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Webinar on maintaining hvac co2 measurements the easy way
1.
© Vaisala Maintaining CO2 measurements
the easy way Webinar, 15 May 2019, Lars Stormbom and Joni Partanen
2.
© Vaisala The Speakers Webinar:
Maintaining HVAC CO2 Measurements the Easy Way 2 Joni Partanen, Product Engineer Background in process industry, automation, measurement technology and instrumentation. Lars Stormbom, Senior Product Manager With over 30 years of experience of industrial and HVAC measurements. He has a background in sensor development and testing, especially the HUMICAP® and DRYCAP® sensors. He holds a Master of Science degree in Technical Physics from the Aalto University of Espoo, Finland.
3.
© Vaisala Vaisala In
Brief We serve customers in Weather and Controlled Environment markets 80+ years of experience providing a comprehensive range of innovative observation and measurement products and services Webinar: Maintaining HVAC CO2 Measurements the Easy Way 3
4.
© Vaisala Our topics
today Why do we measure CO2 in the first place? Why CARBOCAP®? Selecting the right sensor for you Different ways to maintain the measurement Webinar: Maintaining HVAC CO2 Measurements the Easy Way 4
5.
© Vaisala Webinar: Maintaining
HVAC CO2 Measurements the 5 In an office building 90% of total costs are wages! Wages 90% Rent 9% Energy 1%
6.
© Vaisala Webinar: Maintaining
HVAC CO2 Measurements the 6 High CO2 levels impact higher mental functions
7.
© Vaisala Webinar: Maintaining
HVAC CO2 Measurements the 7 Reducing CO2 footprint
8.
© VaisalaWebinar: Maintaining
HVAC CO2 Measurements the Easy Way 8 In office building 90% of total costs are wages High CO2 Low CO2 • High productivity • Lots of fresh air introduced • Too much fresh air => higher energy consumption • Introduce outdoor polution from traffic • Low productivity • Only a little fresh air introduced • Low energy consumption Measurment
9.
© Vaisala Why CARBOCAP® Webinar:
Maintaining HVAC CO2 Measurements the Easy Way 9
10.
© Vaisala Unique inhouse
components Emitter Membrane for thermal insulation Frame Microglow Micro-Hotplate: • Stable light output • Low power consumption • >15 years lifetime Webinar: Maintaining HVAC CO2 Measurements the Easy Way 10
11.
© Vaisala Unique inhouse
components Tunable band-pass filter (Fabry-Perot): • Measurement at CO2 absorption and reference wavelength • Internal reference measurment in every cycle Webinar: Maintaining HVAC CO2 Measurements the Easy Way 11
12.
© Vaisala Unique inhouse
components Tunable band-pass filter (Fabry-Perot): • Measurement at CO2 absorption and reference wavelength • Internal reference measurment in every cycle Webinar: Maintaining HVAC CO2 Measurements the Easy Way 12
13.
© Vaisala What does
it all mean? Excellent long term stability! Webinar: Maintaining HVAC CO2 Measurements the Easy Way 13 Largest value smallest value 25% fractile Median 75% fractile Legend at 1000 ppm Specified drift: ±(15 ppm+ 2% of reading)/5 years at room conditions GM10 HVAC module
14.
© Vaisala What does
it all mean? Excellent long term stability! Webinar: Maintaining HVAC CO2 Measurements the Easy Way 14 Specified drift: ±60 ppm/year even at demanding conditions GMP252 CO2 sensor
15.
© VaisalaWebinar: Maintaining
HVAC CO2 Measurements the Easy Way 15 ”I know how often my CO2 sensors should be checked” ”I can optimize employee wellbeing AND energy consumption”
16.
© Vaisala Selecting the
right CO2 sensor for you GMW80: Standard HVAC Value for money Easy manitenance 5 year service cycle Accuracy*: ±60 ppm Webinar: Maintaining HVAC CO2 Measurements the Easy Way 16 GMW90: Demanding HVAC I need a calibration certificate I want to check and adjust myself Higher Accuracy*: ±50 ppm GMP252: Outdoor and high humidity locations Cold and hot places Internal temperature and pressure compensation Best accuracy*: ±40 ppm * At 1000 ppm CO2
17.
