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Section 7.

Communication with the MQTT protocol

The LI-7815 Trace Gas Analyzers can communicate with devices using the Message
Queuing Telemetry Transport (MQTT) protocol. MQTT is a machine-to-machine
communication protocol that supports many programming languages, described at
github.com/mqtt/mqtt.github.io/wiki/libraries. The instrument uses the Eclipse Mos-
quito, an open source MQTT broker.

Here we provide basic examples that describe how to read data from the instrument
in a terminal program, send and receive calibration information in a terminal pro-
gram, and how to save data to a computer using a simple script written in the
Python language. These tutorials are for novice users.

Terminology

Here we provide a simple summary of terminology used in MQTT. These terms are
described in greater detail by other online resources.

l

Server:

The Trace Gas Analyzer is a server that sends information.

l

Client:

The computer or device that is receiving information. The server (e.g.,

Trace Gas Analyzer) can communicate with any client device that is configured
to run an acceptable programming language.

l

Broker:

Software that mediates communication between the server (Trace Gas

Analyzer) and client (your computer or data logger).

l

Topic:

A collection of information that the servers sends.

l

Subscribe:

A client's request for a topic; the client subscribes to a topic. When

subscribed, the publisher sends that topic to the client.

l

Publish:

The act of sending a topic to a client.

7-1

LI-7815 CO₂/H₂O Gas Analyzer

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Содержание LI-7815

Страница 1: ...LI 7815 CO2 H2O Trace Gas Analyzer Instruction Manual...

Страница 2: ......

Страница 3: ...and Canada envsales licor com Regional Offices LI COR Biosciences GmbH Siemensstra e 25A 61352 Bad Homburg Germany Phone 49 0 6172 17 17 771 envsales gmbh licor com LI COR Biosciences UK Ltd St John s...

Страница 4: ...patents pending in the U S and other countries Printing History Copyright 2019 LI COR Inc All rights reserved Publication Number 984 17415 Created on Tuesday October 5 2021 Notes on Safety This LI CO...

Страница 5: ...uired to correct the interference Waste Electronic and Electrical Equipment WEEE Notice This symbol indicates that the product is to be collected separately from unsorted municipal waste The fol lowin...

Страница 6: ...ntation goes to press As a result small inconsistencies between the documentation and the instrument may be present Updates to this document as well as application notes technical literature videos th...

Страница 7: ...e batteries 2 2 External power source 2 3 Connecting with the instrument 2 4 Connecting over wireless 2 5 Connecting over a wired network 2 6 Enabling and Disabling Wi Fi 2 7 Instrument display 2 8 St...

Страница 8: ...12 Operating information 4 13 Layouts 4 14 Thresholds 4 15 Export 4 15 Section 5 Troubleshooting Connection problems 5 1 Request to connect to instrument network rejected by Android OS 5 1 Request to...

Страница 9: ...minal program 7 2 Streaming data into the interface 7 3 Setting the zero calibration 7 4 Setting the span calibration 7 5 Rebooting the instrument 7 6 Powering off the instrument 7 6 Basic commands wi...

Страница 10: ...viii...

Страница 11: ...d stores in its internal memory CO2 dry mole fractions in air corrected for both the spectroscopic interferences and dilution due to H2O See Measurement overview on page A 1 for a brief summary of OF...

Страница 12: ...and the optional DC power cable part num ber 9968 242 See Power options on page 2 2 Warning Use the safety approved power cord supplied with the instrument The instru ment power supply is equipped wi...

Страница 13: ...ng Lithium ion batteries may cause environmental damage or damage to human health if they are disposed of improperly Do not dispose of the batteries in unsorted municipal waste or an incinerator Many...

Страница 14: ...grounded outlet Do not defeat the purpose of the grounding type plug Do not place the instrument where the power cord will be walked on or exposed to water or chemical spills Avertissement Utilisez l...

