JPS5917144A - Galvanic cell type oxygen concentration meter - Google Patents

Abstract

PURPOSE:To obtain an oxygen concn. meter having along service lefe by using a metal (oxide) capable of reducing oxygen highly actively as a positive pole and lead as a negative pole of lead and using a mixture of propionic acid and alkali metallic salt or NH4 salt of an organic acid and lead compound as an electrolyte. CONSTITUTION:The positive pole 1 is a Pt plate, etc. capable of reducing oxygen highly actively, the negative pole 2 is lead, the electrolyte 3 is the mixed solution of the organic acid such as propionic acid and organic acid alkali metallic salt such as potassium propionate or NH4 salt and lead oxide. A diaphragm 4 consisting of copolymer of F2C=CF2 and H2C=CH2 is fixed to a holder 6 made of PVC resin by an O-ring 5. By measuring both end voltages of a resistance 7 between the poles 1 and 2, O2 amount transmitting through the diaphragm 4 is measured to measure O2 concn. in outer atmosphere of the diaphragm or in the solution. Thereby, H2 is not generated, precipitation of lead carbonate due to CO2 in the detecting gas is prevented, the solubility of the lead oxide is increased, and the service life is prolonged remarkably than that of conventional oxygen concn. meter using alkali electrolyte.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a galvanic device 7 (related to the modification of type 1 oxygen concentration 81), and its purpose is to be unaffected by carbon dioxide scum contained in the detected gas, and Long-life oxygen p l
'l: Calculate the total 111: It's completely there.

Calvany 11 (northern type oxygen 711 degree cylinder is generally easy and cheap fil + I), kaIf';fa, so it is used in a wide range of fields.
Gold 11be to f(ro+E bfJ(
and the negative l111+ made of lead and IW;s・r modified and f(
Ro'yama Niike de+/41 Bogi] 1, iE l "J tg
, It takes advantage of the fact that there is a q-resistance between the 1-■ flow flowing there and the oxygen concentration 1 yen by connecting a resistance of 1 sq.

Conventional galvanic Ii curve? There are two drawbacks to densitometers. One is that the sensor has a very short lifespan of 6 to 10 months, and the sensor must be replaced with a new one once or twice a year.

The other reason is that in a detection gas containing carbon dioxide gas with a relatively high gradient, there is no jump or the /li becomes short.

This is due to the fact that an aqueous solution of 1b potassium hydroxide or 1b sodium hydroxide is used as the electrolyte.

Please explain this point below.

In this case, in IE-, 02 + 2H, 20+4e −+ 40) l
-(11 reactions occur, and in a fight 2ρ1=1-4(sword"--29bO+ 2LL+0-1
40m 0. (2) The reaction becomes r4 . Negative temple 1 reaction product J) 9 b U is 1) Newness is the first thing. However, '11j solution is 1 same reaction 14:, W, the large color screen is saturated with things, negative 16
The overvoltage of Ha is 1 (9 times the ML that flows between the city prayer and the negative whisper changes, and the constant 1v4 relationship between oxygen 4 and electric ml collapses), The meter runs out of 6a.

Conventionally, an alkaline aqueous solution was used to prepare the liquid.
II+, is the lifespan of the formula acid I concentration meter? 1 This is @
PbU, an amphibiotic acid, is dissolved in alkaline water at a concentration of 0.1 mol/5 t per ton of IW.
IQ: small and f 4. C.

-The detected gas contains a relatively large amount of carbon dioxide]
When it is negative 1, +'+il K's equation (2) shows that 2PbU is born 1 year old +1 2iff, and the lead carbonate (pl+cUa) or the lead carbonate (Pb
20B(OH) 2 ) is generated and the overvoltage of the quotient increases significantly, and the oxygen concentration becomes impossible.

The invention is unique to A2, which eliminates the above-mentioned disadvantage of the conventional oxygen concentration of 4 tons.

Nagano Life is affected by carbon dioxide gas, and the conditions necessary for electrolysis of lead oxide, which is a reaction product, are first discussed in the electrolysis of lead oxide, which is a reaction product. There is no hydrogen generation from combustion.

In order to satisfy these conditions, the exporter, etc. may also use a mixed aqueous solution of propylononic acid and alkali gold [7] or a mixed aqueous solution of an organic acid salt of ammonia and a lead compound. .

