JPH03108640A - Apparatus for measuring concentration of sludge in liquid - Google Patents
Apparatus for measuring concentration of sludge in liquidInfo
- Publication number
- JPH03108640A JPH03108640A JP24507889A JP24507889A JPH03108640A JP H03108640 A JPH03108640 A JP H03108640A JP 24507889 A JP24507889 A JP 24507889A JP 24507889 A JP24507889 A JP 24507889A JP H03108640 A JPH03108640 A JP H03108640A
- Authority
- JP
- Japan
- Prior art keywords
- output
- light
- sludge
- photoelectric element
- sludge concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 37
- 239000007788 liquid Substances 0.000 title claims description 7
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 239000011521 glass Substances 0.000 claims abstract description 12
- 230000004044 response Effects 0.000 claims description 2
- 239000000295 fuel oil Substances 0.000 abstract description 20
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052721 tungsten Inorganic materials 0.000 abstract description 3
- 239000010937 tungsten Substances 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000006903 response to temperature Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は液中のスラッジ濃度の測定装置に関し、さらに
詳しくは重油等のディーゼル機関用燃料油あるいはディ
ーゼル機関用潤滑油中のスラッジ濃度の測定装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for measuring the concentration of sludge in liquid, and more particularly to a device for measuring the concentration of sludge in fuel oil for diesel engines such as heavy oil or lubricating oil for diesel engines.
船舶用の燃料油、特にディーゼル機関用の重油、軽油等
の燃料油の品質は年々劣悪化の傾向にあり、従ってその
固形分く以下スラッジという）含有量も漸増傾向にある
。ディーゼル機関は内燃機関であるため、その燃料油中
のスラッジは充分に除去する必要があるが、その除去に
は、−・般に分離板式遠心分離機が使用され捕捉したス
ラッジは弁シリンダを開放することにより排出している
。The quality of fuel oil for ships, especially fuel oil such as heavy oil and light oil for diesel engines, tends to deteriorate year by year, and the solid content (hereinafter referred to as sludge) also tends to gradually increase. Since a diesel engine is an internal combustion engine, it is necessary to sufficiently remove sludge from its fuel oil. Generally, a separator plate centrifuge is used to remove the sludge, and the captured sludge is removed by opening the valve cylinder. It is discharged by doing so.
そしてその排出方法は原油種類、バンカー地等にもとづ
く経験により遠心分離機の弁シリンダの開放間隔をタイ
マーにより適宜設定して運転しているが、最近の様にス
ラッジの含有量が高くなっているとその設定時間に見込
み違いがあった場合には回転体内にスラッジを許容量以
上にため過ぎ、その結果として高速回転時のアンバラン
スによる異常振動発生等不測の事故を惹起する原因にも
なっている。そこで本出願人は先に特願昭６３−６９７
２６号にて遠心分離機に供給する原液中のスラッジ濃度
及び処理液中のスラッジ濃度をそれぞれ測定して弁シリ
ンダの開放間隔を自動的に調節する運転制御方法を提案
した。本発明は該方法に関して重油中等のスラッジ濃度
を測定する装置を提供するものである。The discharge method is based on experience based on the type of crude oil, bunker location, etc., and the opening interval of the centrifuge's valve cylinder is set appropriately using a timer.However, recently, the content of sludge has been increasing. If there is a miscalculation in the set time, sludge will accumulate in the rotating body beyond the allowable amount, and as a result, it may cause unexpected accidents such as abnormal vibrations due to imbalance during high-speed rotation. There is. Therefore, the present applicant first applied for patent application No. 63-697.
In No. 26, we proposed an operation control method that measures the sludge concentration in the stock solution and the sludge concentration in the treated solution supplied to a centrifuge, and automatically adjusts the opening interval of the valve cylinder. The present invention provides an apparatus for measuring the concentration of sludge in heavy oil, etc. in connection with the method.
液中の固形分、夾雑分を測定する装置としては光を利用
するもの、超音波を利用するもの、放射線を利用するも
の等が種々提案され、主に下水汚泥の測定用等を中心と
してその技術が発展して来ている。本発明の対象物であ
る重油中のスラッジを測定する装置としては、例えば特
開昭５８−１７９３４２号に示される様な透過光測定法
である。当該測定法の概要は流体測定槽のサイトガラス
より平行光線を入射し、対向するサイトガラスより出る
透過光を並置する測定用フィルタ及び基準用フィルタを
通してそれぞれ光電素子（シリコンフォトダイオード等
）に受光させ、その発生電圧を増幅して得られた増幅信
号をデバイダにて比率計算（光電素子出力／サーミスタ
回路出力）し、予め設定した比率計算値と対比すること
によりその濁度（スラッジ濃度）測定するものである。Various devices have been proposed for measuring solid content and impurities in liquids, including those that use light, ultrasound, and radiation. Technology is developing. An example of an apparatus for measuring sludge in heavy oil, which is the object of the present invention, is a transmitted light measuring method as disclosed in Japanese Patent Application Laid-open No. 179342/1983. The outline of this measurement method is that parallel light is incident through a sight glass in a fluid measurement tank, and the transmitted light emitted from an opposing sight glass is received by a photoelectric element (silicon photodiode, etc.) through a parallel measurement filter and a reference filter. The amplified signal obtained by amplifying the generated voltage is used to calculate the ratio (photoelectric element output/thermistor circuit output) using a divider, and the turbidity (sludge concentration) is measured by comparing it with a preset ratio calculation value. It is something.
