BASIC INFO
MTL7728+ Shunt-diode Safety Barrier MTL7728+ Zener Barrier Analogue Outputs
Detailed Product Description of MTL7728+ Shunt-diode Safety Barrier MTL7728+ Zener Barrier Analogue Outputs
Analogue outputs
Controller outputs (I/P converters)
The single-channel MTL7728+ with a voltage drop of 6.66V at 20mA is the recommended choice for most controller outputs. Higher-power versions are available: the MTL7728P+ (5.1V drop) is suitable for IIC applications; the MTL7729P+ (3.68V drop) for IIB applications.
For controllers with an output circuit separated from the 0V rail by the control transistor, the 2-channel MTL7787+ is the preferred choice as the return channel can handle up to 26.6V allowing the control signal to be turned off completely. The voltage drop is 8.1V at 20mA. A higherpower version of the latter, the MTL7787P+, is also available. The return channel of these barriers handle up to 26.4V and the maximum voltage drop is only 6.38V.
The MTL7787+ and MTL7787P+ are also suitable for controllers containing a resistor which enables the return current to be monitored for high-integrity operation.
Each Zone contains two stages of pulse-tested Zener or forward- connected diodes and an ‘infallible’ terminating resistor. In the event of an electrical fault in the safe area, the
Features of MTL7728+ Shunt-diode Safety Barrier MTL7728+ Zener Barrier Analogue Outputs
• Simple installation onto standard DIN railing
• Removable colour-coded terminals for easy connection, accommodate conductors up to 2.5 mm2
• Supports up to two zones of I.S. products
• Input circuitry protected against reverse polarity
• Can be used with the IFD-E(IS) industrial IR3 flame detector
MTL7728+ Shunt-diode Safety Barrier MTL7728+ Zener Barrier Analogue Outputs
Model MTL7728+ is an intrinsically safe, zone-powered, Zener-diode barrier for use in conventional fire detection systems for protection within hazardous areas.
Each Zone contains two stages of pulse-tested Zener or forward- connected diodes and an ‘infallible’ terminating resistor. In the event of an electrical fault in the safe area, the
diodes limit the voltage that can reach the hazardous area and the resistor limits the current. A fuse protects the diodes, and the two stages of voltage limitation ensure
continued safety if either stage should fail. No active output-current limiting circuits are employed.
Model MTL7728+ is certified ‘ia’ for all zones and ‘IIC’ for all explosive atmospheres.
Specification of MTL7728+ Shunt-diode Safety Barrier MTL7728+ Zener Barrier Analogue Outputs
Specification of MTL7728+ Shunt-diode Safety Barrier MTL7728+ Zener Barrier Analogue Outputs
Analogue Input - 2-wire transmitters, 4-20mA conventional and 'smart' |
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| Power Supply | Barrier |
Loops
|
Voltage for Tx
and lines |
Main features |
| Regulated | MTL7787+ |
1 |
12.4V
|
Compatible with most smart Tx's |
| MTL7787P+ | 1 | 13.1V | Higher power, IIC gases | |
| MTL7788R+ | 1 | 13.7V | 1-5V safe area ouput | |
|
Unregulated 20 to 35V |
MTL7706+ |
1
|
15.5V
(250ohm load) |
High accuracy; compatible with most smart transmitters; full output voltage available independently of supply voltage |
| MTL7707P+ | 1 | 13.0V | Higher power, IIB gases | |
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Analogue Input - vibration probes |
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| Power Supply | Barrier |
Loops
|
Main features |
| Regulated | MTL7796– | 1 | For –24V systems |
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Analogue Input - gas detectors |
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| Power Supply | Barrier |
Loops
|
Main features |
| Nominal 6V supplies | MTL7758+ | 1 |
For high current/low voltage MTL7758+ Vwkg = 6.0V |
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Analogue Input - thermocouple & mV sources |
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| Power Supply | Barrier |
Loops
|
Max end to enc resistance per loop |
Main features |
|
Earth-free signal, receiver input floating |
MTL7760ac | 1 | 150 ohm | – |
| Moving coil or low resistance receivers | MTL7755ac | 1 | 38 ohm | – |
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Analogue Input - ac sensors, photocells, microphones & flowmeters |
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| Power Supply | Barrier |
Loops
|
Max end to enc resistance per loop |
Main features |
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Earth-free signals up to a few kHz |
MTL7760ac | 1 | 150 ohm | – |
|
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Analogue Input - slidewire displacement transducers |
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| Power Supply | Barrier |
