JPH0346554A - Ion selective combination electrode of fail-safe - Google Patents

Abstract

PURPOSE: To detect internal rupture of an electrode itself by constructing an ion selective combination electrode comprising an ion selective electrode to deliver a signal when the output from the electrode deviates from A predetermined range. CONSTITUTION: An electrode 10 comprises an ion selective electrode 12 and a reference electrode 14 while a unit 46 comprises a control circuit and an alarm circuit. The electrode 12 comprises an ion selective glass ball 18 connected with a glass stem 16 and a solution 20 is encapsulated in a case represented by the stem 16 and the ball 18 with a billet 24 of silver chloride being suspended by a silver wire 22 in the solution 20. Furthermore, a billet 36 of silver chloride is suspended by a wire 34 in a standard solution 32 of the electrode 14. In an ordinary case where the electrode 10 is employed in a test solution 42, pH is set within a safety range by a unit 46 and monitored thereat. When the system 16 is ruptured, the voltage goes to 0 and an alarm circuit in the unit 46 delivers a signal to alarm deviation from a safety operation range.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ion-selective combination electrode, and more specifically to a device capable of detecting self-dielectric breakdown and notifying it with a signal. be.

It operates over the entire pH range, with an output of approximately -60 millivolts (mV) per 11 H unit, and when the pH is 7.0, the output is Qn+V. electrodes are known. It is also known to shift to the 0+nV point for pH 4.0 or 10.0 by varying the distribution of the internal solution so that the automatic temperature does not correct the metering circuit.

It has been found that an ion-selective combination electrode that has an output of OmV when the ion concentration is out of a preferred range, such as the OmegapH, will detect internal self-breakdown of the electrode itself.

A preferred example of the Hamaguri Keishu A Bow U Gentsu is shown in the following figure, along with a description of its construction and operation.

l-belly A preferred embodiment thereof is generally indicated at 10 in the figures.

The ion-selective combination electrode 10 has two functional parts: an ion-selective electrode, generally designated 12, and a reference electrode, generally designated 14.

The ion-selective cell 112 has a glass stem 16 connected to an ion-selective glass bulb 18.

A container, indicated by stem 16 and bulb 18, contains a solution 20 in which suspends a silver wire 22 and a billet 24 of silver chloride. The internal solution 20 consists of 1.8 moles of potassium chloride and 0.05 moles of phthalate, i.e. potassium acid phthalate (Po
tassium Ac1deP hthalate)
(Merck, AR-grade standard), bring the total volume to 1 liter with non-ionized water, and adjust the final pH with NaOH.
This is a solution with a pH of 5.0 made by adjusting the Seal 26
is secured around the tubular portion 16 and the wire 22.

The bushing 28 has a liquid communication port 30 through which liquid flows, which bushing connects the electrode 12 to the electrode 14.
It is a ring that is fixed inside. The latter part, i.e. Bush 2
8 is a standard solution 32 of a reference electrode according to the prior art.
is included. A silver wire 34 extends into the solution 32 and a silver chloride billet 36 hangs from the wire. Seal 38 is annular and secures wire 34 and the picture electrode around it.

A container 40 containing a solution 42 whose pH is to be monitored is shown.

Wires 22 and 34 connect to an amplifier, which provides a voltage output that reflects the input from the two wires. The unit, generally designated 46 in the diagram, has a control circuit and an alarm circuit, which provides a warning signal when the voltage is O;
1] so that the desired voltage of the optical window is within the range of 1]
When I4 is 5.5, it is programmed to be Opol I.

The outer wall 48 walls both the reference electrode 14 and the section 50 and seals off electrical contact therethrough so that the test solution can come into contact with the bulb 18 and the port 30 at the section 50 (through-out). ball not shown).

The following chart compares the preferred embodiment to the prior art referenced above: When a combination electrode is normally used in a test solution 42, the pH is within the safe range set by the unit 46. and is monitored there. When the tube 16 ruptures, the voltage becomes O, which in the present invention is outside the safe operating range, or within the optical window operating range, and the signal circuit within the unit 46 will issue that signal. The signal may also be emitted at other voltages outside the preferred range of the optical window.

For those skilled in the art, other embodiments are also possible within the scope of the claims.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a preferred embodiment of the present invention. (4 other people)

Claims (1)

[Claims] 1. An ion-selective combination electrode comprising an ion-selective electrode, the electrode comprising a container, a liquid in the container, an ion-selective element in the liquid, a reference electrode, and a control device. , and a combination of electrodes in which the device emits a signal if the output from the electrodes falls outside a predetermined range. 2. Claim 1 in which the sensitivity is with respect to pH
Combination electrodes as described in Section. 3. The combined electrode according to claim 2, wherein the output is a voltage of 0, and the voltage of 0 is outside the range.