Siemens Pacemaker UM344-2 Manual do Utilizador descarregar pdf (Página 147)

UM344-2 MODEL DESIGNATION AND SPECIFICATIONS

September 1995

Power Supply

Minimum Compliance Voltage ................................+12 Vdc with no loop resistance, see Figure 4-4

Network (Current Sense or Loop)

Resistance (R

)................................................250Ω minimum, 1100Ω maximum

= 43.4V

- 520.8; where V

= power supply

voltage

Maximum Loop Voltage .........................................+42 Vdc; for Ex N use, see Section 8.3.6

Ripple ...................................................................0.2 Vp-p, 47-125 Hz

Noise ....................................................................0.6 mV RMS maximum

Impedance ............................................................10 Ohms maximum

Power Supply Effect.....................................................Less than 0.005% of output span per volt

Indication, optional .......................................................4-1/2 digit LCD with status indicators

Transmitter Input Capacitance ......................................27,000 pF, HART C

= 6; refer to section 4.3.5

Network Topology

Point-To-Point

Transmitter Quantity ........................................1

Network Signal and Connection ........................Analog 4-20 mA, single current loop; see Figures

4-1 and 4-2

Network Resistance .........................................See Figure 4-4

Multi-Drop

Transmitter Quantity ........................................1 to 15

Network Signal and Connection ........................Digital, parallel connected; see Figure 4-3

Network Resistance .........................................See Figure 4-4

Transmitter I/O Isolation

Between Input/Output Terminal...............................250 Vac

Between Case and Networking Wiring.....................250 Vac

8.3.3 Two-Wire Cable

Type ...........................................................................Twisted Single-Pair, Shielded, Copper

Conductor Size for Network Length

Less than 5000 ft. (1500 m) ..............................24 AWG minimum

More than 5000 ft. (1500 m) .............................20 AWG minimum, 16 AWG maximum

Cable Capacitance .......................................................Refer to Section 4.3.5

Recommendation .........................................................Belden 8641, 24 AWG

Belden 8762, 20 AWG

Length, Maximum ........................................................Refer to Section 4.3.5

1 2 ... 142 143 144 145 146 147 148 149 150 151 152 ... 182 183

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Siemens Pacemaker UM344-2 Manual do Utilizador Página 147