Страница 15: ...nal accessories In addition to the items already mentioned the analyzer may include the following accessories Auxiliary power cable Part Number 9968 242 This optional component allows you to power the...

Страница 16: ...with the backpack kit l Close the clasps and tighten the straps so that the instrument is secure l Do not block the vents or set the instrument in standing water l If you are unable to lift the backp...

Страница 17: ...nt Upon powering on the instrument will issue a series of status codes as it completes the start up cycle The pump will start running when the optical bench approaches 55 C If starting from room tempe...

Страница 18: ...equired to power the instrument The instrument supports hot swapping meaning that you can remove a partially depleted battery and replace it with a charged one and measurements will not be disrupted a...

Страница 19: ...m ber only Use of another battery may present a risk of fire or explosion Keep away from children Avertissement Ne rechargez les batteries qu avec un chargeur conforme au SMBUS niveau 2 ou 3 Ne chauff...

Страница 20: ...t will not charge the batteries Not powered through the universal power adapter 9968 232 4 Power Red 2 Power Black Ground 6 Power Black Table 2 1 Pin assignments for the connector and power cable Figu...

Страница 21: ...strument l Dynamic IP address on the display panel if the network cable is connected l Fixed IP address of 192 168 10 1 if the internal Wi Fi is enabled 3 Press Enter to connect If you are unable to c...

Страница 22: ...t is on a network by displaying the network icon and the network assigned IP address If your local network also has Wi Fi you can connect to the instrument over the wire less network 2 Enter the hostn...

Страница 23: ...e previous page 1 Click Options Settings 2 Click the Wi Fi tab 3 Set Wi Fi to Off or On 4 Click Update to apply the setting If you click away from the page without first clicking Update the setting wi...

Страница 24: ...twork cable is installed between the instrument network port and a port on a local area network l Wi Fi Status When Wi Fi is enabled indicated by the symbol the instru ment broadcasts a Wi Fi network...

Страница 25: ...l RMS too high Measurements are invalid Red 64 Unregulated pressures or temperatures Measurements are invalid Red 128 Inlet clogged Triggered when the inlet is obstructed for 3 or more seconds When tr...

Страница 26: ...ithin 3 seconds In sleep mode the instrument will power off the pump but maintain power to the heat ers Sleep mode is to silence the pumps if for example you want to hear the birds singing while you w...

Страница 27: ...ere provided with the instrument or scotch tape to keep dust from the filter Position the foam pad over the inlet and outlet wrap the instru ment with plastic wrap place it in a large plastic bag and...

Страница 28: ...ntity 1 2 are classified as UN3480 packing instruction 965 section II and require l Not declared as Dangerous Goods l One or two batteries l Shipper s Declaration Quantity and type of packing Packing...

Страница 29: ...if the package s is damaged l If package is damaged in transport it must not be loaded until the condition of the contents can be verified The batteries contained in the package must be inspected for...

Страница 30: ...Section 2 Getting started 2 14 LI 7815 CO H O Gas Analyzer...

Страница 31: ...phase adjuster and is exhausted through the air outlet In the optical bench the pressure is drawn down to about 40 kPa When the instrument is powering down air is circulated in a closed loop through...

Страница 32: ...finger tight For metal and plastic tubing tighten it an additional 1 turns if you are connecting the tube for the first time For plastic tube that is highly pliable insert a stainless steel tube inse...

Страница 33: ...een ambient and 35 kPa 5 PSI above ambient If the pressure is higher than that install a 30 cm vent in the sample line to ensure that air from the external pump does not pressurize the analyzer The ve...

Страница 34: ...escribed in Com munication with the MQTT protocol on page 7 1 Downloading a data file To retrieve data from the instrument click Options Export Specify a date range and time period Dates are displayed...

Страница 35: ...lumns and one called DATAU which gives the units for the corresponding columns DATAH DATAU Description SECONDS secs Seconds past the universal epoch Unix time NANOSECONDS nsecs Nanoseconds of the seco...

