UNI 321 Maintenance Free Single Gas Detector

The UNI 321 is a disposable or maintenance free version of the UNI single gas detector. It detects hydrogen sulfide, carbon monoxide or oxygen in a selection of models with operating lives of 12 months, 24 months or 36 months. The detectors have large LCDs providing maximum readability in the field and six bright LEDs allow for quick alarm notification. Constructed of strong and durable material, the UNI 321 is designed to be comfortable and drop resistant. The UNI detectors can easily be bump tested and calibrated using the CaliCase System.


  • Simple Go or No-Go!
  • No maintenance needed for the life of the instrument (except when used under extreme conditions)
  • Low cost of ownership
  • Large display
  • Durable housing
  • Sold, stainless steel alligator clip
  • 50% larger single cell battery
  • Daily functional self test
  • 50 event datalogging
  • Docking station for calibration and event download
  • UL Classification, Class 123, Groups ABCDEFG


Alarm Type High alarm, low alarm, over range alarm, battery low alarm
Alarm Signal 90 dB @ 30 cm
Bright red LED
Built in vibrator
Calibration Manual zero, CaliCase allows 2 point calibration, zero and span
Event Log Up to 50 alarm events
Response Time, t90 20 seconds
IP Rating IP67
EMI/RFI Compliant with EMC 2004/108/EC
Operating Life 1 year, 2 years or 3 years depending on model purchased
Temperature -4°F to 122°F
Humdity 5 to 95% rH, non-condensing
Size 3.45″ x 2.44″ x 1.3″
Wireless Frequency ISM license free bands
Wireless Range 300 feet
Temperature -4 to 131°F
Humidity 0 to 95% relative humidity (non-condensing)
Intrinsic Safety Class I, Div 1, Group A, B, C, D, Class II, Div 1, Group E, F, G, Class III, Div 1

Sensor Specifications

Carbon Monoxide (CO)
0 – 500 ppm
1 ppm
Hydrogen Sulfide (H2S)  0 – 100 ppm 0.1 ppm
Oxygen (O2)  0.1-30%  0.1%

Ordering Information

The UNI carbon monoxide gas detector, hydrogen sulfide gas detector or oxygen gas detector includes an alligator clip, AA size Li-Ion battery, quick reference guide and cal adapter. For pricing, please call AFC International at 1-800-952-3293, 219-987-6825 or fax 219-987-6826 or email sales@afcintl.com

Catalog No.
UNI Hydrogen Sulfide Detector, 1 year
UNI Hydrogen Sulfide Detector, 2 years
UNI Hydrogen Sulfide Detector, 3 years
UNI Carbon Monoxide Detector, 1 year
UNI Carbon Monoxide Detector, 2 years
UNI Carbon Monoxide Detector, 3 years
UNI Oxygen Detector, 1 year
UNI Oxygen Detector, 2 years
UNI Oxygen Detector, 3 years

UNI Maintenance Free Detector literature

Tags: CO Carbon Monoxide Gas Detector, H2S Hydrogen Sulfide Gas Detector, O2 Oxygen Gas Detector

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