JPH01105150A - Abnormality detecting method for clogging point meter - Google Patents

Abstract

PURPOSE:To enter measuring operation speedily by confirming previously whether or not a sample can be sucked by a sucking means to specific height before the sample in an analytic cell is cooled by using a liquid level sensor, etc. CONSTITUTION:The clogging point meter consists of the liquid sample 1 to be measured, the analytic cell 3, a cooler 4, a thermocouple 7, a filter 8, the liquid level sensor 10, and a sensor amplifier 15, etc. Then the sample 1 injected into the cell 3 by a specific amount is sucked through a valve 14 while not cooled and the sensor 10 checks whether or not the sample 1 is sucked to a height of 200mm from the bottom part of the cell 3. Then it is judged that the equipment is normal when the detection output of the liquid level is obtained by an amplifier 15 and following normal measuring operation is entered, but when the detection output is not obtained, the equipment is judged to be abnormal and checked. Thus, early-stage operation is entered at its early stage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for detecting an abnormality in a clogging point meter.
The present invention relates to an abnormality detection method for detecting an abnormality in a sensor for detecting the liquid level of a sample, a suction mechanism, etc. in a clogging point meter that measures the liquid level of a sample.

(Conventional technology and its problems) Clogging point meter is used in fields such as 1 oil lamination.

It is known as an analyzer that measures the temperature at which petroleum products such as diesel oil become clogged.

The measurement principle and procedure will be explained based on FIGS. 3 and 4. First, as shown in FIG. 3, a sample 1 to be measured is injected into an analysis cell 3 via a supply path 2. Here, a cooler 4 is provided below the analysis cell 3, and each analysis cell 3 has an overflow pipe 5. A discharge path 6 and a thermocouple 7 are provided. Furthermore, a filter 8 is provided inside the analysis cell 3.

Next, the cooler 4 is operated with the analysis cell 3 open to the atmosphere, and the temperature of the sample 1 is measured by the thermocouple 7. Then, each time the temperature of the sample 1 decreases by 1 degree, the sample 1 is transferred to the suction path 9.
As shown in FIG. 4, for example, L=200-
A photoelectric liquid level sensor 10 installed at a height of 1 detects whether the sample L can be sucked up to the height L within a certain period of time.

As the temperature of the sample 1 decreases, the temperature at which suction to the height L becomes impossible within a certain period of time is detected, and this temperature is recorded or displayed as the clogging point of the sample 1 as appropriate. After detecting the clogging point in this way, the cooler 4
Switch to the heater to restore the temperature of sample 1, analysis cell 3, etc.

Sample 1 is injected again and the measurement is repeated.

However, in the conventional measurement method described above.

For example, if the liquid level sensor 10 or the suction mechanism (not shown) malfunctions, these abnormalities will only be discovered after sampling the sample 1, cooling it with the cooler 4, and then actually suctioning and measuring the sample 1. It was something to do. For this reason, if an abnormality is found, the cooling process for the sample 1 up to that point becomes completely wasteful, and there is a drawback that time is wasted before starting the actual measurement work.

The present invention was proposed to solve the above problems, and its purpose is to enable early detection of abnormalities in various instruments and equipment, such as liquid level sensors and suction mechanisms, before cooling the sample. An object of the present invention is to provide an abnormality detection method in a clogging point meter that allows normal measurement work.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides that, when measuring the clogging point of petroleum products, etc., the sample is drawn to a predetermined level by suction means before the sample is cooled in the analysis cell. It is characterized by confirming in advance whether or not suction can be performed up to a certain height using a liquid level sensor or the like.

(Function) According to the present invention, before cooling the sample, the sample is sucked through the filter, and it is confirmed by the liquid level sensor whether or not the sample can be sucked to a predetermined height.

If suction is successful, the process moves on to the original clogging point measurement of sampling, cooling, and suction of a new sample, and if suction is not possible, something must be done to the suction mechanism such as a pump or the liquid level sensor. We judge that an abnormality has occurred and perform these inspections.

