Switch isolators supply power to the proximity sensor in a hazardous area, receive a proportional current, convert input signals to digital output signals and transfer switching signals to a control device such as DCS or PLC.

The switch isolator consists of three primary components: the power supply, the transistor switch amplifier and the output stage. Galvanic isolation separates the input, output and power supply circuits.

The isolator input stage is designed in accordance with DIN EN60947 （NAMUR）. This means the residual voltage in normal operation is approximay 8 VDC and the short circuit current is approximay 8 mA. The switch points are typically between 1.2-2.1 mA.

Many Pepperl Fuchs isolators offer optional lead breakage and short circuit monitoring （activated by slide switches） for the hazardous area circuit. These isolators feature three outputs that can be reversed using the mode of operation switch: relay, active transistor and passive transistor outputs.

倍加福开关放大器介绍：

产品	简介
Switch Amplifier HiC2821	1-channel isolated barrier, 24 V DC supply （bus powered）, Dry contact or NAMUR inputs, Relay contact output, Fault relay contact output, Line fault detection （LFD）, Up to SIL2 acc. to IEC 61508
Switch Amplifier HiC2822	2-channel isolated barrier, 24 V DC supply （bus powered）, Dry contact or NAMUR inputs, 2 relay contact outputs, Line fault detection （LFD）, Up to SIL2 acc. to IEC 61508
Switch Amplifier HiC2841	1-channel isolated barrier, 24 V DC supply （bus powered）, Dry contact or NAMUR inputs, 2 passive transistor outputs, Line fault detection （LFD）, Reversible mode of operation, Up to SIL2 acc. to IEC 61508
Switch Amplifier HiC2842	2-channel isolated barrier, 24 V DC supply （bus powered）, Dry contact or NAMUR inputs, 2 passive transistor outputs, Line fault detection （LFD）, Reversible mode of operation, Up to SIL2 acc. to IEC 61508
Switch Amplifier HiC2851	1-channel isolated barrier, 24 V DC supply （bus powered）, Input for dry contacts or SN/S1N sensors, Active signal output, Passive signal output （NAMUR compatible）, For usage in accordance with ISO 13849-1, Line fault detection （LFD）, Up to SIL3 acc. to IEC 61508
Switch Amplifier HiD2821	1-channel isolated barrier for ESD applications, 24 V DC supply （bus powered）, Dry contact or NAMUR inputs, 2 relay contact outputs, 2 fault relay contact outputs, Line fault detection （LFD）, Up to SIL2 acc. to IEC 61508
Switch Amplifier HiD2822	2-channel isolated barrier, 24 V DC supply （bus powered）, Dry contact or NAMUR inputs, 2 relay contact outputs per channel, Line fault detection （LFD）, Up to SIL2 acc. to IEC 61508
Switch Amplifier HiD2824	4-channel isolated barrier, 24 V DC supply （bus powered）, Dry contact or NAMUR inputs, 4 relay contact outputs, Line fault detection （LFD）, Up to SIL2 acc. to IEC 61508
Switch Amplifier HiD2842	2-channel isolated barrier, 24 V DC supply （bus powered）, Dry contact or NAMUR inputs, 2 passive transistor outputs per channel, Line fault detection （LFD）, Up to SIL2 acc. to IEC 61508
Switch Amplifier HiD2844	4-channel isolated barrier, 24 V DC supply （bus powered）, Dry contact or NAMUR inputs, 4 passive transistor outputs, Line fault detection （LFD）, Up to SIL2 acc. to IEC 61508

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