INM 5500 Rev 11
30
6 .2 Digital Output modules
The single channel Digital Output (DO) module range enables on/off devices in a hazardous area
to be controlled from the safe area. Some units are loop powered while others enable solid-state
switching by providing independent power supplies.
6 .2 .1
MTL5521(-T) - Solenoid Alarm driver
Single channel, loop powered, IIC
The MTL5521(-T) is a loop-powered module that enables a device located in the hazardous area
(IIC gas group) to be controlled from the safe area. The MTL5521(-T) can drive a certified
intrinsically safe low-power load, as well as non-energy-storing simple apparatus such as an
LED.
6
5
4
3
2
1
7
8
9
10
11
12
13
14
Solenoid, alarm
or other IS device
20 – 35Vdc
–
+
+
–
To earth leakage
detector *
Hazardous area
Safe area
Terminal
Function
1
Output –ve
2
ve
11
Supply –ve
12
ve
Figure 6 .10:
Top label
for MTL5521(-T)
