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Model 405 nm NO

2

/NO/NO

x

Monitor Manual Rev. D

37

Figure 10.6. Back of Instrument

RS-232
Serial Port

12-V Power In

Air Inlet, ¼-in

Use PTFE, PFA
or Other Inert
Tubing Only

Exhaust Gas

BNC Analog
Output, 0-2.5 V

Cell Flow
Rate
Adjustment

Room Air
Inlet for O

3

Generator

Ozone Flow
Rate
Adjustment

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Summary of Contents for 405 nm

Page 1: ...tor Manual Rev D i NO2 NO NOx Monitor 2B Technologies Inc OPERATION MANUAL Model 405 nm Copyright 2016 2B Technologies Inc All rights reserved Technical Support www twobtech com techsupport techsupport twobtech com 1 303 273 0559 ...

Page 2: ...ENU 11 4 1 Menu Tree 12 4 2 To Start Logging Data 13 4 3 To Stop Logging Data 14 4 4 To Transmit Logged Data 15 4 5 To Average Data 15 4 6 Instrument Configuration 16 4 7 To Set the Time and Date 16 4 8 Calibration Parameters Overview 16 4 9 To Set the NO2 and NO Calibration Parameters 17 4 10 To Set the Flow Meter Slopes 18 4 11 To Change the Output Baud Rate 18 4 12 To Change the Analog Output S...

Page 3: ...tion Procedure 26 7 2 1 Instrument Preparation 26 7 2 2 Measurement of Zero Air 27 7 2 3 Measurement of NO2 and NO Standards 27 7 2 4 Calibration Curve 27 8 PERIODIC ZERO AND SPAN CHECKS 28 9 TROUBLESHOOTING 29 10 INSTRUMENT LAYOUT 32 11 WIRING CONNECTIONS 38 12 SPARE PARTS 39 13 SERVICE LOG 40 Appendix A Using the 2B Technologies Display and Graphing Software 42 ...

Page 4: ...tor Manual Rev D iv IDENTIFICATION RECORDS Record the following information for future reference Unit serial number ______________________________________ Warranty start date _______________________________________ date of receipt ...

Page 5: ...ions of the text Revision A December 2013 Revision B February 2014 Revision C May 2015 Revision D serial number 1021 and above June 2016 TRADEMARKS PATENTS 2B Technologies 2B Tech 2B NO2 NO NOx Monitor and Model 405 nm are trademarks of 2B Technologies Inc CONFIDENTIALITY The information contained in this manual may be confidential and proprietary and is the property of 2B Technologies Inc Informa...

Page 6: ...ease click on the Ticket link provided to continue to communicate with us directly over the internet The web ticket approach to customer service allows us to better track your problem and be certain that you get a timely response We at 2B Tech pride ourselves on the excellent customer service we provide You may also contact us by email at techsupport twobtech com or by phone at 1 303 273 0559 In e...

Page 7: ...present In no event shall 2B Technologies be liable for incidental or consequential damages in connection with or arising from the use of this manual and its accompanying related materials Warranty is valid only for the country designated on the 2B Technologies quote or invoice Safety Warning The Model 405 nm NO2 NO NOx Monitor is designed to use an internal generator of ozone O3 to oxidize NO to ...

Page 8: ... 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 Inc USA vorgeschrieben und im Handbuch beschrieben betrieben wird können die im Gerät eingebauten Schutzvorrichtungen beeinträchtigt werden ITALIANO ATTENZIONE Qualsiasi i...

Page 9: ...main differences are the use of 405 nm light for NO2 in place of 254 nm light for O3 and a much longer path length of 2 meters vs 15 30 cm for ozone to compensate for the much lower absorption cross section of NO2 The long path length is achieved by use of a cell with a tubular design that provides low volume and rapid gas exchange Nitric oxide is measured by measuring the light intensities with a...

