MTL7728+| Instruments | Proximity Detector Interface
All MTL7700 series Zener barriers are based on the same design
principles. Each channel contains a secondary pulse detecting Zener
or forward connecting diode and a “reliable” terminating resistor.
In the event of an electrical fault in the safety zone, the diode
limits the voltage that can reach the hazardous area, while the
resistor has a current limiting effect. A fuse protects the diode,
and a two-stage voltage limiting function ensures continuous
protection in the event of a failure in either stage. No active
output current limiting circuitry is used. All models are certified
“ia” - for all zones and “IIC” - for all explosive atmospheres
(except MTL7707P+ and MTL7729P+, “ia” “IIB”).
Commonly Used MTL7700 Summary Table
Type Application Main safety barriers
Analog input (low level) RTD temperature detector, thermocouple, AC
sensor
MTL7756ac
MTL7760ac
Analog input (high level) Transmitter, 2-wire, 4/20mA
MTL7706+
MTL7787+
Analog Output
Controller output, single wire grounded
Controller output, neither wire grounded
MTL7728+
MTL7787+
Digital (switch) input Switch
MTL7787+
MTL7787+ MTL7741/3
Digital (switching) outputs Solenoid valves, alarms, light-emitting
diodes MTL7728
| Manufacturer | MTL Instruments |
| Product type | Vibration Transducer Interface |
| Product no | MTL7728+ |
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