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Sustainable Single Gas Detector (available for over 28 different gases!)
Brand: WatchGas Detection
Made in: Netherlands

The UNI Sustainable is a sustainable single gas detector that offers a simple portable solution for a wide array of toxic gases and O2 (Oxygen) applications. The monitors have a large LCD screen, providing maximum readability in the field. These monitors are equipped with six bright red LEDs, allowing quick alarm notification. Constructed of strong and durable material, the UNI Sustainable is designed to be comfortable, yet drop resistant. The UNI series can easily be bump tested and calibrated with the WatchGas UNI Mono/Multi Dock.


  • 28 sensor options - 31 models available;
  • Between 2 and 5 year operation time, depending on the sensor;
  • Large LCD, 30% larger than most gas detectors;
  • Size: 3.46 x 2.44 x 1.3 (88 x 62 x 33 mm);
  • Weight: 4.4 oz (125);
  • Event logger;
  • IP-68;
  • Password protection;
  • Six bright red flashing LEDs;
  • Low, High, TWA & STEL alarms.


The WatchGas UNI is a compact and easy-to-use single gas monitor. Available with a very wide range of sensors that are suitable for many types of gases, such as a sensor for oxygen. In addition, the WatchGas UNI Sustainable also offers a wide choice of sensors for toxic gases. With its bright LED display and loud 95dB acoustic alarm, no alarm will pass you by, ensuring your safety with regard to gases.

The UNI offers a simple portable solution for a wide array of toxic gases and O2 applications. With a large LCD screen, the UNI provides maximum readability in the field. Six bright red LEDs and a loud buzzer provide unmistakeable alarm notification. It even has a built-in vibration alarm, for extra peace of mind in noisy work environments and when working with hearing protection. The UNI is constructed using strong and durable materials, to provide protection in the harshest of environments. It also rests easy in your hand, with a grippy, rounded surface for optimal useability even when wearing multiple layers of protective clothing. The UNI series can easily be bump tested and calibrated with the WatchGas Mono/Multi Dock.

Detector Specifications

Size 88mm (W) x 62mm (H) x 33mm (D)
Weight 125g
Sensor Technology 34 electrochemical sensors options
Temperature -20°C ~ +50°C
Humidity 5% ~ 95% RH (non-condensing)
Alarm Type High Alarm, Low Alarm, TWA Alarm, STEL Alarm, Over Range Alarm, Battery Low Alarm, Bumptest and Calibration due notification
Alarm Signal Acoustic: 95 dB @ 30cm
Visual: Red flashing LEDs
Vibration: Vibration
Display LCD Display
Calibration 2-point calibration, zero and span. Power-on zero calibration with user confirmation
Event Log Up to 50 alarm events
Battery Replaceable 3.6AA Lithium battery for 3 years of operation
Measurement Diffusion
Housing Polycarbonate and rubber
Response Time T90 15 sec (CO/H2S/O2)

Other gases vary (TN4: Sensor Technical Data Summeries)

Accuracy Deviation 2-3%
IP-Rating IP68
EMI/RFI Compliant with EMC 2014/30/EU
Safety Certifications UL: Class 1, Div 1, Group A,B,C,D
Class II, Div 1, Group E,F,G
Class III, Div 1 T4, -20°C < Tamb ≤ +50°C
ATEX: II 1G Ex ia IIC T4 Ga
IECEX: Ex ia IIC T4 Ga
CE: Conformite Europeenne
Sensor Life CO/H2S: 5 years
Other Sensors: 1 to 2 years as per warranty
Warranty 2 years for UNI Sustainable with O2, H2S, CO, SO2, HCN, NO, NO2 or PH3 sensor
1 year for UNI sustainable with other sensors


Order Information

Manufacturer Watchgas
Lifetime: 1 or 2 Years
Available Sensors:
CO, H2S, O2, SO2, Cl2, NO, NO2, H2, PH3,
Ethylene Oxide (ETO), NH3, ClO2, O3, HF, HCl,
HCN, CH3SH, THT, Acetaldehyde (C2H4O),
AsH3, COCl2


Sensor Specifications

Product Application:

  • (Petro) chemical plants and factories
  • Tank storage parks
  • Wastewater treatment facilities
  • Mining industry
  • Construction sites
  • Food and beverage industry
  • Fumigation
  • Disinfection

Key Features

  • 34 models available for 28+ different gases (and increasing!)
  • Between 1 and 5 year sensor life, depending on sensor
  • Large LCD
  • Weight: 125 g, 4.4 oz
  • Event logger
  • IP rating: IP68
  • Password protection
  • Six bright red flashing LEDs, loud acoustic alarm, vibrating alarm
  • Low, High, TWA & STEL alarms.


Standard Equipment:

  • Calibration adapter
  • Manual


  • UNI Series Multi Docking Station
  • UNI Series Mono Docking Station
  • Calibration Gases
  • Fixed Flow Regulator (0.5L per minute Stainless Steel
  • or 1L per minute Stainless Steel regulators)
  • Last-O-More Hose

The contents are subject to change without prior notice.


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