JPH02147912A - Detector for electromagnetic flowmeter - Google Patents

Abstract

PURPOSE:To remove matter adhering to the surface of an electrode by a method wherein a judgement is performed on a degree of effect on an output signal from the matter adhering to an electrode surface of a detector by measuring a rate of change with a measuring liquid at a rest and a power source is sup plied to a heater wire at an emergency to dry the matter by heat generated. CONSTITUTION:An electromotive force form an electrode 1 is outputted externally through a converter 2. A switching circuit 4 picks up an external output 2a to detect abnormality of a measured value. A power source circuit 3 has a capacity enough to heat the perimeter of the electrode through a heater wire 5. This apparatus is used flexibly depending on a caliber applied and a surface area of the electrode. Thus, the surface and perimeter of the electrode section are dried and an adhered portion is peeled off. This eliminates the need for removing the detector thereby achieving a higher maintainability, though not allowing temporary use thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an electromagnetic flowmeter detection device in water and sewage systems and industrial systems.

(Prior Art) The deposits on the electrode surface act as an insulator and reduce the electromotive force, which increases measurement errors and makes the measured value unstable, making accurate plant control impossible.

It is necessary to remove deposits from the electrode surface.

Solve the problem by applying power to the heater wire attached around the electrode and utilizing the heat generation effect.

[Structure of the Invention] (Means for Solving the Problems) The present invention determines the degree of influence on the output signal from deposits on the surface of the detector electrode by measuring the rate of change while the measurement liquid is stationary. This is an electromagnetic flow meter detection device that supplies power to the heater wire to generate heat and dry out deposits when an abnormality occurs.

(Operation) Use a drain valve, etc. to empty the inside of the measuring tube or stop the water.

(Example) Next, one embodiment of the present invention will be described.

As shown in FIG. 1, the electromotive force from the electrode 1 is outputted to the outside through a converter 2.

The switching circuit 4 takes in the external output 2a and detects an abnormality in the measured value. The power supply circuit 3 has a capacity for generating heat around the electrode through the heater wire 5. This is determined depending on the diameter of the aperture to be applied and the surface area of the electrode.

By doing this, the surface and surroundings of the electrode part are dried,
Peel off the adhesive.

Furthermore, it is possible to perform operations based on the judgment of two people, regardless of the rate of change.

That is, first, the output signal 2a of the converter 2 is taken into the switching circuit 4, the change rate (drift change) is measured in the switching circuit 4, the changeover switch is connected to the power supply circuit at the contact point of the switching circuit 4, and the heater wire is connected. Supply power to 5.

With the measurement liquid stationary as shown in Figure 2.

The output signal 2a of the converter 2 is input to the switching circuit 4.

A change above a certain level is detected from the rate of change (drift change) and the changeover switch is set to the power supply circuit side.

Further, the timer 8 lags behind the power supply circuit 3 by one hour.

By supplying power to the heater section, the electrode surface and surrounding area are heated.

As described in the section on means for solving the problems, if the deposits on the electrode surface are eliminated, maintenance will be improved and reliability of plant control will be improved.

[Effect of the invention] Among water and sewage plants, it can be used in places where the concentration of the measured liquid is high, such as water sludge, concentration in sewage treatment plants, and return. -Cannot be used at times.

Maintenance is improved as there is no need to remove the detector.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an electromagnetic flowmeter detection device showing one embodiment of the present invention, and FIG. 2 is a functional flow explanatory diagram of FIG. 1. 1・・・・・・Electronic:i 2・・・・・・
...Converter 3... Power supply circuit
4......Switching circuit 5......
Heater wire 6... Lining 8.
・・・・・・・Timer agent Patent attorney Nori Chika Nori Sokuma Yamashita

Claims (1)

[Claims] Electromagnetic flowmeter detection consists of a heater wire installed inside the detector lining, a power supply circuit that connects the heater wire to a power source, a zero point change rate detection circuit that detects the zero point change rate, and an electrode that applies heat to the lining. Device.