Siemens SITRANS P500 Notice De Service page 11

CAUTION
Cable damage
Insulation on cables can be damaged if they are used in elevated ambient temperatures. For this reason, if cables are to be
operated in an ambient temperature T ≥ 60 °C, use heat-resistant cables approved for an ambient temperature at least
20 K higher.
Also, ensure that you use appropriate cables for operation in low temperatures.
WARNING
The inlet openings for the electrical connections must be sealed. For this purpose, use only cable glands or plugs that are
suitable for the type of protection that is required.
Special explosion protection
WARNING
Intrinsically safe circuits
Only connect the device to certified intrinsically safe circuits. These circuits must comply with the technical data indicated
on the nameplate or in the certificates and approvals (e.g., EC type-examination certificates).
If the circuits do not comply with the information in the certificates and approvals, the safety required for the approval is
longer guaranteed.
Cables for use in hazardous areas in Zones 1 and 2 or 20, 21 and 22 must satisfy the requirements for having a test
voltage ≥ 500 V AC applied between the conductor/ground, conductor/shield and shield/ground.
Note
To improve the reliability:
● Install the signal cable separately from cables with voltages > 60 V.
● Use cable with twisted strands.
● Stay away from large electrical systems.
● Use shielded cable to guarantee the full specification according to HART.
● Connect a load resistor of at least 230 Ω into the signal circuit in series in order to guarantee fault-free HART
communication. When power supply isolators are used for HART transmitters, e.g. SITRANS I, a load resistor is already
installed in the device.
Connecting the device
Procedure
1. Unscrew the cover of the electrical cable compartment.
This side of the housing is marked "FIELD TERMINALS".
2. Insert the connecting cable through the cable gland.
3. Connect the device to the existing protective bonding circuit.
4. Connect the wires to the connecting terminals "+" and "-".
Observe the polarity when doing this. If necessary, ground the device using the "-" connection.
5. If necessary, ground the shield to the screw of the ground terminal. This is electrically connected with the external
protective conductor connection.
6. Screw the cover back on as far as it will go.
SITRANS P500 with HART
A5E02344532-02, 09/2010
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