JPH026358Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvement of an electrode device for measuring PH, etc.

As shown in FIG. 2, a conventional device of this type has a supply port 24 and a discharge pipe 25 for the liquid to be measured at the lower end of an electrode holder 23 that supports the middle part of a composite electrode 21 in a watertight manner through a packing 22. A measurement chamber 26 is provided, and an internal liquid replenishment port 28 provided above the electrode outer tube 27 of the composite electrode 21 and a tube 29 provided in the electrode holder 23 and communicating with the measurement chamber 26 are connected to a conduit 30. In order to normally connect the liquid A with There is a risk that the liquid will rise up the conduit 30 and reach the internal liquid replenishment port 28 and be mixed into the internal liquid B, and the conduit 30 must be removed every time the internal liquid B is replenished, making handling difficult. Moreover, there was a problem in that the conduit 30 was easily damaged when it was removed.

The present invention was completed with the aim of providing an electrode device for measuring PH, etc., which does not have the above-mentioned problems, and the illustrated embodiment will be described in detail below.

Reference numeral 1 denotes a cylindrical electrode holder that accommodates an internal liquid B, and a measurement chamber 4 that is connected to the lower end of the electrode holder 1 and is provided with a supply port 2 and a discharge pipe 3 for the liquid to be measured A is provided. There is. Reference numeral 5 denotes a composite electrode which is housed from the electrode holder 1 to the measurement chamber 4 with its intermediate portion held watertight through a gasket 6 at the communication port between the electrode holder 1 and the measurement chamber 4; The outer tube 7 has an internal liquid inlet 8 located inside the electrode holder 1.
A liquid junction section 9 located within the measurement chamber 4 is provided. Reference numeral 10 denotes a gasket that is tightly fitted into the upper opening of the electrode holder 1, and the gasket 10 has an internal liquid supply port 11 and a lead wire 12 of the composite electrode 5.
is supported by a close insertion support. 13 is the internal liquid supply port 11
This is a lid that can be opened and closed, and the lid 13 is screwed onto the upper end of the electrode holder 1. Reference numeral 14 denotes a tube that communicates with the measurement chamber 4 and is installed upright within the electrode holder 1, and an expandable soft cap 15 is provided at the upper end opening of the tube 14.
is tightly fitted, and when the pressure state of the liquid A to be measured in the measurement chamber 4 and the outflow state of the internal liquid B change and the liquid A to be measured rises in the pipe 14, the soft cap 15 is expanded by the compressed air in the tube 14 to increase the pressure in the electrode holder 1,
The flow of the internal liquid B flowing in from the internal liquid inlet 8 and flowing out from the liquid junction 9 may become stagnant due to the pressure difference, or
This is to prevent fluctuations and to prevent the liquid A to be measured from mixing into the internal liquid B. 16
is a ground electrode that is watertightly attached to the lower end of the measurement chamber 4 via a gasket 17;
6 is for preventing the measured value from being influenced by stray current. 18 is a tightening screw that presses the gasket 6 that supports the composite electrode 5 in a watertight manner, 19 is an O-ring for providing the measurement chamber 4 in the electrode holder 1 in a watertight manner, and 20 is an O-ring that connects the electrode holder 1 and the measurement chamber 4 together. 21 is a grounding electrode 16.
This is a tightening screw that holds down the gasket 17 that mounts watertightly.

With this structure, the lid 13 is opened and the internal liquid B is poured into the cylindrical electrode holder 1 through the internal liquid supply port 11 of the gasket 10 that is tightly fitted into the upper end opening of the cylindrical electrode holder 1. Once accommodated, the internal liquid B flows into the electrode outer tube 7 of the composite electrode 5, which is supported at the lower end of the electrode holder 1 through the gasket 6 in the middle in a watertight manner.
The liquid flows into the electrode outer tube 7 from the internal liquid inlet 8 which is provided in the upper part of the electrode holder 1 and faces the inside of the electrode holder 1, and the electrode outer tube 7 is filled with the liquid. Next, the liquid to be measured A is supplied to the measurement chamber 4 provided at the lower end of the electrode holder 1, and while overflowing from the discharge pipe 3, the internal liquid B flows out from the liquid junction 9 facing the measurement chamber 4. However, if the outflow state of internal liquid B and the pressure state of the measured liquid A change, the measured liquid A is placed upright in the electrode holder 1 in communication with the measurement chamber 4. When ascending inside the tube 14, the upper end of the tube 14 is tightly fitted with an expandable soft cap 15.
The soft cap 15 is expanded by the compressed air in the tube 14, and the gasket 10 with the lead wire 12 tightly inserted is inserted into the upper opening of the electrode holder 1, and the internal liquid supply port of the gasket 10 is inserted into the upper end opening of the electrode holder 1. 11 is closed by the lid 13, the pressure inside the electrode holder 1 increases according to the pressure of the liquid A to be measured in the measurement chamber 4, and as a result, the inside of the electrode holder 1 increases by the height of the measurement chamber 4. The pressure is higher than that in the measurement chamber 4, and the internal liquid B flowing in from the internal liquid inlet 8 of the electrode outer tube 7 of the composite electrode 5 properly flows out from the liquid junction 9 of the electrode outer tube 7 without stagnation. Moreover, since the liquid to be measured A and the internal liquid B are separated by the soft cap 15 and do not mix, accurate measurements can always be performed. There are various advantages such as replenishment of B can be easily performed by opening and closing the lid 13.

Therefore, the present invention has extremely great practical value as an electrode device for measuring PH etc. without the problems of the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention, and FIG. 2 is a partially cutaway front view of a conventional electrode device for measuring PH, etc. 1: electrode holder, 4: measurement chamber, 5: composite electrode,
6: Gasket, 7: Electrode outer tube, 8: Internal liquid inlet, 9: Liquid junction, 10: Gasket, 11: Internal liquid supply port, 12: Lead wire, 13: Lid, 14: Tube,
15: Soft cap.

Claims (1)

[Scope of utility model registration request] A measurement chamber 4 containing a liquid to be measured is connected to the lower end of a cylindrical electrode holder 1 containing an internal liquid. The electrode holder 1 is held watertight through a gasket 6 through a communication port with the measurement chamber 4, and the upper end opening of the electrode holder 1 is tightly inserted into a gasket 10 into which the lead wire 12 of the composite electrode 5 is inserted, and an internal liquid supply provided in the gasket 10. Lid 1 that opens and closes the mouth 11
The electrode outer tube 7 of the composite electrode 5 is provided with an internal liquid inlet 8 located within the electrode holder 1 and a liquid junction 9 located within the measurement chamber 4. A PH characterized in that a tube 14 communicating with a measurement chamber 4 is provided upright in the interior of the PH, and an expandable soft cap 15 is attached to the upper end of the tube 14.
Electrode devices for measurement such as.