© Vaisala Different ways
to maintain your measurement
18.
© Vaisala Things to
consider 1. What do you need? The time between calibration/checking is detemined by your target accuracy and your quality system: In a normal office building, school, etc. a 5- year interval is usually OK. For a lab with a rigorous quality system annual calibration might be mandated. 2. What resources do you have? What is the skill level of your workforce? Can you invest and maintain reference handheld units? Webinar: Maintaining HVAC CO2 Measurements the Easy Way 18
19.
© Vaisala Different ways
to maintain CO2 sensors Webinar: Maintaining HVAC CO2 Measurements the Easy Way 19 Gas bottles: If you have a large number of devices Possible to adjust at desired CO2 level Even multipoint checks or adjustments Requires skilled workforce For frequent checks and highest accuracy requirements Certified gases with up to 0.5% accuracy Easy trimmer adjustment GMW90-series GMW90-series transmitter
20.
© Vaisala Different ways
to maintain CO2 sensors Webinar: Maintaining HVAC CO2 Measurements the Easy Way 20 Gas bottles+Calibration adapter: Possible to adjust at desired CO2 level Even multipoint checks or adjustments Requires skilled workforce For frequent checks and highest accuracy requirements Certified gases with up to 0.5% accuracy Can use intuitive, free-of-charge Vaisala PC Insight software (GMP252) GMP252, GM70 Smart GMP252 probeVaisala PC Insight software
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© Vaisala Different ways
to maintain CO2 sensors Webinar: Maintaining HVAC CO2 Measurements the Easy Way 21 Handheld Meter GM70: Good especially for checking transmitters at ambient condition A good first step: Requires knowledgeable people! Can have accredited calibration Higher uncertainty than gas bottles or spare part modules GMW90-series, GMP250 Using the Handheld GM70 Meter
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© Vaisala Plan what
you will do! How big is the difference between the handeheld and the checked sensor? What accuracy can be achieve din the field? For instance at 1000 ppm in an office environment: If the difference is small (<50 ppm) => Do nothing. If the difference is larger (50-100 ppm) => Adjust against handheld or change measurement module For even larger differences (>100ppm) => Change measurement module or send in for service Webinar: Maintaining HVAC CO2 Measurements the 22
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© Vaisala Webinar: Maintaining
HVAC CO2 Measurements the 23 Unnecessary adjustments just add noise to your measurement
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© Vaisala Different ways
to maintain CO2 sensors Webinar: Maintaining HVAC CO2 Measurements the 24
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© Vaisala Webinar: Maintaining
HVAC CO2 Measurements the 25 Exchanging CO2 modules: The easiest way to maintain your measurement No extra tools needed Doesn´t require knowledgeable people! The fastest way to do your maintenance, takes a fraction of the time per unit compared to other options GMW90-series, GMW80-series Different ways to maintain CO2 sensors
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© Vaisala Different ways
to maintain CO2 sensors Webinar: Maintaining HVAC CO2 Measurements the Easy Way 26 Factory calibration: You get the best calibration If something is wrong you can get that fixed too You get a calibration certificate Even accredited calibrations available if you quality system requires it GMP252 and GM70 Vaisala Service Center
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© Vaisala Your task
is... To figure out how accurate measurments you need Decide what this means for your checking/calibration schedule Choose a strategy for checking No matter what you choose we are here to support you: Field exchangeable measurement modules Handhelds Calibration services Webinar: Maintaining HVAC CO2 Measurements the 27
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© Vaisala Useful links
What is the impact of increased CO2 levels in indoor air on employees' cogntive skills? Learn why an IT consulting company chose Vaisala's HVAC sensors Watch webinar on How to choose the best CO2 sensors for your HVAC needs Vaisala's full HVAC offering Watch video about the CARBOCAP® technology 2019-05-15 28
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© Vaisala Thank you ..and
keep the CO2 at the right level!
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