Page 10: ... Scrubber Valve once every 5 seconds allows the measurement of a light intensity in the absence Io of NO2 and presence I of NO2 The Beer Lambert Law is then used to calculate the concentration of NO2 from I and Io 𝑁𝑂2 1 𝐿𝜎 𝑙𝑛 𝐼𝑜 𝐼 Here L is the path length 2 1 m and σ is the absorption cross section 6 06 10 19 cm2 molec 1 for NO2 averaged over the light emitting diode LED emission centered on 405 ...

Page 11: ...tio The cell pressure is displayed and logged in units of either torr or mbar and the cell temperature in units of either C or K In principle the measurement of NO2 by absorbance at 405 nm requires no external calibration it is an absolute method However factors such as variability in the LED peak emission wavelength and band width and non linearity of the photodiode and amplifier response can res...

Page 12: ...ts rapid changes in concentration the filter reduces the averaging to only 4 samples or 20 seconds to allow the analyzer to respond more quickly Two conditions must be simultaneously met to switch to the short filter First the instantaneous concentration must differ from the average in the long filter by at least 40 ppb Second the instantaneous concentration must differ from the average in the lon...

Page 13: ... optional micro SD Drive Concentration Units ppb pphm ppm Pressure Units mbar torr Temperature Units C K T and P Corrected Yes Operating Temperature Range 10 to 50 C Operating Altitude 0 30 km 30 1000 mbar Power Requirement Battery or 110 220 VAC Power Pack 11 14 V dc or 120 240 V ac 1 3 A at 12 V 16 watt Max 2 5 A at 12 V 30 watt warmup Size Rackmount 17 w x 14 5 d x 5 5 h 43 x 37 x 14 cm Weight ...

Page 14: ...y adjusted are Cell Flow Rate 1400 1800 cm3 min The cell flow rate of sample gas and ozone air through the reactor volume and optical cell Ozone Flow Rate 60 80 cm3 min The flow rate of ozone air mixed into the sample flow stream These flow rates are adjusted to be in the ranges specified above at the factory However due to changes in altitude and thus pressure the two flow rates need to be verifi...

Page 15: ...o minutes may be spurious with large positive and negative swings due to the warmup of the light emitting diode LED and electronics Also measurements may be inaccurate during the first 10 20 minutes required for the LED photodiode and internal temperature of the absorption cell to stabilize 3 4 Connections and Setup 1 Attach the sample inlet line to the SAMPLE inlet port The pressure of the sample...

Page 16: ... by correcting the data at a later time The instrument also has an Auto Zero function The instrument can be programmed to periodically measure and apply new zero offsets for NO2 and NO using an internal NOx scrubber 3 6 Collecting Data from the Analog Output The data may be logged in real time using a data logger attached to the BNC analog output The range of the analog output is 0 2 5 V The outpu...

Page 17: ...cal data line might read 67 4 44 2 111 6 5 8 30 3 980 6 1576 76 2 1 2743 1 0151 110 2 12 10 15 18 31 27 80 where NO2 67 4 ppb NO 44 2 ppb NOx 111 6 ppb NO2_zero 5 ppb NO_zero 8 ppb Cell temperature 30 3 C may be expressed in K if chosen from menu Cell pressure 980 6 mbar may be expressed in torr if chosen from menu Cell volumetric flow rate 1576 cc min O3 volumetric flow rate 76 2 cc min Sample ph...

Page 18: ...requency Section Reference Measure and adjust cell flow rate and ozone flow rate before operating instrument restart instrument after adjustment of flows Whenever the instrument s location changes in altitude 3 2 Allow 20 minutes for instrument warmup before taking data Each startup 3 3 Inlet tubing should be made of inert materials such as PTFE PFA FED PVDF do not use Tygon polypropylene or metal...

Page 19: ... may be selected A blinking cursor will show across the D of the Dat submenu The Select switch may be rotated clockwise or counterclockwise to move the cursor under the first letter of one of the other submenus To select a particular submenu move the cursor under the first letter of the submenu and click press in the Select switch To exit the Main Menu and begin making measurements again select an...

