رله بریرمدل MTL5561

The MTL5561 is a loop-powered 2–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 current. The unit features reverse input polarity protection, while ‘no-fail’ earth fault detection on either line can be provided by connecting an earth leakage detector to terminal 3 and/or 6

SPECIFICATION

Number of channels: Two, fully floating, loop powered

Location of fire and smoke detectors: Zone 0, IIC, T4–6 hazardous area if suitably certified Div. 1, Group A, hazardous area Input voltage: 6 to 30V dc

Current range : 1 to 40mA, nominal

Quiescent safe–area current at 20°C: (hazardous–area terminals open circuit)< 400μA at Vin= 24V per channel Integral input polarity protection: Input circuit protected against reverse polarity : Enabled by connecting terminals 3 and/or 6 to an earth leakage detector Fault on either line of each channel proclaimed: unit continues working

Notes: 1. To maintain isolation between the two channels, separate earth leakage detectors are needed. 2. The earth leakage detectors introduce a 100μA, 1Hz ripple to the field circuit

Minimum output voltage Vout at 20°C: For Vin ≤ 25V: Vout = Vin – (0.38 x current in mA) – 2V For Vin > 25V: Vout = 22.5V – (0.35 x current in mA)

Maximum output voltage: 28V from 300Ω