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
描述
QLEVEL⑩ SENSOR IC

阅读下载

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

QT114_06 数据手册

T₁

Figure 2-9 Twin-Level Internal Horizontal Probes

Figure 2-8 Single Internal Horizontal Probe

T₂

Figure 2-10 Coaxial Probe For Non-Aqueous Fluids

Figure 2-11 Twin-Level Coaxial Probes For

Non-Aqueous Fluids

A bare internal probe used with conductive fluids and an

in-line blocking capacitor will generate a huge, robust

capacitive response that will not readily permit the use of a

two-level probe due to signal saturation. Even the slightest

amount of bare metal exposed to the fluid will usually

generate an immediate, large response with aqueous fluids.

2.2.7 VISCOUS, CONDUCTIVE

ILMS

Highly viscous fluids, or those having a high surface tension,

and having substantial conductivity can fool some electrode

designs into thinking that there is fluid present when there is

not. This is a particular problem with external electrodes,

where the residual films of certain types of fluids inside the

container, electrically coupled to the fluid mass below, will

create a substantial capacitive response. Internal probes are

much more resistant to this effect since the fluid surface is

guaranteed to become mechanically disconnected from the

probe when the level drops. Coating the inner vessel surface

with a smooth plastic of polyethylene or PTFE often has a

very beneficial effect on this phenomenon.

2.2.6 SCALE

UILDUP

Scale buildup on internal probes, bare or insulated, is not

generally a problem since the sensor is still measuring

capacitance, not conductance, and

reduction in

conductivity around the probe will have minimal or no effect.

Probe designs should be tested for this to be certain in all

specific cases.

2.3 SINGLE LEVEL SENSING

A legitimate concern with bare metal probes is the buildup of

scale or other deposits at the entry point of the probe into the

vessel. Such deposits may create a conductive surface path

(especially if the vessel is made of metal) that may lead to

false-positive trips. If the shank of the probe at the entry point

is insulated enough so that conductive bridging cannot occur,

this problem should be alleviated.

When sensing for a single trip point, the single electrode can

be a simple horizontal strip on the outside of a nonmetallic

vessel (Figure 2-2), or an internal probe having a substantial

horizontal 'plateau' at the trip point (Figures 2-4, 2-5, 2-8,

2-10). When the strip or plateau is ‘covered’ with fluid the IC

will detect on at least the OUT1 line; OUT2 can be ignored.

QT114 R1.04/1106

1 2 3 456 7 8...14

下载PDF

与QT114_06相关器件

型号	品牌	描述	获取价格	数据表
QT114-D	QUANTUM	CHARGE-TRANSFER QLEVEL SENSOR IC	获取价格
QT114-DG	QUALCOMM	QLEVEL⑩ SENSOR IC	获取价格
QT114-IS	QUANTUM	CHARGE-TRANSFER QLEVEL SENSOR IC	获取价格
QT114-ISG	QUALCOMM	QLEVEL⑩ SENSOR IC	获取价格
QT114-S	QUANTUM	CHARGE-TRANSFER QLEVEL SENSOR IC	获取价格
QT115	QUANTUM	QT 11x Series Variations	获取价格