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The MTL4700 Series of safety barriers are multi-channel devices designed for close integration of intrinsic safety into process systems. Combining the compact ‘plug-in’ design concept of the MTL4000 Series of isolators with the circuit d
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The MTL4700 Series of safety barriers are multi-channel devices designed for close integration of intrinsic safety into process systems. Combining the compact ‘plug-in’ design concept of the MTL4000 Series of isolators with the circuit designs of the well-known MTL700 Series of barriers, the new barriers provide exceptionally high packing densities allied to proven reliability – so reducing space requirements and weight loading without sacrificing performance.


Multi-channel modules save space
Backplane mounting simplifies cabling
Standard & custom backplanes
High integrity earth connections
Removable hazardous area connector
Products in this range do not conform to ATEX Directive 94/9/EC and have been discontinued.
 
 
Product Code Description Downloads
 Symbol denotes that the equipment is suitable for use in hazardous area applications.
 Symbol denotes that the product has been assessed for functional safety applications
MTL4700  MTL4700 Series Common Specification
MTL4706+  2ch - 2-wire 4/20mA & smart Tx
MTL4715+  4ch - 12V DC applications
MTL4722+  4ch - 18V DC applications
MTL4728–  4ch - negative & floating supplies
MTL4728+  4ch - digital or 4/20mA outputs
MTL4755ac  3ch - 3-wire RTD applications
MTL4760ac  2x2ch - two thermocouples/AC sensors/4-wire RTD
MTL4763Pac  3x2ch - strain-gauge bridges
MTL4778ac  2x2ch - 2-wire DC & AC systems
MTL4781+  4ch+1 - 4 switches + 1 supply
MTL4787+  2x2ch - multi-purpose inputs/outputs
MTL4787P+  2x2ch - hi-power multi-purpose inputs/outputs
MTL4788+  2x2ch - 4/20mA Tx
MTL4788R+  2x2ch - 4/20mA Tx + voltage output
MTL4796–  2x2ch - vibration probes
MTL4799  Dummy barrier
 
 
Ambient temperature
–20 to +60°C (continuous working)
–40 to +80°C (storage)
Humidity
5 to 95% RH
Leakage current
For ‘basic’ barriers with a working voltage of 5V or more, the
leakage current decreases by at least one decade/volt reduction
in applied voltage below the working voltage over two decades.
For the MTL4755ac it decreases by at least one decade for a 0.4V
reduction in applied voltage.
Safe-area terminations
Through 11-way base connector onto backplane.
Pins 7, 12 and 17 are earth connections for all modules and are
tracked on all backplanes to the heavy-duty earth terminal.
Pins 15 and 16 on bussed-power modules pick up power from
bussed-power backplanes.
Pins 15 and 16 on modules which cannot pick up bussed power
are not linked internally.
Hazardous-area terminations
By separate 6-way connector into the barrier top
Colour coding (barrier top label)
Grey: non-polarised
Red: positive polarity
Black: negative polarity
White: dummy barrier
Weight
175g approximately (each module)

 

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