Loops
|
Vwkg | Main features |
|
For nominal 6V supplies |
MTL7760ac | 1 | 6.0V | – |
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Analogue Input - 2, 3 and 4-wire RTDs |
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| Power Supply | Barrier |
Loops
|
Main features |
| 2-wire | MTL7755ac |
1 |
2 channels track to 0.15 ohm |
| 3-wire | MTL7755ac | 2/3 | End-to-end resistance 19 ohm/channel |
| MTL7756ac | 1 | End-to-end resistance 19 ohm/channel | |
| 4-wire | MTL7755ac |
1/2
|
Needs 2 barriers |
| MTL7760ac | 1/2 | Vwkg = 6V; needs 2 barriers | |
| MTL7761ac | 1/2 | Vwkg = 6V; needs 2 barriers | |
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Analogue Input - strain-gauge bridges (single) |
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| Power Supply | Barrier |
Loops
|
Volts for 350 ohm bridge |
| IIC gases |
MTL7761ac (2) + MTL7764ac (1) |
1 | 9.75V from MTL7766Pac with 20V supply |
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Analogue Input - strain-gauge bridges (multiple) |
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| Power Supply | Barrier |
Loops
|
Volts for 350 ohm bridge (20V in) Number of bridges 1.............2..........3............4 |
| IIC gases |
MTL7761ac (2) + MTL7766ac (1) |
1 | 13.0........9.2.......7.7.........6,2 |
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Analogue Output - controller outputs (I/P converters) |
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| Power Supply | Barrier |
Loops
|
Volt drop at 20mA |
Main features |
| Output goes to 0V (earth return); regulated supplies | MTL7728+ |
1 |
6.8V | – |
| MTL7728P+ | 1 | 5.1V | Higher power, IIC gases | |
| MTL7729P+ | 1 | 3.7V | Higher power, IIB gases | |
| Transistor between controller output and 0V; (diode return); regulated supplies | MTL7787+ | 1 | 8.1V | – |
| MTL7787P+ | 1 | 6.4V | Higher power, IIC gases | |
| Transistor between controller output and 0V; (diode return); unregulated supplies (20 to 35V) | MTL7707+ |
1
|
8.6V | – |
| MTL7707P | 1 | 6.0V | Higher power, IIC gases | |
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Digital Input - switches |
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| Power Supply | Barrier |
Loops
|
Main features |
| Regulated | MTL7787+ | 1 | Diode return |
| MTL7787P+ | 1 | ||
| MTL7789+ | 2 | ||
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Digital Input - switches / proximity detectors |
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| Power Supply | Barrier |
Loops
|
Main features |
| Unregulated 22-35V | MTL7741 | 1 | Changeover relay output |
| MTL7742 | 1 | Transistor output, fast switching | |
| MTL7743 | 2 | 2 x relay contacts | |
| MTL7744 | 2 | 2 x transistor output | |
| MTL7745 | 1 | Single channel relay + LFD | |
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Digital Output - alarms, LEDs, solenoid valves, etc |
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| Power Supply | Barrier |
Loops
|
Usable power per loop | Main features |
| Switch in power leg, (earth return); regulated supplies | MTL7728+ |
1 |
0.48W | – |
| MTL7728P+ | 1 | 0.59W |
Higher power, IIC gases Voltage drop = 5.1V at 20mA |
|
| MTL7729P+ | 1 | 0.82W | Higher power, IIB gases | |
| Control switch on earth (diode return); regulated supplies | MTL7787+ | 1 | 0.42W | – |
| MTL7787P+ | 1 | 0.51W | Higher power, IIC gases | |
| Transistor between controller output and 0V; (diode return); unregulated supplies (20 to 35V) | MTL7707+ |
1
|
0.29W | Up to 35mA available |
| MTL7707P+ | 1 | 0.68W | Optimised for IIB gases | |
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Digital Input/Output - –ve and floating supplies |
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| Power Supply | Barrier |
Loops
|
Volts for 350 ohm bridge |
|
Regulated negative/floating power supply |
MTL7728– | 1 | – |
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2-wire DC/AC systems - signal returns |
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| System or Function | Barrier |
Loops
|
Vwkg | Main features |
| 6V dc systems | MTL7710+ |
1 |
6.0V | – |
| 8V dc system | MTL7710P+ | 1 | 8.0V |
End ot end resistance 42 ohm. 5V at 65mA from 8V supply. IIC gases |
| Low-level logic returns | MTL7764+ | 2 | 10.0V | End-to-end resistance 1050 ohms |
| 12V dc systems | MTL7715+ | 1 | 12.0V | – |
| MTL7715P+ | 1 | 12.6V | – | |
| 18V dc systems | MTL7722+ | 1 | 19.6V | – |
| 2-wire dc/ac systems | MTL7778ac | 1 | 24.0V | – |
| Signal returns | MTL7789+ |
2
|
26.6V | 2 diode return channels + power |
| Securing cables to earth for future use; terminating cable screens | MTL7799 | – | – | Bussed power feed - not certified |
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