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GMI BM 25 & BM 25 Wireless Transportable Multi-Gas Area Monitors

  Up to 5 gases simultaneously
  103 dB at 3 feet audible alarm
  Ultra-bright flashing signal at 360deg
  Run time of 170 hours
  Resistant to harsh environment
  Easily transportable - less than 15 lbs
  30 devices per network
  16 independent networks
  More than 0.5 mile RF line of site

The GMI BM 25 Transportable Multi-Gas Area Monitor combines the advantages of a fixed gas detection area monitor with the transportable qualities of a portable instrument. The GMI BM 25 can detect between one and five gases, and is used for applications such as team protection, area surveillance, mobile or temporarily work applications and also locations where a permanent, fixed system is not suitable.

Up to 170 hours of continuous running time are possible with the GMI BM 25, as it is powered by a NiMH battery pack.

The GMI BM 25 monitor also has datalogging capacity of more than four months, as well as STEL and TWA values.

The protection of larger areas can be achieved using multiple units, which can be grouped using optional alarm transfer kits. Alarms are transferred from one BM 25 to the next. For long-term area monitoring in classified zones, an intrinsically safe trickle charger is also available.

Available as an option, the radio communication allows several BM 25 devices to communicate on the same network or to send information wirelessly to a controller.

The network topology used by the BM 25 is a MESH network. In a mesh network all hosts are connected peerto- peer without central hierarchy, thereby forming a net-like structure. Consequently, each node can receive, send and relay data. This prevents having sensitive points, which in case of failure, cut the connection of the network. If a node is down, its goes through another route.

Wireless communication is made via a 2.4 GHz radio and emitted power is less than 100 mW. Maximum distance between two communicating devices is 0.6 mile line of sight.


Mesh topology allows fast and simple deployment, high coverage versatility and high fault tolerance. It significantly reduces installation and operating costs of networks. These solutions reproduce the architecture of the Internet while optimizing for wireless.

The GMI BM 25 Transportable Multi-Gas Area Monitor is suitable for a wide range of industries including refineries and pharmaceutical production. Applications suitable for the GMI BM 25 include turnaround work sites, rig overhauls and fence-line surveillance.

“Plug-and-Play” Sensors Available: O2, CO, H2S, %LEL, SO2, NO, NO2, HCN, HCl, Cl2, ETO, PH3, AsH3, SiH4, CO2, H2, NH3, PID, XP IR, etc.


Data Sheet

Ordering Information


BM 25 accessories

BM25KITCHS25 Single BM 25 Intrinsically Safe Trickle charger with one IS power supply and one 25 meter cord*
BM25KITCHS50 Single BM 25 Intrinsically Safe Trickle charger with one IS power supply and one 50 meter cord*
BM25KITCHS100 Single BM 25 Intrinsically Safe Trickle charger with one IS power supply and one 100 meter cord*
BM25KITCHD25 Dual BM 25 Intrinsically Safe Trickle charger with two IS power supply and one 25 meter cord*
BM25KITCHD50 Dual BM 25 Intrinsically Safe Trickle charger with two IS power supply and one 50 meter cord*
BM25KITCHD100 Dual BM 25 Intrinsically Safe Trickle charger with two IS power supply and one 100 meter cord*
6315862 BM 25 Alarm Transfer Kit (Cable length = 25 m)
6315863 BM 25 Alarm Transfer Kit (Cable length = 50 m)
6315864 BM 25 Alarm Transfer Kit (Cable length = 100 m)
6321388 BM 25 Tripod
6321390 BM 25 Charger support
6511157 BM 25 Universal Charger w/Power Cord
6511164 BM 25 vehicule Charger w/Power Cord
6311082 BM 25 Battery pack
WLOGUSB BM 25 Datalink Adapter Kit (Software w/USB Adapter Cable)
6331159 BM 25 Calibration cup (BM 25 without pump)
6331165 BM 25 Calibration cup (BM 25 pumped)
6336042 BM 25 Hydrophobic filter (includes for all sensors type)
6314601 BM 25 connectors for Logic input
6314201 Pump kit for BM 25 ATEX only (need the BM 25 S/N)
BM25W-UPGRADE UPGRADE KIT from standard BM 25 to WIRELESS Version (in factory only), Parts and labor included
BM25AW-UPGRADE UPGRADE KIT from standard BM 25A to WIRELESS Version (in factory only), Parts and labor included

* The Dual BM 25 Intrinsically Safe Trickle charger which includes an additional IS power module, is required to provide the adequate trickle charge rate and to continuously maintain BM 25 power if using any two of the LEL, IR, PID sensors, OR in the aspirated (pump) version OR in the wireless mode if any one of the LEL, IR, PID sensor.

