The MTL7706+ is a 1-channel shunt-diode safety barrier, with builtin electronic overvolt protection, for energising a 2-wire, 4/20mA transmitter in a hazardous area. It is powered from a positive supply of 20–35V dc and delivers a 4/20mA signal into an earthed load in the safe area. It is proof against short circuits in the field and in the safe area and is extremely accurate. The MTL7706+ will pass incoming communication signals up to10kHz from a ‘smart’ transmitter, while in the outgoing direction it will pass signals of any frequency likely to be encountered.

Since the MTL7706+ has no return channel for energising the load, the entire output of the single ‘28V’ channel is available to power the transmitter, providing high output capability. This channel is negatively polarised, and the safe-area signal is in fact the very current that returns through it from the hazardous area, the novel circuit being energised by a built-in floating dc supply derived from the external dc source of power.

To prevent any leakage through the zener diodes and maximise the output voltage available at 20mA, the floating supply is given a rising voltage/current characteristic. A separate circuit limits the current to protect the fuse in the event of a short circuit in the hazardous area. With a 20V supply, the barrier will deliver 16.2V minimum at 20mA for the transmitter and lines and consumes typically 45mA at 24V operation.

MTL7706+ ADDITIONAL SPECIFICATION
 

Safety description:28V 300Ω 93mA
Supply voltage:20 to 35V dc w.r.t earth
Output current:4 to 20 mA
Voltage available to transmitter and lines
16.2V @ 20mA with 250Ω load (negative w.r.t. earth)
11.0V @ 20mA with 500Ω load (negative w.r.t. earth)
Accuracy:±2µA under all conditions
Safe-area load resistance:0 to 500Ω
Supply current
45mA typical at 20mA and 24V supply
60mA maximum at 20mA and 20V supply

 

Other related models for MTL7700 series as below

MTL7706+

MTL7707+

MTL7707P+

MTL7710+

MTL7715+

MTL7715P+

MTL7722+

MTL7728+

MTL7728-

MTL7728AC

MTL7728P+

MTL7729P+

MTL7741

MTL7742

MTL7743

MTL7744

MTL7745

MTL7755AC

MTL7756AC

MTL7758-

MTL7758+

MTL7760AC

MTL7761AC

MTL7761PAC

MTL7764+

MTL7764AC

MTL7765AC

MTL7766AC

MTL7766PAC

MTL7767+

MTL7778AC

MTL7779+

MTL7787+

MTL7787-

MTL7787P+

MTL7788+

MTL7788R+

MTL7789+

MTL7796-

MTL7796+

MTL7798

MTL7799

MTL705+

MTL706+

MTL707+

MTL707P+

MTL708+

MTL710+

MTL710AC

MTL710P+

MTL715+

MTL715P+

MTL722+

MTL722P+

MTL728+

MTL728AC

MTL728P+

MTL729P+

MTL751AC

MTL755AC

MTL758+

MTL760AC

MTL761AC

MTL761PAC

MTL764+

MTL764AC

MTL765AC

MTL766AC

MTL766PAC

MTL767+

MTL768+

MTL772AC

MTL778AC

MTL779+

MTL786+

MTL787+

MTL787S+

MTL787SP+

MTL788+

MTL788R+

MTL791

MTL796+

MTL799

Need more details for  MTL7706+ active / electronically protected barrier, please contact us here!
Contact details