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
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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 P​​hysics 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
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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
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In an office building 90% of total costs are wages!
Wages
90%
Rent
9%
Energy
1%

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High CO2 levels impact higher mental functions

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Reducing CO2 footprint

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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

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Why CARBOCAP®
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Unique inhouse components
Emitter
Membrane
for thermal
insulation
Frame
Microglow Micro-Hotplate:
• Stable light output
• Low power consumption
• >15 years lifetime
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Unique inhouse components
Tunable band-pass filter
(Fabry-Perot):
• Measurement at CO2
absorption and reference
wavelength
• Internal reference
measurment in every
cycle
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Unique inhouse components
Tunable band-pass filter
(Fabry-Perot):
• Measurement at CO2
absorption and reference
wavelength
• Internal reference
measurment in every
cycle
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What does it all mean? Excellent long term stability!
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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

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What does it all mean? Excellent long term stability!
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Specified drift: ±60 ppm/year even
at demanding conditions
GMP252 CO2 sensor

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”I know how often my CO2
sensors should be
checked”
”I can optimize employee
wellbeing AND energy
consumption”

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Selecting the right CO2 sensor for you
GMW80:
 Standard HVAC
 Value for money
 Easy manitenance
 5 year service cycle
 Accuracy*: ±60 ppm
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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

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Different ways to
maintain your
measurement

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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?
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Different ways to maintain CO2 sensors
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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

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Different ways to maintain CO2 sensors
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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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Different ways to maintain CO2 sensors
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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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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
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Unnecessary
adjustments
just add noise
to your
measurement

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Different ways to maintain CO2 sensors
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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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Different ways to maintain CO2 sensors
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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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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
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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
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Thank you
..and keep the CO2 at the right level!