JPS5839406Y2 - Diaphragm concentration meter detector - Google Patents

Description

[Detailed description of the invention] The present invention relates to a diaphragm-type concentration meter detector equipped with a temperature compensation function that is inserted into a test liquid and electrochemically measures the amount of specific molecules in the test liquid. The reason for this is that it has a faster thermal response and more effective temperature compensation.

FIG. 1 is a cross-sectional view of a main part showing the conventional structure of a diaphragm densitometer detector equipped with a temperature compensation function, in which 1 is a casing made of an insulator and has an opening at one end.

Reference numeral 2 denotes a diaphragm attached to the opening of the casing 1, and this diaphragm 2 and the partition wall 11 inside the casing 1. The side wall 12 of the casing 1 forms a storage chamber C1 for storing the electrolyte l.

Reference numeral 3 denotes a cylindrical electrode body attached to the partition wall 11. The structure of the electrode body 3 is such that a disk-shaped cathode electrode 31 is fixed to one end of the insulating pipe 33 so that its opening is closed, and the insulating pipe 33 It has a structure in which one end of a pipe-shaped anode electrode 32 is fixed to the other end.

In addition, the position and support structure of the electrode body 3 housed in the housing 1 are such that the cathode electrode 31 is located close to the diaphragm 2, and
The structure is such that the open end of the anode electrode 32 is fixed to the partition wall 11.

The empty space C2 of the electrode body 3 is the empty space C2 at the back of the partition wall 11.
It communicates with 3.

4 and 5 are temperature sensing elements, and one of them is selectively used depending on the usage condition.

In this case, the temperature sensing element 4 is embedded in the side wall of the housing, and the temperature sensing element 5
is attached at the tip of the cavity C2 in the electrode body 3.

Further, the lead wire 41 of the temperature sensing element 4 is drawn out through the empty chamber C3, and the lead wire 51 of the temperature sensing element 5 is led out through the empty chambers C2 and C3.

When a detector with such a structure is inserted into a test liquid, specific molecules in the test liquid pass through the diaphragm 2, and these specific molecules cause a chemical reaction between the cathode electrode 31, the anode electrode 32, and the electrolyte l. Cathode electrode 31, anode electrode 3
A current related to the amount of the specific molecule is passed between the two.

Since the magnitude of the generated current in this case depends on the temperature, temperature compensation is performed for the temperature of the test liquid based on the signal from the temperature sensing element 4 or 5.

However, the temperature-sensitive element holding structure of the conventional detector described above has the following drawbacks.

That is, since the housing holding the temperature sensing element 4 is generally made of an insulator made of synthetic resin, heat transfer is poor.

Therefore, the temperature change of the test liquid does not quickly follow the temperature sensing element.

Further, the temperature sensing element is placed in the vacant space C2 of the integrated electrode body 3.
Heat transfer is also poor when placed at

Therefore, in either case, heat transfer is poor and therefore it takes time to obtain a temperature compensated concentration signal.

The present invention provides a diaphragm-type densitometer detector that eliminates the above-mentioned drawbacks, and its feature is that the heat transfer path to the temperature-sensitive element is two paths. The purpose is to improve the transmission and thereby speed up temperature compensation.

The present invention will be explained below with reference to figures. FIG. 2 is a cross-sectional view showing an embodiment of the present invention, in which the housing 1 has two parts: an insulator part that is the electrolyte storage part 12, and a metal part that is the support part 13 of the temperature sensing element 4. It has a split structure, and both ends are connected to each other by adhesive or screws.

6 is a highly insulating and highly heat conductive thermally conductive material made of a metal oxide such as alumina or magnesia, and this thermally conductive material 6 includes a cavity C2 of the electrode body 3 and a metal body communicating with this cavity C2. The empty space C4 of the support part 13 is filled.

According to this structure, in addition to the heat transmitted through the support portion 13 , heat transmitted through the thermally conductive material 6 in the electrode body 3 is applied to the temperature sensing element 4 .

Similarly, the temperature sensing element 5 has a cathode electrode 3 at the tip of the detector.
In addition to the heat transmitted through 1, heat transmitted through metal support 13 and thermally conductive material 6 is added.

Therefore, heat transfer to the temperature sensing elements 4 and 5 is performed via a heat transfer path from two directions by the support portion 13 and the heat conductive material 6, so that heat transfer to the temperature sensing elements 4 and 5 is performed as in the conventional case. Comparatively faster.

As described above, according to the present invention, heat is transferred to the temperature sensing element through two paths, so the thermal responsiveness to the temperature sensing element is enhanced.

Therefore, temperature compensation for concentration measurement can be quickly performed, and thus concentration measurement can also be performed quickly.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part showing a conventional structure of a detector for a diaphragm type concentration meter, and FIG. 2 is a sectional view of a main part showing an embodiment of the present invention. 1... Housing, 12... Electrolyte storage part of the housing 1 (made of insulator), 13... Temperature sensing element support part of the housing 1 (metallic body) ), 2... diaphragm, 3...
... Electrode body, 31 ... Cathode electrode, 32.
... Anode electrode, 4°5 ... Temperature sensing element, 6 ... Heat conductive material, I ... Electrolyte solution.

Claims (1)

[Scope of utility model registration request] A casing having a diaphragm attached to an opening at one end, an electrolytic solution steered by the casing, a cylindrical electrode body installed in the casing so as to be in contact with the electrolytic solution, this electrode body and the above-mentioned cylindrical electrode body. In a diaphragm concentration meter detector comprising a housing or a temperature sensing element attached to one of the housings, the housing is divided into two parts: an electrolyte storage part and a support part to which the temperature sensing element is attached; The electrolyte storage section is made of an insulator, the support section is made of a metal body, and a cavity formed by communicating between the electrode body and the support section is filled with a thermally conductive material. Diaphragm type densitometer detector.