Page 20: ...tor Manual Rev D 12 4 1 Menu Tree The following diagram summarizes the complete menu Main Menu Dat Zer 1h 5s 5m Log End Xmt D T Flow 1m T P NOx NO2 Bdr Hrs Vout Cell_Flw O3_Flw Mod Unt I O Cal Cfg Avg NO NO2 NO NO2 NO Dur Frq LED ...

Page 21: ... Yes by moving the cursor under Yes and clicking Either selection will return you to the Dat Menu To start data acquisition select and click to return to the main Menu and the select to begin making measurements When measurements resume the display might read NO2 34 8 ppb LOG 193 0 Tsc 112 14 49 04 07 2015 where the NO2 or NO is the most current measurement of that species LOG is the current log n...

Page 22: ...ument is in the logging mode logging will resume after power is restored A note of Data Interrupt will be written to the logger prior to writing the first new data line In the case of a power failure a data line may be lost because the microprocessor writes to the logger memory in groups of two lines All data residing only in the volatile memory of the microprocessor are lost when power is interru...

Page 23: ...sadvantage of HyperTerminal is that it has a 500 line buffer limit However all programs may be used to log an unlimited number of data lines to a file on your computer For more details see our Tech Note 007 here http twobtech com tech_notes TN007 pdf Hold down the Select switch to obtain the Main Menu Go to the Dat submenu by clicking on Dat Next click on Xmt The message Logged Data will be writte...

Page 24: ...orrect click on the Select switch to turn off the blinking cursor You may now rotate the Select switch to choose another numeral to change Once the time and date is correct clicking on will set the internal clock to that time and return the display to the Cfg menu As in setting a digital watch the seconds should be set in advance of the real time since the clock starts to run again only when the s...

Page 25: ... leak obstruction of air flow or a contaminated NO2 or NOx scrubber but it also can be adjusted Once the zero of the instrument is corrected the slope may be adjusted so that the instrument readout agrees with a standard NO2 or NO source or with the readout from another instrument whose calibration is considered to be accurate To adjust the calibration slope and zero offset calibration parameters ...

Page 26: ...ments are critical to the performance of the instrument one is the cell flow rate and the other is the ozone flow rate Do NOT change these settings unless you contact 2B Technologies To change the flow meter slope sensitivity calibration parameters access the Flow submenu Flow Cal Menu Cell_Flw O3_Flw Selecting the Cell_Flw submenu allows you to change the slope calibration parameter for the cell ...

Page 27: ...ntration in this case is 250 ppb and 1 ppb will provide an output of 10 mV You can use the Select switch to change the scaling factor to the value of your choice by selecting and changing the individual digits in the scaling factor A click on returns the display to the I O menu 4 13 To Read the Number of Hours of Monitor Use The instrument keeps track of the total number of hours of use This is he...

Page 28: ...less averaging is involved this is not equal to the overall precision of the instrument it is a diagnostic test of LED fluctuations The LED test also measures and outputs the voltage levels of the photodiode detector Vs For best performance the photodiode voltage Vs should be in the range 0 5 2 0 volts For detector voltages less than about 0 5 volts the data may be noisy due to insufficient light ...

Page 29: ...the LCD and through the serial port depending on what averaging frequency is selected 5 sec 1 min 5 min or 1 hr 4 17 Auto Zeroing The Model 405 nm is equipped with an Auto Zeroing valve to sample air drawn through a NOx scrubber The frequency and duration of the Auto Zeroing function can be set via the display or by entering the serial menu as described in Section 5 4 17 1 Zero Duration The durati...

