MTL 5500 Intrinsically Safe Isolators  MTL5051

MTL5051 SERIAL-DATA COMMS ISOLATOR
The MTL5051 provides bi-directional serial data communication from a computer system in safe area to instrumentation in a hazardous area. It is used to provide a fully floating dc supply for, and serial data communications to: MTL643, MTL644, MTL646 and MTL647 IS text displays, other IS instrumentation, keyboards or a mouse. It can also be used for data communications across a hazardous area.

                                        
MTL5051 product specification  
SPECIFICATION
See also common specification
Location of field equipment
Zone 0, IIC, T4-6 hazardous area
Div 1, Group A hazardous location
Safe-area signal
RS232 or RS422
Hazardous-area signal
MTL640 Series mode:
To hazardous area: 3V signal superimposed on 12V
(nominal) supply
From hazardous area: 5mA signal superimposed on
quiescent current
Across hazardous area communications mode:
To hazardous area: 10mA current source
From hazardous area: 10mA current source
IS RS232/TTL devices mode:
To hazardous area: RS232-compatible signal levels
From hazardous area: TTL/RS232 signals
LED Indicators
Green: power indication
Max. power dissipation within unit
1.7W at 24V, 25mA load
Maximum power consumption (25mA load)
At Vs=20V, 105mA
At Vs=24V, 90mA
At Vs=35V, 70mA
Comms bandwidth
643/4 mode 1200 to 9600 baud
Other modes up to 19.2 kbaud
Safety description
Terminals 1,2,3,4 only 14V, 800mW, 192mA
Terminals 1,3,4 only 14V, 350mW, 88mA
Terminals 1,2,3 only 14V, 450mW, 108mA
Terminals 1,5,6 only 15V, 70mW, 35mA
Terminals 1,2,5,6 only 20V, 460mW, 139mA
Terminals 1,2,3,4,5,6 only 20V, 810mW, 227mA
Hazardous area supply terminal 2
+12V mode 12.0V ± 5% (load <23mA)
+12V mode 8.0V min (load >23 to <50mA)
+5V 5.6V ± 5% (load >23 to <50mA)
Hazardous Interfacing
See MTL640 Series for details of interfacing with MTL643,
MTL644, MTL646 and MTL647 IS text displays.
Across hazardous areas communications mode
The MTL5051 is used in pairs to transfer bi-directional fullduplex
data across hazardous areas, as shown above. Current
switching is used to minimise the bandwidth-limiting effects of
long cables.
Interfacing to an IS keyboard, mouse or other device
Communicating with RS232-level interfaces, such as an IS
keyboard, mouse, etc. is achieved by using one or more
MTL5051 units as required by the device. (TTL level interfaces are
also accommodated by the TTL-compatibility feature of RS232
receivers.) The supply to the IS equipment may be selected to be
either 5V or 12V by switch on top of unit.
 
Other reated product models for MTL5051 as below for your reference.





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