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pH Sensing Glass
ASI...MEASURING YOUR SUCCESS!
ASI pH GLASS GUIDE
Glass Type Glass Image Specification
Type II
Low Impedance Glass
Hemi Shape
 pH Range: 0 to 13 pH
Impedance Range: 45 to 360 MW
Temperature Range: -10 to 135°C
Response Time: 1 second
LIS Response Time: < 30 seconds
Stability: ± 1mV (in 24 hours)
Type III
Hard Glass
Industrial/Dome Shape

Spear Shape		 pH Range: 0 to 12 pH
Impedance Range: 200 to 600 MW
Temperature Range: -10 to 135°C
Response Time: 10 seconds
LIS Response Time: < 60 seconds
Stability: ± 1mV (in 24 hours)
Type IV
Low Na Error Glass
Hemi Shape		 pH Range: 0 to 13 pH
Impedance Range: 45 to 360 MW
Temperature Range: -10 to 135°C
Response Time: 1 second
LIS Response Time: < 30 seconds
Stability: ± 1mV (in 24 hours)
Type V
Flat Glass
Flat / Convex Shape		 pH Range: 0 to 13 pH
Impedance Range: 80 to 315 MW
Temperature Range: -10 to 105°
Response Time: 5 seconds
LIS Response Time: < 30 seconds
Stability: ± 1mV (in 24 hours)
Type VIII
Standard Glass
Hemi Shape

Industrial/Dome Shape		 pH Range: 0 to 14 pH
Impedance Range: 120 to 675 MW
Temperature Range: -10 to 135°C
Response Time: 3 seconds
LIS Response Time: < 30 seconds
Stability: ± 1mV (in 24 hours)
NOTES:

 

  • Impedance of a glass is given as a range of values @ 25°C. This is due to the different bulb shapes and the different glass stem sizes used in our products. Please ask your ASI account manager to determine the impedance of your glass.
  • Temperatue range is based on the abilities of the glass stem, not the overall combination electrode.
  • Response time is the time to 95% of scale
  • LIS: Low Ionic Strength Solution (< 100µS)
  • Response time is calculated on the pH stem level, not is a completed combination electrode. Response time in a combination electrode varies from design to design due to the various electrolytes used in ASI sensors.
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