(Example) An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 schematically shows the configuration of a clogging point meter to which the present invention is applied, and there is no substantial difference from that shown in FIGS. 3 and 4.

That is, in FIG. 1, 1 is a liquid sample such as petroleum product whose clogging point is to be measured, 2 is a supply path for sample 1, and 11 is a liquid sample such as a petroleum product whose clogging point is to be measured;
is a supply valve consisting of a three-way valve, 3 is an analysis cell, 4 is a heater that can also be used, 5 is an overflow pipe, 12
is an overflow valve, 6 is a discharge path, 13 is a drain valve, 7
A suction valve consisting of a thermocouple, 8 a filter, 9 a suction path, and 14 a three-way valve connected to a suction mechanism such as a pump (not shown).

10 is a liquid level sensor consisting of a photointerrupter or the like; 15 is a sensor amplifier; and 16 is a trimmer for adjusting its sensitivity.

In measuring the clogging point of sample 1 using this clogging point meter, the following procedure is followed.

First, the supply valve 11 is opened and a predetermined amount of the sample 1 is injected into the analysis cell 3 from the supply path 2. °Next, the sample side flow path of the supply valve 11 is closed and the other side is opened to open the analysis cell 3 to the atmosphere, and the sample 1 is aspirated at a predetermined negative pressure via the suction valve 14 and the suction path 9. do. At the same time, the liquid level sensor 10
Therefore, sample 1 is L = 200 m from the bottom of analysis cell 3.
Check whether it is sucked up to a height of m. At this time, it is necessary to aspirate the sample 1 without operating the cooler 4 and without cooling the sample 1.

In other words, if the suction of the sample 1 is performed normally at this stage and the sensor amplifier 15 obtains a liquid level detection output, then the functions of the suction mechanism, liquid level sensor 10, etc., and instruments are normal. It is determined that there is, and normal measurement work begins. Conversely, if the detection output of the liquid level cannot be obtained, it can be determined that the function of the above-mentioned equipment, etc. is abnormal. I do.

The above-mentioned abnormality detection work will be performed multiple times, and if an abnormality is detected multiple times in a row, it is planned that an alarm such as negative pressure abnormality or liquid level sensor sensitivity abnormality will be issued. .

In addition, in this clogging point meter, as shown in Fig. 2, sample injection (period tz) and cooling (period tz) are repeated, but during normal operation as shown by Pl in the same figure, By memorizing the temperature pattern in advance and constantly measuring the temperature of the sample with the thermocouple 7 (see Figure 1),
It is possible to detect a sampling failure as shown by P2 in FIG. In other words, for a clogging point meter,
Sludge, etc. in the sample may clog the valve and cause it to malfunction.
Although this may cause sampling failure, by storing the normal temperature pattern and constantly comparing it with this as described above, it is possible to detect sampling abnormality at an early stage and deal with it.

(Effects of the Invention) As described above, according to the present invention, when measuring the clogging point, the suction process before cooling the sample confirms whether or not the sample can be suctioned. It is possible to detect abnormalities in various devices such as sensors and instruments at an early stage, and to quickly respond to inspections of these.
This has the effect of allowing an early transition to the clogging point measurement work with various devices etc. in a normal state.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a clogging point meter to which an embodiment of the present invention is applied, Fig. 2 is a graph showing the temperature pattern of a sample, and Figs. 3 and 4 are diagrams of a clogging point meter. FIG. 2 is a schematic configuration diagram for explaining the measurement principle. 1...Sample 3...Analysis cell 8...Filter 10...Liquid level sensor 15...Sensor amplifier patent applicant Nippon Mining Co., Ltd. Electrochemical Instrument Co., Ltd. Figure 2

Claims (1)

[Claims] The liquid sample injected into the analysis cell is cooled, and the sample liquid level detection means confirms that the sample can be aspirated to a predetermined height by the suction means through the filter, and the liquid level detection means confirms that the sample can be aspirated to a predetermined height by the suction means through the filter. In the clogging point meter, the clogging point of the sample is determined by the temperature of the sample at the time when the sample is cooled. A method for detecting an abnormality in a clogging point meter.