LEL catalytic bead sensor

6313888 BM 25 Sensor, LEL/Methane (BM 25 ATEX only)**
6313969 BM 25 Sensor, LEL/Methane (BM 25A CSA only)***

LEL Infrared sensor

6314064 BM 25 IR Sensor, 0-100% LEL CH4 (5% vol)**
6314065 BM 25 IR Sensor, 0-100% LEL CH4 (4.4% vol)**
6314087 BM 25 IR Sensor, 0-100% LEL (Propane)**
6314088 BM 25 IR Sensor, 0-100% LEL (Butane)**
6314090 BM 25 IR Sensor, 0-100% LEL LPG**
6314091 BM 25 IR Sensor, 0-100% LEL (Ethanol)**
6314092 BM 25 IR Sensor, 0-100% vol. CH4**

CO2 Infrared sensor

6313818 BM 25 Sensor, Carbon Dioxide (CO2, 0-5% vol.), medium

Electrochemical sensor

6313811 BM 25 Sensor, AsH3 (Arsine 0-1ppm), mini
6313809 BM 25 Sensor, Cl2 (Chlorine 0-10ppm), mini
6313843 BM 25 Sensor, Cl2 (Chlorine 0-10ppm), medium
6313841 BM 25 Sensor, ClO2 (Chlorine Dioxide 0-3ppm), mini
6313787 BM 25 Sensor, CO (Carbon Monoxide 0-1000ppm), mini
6313826 BM 25 Sensor, CO (Carbon Monoxide 0-2000ppm) (High), mini
6313868 BM 25 Sensor, CO null H2(Carbon Monoxide 0-500ppm), mini
6313823 BM 25 Sensor, CO/H2S (Carbon Monoxide/Hydrogen Sulfide), medium
6313812 BM 25 Sensor, COCl2 (Phosgen 0-1ppm), mini
6313821 BM 25 Sensor, ETO (Ethylene Oxide 0-30ppm), medium
6313820 BM 25 Sensor, F2 (Fluor 0-1ppm), mini
6313803 BM 25 Sensor, H2 (Hydrogen 0-2000ppm), mini
6313788 BM 25 Sensor, H2S (Hydrogen Sulfide 0-100ppm), mini
6314206 BM 25 Sensor, H2S null CO (Hydrogen Sulfide 0-100ppm), mini
6313804 BM 25 Sensor, HCl (Hydrogen Chloride 0-30ppm), mini
6313805 BM 25 Sensor, HCN (Hydrogen Cyanide 0-30ppm), mini
6313806 BM 25 Sensor, HF (Hydrogen Fluoride 0-10ppm), mini
6313879 BM 25 Sensor, N2H4 (Hydrazine 0-1ppm), mini
6313799 BM 25 Sensor, NH3 (Ammonia 0-100ppm), mini
6313800 BM 25 Sensor, NH3 (Ammonia 0-1000ppm), mini
6313802 BM 25 Sensor, NO (Nitric Oxide 0-300ppm), mini
6313856 BM 25 Sensor, NO (Nitric Oxide 0-300ppm), medium
6313801 BM 25 Sensor, NO2 (Nitrogen Dioxide 0-30ppm), mini
6313857 BM 25 Sensor, NO2 (Nitrogen Dioxide 0-30ppm), medium
6313780 BM 25 Sensor, O2 (Oxygen 0-30% Vol.), medium
6313817 BM 25 Sensor, O2 (Oxygen 0-30% Vol.) mini
6313807 BM 25 Sensor, O3 (Ozone 0-1ppm), mini
6313810 BM 25 Sensor, PH3 (Phosphine 0-1ppm), mini
6313998 BM 25 Sensor, PID (0-1500ppm), medium
6313808 BM 25 Sensor, SiH4 (Silane 0-50ppm), mini
6313819 BM 25 Sensor, SO2 (Sulfur Dioxide 0-30ppm), medium
6313822 BM 25 Sensor, SO2 (Sulfur Dioxide 0-100ppm), medium

"** For BM 25 ATEX only ( 6514842 or 6514889)
*** For BM 25A CSA only ( 6514872 or 6514891)"



Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.

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