UNI 321 – Maintenance Free Single Gas Detectors


The UNI 321 is a disposable or maintenance-free version of UNI single gas detector. It detects hydrogen sulfide (H2S), carbon monoxide (CO) or oxygen (O2) in a selection of models with operating lives of 12 months (MP101), 24 months (MP102) or 36 months (MP103). The detectors have large LCDs providing maximum readability in the field. Six bright red LEDs allow for quick alarm notification. Constructed of strong and durable material, the UNI 321 is designed to be comfortable, yet drop-resistant. The UNI detectors can easily be bump tested and calibrated using the CaliCase System.


Simple GO, NO-GO!
No Maintenance needed for life of instrument (except when used under extreme conditions)
Low cost of ownership
Large Display
Durable Housing
Solid 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


• Emergency response
• Environmental
• Fire service
• Industrial hygiene
• Oil and gas



General Specifications

Size3.46 x 2.44 x 1.3 in
Weight4.4 oz (125 g)
Temperature-4°F to 122°F (-20°C to 50°C)
Humidity5 to 95% relative humidity (non-condensing)
Alarm typeHigh alarm, Low alarm, Over range alarm, Battery low alarm
Alarm signal90 dB @ 30 cm Bright red LED Built in vibrator
CalibrationManual zero (CaliCase/MP300T1 allows 2-point calibration, zero and span)
Event logUp to 50 alarm events
Response time (t90)20 seconds
IP ratingIP-67
EMI/RFICompliant with EMC 2004/108/EC
Safety CertificationsClass I, Div 1, Group ABCD Class II, Div 1, Group EFG Class III, Div 1 T4, -20°C ≤ Tamb ≤ +50°C Ex ia IIC T4 II 1G Ex ia IIC T4 (pending) European Conformity UL Listed
Operating life1 year for MP101 2 years for MP102 3 years for MP103
Model Options
GasRangeModelPart Number
H2S (Hydrogen Sulfide)0.1 – 100 ppmMP101 MP102 MP103M014-0002-000 M015-0002-000 M015-0002-000
CO (Carbon Monoxide)1 – 500 ppmMP101 MP102 MP103M014-0001-000 M014-0001-000 M016-0001-000
O2 (Oxygen)0.1 – 30.0%MP101 MP102 MP103M014-0003-000 M015-0003-000 M016-0003-000

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