3 Device Description
The device is used for intrinsically safe interface electrical equipment situated in a hazardous (Ex) area with
electrical equipment situated in a safe area.
The device is designed for weighing applications requiring intrinsically safe interfacing.
This is achieved by use of double provided current and voltage limiters in the supply
circuit and barriers in the measuring and sense circuits of the device.
Schematic diagram
① Potentially explosive atmosphere
② Non-potentially explosive atmosphere
③ U
DC
= 24 V*
④ Measuring signal*
⑤ Sense signal*
⑥ Load cell supply
* These signals may only be operated with a SELV power supply unit or an evaluation
unit with SELV supply.
The unit provides the intrinsically safe interfacing of:
- 1 voltage output for the supply of e.g. load cells situated in a potentially explosive
atmosphere,
- 1 measuring voltage input from the potentially explosive atmosphere,
- 1 sense voltage input from the potentially explosive atmosphere.
This is achieved by use of double provided current and voltage limiters in the supply
circuit and barriers in the measuring and sense circuits of the device.
3 Device Description Intrinsically safe load Cell interfaces PR 1626/60, ../61
Minebea Intec EN-7
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