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AirTest PT9250 & CO

2

 Application Guide

1 of 

12

Application Guide:

Harness The Power Of Portable 

CO

2

 Measurement

With The PT9250 Hand Held Monitor

Measure Ventilation – Estimate Energy Savings – Building Troubleshooting

Overview

This  application guide  is  much  more  than  a  product  manual.   It  is  also  targeted at  making  you
knowledgeable  as  to  how  the  measurement  of  carbon  dioxide  (CO

2

)  can  help  you  understand

buildings  better  in  order  to  save  energy  and  solve  problems.   Its  one  thing  to  measure  CO

2

,

however this book provides a study guide that will quickly give you the critical knowledge and a
competitive  advantage  in  using  CO

2

  as  a  powerful,  and  profitable  measurement  parameter  of

ventilation and building performance.

Table Of Contents

1.  Introduction  ................................................................................................................... 2

2.  Quick Start Basics  ........................................................................................................ 2

3.  Spot Check Ventilation Rates  ...................................................................................... 3

4.  Using The UIP Software Interface With The PT9250 ................................................. 5

5.  Data Logging With The PT9250  .................................................................................. 7

6.  Calibration ..................................................................................................................... 7

7.  Making Most Of The TR9250 – Some Application Examples  .................................... 8

Summary of Contents for PT9250

Page 1: ...help you understand buildings better in order to save energy and solve problems Its one thing to measure CO2 however this book provides a study guide that will quickly give you the critical knowledge and a competitive advantage in using CO2 as a powerful and profitable measurement parameter of ventilation and building performance Table Of Contents 1 Introduction 2 2 Quick Start Basics 2 3 Spot Che...

Page 2: ...Start Basics Turning On The Hand Held Sensor Plug the charger provided with the sensor into the bottom of the TR9250 and allow it to charge for at least 1 5 hours To power up the TR9250 you will have to hold the power button down for approximately 10 seconds while the sensor performs a self diagnostic check Once you press the power button you will see 88 88 displayed on the upper display and 88 88...

Page 3: ... space By using the pC program provided with the sensor you can change both the location and the way this information is displayed on the screen 3 Spot Check Ventilation Rates Background The PT9250 not only measures CO2 and Temperature but it also calculates the outside air ventilation rate in cfm per person based on the difference between inside and outside CO2 levels So how can we determine the ...

Page 4: ... or windows as well as the area directly surrounding a discharge grill Blowing Into The Sensor Pure exhaled breath contains 40 000 ppm of CO2 that will readily disperse in air Try to avoid breathing directly on the sensor when taking a measurement If you do breath into the sensor it will not hurt the sensor but it may take a few minutes for the sensor to readjust to normal background levels Since ...

Page 5: ...verter attachment that will allow the cable provided to interface with a USB port When you start the program it will immediately search for the sensor plugged into your computer and start to download information in the sensor This may take a few minutes If you are having problems with connecting to the sensor visit the troubleshooting section of this document General Tab Once the program has loade...

Page 6: ...connected from the PT9250 Graphed Results Each time the sensor is turned on a new logger file is created and can be identified at the top of the graphical display By clicking on the file you can view the set of data for that file The oldest files will have the lowest number Once the data logger has reached its maximum capacity it will begin logging over the oldest data The graph function is very b...

Page 7: ...e database memory 895 points and write over previously recorded data a sampling interval should be selected that allows for adequate space in the data logger Some guidelines on maximum sampling periods are provided below 1 Day 2 minute sampling 2 Day 4 minute sampling 5 Day 10 minute sampling 7 Day 15 minute sampling Battery Life Logging The battery life of the PT9250 is 10 to 16 hours As a rule y...

Page 8: ...f the PT9250 is on the zero adjustment of the sensor The sensor generally should not require span adjustment If performing both types of calibration the zero calibration should be performed first 7 Making Most Of The TR9250 Some Application Examples Overview This section provides a brief description of a number of real world applications for the PT9250 hand held Estimating Ventilation Rate From A ...

Page 9: ...essed in the decimal equivalent of parts per million Vop 0 0106 0 000675 0 000400 3 8 5 cfm person If the number of people in the space is known when the measurement is taken the total outside air ventilation rate to the space can be calculated by multiplying the occupancy times the number of people in the space This value in most buildings will represent the fixed ventilation rate provided to the...

Page 10: ...ow quickly levels change when you open a window or a door Dealing With IAQ Complaints Many symptoms related to indoor air quality IAQ complaints can also be associated with other physical ailments stress or emotional issues related to the individual If you are involved in investigating a suspect IAQ problem you can use the PT9250 to determine if ventilation is a factor in the complaint or concern ...

Page 11: ... a ceiling return plenum may reflect excessive supply air duct leakage into the plenum Calculation of percentage of outside air in an air handler can be performed using a process identical to the differential temperature method except substituting CO2 levels measured Determine if ventilation systems are delivering adequate fresh air to a particular zone based on its current occupancy Improperly ad...

Page 12: ...al CO2 retrofit you may also want to include use of Variable Speed Drives to modulate air delivery Ideally the system should be integrated with the existing building control system Most major control manufacturers have CO2 control routines available thatwill run with their systems Further Application Reference AirTest has numerous articles and application notes available on CO2 control systems and...

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