Home Products MTL Safety Barriers&Isolators

MTL700, 4700 or 7000 Series Zener Barriers

Product Details:

Place of Origin:	England
Brand Name:	MTL

Payment & Shipping Terms:

Minimum Order Quantity:	5 pcs
Price:	according to the purchase quantity
Packaging Details:	carton
Delivery Time:	in stock
Payment Terms:	T/T payment
Supply Ability:	100pcs

Contact Now

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
Unregulated 20 to 35V	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
3-wire	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	–
Control switch on earth (diode return); regulated supplies	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	–
12V dc systems	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