Contenu connexe
Similaire à Webinar on maintaining hvac co2 measurements the easy way (20)
Plus de Vaisala Group (20)
Webinar on maintaining hvac co2 measurements the easy way
- 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
- 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
- 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
- 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
- 21. © 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
- 22. © 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
- 25. © 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
- 26. © 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
- 27. © 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
- 28. © 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