ETO-A1 Ethylene Oxide Sensor

PERFORMANCE

Sensitivity          nA/ppm in 20ppm EtO                            2000 to 3200
Response time   t90 (s) from zero to 20ppm EtO                         < 150
Zero current      ppm equivalent in zero air                                   ± 0.6
Resolution        RMS noise (ppm equivalent)                                < 0.1
Range               ppm EtO limit of performance warranty                 100
Linearity           ppm error at full scale, linear at zero, 40ppm EtO 5 to 10
Overgas limit    maximum ppm for stable response to gas pulse    200

LIFETIME

Zero drift          ppm equivalent change/year in lab air                      nd
Sensitivity drift % change/month in lab air, twice monthly test         nd
Operating life   months until 80% original signal (12 month warranted) > 24

ENVIRONMENTAL

Sensitivity at -20°C  % (output @ -20°C/output at 20°C) @ 40ppm EtO     35 to 65
Sensitivity at 50°C   % (output @ 50°C/output at 20°C) @ 40ppm EtO   110 to 140
Zero at -20°C          ppm equivalent change from 20°C           < ± 0.5
Zero at 50°C           ppm equivalent change from 20°C           < 2 to 4

CROSS SENSITVITY

H2S     sensitivity   % measured gas at 20ppm H2S        < 200

NO2    sensitivity    % measured gas at 10ppm NO2       < 50
Cl2      sensitivity    % measured gas at 10ppm Cl2         < -1
NO      sensitivity    % measured gas at 50ppm NO         < 80
SO2    sensitivity    % measured gas at 20ppm SO2       < 50
CO      sensitivity    % measured gas at 400ppm CO       < 30
H2      sensitivity    % measured gas at 400ppm H2       < 0.5
C2H4  sensitivity    % measured gas at 80ppm C2H4     < 100
NH3    sensitivity    % measured gas at 25ppm NH3       < 0.1
HCHO sensitivity    % measured gas at 4ppm HCHO       90
CO2    sensitivity    % measured gas at 5% CO2            < 0.1

KEY SPECIFICATIONS
Temperature range  °C                                           -30 to 50
Pressure range         kPa                                         80 to 120
Humidity range       % rh continuous                      15 to 90
Storage period        months at 3 to 20°C (stored in original container)     6
Load resistor          Ω (recommended)                     10 to 47
Bias voltage            mV (working electrode potential above reference electrode potential) 300
Weight                   g                                              < 6