MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
►Features of MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
Simple installation onto standard DIN railing
Removable colour-coded terminals for easy connection, accommodate conductors up to 2.5mm2,
Supports up to two zones of I.S. products
►Description of MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
Model MTL7787+ 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 MTL7787+ is certified 'ia' for all zones and 'IIC' for all explosive atmospheres.
| ►Specification of MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock | |
| Ordering Code | MTL7787+ |
| Safety Description: | |
|
Maximum voltage of Zener diode when fuse blows |
28V |
| Minimum value of terminating resistor | 300Ω |
| Maximum short-circuit current | 93mA |
| Number of Channels | 2 |
| Maximum end-to-end resistance | 333Ω |
| Working Voltage | 26.6V |
| Maximum Voltage | 27.2V |
| Fuse Rating (continuous) | 50mA |
| Operating Temperature Range | -20°C to + 60°C (continuous working) |
| Storage Temperature Range | -40°C to + 80°C |
| Maximum Humidity | 95%RH - Non Condensing (at 40°C) |
| Weight (g) / Dimensions (mm) | 140 / H90 x W105 x D12.6 |
| Mounting Method | DX070 Box |
MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
Analogue Input - 2-wire transmitters, 4-20mA conventional and 'smart' |
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| Power Supply | Barrier |
Loops
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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
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Main features |
| Regulated | MTL7796– | 1 | For –24V systems |
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Analogue Input - gas detectors |
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| Power Supply | Barrier |
Loops
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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 |
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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
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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
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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
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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
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Volts for 350 ohm bridge |
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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
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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 MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
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
MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
MTL5523VL MTL5524 MTL5525 MTL5526 MTL5531 MTL5532 MTL5533 MTL5541 MTL5541AS MTL5541S MTL5544 MTL5544A MTL5544AS MTL5544D MTL5544S MTL5546 MTL5546Y MTL5549 MTL5549Y MTL5561 MTL5573 MTL5575 MTL5576-RTD MTL5576-THC MTL5581 MTL5582 MTL5599 MTL5314
MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
MTL7787+ Zener Barrier MTL7787+ Zener-diode Barriers In Stock
We are specialized in intelligent instruments, including : control system, transmitters, flow meters,sensors, recorders, analyzers, control valves, controllers, PLC's, etc.
We mainly supply Yokogawa, Emerson, Rosemount, Fisher, Honeywell, Siemens, ABB, FLUKE, Endress+Hauser, Schneider Electric, Pepperl+Fuchs, MTL, Rockwell(Allen Bradley), Hirschmann, Eaton, Moeller, FUJI, Omron, Yaskawa, Norgren, CHINT, Hach, Weidmuller, Phoenix, SMC, Testo, ASCO, Parker, Mitsubishi, Festo, GE, CISCO, Auma, IFM, GM, Turck, Bently Nevada, MOXA, Krohne, Foxboro and so on.
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HONGKONG XIEYUAN TECH CO., LIMITED
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