Page 30: ...t data e End logging N Set the current mode to measure Nitric Oxide G Set the current mode to measure Nitrogen Dioxide B Set the current mode to measure both NO2 and NO Z Force a zero h Output the serial header If the letter m is sent as a command measurements will stop and menu will be displayed in the terminal emulator window When the serial menu is accessed the instrument is no longer making me...

Page 31: ...aptive filter Short Average number of points h Output the serial header Output this help menu x Exits the serial menu Status Byte The current measurement mode can be determined from the status byte in each serial data line The following describes all combinations of the status byte and the corresponding measurement mode 80 Measuring NO2 and NO 10 Measuring NO2 20 Measuring NO 81 Measuring NO2 and ...

Page 32: ...2B Tech website The complete list with links may be found at www twobtech com downloads_tech_notes htm These Tech Notes are continuously updated and new ones created Also please note that all 2B Tech instrument manuals are posted online at http www twobtech com downloads htm For your convenience a Service Log which may be printed is provided at the end of this manual for recording calibrations rep...

Page 33: ...ption in the cylinder and on gas handling equipment When concentration standards are required NO2 and NO concentrations are generated by diluting a high concentration NO mixture and converting a fraction of the NO to NO2 via the gas phase titration reaction with ozone The depletion of NO measured by the Model 405 nm provides the calibration for NO and the appearance of NO2 provides the calibration...

Page 34: ...ed for general cleanliness For more information refer to the manufacturer s User Manual for the calibrator 7 2 Calibration Procedure A multipoint calibration should be performed at least every 12 months Within this calibration frequency a multipoint calibration is advised whenever major disassembly of components is performed or any time the zero or span checks give results outside of the acceptabl...

Page 35: ...table response is measured and record the average responses 7 Generate several other ozone concentrations to produce other concentrations of NO2 and NO At least 4 concentration standards are recommended over the range of interest 8 For each concentration record the responses of the Model 405 nm 9 Turn off the ozone generator and continue to produce the NO concentration used during the calibration ...

Page 36: ...ms in the monitor are leaks contamination of the DewLineTM Nafion tubing a contaminated valve or contamination in the optical setup See the Troubleshooting section of the manual Section 9 8 Enter the calibration menu Main Menu Cfg Cal in the instrument software and set the calibration parameters 8 PERIODIC ZERO AND SPAN CHECKS To ensure the quality of the monitor data periodic zero and span checks...

Page 37: ...ded in Section 12 at the end of this manual Table 9 1 Troubleshooting the NO2 NO NOx Monitor for performance problems Problem Symptom Likely Cause Corrective Action Instrument does not turn on Power not connected properly or circuit breaker open Power cable not connected to circuit board Check external power connection for reverse polarity or a short and wait a few minutes for the thermal circuit ...

Page 38: ...er and reconnect cable between analog output and circuit board Check and reset analog output scaling factor in the Menu Select switch does not work Cable not properly connected between Select switch and circuit board Remove top cover and reconnect Select switch cable to circuit board Serial port does not work Cable not properly connected between serial 9 pin connector and circuit board Wrong seria...

Page 39: ...ace As a first check hold your finger over the air inlet to determine whether air is being drawn in If there is flow measure the flow rate by removing the top cover and attaching a high conductance flow meter to the exit port of the pump Air flow should be greater than 1 4 L min If flow is lower check for leaks If there are no leaks replace air pump Instrument always reads close to zero for NO2 co...

Page 40: ...STRUMENT LAYOUT Figure 10 1 Top view of Model 405 nmNO2 NO NOx Monitor with cover removed Cell Flow Meter Pulse Dampener LED Power Board Power Board DewLineTM Nafion Tubing Sample Air Pump DBNOx Printed Circuit Board LED Assembly PD Assembly Optical Bench ...

Page 41: ...Bottom view of NO2 NO NOx Monitor with top cover removed and heater cover removed Reactor Coil Photolytic Ozone Generator Ozone Lamp Inverter Heated Scrubbers O3 Flow Meter O3 Solenoid Valves Exhaust Gas Scrubbers NOx Solenoid Valves O3 Generator Inlet Scrubber ...

