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Figure 9 Externally-powered 4–20 mA transmitter
1 Low-voltage block (TB1)
2 Common terminal (–)
Figure 10 Sampler controller-powered loop
1 Low-voltage block (TB1)
2 Pulse/mA input terminal (–)
Wiring for sampler program control
Electric shock hazard. Install low voltage wiring only on the right side of the high-voltage barrier. Do not
mix high and low voltage wiring.
The sampler can connect to a device to start, stop or continue sample collection when an electrical
signal is received from the device. The device can be another sampler or measurement device such
as a pH probe. When the auxiliary port is in use for pressurized sampling, connect the device to the
low-voltage connections in the module. Use a simple switch to supply the electrical signal.
Cables that connect to the TB1 terminal block and are longer than 3 meters (10 ft) must have a
shield. Connect the cable shield conductor to protective earth ground. To prevent an earth ground
loop current, connect the shield only at one end of the cable. For more information, refer to the
shield/drain signal description in
Only use a 1.31 to 0.13 mm
1. Prepare the wires as shown in
2. Connect the dry contact switch to the liquid level terminal and to the common terminal. Refer to
Figure
11.
3. Tighten to 0.23 to 0.25 Nm (2 to 2.2 in-lbs).
4. If more than 25.4 mm (1 inch) of the cable jacket is removed, install a plastic wire tie around the
wires. Install the wire tie at a maximum distance of 19 mm (0.75 inch) from the terminal. Refer to
Figure
11.
5. Tighten the cable strain relief sufficiently to keep the environmental rating of the enclosure.
14 English
C A U T I O N
Table 3
on page 16.
2
(16 to 26 AWG) wire.
Figure
11.
3 Pulse/mA input terminal (+)
4 4–20 mA transmitter
3 12/15 VDC terminal (+)
4 4–20 mA transmitter
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