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MTL7728+ Shunt-diode Safety Barrier MTL7728+ Zener Barrier A

description:MTL7728+ Shunt-diode Safety Barrier MTL7728+ Zener Barrier Analogue Outputs ...
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.


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 

Analogue Input - 2-wire transmitters, 4-20mA conventional and 'smart'

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
 

Analogue Input - vibration probes

Power Supply Barrier
Loops
Main features
Regulated MTL7796– 1 For –24V systems
 

Analogue Input - gas detectors

Power Supply Barrier
Loops
Main features
Nominal 6V supplies MTL7758+ 1 For high current/low voltage
MTL7758+ Vwkg = 6.0V
 

Analogue Input - thermocouple & mV sources

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
 

Analogue Input - ac sensors, photocells, microphones & flowmeters

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
 

Analogue Input - slidewire displacement transducers

Power Supply Barrier
Loops
Vwkg Main features
For nominal
6V supplies
MTL7760ac 1 6.0V
 

Analogue Input - 2, 3 and 4-wire RTDs

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
 

Analogue Input - strain-gauge bridges (single)

Power Supply Barrier
Loops
Volts for 350 ohm bridge
IIC gases MTL7761ac (2) +
MTL7764ac (1)
1 9.75V from MTL7766Pac with 20V supply
 

Analogue Input - strain-gauge bridges (multiple)

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
 

Analogue Output - controller outputs (I/P converters)

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
 

Digital Input - switches

Power Supply Barrier
Loops
Main features
Regulated MTL7787+ 1 Diode return
MTL7787P+ 1  
MTL7789+ 2  
 

Digital Input - switches / proximity detectors

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
 

Digital Output - alarms, LEDs, solenoid valves, etc

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
 

Digital Input/Output - –ve and floating supplies

Power Supply Barrier
Loops
Volts for 350 ohm bridge
Regulated negative/floating
power supply
MTL7728– 1
 

2-wire DC/AC systems - signal returns

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


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 ,Honeywell,Siemens,ABB,FLUKE,Endress+Hauser,Schneider Electric,Moeller,FUJI,Omron,Pepperl+Fuchs,Hima,Yaskawa, Norgren, Hach, Weidmuller ,Phoenix,MTL,Testo etc.
 
Why choose us?
 
1. 100% original product, 100% quality assurance.
If you find a fake. Please contact us without hesitation! We afford the shipment cost! We send you a new product asking zero cent!
 
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We can shipping all over the world.via DHL,UPS,Fedex,TNT and EMS etc., the packaging is very safe and strong. if you have any special needs,please notify me.
It will take 3 to 7days to reach in your hands.
 
Packaging: 
Imported with original packaging or standard export packing.Customize design is acceptable.
 
Contact:
 
HONGKONG XIEYUAN TECH CO., LIMITED
Email:becky@hkxytech.com   Web:www.hkxytech.com
Mobile:+86-15972186287(Whatsapp & Wechat) 
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