Страница 36: ...eject corrupted data lines Time data and diagnostics The time data and diagnostics are given under the header The relationship between Unix Epoch time and the time stamp The instrument measures time b...

Страница 37: ...61 cm 13 by 24 with 18 cm 7 of vertical clearance The instrument dimensions are given in Figure C 1 on page C 3 Be sure that the vents on the sides are not obstructed Allow 2 to 3 cm 1 inch of clearan...

Страница 38: ...Section 3 Applications of the LI 7815 3 8 LI 7815 CO H O Gas Analyzer...

Страница 39: ...ettings in the gas analyzer Here you can view graphs of data download recorded data configure the display and alter instrument settings Home page When you first connect to the instrument it will displ...

Страница 40: ...ean one fully charged battery or two half charged batteries Check the charge gauge on each battery or the instrument display to determine which is depleted Wi Fi and network status information see Wi...

Страница 41: ...raph Range Seconds Click Reset to restore the default range of 300 seconds Click to display the entire history of measurements of this variable Click to hide or show anomaly stripes to indicate when a...

Страница 42: ...Section 4 Software overview 4 4 LI 7815 CO H O Gas Analyzer...

Страница 43: ...for update instructions The Language setting is configured under software settings The interface can be dis played in English Spanish and simplified Chinese languages The language setting is retained...

Страница 44: ...at all times to prevent clock drift When selected the instrument will set its clock according to the local network time When not selected you must enter the desired time manually The Auto Sync option...

Страница 45: ...NTP or PTP clocks If Auto Sync is disabled or the instrument is not online expect the clock to drift up to several seconds per month or more Time zone Here you can select a time zone that applies an...

Страница 46: ...use some thing like 172 24 1 nn where the values represented by nn are octets that uniquely identify this instrument on the network l Subnet Mask Typically 255 255 255 0 l Default Gateway Set the fir...

Страница 47: ...for com munication over the wireless network When there are many Wi Fi networks avail able in one location you can assign a specific channel for a more reliable connection LI 8100 A Under Settings LI...

Страница 48: ...date that the span was set Last the span value Weight the multiplier that is set when you span the CO2 measurement and the CO2 Concentration ppb entered in the previous span Do not change the settings...

Страница 49: ...Normal operation is indicated by green bubbles An exclamation point inside one or more bubbles indicates that the instrument is not in a normal operating state Typically these are displayed when the i...

Страница 50: ...thin the green part of the dial l Cavity Pressure is measured in the optical cavity The instrument operates around 40 kPa typically If the values are colored red that indicates that the instrument is...

Страница 51: ...e is the optical bench temperature If red the instrument is either too hot and unable to regulate the cavity temperature or too cold and in a warmup state Normally this is between 52 C and 58 C l Lase...

Страница 52: ...Layouts You can customize the graphical layout If for example you are only interested in viewing CO2 measurements you can select a layout that displays one gas and then select the gas of interest 4 14...

Страница 53: ...cate if the measurement is outside of the threshold on the graph with anomaly stripes click Hide Show Anomaly Stripes and the status by color coding the reported values You can change the colors by cl...

Страница 54: ...Section 4 Software overview 4 16 LI 7815 CO H O Gas Analyzer...

Страница 55: ...by a warning similar to The network has no internet access Stay connected Select Yes l The exact procedure may vary depending upon the device manufacturer l The web browser may continue to try to res...

Страница 56: ...Section 5 Troubleshooting To resolve it tap the information icon next to the device network and disable the Private Network setting 5 2 LI 7815 CO H O Gas Analyzer...

Страница 57: ...he internal plastic electronics shroud It has a very small connector that plugs into the circuit board Power off the instrument remove the cover screws and lift the cover slightly to see if the antenn...

Страница 58: ...ution LI 78xx 172 24 1 1 Same IP address the last set of octets must be different Change PC IP address to 172 24 1 2 PC 172 24 1 1 Device IP Address Issue Potential Solution LI 78xx 172 24 1 1 Differe...

