Siemens Sitrans, LC 500 instruction manual non-hazardous area, Page, Stahl barrier 9002/13-280

Example 3

If you do not want to ground the negative connection directly, or in the case of Intrinsically Safe applications where the DCS measures the current in the negative connection, and that wire cannot be grounded, a barrier type is required as shown below.

hazardous area

Type:

Ser.:

Date:

Rev.:

Tampering voids warranty

		non-hazardous area
Stahl barrier: 9002/13-280-
	110-00 (or equal)			DCS APPARATUS
3	277	110 mA	1
	PA	28V PA
4	28V		2	Rmeas
				0 V

Interconnection

Example 4

In Intrinsically Safe applications where the DCS has galvanically separated inputs, you can use either the type of barrier shown below, or the type shown in Example 2.

hazardous area

non-hazardous area

Type:

Ser.:

Date:

Rev.:

Tampering voids warranty

Stahl barrier: 9002/01-280-

110-00 (or equal)

3	280	160 mA	1
		160 mA
4	PA	PA 2

DCS APPARATUS

ISS Ground

When Ex applications are using an Ex approved Intrinsically Safe (I.S.) power supply unit, no barrier is required and grounding is optional.

	I.S.
Type:	DCS APPARATUS
Ser.:
Date:
Rev.:

Tampering voids warranty

7ML19985GE01 SITRANS LC 500 – INSTRUCTION MANUAL Page 31