrument Figure 6 1 Top view of NO Calibration Source with top cover removed Pump Buffer Volume N2O Flow Meter Power Switch UV Lamp Air Flow Meter Pressure Relief Valve Air Pump O3 Scrubber NO Scrubbers Photolyis Chamber VSO Valve ...

Page 26: ...ion Source Manual Rev D 3 18 Figure 6 2 Rear view of NO Calibration Source Serial Port Needle Valve to Adjust Air Flow Regulator for N2O Flow Adjustment N2O Cartridge Holder Power Switch NO Air Out N2O In Power 12 V 2 5 Amp ...

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