Страница 59: ...that indicate problematic pres sure measurements see Status codes on page 2 9 Clear the constriction and the instrument should return to normal operation in a few minutes Restart the instru ment if it...

Страница 60: ...inese If you need to change the language setting click Options Settings The language setting is stored in the web browser Any time you connect with a browser for the first time or clear your browser c...

Страница 61: ...is an issue with the sys tem See Status codes on page 2 9 for details on the codes Code 128 triggered Code 128 is triggered if the inlet is obstructed This can happen if the instrument has drawn wate...

Страница 62: ...Section 5 Troubleshooting 5 8 LI 7815 CO H O Gas Analyzer...

Страница 63: ...lope the m in y mx b The zero is a spectral baseline Adjusting the zero changes every measurement the relationship is non linear Adjusting the span changes the slope Calibration gases should be at a p...

Страница 64: ...r or the analyzer will not initialize properly 1 Power on the instrument and let it warm up 2 Plumb a gas to the air inlet as shown in Figure 6 1 on the previous page Set the pressure between ambient...

Страница 65: ...ent and 35 kPa 5 PSI above ambient Observe the measurements on the home screen until they have stabilized The slope will be near zero 3 Span the analyzer Under Options Calibration CO2 Span enter the c...

Страница 66: ...thread locking compound which will make them difficult to remove 3 Remove the O rings the filter support disks and the filter Use a toothpick to work them out 4 Inspect the O rings and replace them if...

Страница 67: ...in coughing and or sore throat PROLONGED OR REPEATED EXPOSURE TO DUST MAY CAUSE PULMONARY PROBLEMS INGESTION MAY CAUSE GASTRIC DISTURBANCES Advertissment Peut causer une irritation PEUT CAUSER UNE IRR...

Страница 68: ...acket of silica gel beads in the accessories kit 7 Fill the column with fresh silica gel beads There may be a little more than is needed Dispose of the extra silica gel beads 8 Reassemble the filter a...

Страница 69: ...ter applic ation and install it on your computer Windows only Launch the application It will display a list of all LI 7810 LI 7815 and LI 7820 instruments on your network The instrument that you want...

Страница 70: ...Section 6 Maintenance 6 8 LI 7815 CO H O Gas Analyzer...

Страница 71: ...These tutorials are for novice users Terminology Here we provide a simple summary of terminology used in MQTT These terms are described in greater detail by other online resources l Server The Trace...

Страница 72: ...inal program The instrument can be controlled from a terminal program macOS or command prompt program Windows With trace gas analyzers that means you can set the zero and span calibrations read the ca...

Страница 73: ...quitto_sub h 172 24 82 41 t licor niobrara output concentration l mosquitto_sub launches the application to subscribe l h specifies a host the Trace Gas Analyzer followed by the instrument IP address...

Страница 74: ...ed by the instrument IP address l 172 24 82 41 is the IP address You can also enter the host name Both are given on the instrument display l t specifies that you want to subscribe to a topic l licor n...

Страница 75: ...he IP address You can also enter the host name Both are given on the instrument display l t specifies that you want to subscribe to a topic l licor niobrara system CO2_Span is the topic and hierarchy...

Страница 76: ...reboot This initiates the restart cycle beginning with a purge of the optics Powering off the instrument To power off the instrument send the following command mosquitto_pub h 172 24 82 41 t licor nio...

Страница 77: ...m will issue a few replies as it completes the installation Now your computer should have all of the files needed to communicate with the instrument Configuring paho mqtt in Mac or Linux Although Mac...

Страница 78: ...r mid str granted_qos def on_message client userdata msg msg str msg payload print msg client paho Client client on_subscribe on_subscribe client on_message on_message client connect 172 24 82 41 1883...

Страница 79: ...ting success 2 Create the python script to save the data Copy the following into a text file and save it to your computer s desktop or another directory with a py extension like import datetime py imp...

