MTL5061 FIRE/SMOKE Detector Interface

MTL5061 FIRE/SMOKE DETECTOR INTERFACE
two-channel, loop-powered

The MTL5061 is a loop-powered two-channel interface for use with
conventional fire and smoke detectors located in hazardous areas. In
operation, the triggering of a detector causes a corresponding change
in the safe-area circuit. The unit has reverse input polarity protection,
while ‘non-fail’ earth fault detection on either line can be provided by
connecting an earth leakage detector to terminals 3 or 6.
SPECIFICATION
See also common specification
Number of channels
Two
Location of detectors
Zone 0, IIC, T4–6 hazardous area if suitably certified
Div. 1, Group A hazardous location
Current range 1 to 40mA, nominal
Integral input polarity protection Input circuit protected against reverse polarity
‘No-fail‘ earth fault protection (optional)
Enabled by connecting terminals 3 and 6 to the MTL4220 earth
leakage detector. If a fault on either line of each channel is
proclaimed: unit continues working.
Note:1. The earth leakage detector introduces a 100μA, 1Hz ripple to the field circuit.
Minimum output voltage Vout at 20ºC whichever is the lower of:
Vin – (0.38 x current in mA) – 2V or 21V – (0.35 x current in mA)
Response time to step input Settles to within 500μA of final value within 30ms
Hazardous-area output Maximum output voltage 28V from 300Ω
Transfer accuracy at 20°C Better than 400μA
Temperature drift <10μA/°C (–20 to 60°C