Datasheet > QT114_06

QT114_06

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
高通 - QUALCOMM		传感器
页数	文件大小	规格书
14页	247K
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QLEVEL⑩ SENSOR IC

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QT114_06 数据手册

Figure 2-4 Single Level Internal Planar Probe

Figure 2-5 Single Level Internal Spiral Wire Probe

T₂

Figure 2-6 Twin-Level Internal Planar Probe

Figure 2-7 Twin-Level Internal Spiral Wire Probe

Spiral wire probes have the disadvantage of not being as Coaxial probes are more expensive to make, and can have

rugged as a solid disc probe.

problems with vibration if they are not constructed robustly.

The outer cylinder should be perforated at key spots to allow

fluid to fill and drain the cavity without trapping air bubbles

inside. The outer cylinder can also be made of a wire mesh.

2.2.3 SIDE-ENTRY

PROBES

Another type is a side-entry probe (Figure 2-8), which

requires an entry point into the vessel wall, but may have the

advantage of accessibility in certain cases. These can be

made of simple metal rod, insulated in almost any plastic if

required.

The outer cylinder does not have to be coated in plastic, even

when used with water-based fluids. When used with oils, the

inner rod does not require insulation either.

2.2.5 BARE

ETAL

PROBES

2.2.4 COAXIAL

PROBES

Bare metal internal probes can be used, for example with

nonconductive fluids like oils, without difficulty. This applies

to all probe types described above.

Another type of internal probe is the coaxial probe (Figure

2-10); these are most useful with oils or similar fluids having

a low dielectric constant; the inner rod is connected to the

signal connection, and together with the outer grounded

cylinder forms a capacitor whose dielectric is either air or oil.

Keeping the gap between rod and cylinder to a minimum

increases the 'gain' of the electrode.

Bare probes can also be used with aqueous fluids, but in

these cases a 1,000pF (1nF) ceramic NPO capacitor should

be inserted between the probe and the QT114 to block DC

current flows.

QT114 R1.04/1106

1 2 345 6 7...14

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