KANOMAX 2211 Handheld IAQ Monitor - Manual (Page 20)

15
5. %OA Mode
％ OA MODE is to provide calculation of ventilation ratio with temperature or CO
2
.
Calculation is based on below formula:
%OA＝(R_A - S_A)／(R_A – O_A)×100
* %OA： Ventilation Ratio
R_A： Temperature and CO
2
in respiratory air
S_A： Temperature and CO
2
in supplied air
O_A： Temperature and CO
2
in open air
Measurements take place in order of :
Respiratory Air – Supplied Air- Open Air
The average value in each point is used for the calculation of ventiltation ratio..
Temperature or CO
2
concentration velue of each point （TRIAL(1)～TRIAL(N)） will be stored in the memory.
TRIAL(1) (2) (3) (N) TRIAL(1) (2) (3) (N) TRIAL(1) (2) (3) (N)
Time needed to measure at a point・・・Sampling Time × Ｎ（Number of Trial）
Respiratory (R_A) Supplied (S_A) Open Air (O_A)
Respiratory Air: R_A=ΣTRIAL(N)/N
Supplied Air: S_A=ΣTRIAL(N)/N
Open Air: O_A=ΣTRIAL(N)/N
** Ventilation Ratio （%ＯＡ）
%OA = (R_A - S_A) / (R_A - O_A) x 100
Open Air (O_A)
Respiration (R_A)
Supplied (S_A)