Siemens Pacemaker UM344-2 Manuel d'utilisateur télécharger pdf (Page 47)

UM344-2 INSTALLATION

September 1995

Ÿ Individual miscellaneous hardware must meet the following requirements:

Ÿ Capacitance to Ground ................ 50 pF maximum

Ÿ Resistance to Ground ................. 1 MΩ minimum

Ÿ Impedance if Series Connected ................ Less than 10Ω

Ÿ Impedance if Parallel Connected .................. Greater than 50kΩ.

Ÿ The maximum number of miscellaneous devices per Network is 16. The combined electrical

characteristics may not exceed the following:

Ÿ Maximum capacitance to ground ................ 800 pF

Ÿ Minimum resistance to ground ................ 62.5kΩ

Ÿ Maximum series impedance ................ 160Ω

Ÿ Minimum parallel impedance ............... 3125Ω

4.3.9 Determine Sensor Cable Requirements

If the Transmitter is mounted remotely from the sensor, the wire characteristics of the extension cable

between the sensor and Transmitter will be different for thermocouple inputs than for RTD, ohm, or

millivolt type inputs.

A. Thermocouple Sensor -to-Transmitter Extension Cable:

1) Select extension grade or thermocouple grade wire of the same calibration as the thermocouple:

calibrations are T, J, E, K, R, S, N, B.

• THERMOCOUPLE GRADE: Wire is made from same materials as thermocouple and

subject to same limits of error as thermocouple.

• EXTENSION GRADE: Noble and refractory thermocouple extension grade wire is made

from inexpensive proprietary alloys that simulate the thermoelectric behavior of the actual

thermocouple element over a limited range of temperatures.

Base metal (T, J, K, E) thermocouple extension grade wire is made from the same materials

as thermocouple wire; however, its use is restricted to a lower range of temperatures.

For extension grade wire, the ambient temperature at the thermocouple head connection point

may not exceed the temperature limits of the extension wire.

2) Cable Recommendation: FEP insulated and jacketed, twisted and shielded. Wire size

should be 16 to 20 AWG.

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Siemens Pacemaker UM344-2 Manuel d'utilisateur Page 47