Panametrics Sentinel LCT, Руководство пользователя

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Sentinel LNG User’s Manual 31
Chapter 2. Installation
2.4.9 Wiring the 4-20 mA Analog Output
The standard configuration of the flow transmitter includes an isolated 4-20 mA analog output. Connections to this
output may be made with standard 12-24 AWG (3.3 - 0.2 mm
2
) twisted-pair wiring for single conductor, and
16-24 AWG (1.5 - 0.2 mm
2
) for two conductors, but the current loop impedance for these circuits must not exceed
1000 ohms. To wire the analog outputs, complete the following steps:
1. Disconnect the main power to the flowmeter and remove the enclosure side cover.
2. Install the required cable clamp in the chosen conduit hole on the side of the electronics enclosure.
3. Locate the 26-pin terminal block (TB2) shown in Figure 28 on page 35, and wire the I/O terminal as indicated on
the label inside the wiring access cover (see Figure 10 on page 20 and Figure 28 on page 35). For a wiring
diagram see Figure 24 or Figure 25 below.
Figure 24: Analog Output Passive Wiring
Figure 25: Analog Output Active Wiring
Connector
Terminal
Flowmeter
Supply
Power
24 Volt DC
+
–
Board
Aout +
Aout –
Monitor
4/20
Load
Connector
Terminal
Flowmeter
Board
Aout +
Aout –
Monitor
4/20
Load