mPower Electronics Inc.

Making Powerful Senses

Compact Diffusion Multi-Gas Detectors

The MUNI MP420 is a compact and lightweight 4-gas detector for worker safety at hazardous locations, with four standard sensors for oxygen (O2), combustibles (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S). Alternative sensors are lead-free oxygen (O2), low-power infrared methane (CH4), sulfur dioxide (SO2), and hydrogen cyanide (HCN). The detector is packaged in a robust housing with no moving parts. Its battery power offers 24 hrs for a standard 4-gas detector, and extended runtime when using a low-power infrared sensor. The simple, 2-button operation results in ultimate ease of use and significantly reduced time spent training the user. To save user cost, sensors are not interchangeable and must be specified at time of purchase.

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Product Features
  • Compact, robust, lightweight & wearable
  • Auto backlit LCD with large numeric digits
  • Easy-to-navigate menu with two buttons
  • Battery operation 24 hours with pellistor LEL sensor extended time with low-power infrared 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 weather ingress rating
  • Optional BLE wireless connectivity
  • Optional MuniDock for convenient bump & calibration
  • Up to 4 factory-configured sensors selected from 8 sensor options
  • Sensors replaceable but not interchangeable (to save user cost).
Certifications
Downloads
Applications

Confined space entry and general safety compliance in:

Multi-gas leak detection in industries such as chemical, food and beverage, oil and gas (downstream)

*** Available to ship in second quarter of 2021

Detector Specifications
Size4.33 x 2.36 x 1.10 in (110 x 60 x 28 mm)
Weight8 oz (230 g)
Sensor
  • Standard LEL (Pellistor), O2, CO and H2S
  • Alternatives CH4 (NDIR), O2 LF (Pb-free), SO2 and HCN
  • Replaceable but not interchangeable
BatteryRechargeable Li-ion pack: ≥ 24 hours (with Pellistor) or extended run time (with NDIR)
Direct Readout
  • Real-time reading of gas concentration
  • Visual compliance indicator
  • Battery status
  • STEL, TWA, peak and minimum values
DisplaySegment LCD, 1.75 x 1.25 in (44 x 32 mm) with LED backlight for enhanced readability
Keypad2 operation keys
CalibrationManual calibration. MuniDock option allows automatic bump test and calibration
AlarmWireless remote alarm notification, audible (95dB@30cm), vibration, visual (flashing bright red LEDs), and on-screen indication of alarm conditions Man Down Alarm with pre-alarm and real-time remote wireless notification
Datalogging1000 Events (alarms, function tests and calibrations)
Charging and Communication
  • Charging with AC adapter or cable to PC
  • PC comm for data download, monitor setup & firmware upgrades via cable, optional BLE (Bluetooth Low Energy), or MuniDock
Temperature-4° to 122°F (-20°C to 50°C)
Humidity0% to 95% relative humidity (non-condensing)
IP RatingIP-68
Safety Certifications

UL/cUL: Class I, Div 1, Group A, B, C, D
T4, -20°C ≤ Tamb ≤ +50°C
EMC/RFI
EMC directive: 2004/108/EC
ATEX II 1G Ex da ia IIC T4 Ga

Warranty2-year including sensors

Sensor Options
SensorRangeResolutionResponse Time (t90)
1. Combustible (LEL)

  • Pellistor
  • NDIR
  • 0-100%LEL
  • 0-100% LEL CH4
1%LEL
  • 15 sec
  • 30 sec
2. Oxygen (O2)

  • Galvanic
  • Lead-free
  •  
0-30%Vol0.1%Vol
15 sec

3. Hydrogen Sulfide (H2S) or

Hydrogen Cyanide (HCN) 

0-100ppm

0-50ppm

0.1ppm

0.1ppm

15 sec
45 sec

4. Carbon Monoxide (CO) or

Sulfur Dioxide (SO2)

0-1000ppm

0-20ppm

1ppm

0.1ppm

15 sec
30 sec

* Sensors are replaceable but NOT interchangeable.  Sensor configuration must be decided at time of purchase because each configuration has a unique circuit board.

Docking Station for MP420 Series

The MUNI Docking Station provides easy instrument bump testing, calibration, configuration, firmware upgrade, data download, and calibration certificates.