This aqueous solution will be explained below.

In this case, 113 IJJI uses an acidic electrolyte in the Lubanian oxygen Z@meter. In this case, 02-1-4H-4-4e -
+ 2H-20-=・(31 negative addition, 2Pb + 2
J120 →2PbU+4fl +4e...(
A reaction 41 occurs, and lead oxide (PbO) is produced in the same manner as in the case of using an alkaline electrolyte.

The ld solubility of lead oxide in propionic acid water is 1.
5 mol/e and its 15 for alkaline electrolyte
It's double.

In other words, the galvanic oxygen Ii waterfall meter, which uses propionic acid as a solution, has a lifespan 15 times longer than the conventional one. To explain the head, correct % + each hydrogen generation equilibrium type (ff is missing (5
) is given by the formula.

5) Kokote, E H...Hydrogen bioequilibrium at 25°C? L IffPl-1≧...Hydrogen pkfi, P8 pkfi of electrolyte 1. )
(In the 51st people, P is small, tl is small,
iE tM hydrogen generation equilibrium loading is visible, so it t
Moss 1 [[Hydrogen is easily generated from the moss. A common liquid with a small p such as a propionic acid water bath liquid is called rli: release and -
r, especially if the oxygen concentration of the detected gas is low, especially oxygen 71 + i
Since the electric current of i''E1 is quite base in Qe, hydrogen is likely to be generated.

On the other hand, if the pH increases, the hydrogen generation rate i in the IF picture becomes r
7K Bl becomes base, making it difficult to generate hydrogen.

Therefore, by adding organic acid salts of alkali gold or ammonia, such as propionate, acetate, oxalate, complex acid salts, citrate, etc., the pH of the solution increases. The dog is listening.

At this point, the Ph3 of the RH becomes larger than 7 and shifts to the alkaline side [If it reaches 7, it will be affected by carbon dioxide gas, so the pH should be set to 7F or higher, preferably 4 to 65. It is important to do so.

However, if the Ph5 of the [7 solution is in the range of 4 to 65, there is still a risk of hydrogen generation. -10,000, the equilibrium potential of lead is expressed as /X'11, ""l]/Pb" = -0,1367+0.02961
o(<(Pb″)(Vvs SUE)=(61? K P + at knee 0)/P b +l...25°
Equilibrium of lead at C'+5ii1(PI) j ・
...It can be seen that the greater the amount of active crushed lead ions added to the electrolytic solution, the better the potential of 3 liters, in other words, the potential of positive 1 and other degrees becomes more beneficial. That is, lead balanced 4V
If lead ions are added to the above-mentioned mixture rPJM until hydrogen becomes better than γ, hydrogen will never be produced.

Lead ions are, for example, acids (?, G, propionro!!
FMS I with lead or acetate beaten lead compound 11
JII Sai 11. Bye.

However, the amount added decreases as the hydrogen production reaches the minimum level required to reduce hydrogen production at the same time.
Ru.

In this way, I got IQ+! ++(, + column: 71 mixture of 2 mol/e propionic acid, 35 mol/C potassium brobionate and 01 mol/4 1η oxide, (e
P8 of 41Pi is 6.25, hydrogen-d when co(J)
Raw 'lI opposition'jTt 67 is -0,6' I V (v
S8UE ), y equilibrium ° "1" is -1,60V (
vs 8CE) and r, (11, this O) ^4 In the combined M solution, 5 of the equilibrium potential of lead or hydrogen generation equilibrium electric potential) tl than γ
Therefore, it is impossible for hydrogen to be generated from IE. The bath liquid is also affected by acid FI: f, and carbon dioxide gas Q].

2. Calbani city type 2111 oxygen ki according to the present invention 1 yen
Explaining the reason for the direct solution to the equation, 1.
For the sake of explanation, an embodiment will now be described in detail with reference to the drawings.

