Compact & Lightweight 4-Gas Monitors
The MUNI MP420 is a compact and lightweight 4-gas detector for worker safety at hazardous locations, with four standard sensors for Oxygen (lead-free, O2), Combustibles (LEL), Carbon Monoxide (CO) and Hydrogen Sulfide (H2S). Alternative sensors are low power Infra-red Methane (CH4), Sulfur Dioxide (SO2), and Hydrogen Cyanide (HCN).

List of Benefits

  • Compact, robust, lightweight & wearable
  • Auto backlit LCD with large numeric digits
  • Easy-to-navigate menu with two buttons
  • Up to 4 replaceable sensors out of 7 choices; interchangeability reduces monitor cost
  • Battery operation 24 hours with pellistor LEL sensor; extended time with low-power infra-red LEL sensor
  • Tri-color status indicators on regular self-diagnosis of sensor, battery and circuit
  • Wide angle LED alarms
  • 1000 Events log
  • Combination charge adapter / micro-USB PC interface cable
  • IP-68 ingress rating
  • Optional BLE wireless connectivity
  • Optional MuniDock or CaliCase for convenient bump and calibration


The detector is packaged in a robust housing with no moving parts. It's battery power offers 2 work shifts of run time for a standard 4-gas detector, and extended run time using a low-power infra-red sensor. The simple, 2- button operation results in ultimate ease of use and significantly reduced time spent training the user. A unique capability for this product segment is the ability for the MP420 to utilise different toxic sensors in its configuration compared to traditional 4-gas or compliance detectors. The instrument has the ability to detect Sulfur Dioxide (SO2), and Hydrogen Cyanide (HCN) as well as a low powered I-R for reliable combustible detection that helps your unit run longer.

  • MP420 detector including rechargeable Li+ battery, selected sensors and alligator clip
  • AC Charging adapter
  • Calibration cap
  • USB Communication cable
  • Quick start guide
  • Calibration certificate
  • External filters
  • BLE Wireless
  • MuniDock MP420T bump & calibration station
SpecificationDetail Description
Size110 x 60 x 30 mm
Weight230 g
BatteryRechargeable Li-ion pack
Temperature-20°C to 50°C
Humidity5 to 95% relative humidity (non-condensing)
Calibration & Bump TestManual with calibration cup. MuniDock single-bay (MP420T) or CaliCase 4-bay (MP342) options allow automated bump test and calibration and printing certificates
AlarmAudible (95 dB @ 30 cm), Visual (tri-color LEDs), Vibration
Datalogging1000 Events (alarms, function tests and calibrations)
Charging and Communication 2-point calibration, zero and span, power on zero (user-selectable)
Docking Stations for Cal & BumpCharging with AC adapter or cable to PC, PC comm for data download, monitor setup and firmware upgrades via cable, optional BLE (Bluetooth Low Energy), or MuniDock
IP ratingIP-67
Safety CertificationsIECEx Ex da ia IIC T4 Ga, Class I, Div 1, Group ABCD, CULUS T4, -20°C ≤ Tamb ≤ +50°C, ATEX II 1G Ex da ia IIC T4 Ga, European Conformity EMC/RFI
Warranty2 Years including sensors 3 Years with CH4(NDIR)/O2(Lead-free)/H2S/CO

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