M21 warning sign series
Visual and audible alarms for many areas of application
With the warning signs of the M21 series, GfG offers you bright alarm devices with integrated buzzer for commercial and industrial applications. Choose from various standard texts or individual lettering according to your specifications. The warning signs can be connected with three wires to relay modules, controllers and transmitters with relay output or integrated into a digital Modbus infrastructure. With the GfG app and a Bluetooth-enabled device, you can easily test the alarm functions and configure basic settings.
Analog or digital communication
Connect your warning signs to the relays of your gas detection devices via three wires or choose the 4-wire versions for a Modbus infrastructure with less cabling effort. The Modbus versions also have a Bluetooth module for function tests and settings via app.
Low power consumption and long service life
The warning signs operate with a 24 V DC supply voltage and the power consumption is 1.32 watts maximum. The LED light sources have a service life of 50,000 hours.
Simple mounting
The included mounting brackets can be offset by 90 degrees, depending on whether the warning sign is mounted on the wall or ceiling.
Targeted alerting
You can choose from standard or special texts for the LED lettering. The loud integrated horn (max. 100 db(A)) provides an acoustic alarm at the same time. LEDs and horn can be switched separately for multi-level alarms.
Key features at a glance
- 3-wire or 4-wire cabling (Modbus)
- Bluetooth for service functions (only for Modbus versions)
- Long-life LEDs with low power consumption
- Simple wall or ceiling mounting
- 1 or 2-sided labeling with standard or special text
- Integrated horn (can be switched separately)
- Protection class: IP40
Modellvarianten der M21-Serie
Model | Dimensions (W x H x D) | Connection | Labeling |
M2159-3L | 290 x 130 x 30 mm | 3-wire | one-sided |
M2159-Bus | 290 x 130 x 30 mm | 4-wire | one-sided |
M2161-3L | 410 x 130 x 30 mm | 3-wire | one-sided |
M2161-Bus | 410 x 130 x 30 mm | 4-wire | one-sided |
M2162-3L | 410 x 130 x 30 mm | 3-wire | two-sided |
M2162-Bus | 410 x 130 x 30 mm | 4-wire | two-sided |