Siemens Treadmill LC 500 Manual De Usuario
7ML19985GE01
SITRANS LC 500 – INSTRUCTION MANUAL
Page 107
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mmmm
Appendix F
Certificates and Approvals
The Intrinsic Safety Specifications of the SITRANS LC 500 have been defined and
approved as follows:
approved as follows:
The SITRANS LC 500 can be directly connected to an intrinsically safe supply for
intrinsically safe applications. For non-intrinsically safe operations, such as explosion
proof, a safety barrier must be used.
intrinsically safe applications. For non-intrinsically safe operations, such as explosion
proof, a safety barrier must be used.
The operation of the SITRANS LC 500 conforms to the following:
NAMUR recommendation NE 43
This recommendation describes rules by which analog transmitters transfer their
information to DCS equipment. This information can be divided into two types:
information to DCS equipment. This information can be divided into two types:
• measurement information
For measurement information the current signal should be within the range of
3.8 to 20.5 mA.
3.8 to 20.5 mA.
• failure signalling
For failure information which indicates a failure in the measuring system
1
the
current signal should be in the range of either 0 to 3.6 mA, or 21 mA or greater.
The application will determine which of these two ranges is more desirable. The
SITRANS LC 500 can be set for 3.6 mA, or 22 mA, as required
SITRANS LC 500 can be set for 3.6 mA, or 22 mA, as required
2
.
Application
Specifications
current loop insulated from the measuring circuit
3.6-22 mA
internal capacitance
can be ignored
internal inductance
10 µH
maximum supply voltage
30 Vdc
maximum current
200 mA
maximum power consumption
1.5 W
1.
It may also signal a process level outside the Upper and Lower Sensor Limits, if
the unit has been programmed for this. For more information, see
the unit has been programmed for this. For more information, see
2.
on page 66 for details.