Up to 32 Devices, Wired or Wireless Up to 16 BM 25
Configurable up to eight zones
Alarm and Fault Condition LEDs
The MX 40 is a gas detection unit that
communicates via radio to the BM 25 wireless
units. This makes it possible to centralize all of
the measurements recorded by the BM 25s in one
location and to adjust settings.
The MX 40 controller can manage up to 16 wireless
BM 25 units, including up to 32 measurement
channels. A unit equipped with LEL, NH3 and
O2 cells will occupy 3 measurement channels.
Therefore, a maximum of
10 units of this type could be connected to the same
The technology used is a mesh network. With this type
of network, all of the hosts are interconnected, forming a
net-like structure. Each network node can receive, send,
and relay data. This avoids the problem of sensitive
points in the network, which, in the case of an outage,
would cut the connection to a part of the network. If a
node is out of service, the neighboring nodes will relay
the messages via another route.
The maximum range between network nodes is 1000
meters, open-field. Because the same message can be
relayed 4 times, the maximum distance between a node
and an MX 40 unit can reach up to 5000 meters.
The frequency is 2.4 GHz. This frequency is the most popular because it is license-free in most places in the
world, unlike the 868 MHz and 900 MHz bandwidths. To be precise, communication is carried out on the ISM
(Industrial, Scientific and Medical) radio band which is located between 2.4 and 2.4835 GHz.
The radio communication is secure and conforms to IEEE standard 802.15.4, issued in June 2005. This
standard uses DSSS (Direct-Sequence Spread Spectrum) signaling, which outlines strict rules for transmission
and coding. In this signaling process, each bit to be transmitted is transformed into a set of n bits. The main
advantage is the assurance of redundancy in the transmission of information, so that transmission errors are
controlled and corrected. DSSS has been used by the military since the 1940s.
Up to a maximum of 32 measurement points, the MX 40 can combine with BM25 wireless units, 4-20
mA analog detectors, RS485 700-series digital detectors, and other wireless systems from our sister company
The I/O modules communicate over the MX 40's RS485 network. They are mounted on the DIN rail on the MX 40
enclosure or they may be located remotely, up to 1000 meters from the controller.