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RKI Instruments SC-90 Single Toxic Gas, Sulfur Dioxide (SO2) 0-15 PPM - 73-2025RK

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RKI Instruments
RKI Instruments SC-90 Single Toxic Gas, Sulfur Dioxide (SO2) 0-15 PPM - 73-2025RK


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RKI Instruments SC-90 Single Toxic Gas, Sulfur Dioxide (SO2) 0-15 PPM - 73-2025RK

RKI Instruments SC-90 Single Toxic Gas, Sulfur Dioxide (SO2) 0-15 PPM - 73-2025RK



73-2025RK SC-90 Single Toxic Gas, Sulfur Dioxide (SO2) 0-15 PPM by RKI Instruments

The model SC-90 is designed to measure one of several toxic gases in the PPM (parts per million) range. This monitor is useful as a personal safety monitor for detecting dangerous levels of toxic gas in semiconductor manufacturing and other industries.

When gas concentration exceeds the preset alarm level, audible and visual alarms are activated. Display functions are controlled by micro-processor technology and operational functions can be performed without tools simply by pressing the control panel.

The gas concentration reading is continuously up-dated. The Averaged Reading function displays the average gas concentration during the monitoring period and the Peak Reading displays the highest gas concentration during the monitoring period. This model is powered by user replaceable standard Alkaline batteries. (Nickel Cadmium batteries with external charger or continuous operation from the AC power line are available as options.)

The dot-matrix display and cautional information make operation easily understood without special training. An electrochemical sensor delivers quick, accurate and repeatable readouts.


  • Microprocessor control
  • LCD digital readout
  • Diagnostic function
  • Sample-drawing system
  • Lightweight hands free monitoring
  • Peak hold and averaged readout
  • Audible/visual alarms
  • Fully portable
  • Touch panel controls
  • Easy to use

*Please note we can only ship RKI products to customers within the United States

SC-90 Specifications:
Detection principle Electrochemical sensor
Concentration readout Continuous measurement, Averaged readout and Peak Hold readout
Functional control Microprocessor
Display Dot-matrix self-illuminated LCD
Control functions Power switch, Voltage check, Peak hold switch, Averaged readout switch
Accuracy Better than ±10% of full scale
Response time Within 30 seconds(when exposed to gas at 3 times the alarm preset concentration)
Alarms Intermittent audible tone and flashing red LED lamp activates when gas level exceeds alarm preset point
Continuous audible tone and display of "REPLACE BATTERY" for low battery condition.
Continuous audible and visual alarm and display of "OVER PPM" for over scale.
Sampling system Sample-drawing by internal diaphgram pump
Ambient temperature and humidity -10°C ~ +40°C (14 to 104°F), Below 90% RH
Continuous operating hours
(with no alarms or lights)
Alkaline batteries (Standard) - Approx. 20 hours
Ni-Cd batteries (Optional) - Approx. 10 hours
AC Power Adaptor (Optional) - Continuous
Dimensions & weight 7.87" wide x 3.2" high x 5.6" deep, 4 lbs 3 ounces

Detectable Gas & Measuring Range
Detectable gas Chemical formula Measuring range Alarm preset point
Phosphine PH3 0 - 1.00ppm (0.05ppm/digit) 0.3ppm
Arsine AsH3 0 - 1.00ppm (0.05ppm/digit) 0.3ppm
Silane SiH4 0 - 15.0ppm (0.5ppm/digit) 5ppm
Diborane B2H6 0 - 30.0ppm (0.5ppm/digit) 10ppm
Hydrogen chloride HCl 0 - 5.00ppm (0.05ppm/digit) 2ppm
Sulfur dioxide SO2 0 - 15.0ppm (0.5ppm/digit) 2ppm
Nitric oxide NO 0 - 100ppm (1ppm/digit) 25ppm
Nitrogen dioxide NO2 0 - 15.0ppm (0.5ppm/digit) 3ppm
Hydrogen fluoride HF 0 - 9.0ppm (0.5ppm/digit) 3ppm
Hydrogen sulfide H2S 0 - 30.0ppm(0.5ppm/digit) 10ppm
Ozone O3 0 - 5.00ppm(0.05ppm/digit) 2ppm
Fluorine F2 0 - 3.00ppm (0.05ppm/digit) 1ppm
Bromine Br2 0 - 1.00ppm (0.05ppm/digit) 0.3ppm
Carbon monoxide CO 0 - 300ppm (5ppm/digit) 50ppm
Ammonia NH3 0 - 75ppm (1ppm/digit) 25ppm
Hydrogen sulfide H2S 0 - 1.00ppm (0.05ppm/digit) 0.3ppm
Chlorine Cl2 0 - 3.00ppm (0.05ppm/digit) 1ppm

Datasheets & User Manuals

Questions & Answers