CN203037311U - Liquid level sensor - Google Patents

Abstract

The utility model discloses a liquid level sensor, which comprises: a reference line, at least one measurement line and a connecting terminal; the reference line and the measuring line are connected with the connecting terminal. The reference line and the measuring line include: a metal inner core wrapped with a protective layer for insulation except the head. The utility model has the advantages of simple structure, low failure rate, low cost and long service life.

Description

a liquid level sensor

technical field

The utility model relates to a liquid level sensor, in particular to a liquid level sensor with long life, low cost and high cost performance.

Background technique

In the automation system, there are a lot of problems about liquid level regulation, and in the control system involving liquid level problems, it is inevitably related to the use of liquid level sensors.

The current liquid level sensors on the market are accurate in measurement and easy to use, but they are relatively expensive. The use experience has proved that in a large number of applications, the liquid level sensor does not need too high resolution, as long as it can distinguish the high, medium and low of the liquid level.

Utility model content

Purpose of the invention: to provide a liquid level sensor with long service life, low cost, high cost performance and strong practicability in view of the deficiencies in the prior art.

Technical solution: In order to achieve the above purpose, the utility model provides a liquid level sensor, including: a reference line, at least one measurement line, and a terminal; the reference line and measurement line are connected to the terminal.

The reference line and the measuring line in the utility model include: a metal inner core wrapped with an insulating protective layer except the head. The protective layer is a PE layer or a PVC layer; the protective layer acts as an insulation to prevent false conduction due to contact during installation and use of the sensor.

In the utility model, the number of measuring points is consistent with the number of measuring lines. The number of measuring lines and the position of the detection point relative to the water surface are configured by the user according to the actual needs of the control system.

Beneficial effect: the utility model has the following advantages:

The utility model has the advantages of simple structure, low failure rate, low cost, long service life and convenient operation.

Description of drawings

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

Fig. 2 is the structural representation of basic line and measuring line in the utility model

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, further clarifies the utility model, and this embodiment implements under the premise of the technical solution of the utility model, and it should be understood that these examples are only used to illustrate the utility model and are not intended to limit the utility model range.

A liquid level sensor as shown in Figures 1 and 2, comprising: a reference line 1, three measuring lines: a low measuring line 21, a middle measuring line 22 and a high measuring line 23, and a connecting terminal 3; The reference line and the measuring line are respectively connected to the terminals. The reference line and the measuring line include: a metal inner core 11, and the metal inner core 12 is surrounded by an insulating protective layer 12 except the head; the protective layer 12 is a PE layer.

The working process of this embodiment is as follows:

Set the reference line 1 at the bottom, and then set it in sequence from bottom to top: low measurement line 21, middle measurement line 22 and high measurement line 23; After the core, a path is formed. Because the water contains conductive ions, the ion conduction makes the resistance between the reference line 1 and the low measurement line 21 change from infinite to measurable resistance; The voltage of 0.8V is logic 0 digitally; when the water has not passed the baseline 1, it is logic 1; the logic judges that the water level has reached a low level; The middle measurement line forms a path, and the logic judges that the water level reaches the middle level. Similarly, when the water has not crossed the metal inner core of the high level measurement line 23 head, the reference line and the high level measurement line form a path, and the logic judgment water level reaches the high level.

Claims (4)

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.

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