CN203037311U

CN203037311U - Liquid level sensor

Info

Publication number: CN203037311U
Application number: CN 201220625632
Authority: CN
Inventors: 闻建中
Original assignee: SUZHOU NEW ASIA TECHNOLOGIES Inc
Current assignee: SUZHOU NEW ASIA TECHNOLOGIES Inc
Priority date: 2012-09-21
Filing date: 2012-11-23
Publication date: 2013-07-03
Anticipated expiration: 2022-11-23
Also published as: CN103148913A

Abstract

The utility model discloses a liquid level sensor which comprises a datum line, at least one measuring line and a connecting terminal, wherein the datum line and the measuring line are connected with the connecting terminal. The datum line and the measuring line respectively comprise a metal inner core, and a protective layer with a function of insulation wraps around the metal inner core except the head portion. The liquid level sensor is simple in structure, low in failure rate and manufacture cost and long in service life.

Description

A kind of liquid level sensor

Technical field

The utility model relates to a kind of liquid level sensor, specifically a kind of long-life, low cost, high performance-price ratio liquid level sensor.

Background technology

In automated system, the problem of regulating about liquid level is in a large number arranged, and in the control system that relates to the liquid level problem, inevitably be related to the use problem of liquid level sensor.

Liquid level sensor is in the market measured accurately, and is easy to use, but cost is higher.And use experience proves, in a large amount of application, liquid level sensor does not need too high resolution, as long as can tell the high, medium and low of liquid level.

The utility model content

Goal of the invention: be the deficiency that exists at prior art, the liquid level sensor that a kind of life-span is long, cost is low, cost performance is high, practical is provided.

Technical scheme: for achieving the above object, the utility model provides a kind of liquid level sensor, comprising: a foundation directrix, at least one slotted line, a connection terminal; Described datum line is connected with connection terminal with slotted line.

Datum line described in the utility model and slotted line comprise: metal inner core, metal inner core wrap up the protective seam with insulating effect all around except head.Described protective seam is PE layer or PVC layer; Protective seam plays insulating effect, prevents from that sensor from installing and using in the process to come in contact and the phenomenon that misleads.

Measurement is counted consistent with the radical of slotted line in the utility model.The line number of slotted line and the position of the relative water surface of check point are configured according to the control system actual needs by user oneself.

Beneficial effect: the utlity model has following advantage:

The utility model is simple in structure, and failure rate is low, cheap, long service life, and is easy to operate.

Description of drawings

Fig. 1 is structural representation of the present utility model.

Fig. 2 is the structural representation of fundamental line and slotted line in the utility model

Embodiment

Below in conjunction with the drawings and specific embodiments, further illustrate the utility model, present embodiment is being to implement under the prerequisite with technical solutions of the utility model, should understand these embodiment and only be used for explanation the utility model and be not used in restriction scope of the present utility model.

A kind of liquid level sensor as shown in Figure 1 and Figure 2 comprises: 1, three slotted line of a foundation directrix: low level slotted line 21, meta

slotted line

22 and 23, one connection terminals 3 of high-order slotted line; Described datum line is connected with connection terminal respectively with slotted line.Described datum line and slotted line comprise: metal inner core 11, metal inner core 12 have wrapped up the protective seam 12 of insulating effect all around except head; Described protective seam 12 is the PE layer.

The course of work of present embodiment is as follows:

Datum line 1 is arranged on bottommost, down up sets gradually then: low level slotted line 21, meta slotted line 22 and high-order slotted line 23; Do not form path have the metal inner core of head of datum line 1 and low level slotted line 21 when water after, owing to contain conductive ion in the water, but ionic conduction makes the resistance between datum line 1 and the low level slotted line 21 become measuring resistance by infinity; Sampling with the effect of pull-up resistor then, this result is changed into voltage less than 0.8V, is logical zero on the numeral; When water did not have datum line 1, show as logical one; Logic judges that water level arrives low level; Do not have when water that datum line and meta slotted line form path behind the metal inner core of meta slotted line 22 heads, logic judges that water level arrives meta, in like manner, do not have when water that datum line and high-order slotted line form path behind the metal inner core of high-order slotted line 23 heads, it is high-order that logic judges that water level arrives.

Claims

1. a liquid level sensor is characterized in that: comprising: a foundation directrix, at least one slotted line, a connection terminal; Described datum line is connected with connection terminal with slotted line.

2. a kind of liquid level sensor according to claim 1, it is characterized in that: described datum line and slotted line comprise: metal inner core (11), metal inner core (12) except head around parcel have the protective seam (12) of insulating effect.

3. a kind of liquid level sensor according to claim 1, it is characterized in that: described protective seam (12) is PE layer or PVC layer.

4. a kind of liquid level sensor according to claim 1 is characterized in that: measure count consistent with the radical of slotted line.