Page 42: ...essure Sensor Serial Output 12 V Power To Board Display Analog Output Sample Photodiode Microprocessor 5 Volt Regulator Select Switch Clock Battery Temperature Sensors Valves LED Power Power for O3 Generator Flow Meters Ozone Generator Photodiode Relay Control Out Heater Reactor Bypass Valve ...

Page 43: ...Model 405 nm NO2 NO NOx Monitor Manual Rev D 35 Figure 10 4 Power Board On Off Switch Line In Power Out Heater Control In O3 Generator Scrubber Heater Cell Pump ...

Page 44: ...Model 405 nm NO2 NO NOx Monitor Manual Rev D 36 Figure 10 5 LED Power Board LED Power In LED ...

Page 45: ...D 37 Figure 10 6 Back of Instrument RS 232 Serial Port 12 V Power In Air Inlet in Use PTFE PFA or Other Inert Tubing Only Exhaust Gas BNC Analog Output 0 2 5 V Cell Flow Rate Adjustment Room Air Inlet for O3 Generator Ozone Flow Rate Adjustment ...

Page 46: ...e Main DBNOx J18 Black Zero Valve Main DBNOx J15 Yellow Black Cell Flow Main DBNOx J32 Red Blue Black Ozone Flow Main DBNOx J9 Red Blue Black O3 Generator Photodiode Main DBNOx J4 Red Blue Black Green LCD Main DBNOx J10 Rainbow Ribbon Cell Temperature Main DBNOx J6 Red Orange Green Scrubber Temperature Main DBNOx J38 Red Orange Green Sample Photodiode Main DBNOx J29 Red Blue Black Green Select Swi...

Page 47: ...Ox solenoid valve the Model 405 uses 3 of these OZVLV405 Ozone solenoid valve the Model 405 uses 2 of these NOXDSP405 4 line LCD display and cable LEDASSEMBLY405 LED assembly PDASSEMBLY405 Photodiode assembly and cable NOXBRD405 DBNOx printed circuit board SCRBOZINT405 Ozone scrubber for ozone generator inlet SCRBEXHST405 Exhaust scrubbers two in series DEW DewLine Nafion tubing SERCABL Serial por...

Page 48: ...Model 405 nm NO2 NO NOx Monitor Manual Rev D 40 13 SERVICE LOG Date Calibrated Cleaned New NOx Scrubber New Pump New LED Other ...

Page 49: ...Model 405 nm NO2 NO NOx Monitor Manual Rev D 41 Date Calibrated Cleaned New NOx Scrubber New Pump New LED Other ...

Page 50: ... and Download Software Follow the instructions doing the two installations if needed and choosing to save the setup exe file Double click the setup exe download to launch the 2B Data Display application Connecting Devices Connect to a 2B Technologies Monitor 1 Select the device you are connecting to from Settings Select Device 2 Click OK 3 Select the Connection you will be using from Settings Conn...

Page 51: ...rieve Weather Data from the Weather Link menu A window will appear and the software will try to retrieve the weather station data If the connection is good weather data will be displayed in the window If not an error message will appear Try a different com port if the error message appears You may move this window so it is out of the way or you may close it The weather data is updated every 5 seco...

Page 52: ...ates Receiving and no data appear in the Data Grid or the Charts click on the Buffer tab to view the serial data If the correct device is not selected no data will be displayed in the Data Grid or the Charts but data will be displayed in the Buffer window Saving Data Saving Data to a txt File 1 Click the Start button in the Instrument Data Section to begin collecting data from the instrument 2 A w...

Page 53: ... press Open 1 NOTE To view weather data you must open the corresponding CSV file 4 Choose the correct device associated with the file a If you are unsure open the file in a text editor or Excel to determine which device Serial Commands The menu commands are the same as given elsewhere in this manual ...

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