CN2042964U

CN2042964U - Portable hydrogen ion composite eletrode

Info

Publication number: CN2042964U
Application number: CN 88211880
Authority: CN
Inventors: 江左
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-06-08
Filing date: 1988-06-08
Publication date: 1989-08-16

Abstract

The utility model discloses a pH composite electrode of a portable acidity meter for chemical analysis. Two capillary tubes in different lengths contained in a reference chamber can balance the pressures inside and outside the composite electrode to eliminate the effects of environment, air pressure and temperature. To protect a hydrated gel layer on the surface of a glass electrode, a measuring end is sheathed with a bottle shape plastic seal container; the inner wall of the bottle jack is carved with screw threads, and padded with a circular sheet seal washer; then a plastic screw whose center is provided with holes is screwed with the container. In such way the volume change generated during sealing and the pressure change consequently formed can both be eliminated. The property of the reference electrode can be maintained for long term; namely the service life is extended. The outerwall of the bottle shape plastic container is carved with scale lines, so the bottle shape plastic container can replace a trace amount test cup, used for micro determination.

Description

Portable hydrogen ion composite eletrode

The utility model belongs to the electrode to the hydrogen ion sensitivity in the electrochemical detecting instrument.Specifically, relate to a kind of pH combination electrode that is used for portable acidometer.

In prior art, the pH combination electrode of general portable acidity meter, its structure is to use encapsulant, and glass electrode is fixed in the protection tube.For easy to carry; seal at electrode leads to client; measuring junction utilizes the space between protection tube and the glass electrode; by adorning a contrast electrode; pass through a capillary and detected solution with mobile colloidal electrolyte; form colloidal solution and meet the boundary; the colloidal electrolyte of contrast electrode will be subjected to the variation of environment temperature and air pressure like this, and electrolytic solution flows out by kapillary, but inspiration is specimen solution or air; cause the concentration of electrolyte of contrast electrode to change; or air bubble rests in the kapillary, and sectional area is diminished, and resistance increases; cause the electromotive force of pH combination electrode to change instability, influence measuring accuracy and serviceable life.Moreover for the hydrated gel layer of cover glass electrode surface, the measuring junction of pH combination electrode puts a polybag that distilled water is housed when not using.Require with pH combination electrode protection tube airtight water-tight.When bagging, will produce positive air pressure like this; When pulling out bag, will produce negative pressure.By capillary channel gas in the bag and distilled water are pressed in the contrast electrode, cause the concentration change of electrolyte and the variation that liquid connects area, form the electromotive force instability of pH combination electrode, influence measuring accuracy and serviceable life.

The purpose of this utility model provides a kind of matching used for portable acidity meter, has long serviceable life and performance than stable p H combination electrode.

The purpose of this utility model realizes in the following manner, with encapsulant elastoplast or rubber, glass electrode is fixed on a protection tube center.Electrode leads to client is with epoxy resin or plastic seal.Utilize space between protection tube and the glass electrode at measuring junction, a contrast electrode is installed, electrolyte is not filled and is left the space; by the kapillary of a weak point, form liquid and meet the boundary, refill a long kapillary; be placed in the space of electrolyte top, form the electrode internal and external pressure balance like this.The variable effect of environment temperature and air pressure will be subjected to.Concentration change and the kapillary sectional area of eliminating electrolyte change, and can also make the outflow of electrolytic solution through the kapillary trace because of the liquid level difference of electrolytic solution, often upgrade liquid and connect face, keep the original premium properties of electrode.

When not using; measuring junction at the pH combination electrode; it is removable that an activity is housed; the plastic containers that excellent sealing ability is arranged, its structure are bottle-like plastic containers, are carved with screw thread such as nut shape at the bottleneck inwall; fill up a last garden shape sheet elastoplast or a rubber gasket; screw with a porose plastic screw and an above-mentioned bottle-like plastic container in center again, make the distortion of elastic washer flat compressed, force the sealing of the center of pressing to and protection tube outer wall.

During use,, screw again or loosen porose plastic screw, loosen elastic washer, can take out or insert electrode easily earlier with the stationkeeping of plastic containers.So just do not have volume change, thereby do not have the pressure variation yet.Moreover engrave a circle reticle at the plastic containers outer wall, and so can replace micro-test glass usefulness, detected solution to be poured in the plastic containers, liquid level is on reticle, and insertion pH electrode just can be done microdetermination.

Further promote as the utility model.Similar ion-selective electrode be can refer to, enzyme electrode and other biological electrode such as bacterium electrode, biological tissue's electrode, immunoelectrode or the like reached.

The utility model has the advantages that significantly because its structural design is rational.Increase long capillary and connect reference cell and extraneous communication, make pH combination electrode internal and external pressure balance, prevent that liquid from flowing backwards and avoid liquid to connect the generation of kapillary bubble, guarantees the stability of electrode.Because the liquid level difference of two capillaries makes electrolytic solution connect the kapillary trace by liquid and flows out, liquid junction boundary often upgrades, and can keep the premium properties of contrast electrode for a long time, increases the service life.The sealing of plastic containers owing to adopt first fixed position, compresses the sealing elastic washer again, does not have volume change during sealing, does not therefore also have pressure and changes, and eliminates in solution or the gaseous tension reference cell, thereby guarantees electrode quality.Moreover plastic containers also can be made micro-test glass usefulness.

Below in conjunction with a description of drawings most preferred embodiment of the present utility model.Thereby further describe details of the present utility model.

The drawing explanation of accompanying drawing:

The structural representation that accompanying drawing has been simplified for of embodiment.

Referring to accompanying drawing; the structure of portable type ion combination electrode in the present embodiment; it is the center that is fixed on plastics organic glass protection tube (3) by a glass electrode (2) with elastoplast sillicon rubber blocking (7); its upper electrode exit is by the appliance plug of adorning a sealing (1); the liquid that inserts a weak point on elastoplast plug (7) end face connects kapillary (13), links up the mobile colloid electrolyte in the reference cell.Other inserts a long pressure equilibrium kapillary (5), links up reference cell upper air position (4).At the electrode measurement end plastics organic glass container assemblies (8 that can remove arbitrarily is housed; 10); its structure is that plastics organic glass screw (8) screws in the plastics organic glass airtight containers (10), and elasticity of compression plastic, rubber packing ring (9) makes the sealing of protection tube and plastic containers water-tight.The hydrated gel layer of dress distilled water cover glass electrode surface in the plastic containers.Plastic containers (10) outer wall is carved with reticle, can adorn detected solution and make trace measurement usefulness.The used material of electrode in the present embodiment, buffer solution etc. all are to belong to general prior art, so do not repeat.

Claims

1, the compound telegram of a kind of portable hydrogen ion comprising a plastic seal pipe (3) and the cup-like containers (10) that can remove, is characterized in that the kapillary (13) of a long kapillary (5) and a weak point.

2, device according to claim 1 is characterized in that a long kapillary (5) connection plastic seal pipe (3), the pressure of balance reference cell.

3, device according to claim 1, the inwall that it is characterized in that a cup-like containers (10) has rib-loop, after screwing mutually with the ribbed plastic casing of outer wall (8), can keep sealing, the outer wall of cup-like containers (10) is carved with reticle, can be used as micro-test glass and uses.