Single strain-gauge bridges of MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
This shows an arrangement using two or three barriers, which is safe in IIC gases. With the MTL7761ac, the circuit is powered from a 14V, 230Ω source; if the bridge resistance is 230Ω, then the bridge voltage is 7V. If the bridge resistance is 350Ω, then the bridge voltage is 8.4V.
An MTL7764ac can be used to sense the bridge supply voltage.
An MTL7761ac is used here for the mV output.
An MTL7766Pac provides 12.3V for a 350Ω bridge with a 20V supply.
MTL7761Pac's can be used for the sense and pick-off circuits.
Features of MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
►Removable terminals
►Bussed power feed to other modules
►Relay and solid state switch modules
►Dual channel variants — 6.3mm per channel
►Proximity detector inputs
►Electronic fusing
►Direct replacement for MTL700 Series barriers
►Compatible terminal numbering and safety descriptions
MTL7700 Series Barriers of MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
Part Number
MTL7706+, MTL7707+, MTL7707p+, MTL7710+, MTL7715+, MTL7715p+, MTL7722+, MTL7728+/–/ac, MTL7728p+, MTL7729p+, MTL7741, MTL7742, MTL7743, MTL7744, MTL7745, MTL7761ac, MTL7761pac, MTL7764+, MTL7764ac, MTL7765ac, MTL7766ac, MTL7766pac, MTL7767+, MTL7778ac, MTL7779+
MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
| MTL7700 range Intrinsically Safe Zener Barriers | |
| Product | Description |
| MTL7706+ | Shunt-Diode Safety Barrier |
| MTL7707+ | Shunt-Diode Safety Barrier |
| MTL7707P+ | Shunt-Diode Safety Barrier |
| MTL7710+ | Shunt-Diode Safety Barrier |
| MTL7715+ | Shunt-Diode Safety Barrier |
| MTL7715P+ | Shunt-Diode Safety Barrier |
| MTL7722+ | Shunt-Diode Safety Barrier |
| MTL7728+ | Shunt-Diode Safety Barrier |
| MTL7728- | Shunt-Diode Safety Barrier |
| MTL7728ac | Shunt-Diode Safety Barrier |
| MTL7728P+ | Shunt-Diode Safety Barrier |
| MTL7729P+ | Shunt-Diode Safety Barrier |
| MTL7741 | Shunt-Diode Safety Barrier |
| MTL7742 | Shunt-Diode Safety Barrier |
| MTL7743 | Shunt-Diode Safety Barrier |
| MTL7744 | Shunt-Diode Safety Barrier |
| MTL7745 | Shunt-Diode Safety Barrier |
| MTL7755ac | Shunt-Diode Safety Barrier |
| MTL7756ac | Shunt-Diode Safety Barrier |
| MTL7758+ | Shunt-Diode Safety Barrier |
| MTL7758- | Shunt-Diode Safety Barrier |
| MTL7760ac | Shunt-Diode Safety Barrier |
| MTL7761ac | Shunt-Diode Safety Barrier |
| MTL7761Pac | Shunt-Diode Safety Barrier |
| MTL7764+ | Shunt-Diode Safety Barrier |
| MTL7764ac | Shunt-Diode Safety Barrier |
| MTL7765ac | Shunt-Diode Safety Barrier |
| MTL7766ac | Shunt-Diode Safety Barrier |
| MTL7766Pac | Shunt-Diode Safety Barrier |
| MTL7767+ | Shunt-Diode Safety Barrier |
| MTL7778ac | Shunt-Diode Safety Barrier |
| MTL7779+ | Shunt-Diode Safety Barrier |
| MTL7787+ | Shunt-Diode Safety Barrier |
| MTL7787P+ | Shunt-Diode Safety Barrier |
| MTL7788+ | Shunt-Diode Safety Barrier |
| MTL7788R+ | Shunt-Diode Safety Barrier |
| MTL7789+ | Shunt-Diode Safety Barrier |
| MTL7796+ | Shunt-Diode Safety Barrier |
| MTL7796– | Shunt-Diode Safety Barrier |
| MTL7798 | Power Feed Module |
| MTL7799 | Dummy Barrier |
MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
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 |
|
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 |
MTL4500 Series Barriers MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
MTL4501-SR, MTL4504, MTL4510, MTL4510B, MTL4511, MTL4513, MTL4514 (B)(D), MTL4516, MTL4516C, MTL4517, MTL4521, MTL4521L, MTL4523, MTL4523L, MTL4523R, MTL4523V, MTL4523VL, MTL4524, MTL4524S, MTL4525, MTL4526, MTL4531, MTL4532, MTL4533, MTL4541, MTL4541A, MTL4541AS, MTL4541B, MTL4541P, MTL4541S, MTL4541T, MTL4544, MTL4544A, MTL4544AS, MTL4544B, MTL4544D, MTL4544S, MTL4546, MTL4546C, MTL4546S, MTL4546Y, MTL4549, MTL4549C, MTL4549Y, MTL4561, MTL4575, MTL4576-RTD, MTL4576-THC, MTL4581
MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
MTL7761ac MTL7761pac MTL7764+ MTL7764ac MTL7765ac MTL7766ac Shunt-Diode Safety Barriers
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