MTL7706+ active / electronically protected barrier high quality product with good price for sale
MTL7706+ product description
MTL7706+ for 'smart' 2-wire 4/20mA transmitters
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
45mA typical at 20mA and 24V supply
60mA maximum at 20mA and 20V supply
Other related models for MTL7700 series as below
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HONGKONG XIEYUAN TECH CO., LIMITED
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