MTL7707P+ for switch inputs and switched outputs, 2W Transmitters (IIB gases) The MTL7707P+ is a two-channel shunt-diode safety barrier similar to the MTL7787P+, but is designed for use with group IIB gases and features built-in electronic overvolt protection allowing use with unregulated power supplies up to 35V dc. It is intended primarily as a low cost solution for driving IIB certified 2-wire 4/20mA transmitters, but can also be used with controller outputs with current monitoring, solenoid valves and switches. To protect the fuse and enable the loop to continue working, the supply current is limited automatically at 50mA should the output be short-circuited or excess voltage applied.

　　ADDITIONAL SPECIFICATION

　　Safety description

　　28V 164Ω 171mA, terminals 1 to 3 28V Diode, terminals 4 to 2

　　Supply voltage

　　10 to 35V dc with respect to earth

　　Output current

　　Up to 35mA available

　　Maximum voltage drop (at 20ºC, current not limited)

　　Iout x 218Ω + 0.3V, terminals 1 to 3

　　Iout x 20.1Ω + 0.9V, terminals 4 to 2

　　Supply current

　　Iout + 1.6mA, supply <26V

　　Limited to 50mA, supply >28V or low load resistance