FIG. 1 shows a V Luno Maniden 111 according to an embodiment of the present invention.
A schematic diagram of the cross-sectional structure of the J Civil Oxygen Beta Meter is shown in Figure 1-1 (1
1 is a platinum plate with one color and rCro) diameter 5, (2) is a negative I
Lead to become IIk, (81 is a mixed aqueous solution M of 2 [J / e propionic acid and 3.5 mol / e potassium propionate and O 1 mol / e lead oxide, (41 is tetrafluoride) I'% made of ethylene-ethylene ethylene polymer with a distance of 20μ 1
1! L, (51 is a J-ring, (7) is +EptI!H1, which fixes the Si1141%11 ring (4) to a halter (6) made of a hollowed vinyl tree 11. - (2).

Detection 71 The oxygen in the body permeates through the septum @ (4) and causes Ichigin (11
When the surface of 0 is 1 year old, a reaction according to the above-mentioned formula (3) occurs in the iE meat, and it permeates and flows from the tunshikaichimo (1) to the negative face (2), which corresponds to the atmosphere of oxygen. . Therefore, resistance (7
) by oiling the garages at both ends of the
In other words, it's all about knowing oxygen 411.

Next, I checked the effectiveness of the mixed electrolyte on Akira Kio.
: I product 17, free time 4 mol/e potassium hydroxide 71 (solution 2C (: ``11 solution (Al, (Bl and 2 mol/e according to the present invention and propionic acid and 3.5 mol) /e
Mixed aqueous solution of potassium propionate and 061 mol/l lead oxide 2 CCfe electrolyte 0, Φ) Two types of oxygen concentration meters were manufactured 12, 4 and LCI in air (
I3) and (1) were tested in a mixed gas of 21% oxygen, 10% carbon dioxide, and 69% nitrogen.
The results shown in Figure 2 are obtained.

From Figure 2, the oxygen concentration -11 that is accelerated is 5 J in the atmosphere.
r months θ) Lifespan (A) No carbonate scum or 10% soil content
In the case of L, it will take less than 2 months (f life (BI L, compared to fleeting, non-invention 1).
Jj'e tl (IQI IN and oxygen Q Il [total tc+, to+ number, carbonic acid jj's 11 nothing +l!
c < 1%-ff Life! I understand the power of doing it.

I will explain in detail below, T Koyu 1, misfire (1j 4 is the power of Atsushi no Mikoto)
Garno 〈2'〈lI-
41 formula oxygen solution 1 history 81 is dusted with reptile Ij-romono, its king pi value irj 1. IB is big.

[Brief explanation of drawings]

Figure 1 shows a schematic diagram of the cross-sectional structure of the present invention - Real Goose (1st January) Reno's ``W Pond Type Oxygen Horizontal I!, ++'';A
2:1. Compare the results of wiping between the conventional product and the product of the present invention.
Negative seaweed, 3...1'[畔'tl +4...
rs smell, 5...--O-link, 6...
- Holter 7...Resistance, A, Is...Conventional product, C, +3...Invention product. Agent Patent Attorney Suzuki, Akikata 1 Matsuoka 7 Inko Machi (R) Ding &, -'t: ? 13 'iK'jij-2 (from:
ffn) Showa 57+V: November 11 [1 1'1 Director-General of the Agency 1, "Jj l'l Display Showa 574 [Special Patent Application No. 6'1 Application No. 1278°C)" 2, name of invention Culver-battery type rlIi Sakuran Gourd G1 Representative Right 711 (Shin Su l, (15, Supplementary 11σ Edge・1℃ Specification i't1 I14+R'l Scope of Claims' and 'Detailed Description of the Invention' Column 6, Contents of Amendment (1) ) Specification σ) Claims below)
Jru. [A metal or metal oxide with high activity in reducing oxygen is used as the positive electrode, and lead is used as the negative electrode. Galvanic cell type oxygen hot stone h1゜] for measuring enzyme depth in gas or solution, characterized by being made by using an aqueous solution of an acid salt and a lead compound as an electrolyte. ) Details; S1, page 4, 5ft [1+:+pyrenic acid-1 is corrected to "propimenic acid".

Claims (1)

[Claims] Oxygen, with highly active metals or metal oxides) 1. Measure the oxidation gradient in a gas or ml, characterized in that t4j+ is a negative t4j+, and a mixed aqueous liquid of propylenoic acid, an organic acid salt of an alkali metal or ammonia, and a powder compound is 1□lf Ill ili. I'll be the first to know! , /1. L
J type 1 arsenic concentration meter,