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S 120

S 120 Oil vapor sensor

The new oil vapor sensor S 120 monitors oil contents of compressed air and gases permanently or for spot checks when used as portable unit in conjunction with S 551. The simple installation and the outstanding performance makes S 120 the ideal choice when oil vapor contents needs to be measured and monitored.

Oil free compressed air is not an easy task to be achieved. Monitoring is a must in many industries and applications to avoid contaminations in products and risks for health of humans. S 120 makes this monitoring task affordable and reliable.
For best accuracy and long term stability, the sensor applies an automatic calibration. Sensor contaminations and sensor life time are monitored and will be indicated to the user. An over range detection will remove the sampling air from the sensor to protect it against contamination.
  1. Instruction Manual

  2. Datasheet



            -Measures oil vapor contents in compressed air and other gases.

            -Can be used for permanent or in portable applications.
            -Measures down to 0.001 mg/m³.
            -Easy connection through sampling hose and quick connect.
           - Output signals: - 4 … 20 mA
                                        - RS-485, Modbus/RTU
                                        - Relay switch (NO).
            -PID sensor for highest accuracy.
            -Service and Alarm indication through LED.
           - Connectable to SUTO displays and data loggers as well as third parties displays and control units.
           - Integrated 5” touch screen and data logger (option).


  • Technical Data

    Technical data S 120
    Measuring medium
    Compressed air and gases free of corrosive,
    aggressive, caustic and flammable constituents.
    Measuring range
    0.001 … 10.00 mg/m³ (based on
    1000 hPa (a), 20 ºC, 0% relative humidity).
    Sensor type PID (photoionization detector)
    Detection limit 0.001 mg/m³
    Accuracy 5% of reading +- 0.003 mg/m³
    Operating pressure 3 … 15 barg (higher pressure on request)
    Gas humidity < 40% rel. humidity, no condensation.
    Sample flow rate < 2 l/min, measuring gas is released to ambient.
    Gas connection 6 mm quick connect.
    Electrical connection
    Sensor life time
    Gas temperature
    Ambient conditions
    Transport temperature
    Output signal
    Power supply
    Display & data logger

    M12 connector.

    6000 operating hours. Will be indicated. Sensor exchange by service.
    -20 ºC ... +50 ºC (at inlet)
    -20 ºC ... +50 ºC
    -30 ºC ... +70 ºC
    4…20 mA (0 … 10 mg/m³
    RS-485, Modbus/RTU
    Relay: NO, 32 VDC / 500 mA.
    24 VDC ± 5%, 8 W
    5” touch screen, 100
    5” touch screen, 100 million values (option).
    Downstream of activated carbon filters
    Downstream of oil-free compressors
    Wherever upstream drying and filtration is applied.
    PC, Al alloy, 271 X 205 X 91 mm.
    According to IEC 61326-1
    Various sensor settings can be performed
    through SUTO-iTEC display units or through the
    related service software


    Sample rate

    2400 g  
    1 s


 Medical air

• Pharmaceuticals
• Breathable air
• Marine air
• Food and beverage
• Medical engineering
• High speed trains
• Semiconductor fabs
• Conveyance of hygroscopic food
• High tech processes
• Electronics industry



S 120 mounted at the wall for permanent

oil vapor monitoring

Portable S 120-P with accessories

connectable to S 551     


  Limits of oil vapor

Compressed air class 1 (EN ISO 8573-1): 0.01 mg/m³
Medical applications (EAB 407/1238): 0.1 mg/m³
Breathing apparatus (EN 12021): 0.5 mg/m³
If you have any querry, please contact us for further details!
Ms. Tham Tran (Alice)
Cell phone: (+84) 907 16 83 73


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