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Home ProductsMTL Safety Barriers&Isolators

MTL700, 4700 or 7000 Series Zener Barriers

MTL700, 4700 or 7000 Series Zener Barriers

MTL700, 4700 or 7000 Series Zener Barriers

Product Details:

Place of Origin: England
Brand Name: MTL

Payment & Shipping Terms:

Minimum Order Quantity: 1pc
Price: according to the purchase quantity
Packaging Details: carton
Delivery Time: in stock
Payment Terms: T/T payment
Supply Ability: 100pcs
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Detailed Product Description

Choosing a barrier,MTL Instruments

The MTL7700 Series, with their advanced features, should be regarded as your first choice for all new designs or installations. The recommendations below are based therefore on the MTL7700 Series.

Users of MTL700, 4700 or 7000 Series products can also use the guide because of MTL's consistent numbering policy. Products, in any barrier series, that have the same two last digits (ignoring letters and '+' symbols) will have very similar characteristics, e.g. MTL7787 and MTL787.

Click for alternatives to earlier barrier models

Analogue Inputs (high level)
  • 2-wire transmitters, 4-20mA conventional and 'smart'
  • vibration probes
  • gas detectors
Analogue Inputs (low level)
  • thermocouples and mV sources
  • ac sensors, photocells, microphones & flowmeters
  • slidewire displacement transducers
  • 2, 3 and 4-wire RTDs
  • strain-gauge bridges - single
  • strain-gauge bridges - double
Analogue Outputs
  • controller outputs (I/P converters)
Digital (ON/OFF) Inputs
  • switches
  • proximity detectors/switches
Digital (ON/OFF) Outputs
  • alarms, LEDs, solenoid valves, etc.
Digital (ON/OFF) Input/Output
  • -ve/floating supply
AC/DC systems
  • 2-wire dc/ac systems and signal returns

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

 

 

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