Страница 80: ...datetime timedelta minutes 30 change the value 30 to the number of minutes you want E Set the directory to save the data In with open C User s User Name Documents flnm wb specify the directory 4 Start...

Страница 81: ...er and optical bench that is tied to a pressure control mechanism Changing the pressure of that volume alters the refractive index which subsequently modifies the phase of the laser The instrument ram...

Страница 82: ...to normalize the measured signal Absorption is computed at each resonance mode by comparing the normalized sample photodiode signal with the reference photodiode signal The concentration of each gas i...

Страница 83: ...s ou l ex cution des proc dures autres que celles sp cifi es ici peuvent entra ner une exposition dangereuse aux radiations The LI 7815 is certified as a Class I laser product No hazardous radiation i...

Страница 84: ...dditional safety information Figure B 1 The Class 1 laser safety label is affixed to the back of the case Figure B 2 The laser radiation safety label is inside the instrument case B 2 LI 7815 CO H O G...

Страница 85: ...er Frequency mHz Upper Frequency mHz 1 2401 2412 2423 2 2406 2417 2428 3 2411 2422 2433 4 2416 2427 2438 5 2421 2432 2443 6 2426 2437 2448 7 2431 2442 2453 8 2436 2447 2458 9 2441 2452 2463 10 2446 24...

Страница 86: ...our local regulations to determine how to safely dispose of the batteries Advertissment Les batteries lithium ion peuvent causer des dommages l environnement ou endommager la sant humaine si l on se d...

Страница 87: ...ove the four screws that secure the electronics shroud Being careful to avoid straining the Wi Fi antenna it is glued to the shroud move the shroud to the side The battery is near the middle of the in...

Страница 88: ...Appendix B Additional safety information B 6 LI 7815 CO H O Gas Analyzer...

Страница 89: ...perating conditions Sample Line Humidity 0 to 99 9 non condensing Operating Pressure Range 70 to 110 kPa Connectivity Ethernet and Wi Fi not available in some countries Wi Fi Compatibility 2 4 GHz 802...

Страница 90: ...0 T90 2 seconds from 0 to 400 ppm Range 0 to 10 000 ppm Precision 1 0 10 ppm at 400 ppm with 1 second averaging 0 04 ppm at 400 ppm with 5 second averaging Maximum Drift 0 2 ppm per 24 hour period H2O...

Страница 91: ...Figure C 1 LI 7815 dimensions Clearance is required for the power cable and tubing as well as 2 to 3 cm around the case vents Appendix C Specifications C 3 Appendix C Specifications...

Страница 92: ...Appendix C Specifications C 4 LI 7815 CO H O Gas Analyzer...

Страница 93: ...ged by act of God or other casualty 4 The purchaser whether it is a DISTRIBUTOR or direct customer of LI COR or a DISTRIBUTOR S cus tomer packs and ships or delivers the instrument to LI COR Inc at LI...

Страница 94: ...pply whether included by this contract or by law are limited to the time period of this warranty which is a twelve month period commencing from the date the instrument is shipped to a user who is a cu...

Страница 95: ...rature 4 13 channels Wi Fi B 3 Chinese language 4 5 5 6 connecting 2 4 local area network 2 6 wireless 2 5 connecting a sample 3 3 connecting an air supply 3 2 connection issues 5 3 5 3 D data retriev...

Страница 96: ...ard error message 2 9 serial number 2 8 set IP address automatically 4 7 settings 4 11 shipping batteries 2 11 labels 2 11 shipping the instrument 2 11 size C 3 software updating 4 5 software interfac...

Страница 97: ......

Страница 98: ...al Offices LI COR Biosciences GmbH Siemensstra e 25A 61352 Bad Homburg Germany Phone 49 0 6172 17 17 771 envsales gmbh licor com LI COR Biosciences UK Ltd St John s Innovation Centre Cowley Road Cambr...

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