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Pin/signal
Description
Common
AS950 power supply negative return.
When the AS950 sampler is powered
by an AC/DC converter, this pin
connects to earth ground.
Shield/drain
The shield is a connection to earth
ground when AC power is supplied to
a sampler to control RF emissions
and susceptibility to RF emissions.
Plumb the sampler
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
Potential Electrical shock and fire hazards. The drain line must be connected to a drain system that is
at ambient pressure.
Plumbing guidelines:
• Install the plumbing as near to the sample source as possible.
• Make the intake tube as short as possible.
• Keep the intake tube at a maximum vertical slope so that the tube fully drains between samples.
• Make sure that the intake tube is not pinched.
• Make sure that the drain lines are at zero pressure.
1. Refer to the installation documentation for the applicable sampler to connect the tubing to the
sampler.
2. Connect the tubing from the sampler to the ball valve. Make sure that the inlet tubing is above the
ball valve so that the sample drains fully. Refer to
Pressurized sample precautions for an AWRS
Electrical shock hazard. If a pressurized sample line is plumbed to an All-Weather Refrigerated
Sampler (AWRS) that has a compartment heater, a sample leak can cause sufficient water to collect
under the cover to touch the heater. Make sure there are no blockages in the center cable slot of the
AWRS so that leaks can drain.
For an AWRS with a compartment heater, make sure that a sample leak under the cover can drain.
Remove the foam plug or cable from the center cable slot. Refer to
3
All mains powered equipment that connects to the module terminals must be NRTL listed.
Table 3 TB1 terminal block description (continued)
3
Rating
The shield is not a safety ground. Do not use the shield
as a current carrying conductor.
Connect cables that are more than 3 m (10 ft) to the
shield pin.
Only connect the shield wire to earth ground at one end
of the cable to prevent ground loop currents.
D A N G E R
D A N G E R
Figure 2
on page 6.
D A N G E R
—
Figure
12.
English 17
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