MTL7789+| Instruments | Proximity Detector Interface
For switching inputs with input currents <10mA per channel, the MTL Zener Safety Barrier MTL7789+ provides a two-channel passive Zener barrier.
All MTL7700 series Zener barriers are designed according to the same design principles. Each channel consists of 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
MTL7755ac
MTL7760ac
Analog input (high level) Transmitter, 2-wire, 4/20mA
MTL7706+
MTL7787+
MTL7787P+
MTL7788+
Analog Output
Controller output, single wire to ground
Controller output, neither wire grounded
MTL7728+
MTL7787+
MTL7787P+
Digital (switch) input Switch/proximity switch
MTL7787+
MTL7787P+
MTL7789+
MTL7741
MTL7742
MTL7743
MTL7744
MTL7745
Digital (Switching) Outputs
Solenoids, Alarms, Light Emitting Diodes
MTL7728+
MTL7707+
MTL7728P+
MTL7729P+
MTL7787+
MTL7787P+
Positive DC Systems
Low Voltage to 12V DC Systems
18V DC Systems
MTL7764+
MTL7767+
MTL7722+
AC and DC Systems High Voltage AC and DC Systems
MTL7765ac
MTL7778ac
Negative/Floating Power Supply Digital (Switching) Outputs MTL7728-
Spare Cord and Shield - MTL7799
Bus Power Usage - MTL7799
MTL7706
MTL7707+
MTL7707P+
MTL7741
MTL7742
MTL7743
MTL7744
MTL7745
MTL7787+
MTL7787P+
MTL7788+
MTL7789+
| Manufacturer |
MTL Instruments |
| Product type |
Vibration Transducer Interface |
| Product no |
MTL7789+ |
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