以上の従来の透過光測定装置においては、測定光と標準
光を全く同じ条件にて光電素子に受光させるため、測定
時における流体の温度や気泡、ウィンド散乱光等の影響
を最少限に止める作用を有するとともに、光源の変化、
電圧変動等の影響を少なくし、正確な測定値を得ること
ができる効果を有するのであるが、反面フィルタや光電
素子及び増幅器等が、測定光用と標準光用と２系統の設
置が必要であるため設備構成が複雑であるとともに設備
費も嵩むという問題がある。本発明は以上の問題を解決
し、船舶用に適した簡華な構成で且つ維持管理も容易で
堅牢な重油中等のスラッジ濃度の測定装置を提供するこ
とを課題とするものである。In the conventional transmitted light measuring device described above, the measurement light and the standard light are received by the photoelectric element under exactly the same conditions, so the effects of fluid temperature, air bubbles, wind scattered light, etc. during measurement are minimized. In addition to having a change in the light source,
This has the effect of reducing the effects of voltage fluctuations and obtaining accurate measured values, but on the other hand, it requires the installation of two systems of filters, photoelectric elements, amplifiers, etc., one for the measurement light and one for the standard light. Therefore, there are problems in that the equipment configuration is complicated and equipment costs are also high. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a device for measuring the concentration of sludge such as heavy oil, which has a simple structure suitable for ships, is easy to maintain, and is robust.
前記課題を解決するための本発明の要旨とするところは
、測定槽の一方のサイトガラスより光を投射し、別の対
向するサイトガラスより出る透過光を検出して液中のス
ラッジの濃度を測定する装置において、 （イ）光源と
フィルタ並びにスリット及び集光レンズとからなり測定
槽に光を投射する光源発生部と、 （ロ）測定槽から出
る透過光に感応して出力する光電素子と該光電素子の雰
囲気温度に比例して出力するサーミスタを含む抵抗回路
とからなる受光部と、 （ハ） 前記光電素子から得ら
れる出力を増幅する増幅器と該増幅器の出力と前記抵抗
回路から得られる出力とを比率計算するディバイダとか
らなり得られた比率値を出力する変換部とからなること
を特徴とする液中のスラッジ濃度の測定装置である。す
なわち、発明者は本装置の使用目的から実用上支障ない
精度であればよいことに留意して鋭意検討の結果、従来
の透過光測定装置に具備されている原型光用の手段を削
除し、代りに受光部の光電素子の雰囲気温度に感応して
その温度に比例して出力するサーミスタを含む抵抗回路
を受光部に組み入れた装置を開発したものである。これ
は光電素子は入力する光以外にも、その雰囲気温度にも
比例して出力を増減しこれが測定誤差の大きい原因にな
っていることが検討の結果判明したためである。The gist of the present invention for solving the above problems is to project light from one sight glass of a measurement tank and detect the transmitted light emitted from another sight glass opposite to it to determine the concentration of sludge in the liquid. In the measuring device, (a) a light source generating section consisting of a light source, a filter, a slit, and a condensing lens and projecting light onto the measurement tank; (b) a photoelectric element that responds to and outputs the transmitted light emitted from the measurement tank; a light receiving section comprising a resistance circuit including a thermistor that outputs an output in proportion to the ambient temperature of the photoelectric element; (c) an amplifier for amplifying the output obtained from the photoelectric element; and an output of the amplifier and the output obtained from the resistance circuit. This is a measuring device for measuring the concentration of sludge in a liquid, comprising: a divider that calculates the ratio between the output and the output, and a converter that outputs the obtained ratio value. That is, as a result of careful consideration, the inventors removed the prototype light means provided in the conventional transmitted light measuring device, keeping in mind that the accuracy should be sufficient for practical purposes based on the purpose of use of the present device. Instead, we have developed a device in which a resistor circuit including a thermistor that is sensitive to the ambient temperature of a photoelectric element in the light receiving section and outputs an output in proportion to the temperature is incorporated into the light receiving section. This is because studies have revealed that photoelectric elements increase or decrease their output in proportion to not only the input light but also the ambient temperature, which is the cause of large measurement errors.
測定装置内部の温度は測定する油の温度、冷却空気量あ
るいは測定装置を設置する機関室内の温度等により影響
を受は変化する。この温度変化があった場合、発光ダイ
オード製の光源やあるいは前述のように受光部の光電素
子（シリコンフォトダイオード）は影響を受けてその出
力に変化が生じ、これがディバイダ出力のドリフトの原
因になっている。The temperature inside the measuring device is affected by the temperature of the oil to be measured, the amount of cooling air, the temperature inside the engine room where the measuring device is installed, etc. When this temperature change occurs, the light source made of a light emitting diode or, as mentioned above, the photoelectric element (silicon photodiode) in the light receiving section is affected and its output changes, which causes a drift in the divider output. ing.
そこで本発明においては、光源を雰囲気温度の影響を受
けにくい発熱温度の高いタングステンランプとし、また
受光部の光電素子の温度影響については、前述のように
光電素子近傍に第２図に示されるサーミスタとポテンシ
ョメータを含む抵抗回路を設け、ポテンショメータの調
整により、サーミスタが感応した温度に比例する基準出
力としてＥｏを次の式に従って発生せしめている。Therefore, in the present invention, the light source is a tungsten lamp with a high heat generation temperature that is not easily affected by the ambient temperature, and the temperature influence of the photoelectric element in the light receiving section is reduced by using a thermistor shown in FIG. 2 near the photoelectric element as described above. A resistive circuit including a potentiometer and a potentiometer is provided, and by adjusting the potentiometer, Eo is generated as a reference output proportional to the temperature sensed by the thermistor according to the following equation.
ＥＯ；基準出力（ｖ）、Ｖ；規定電圧（ｖ） 、 Ｉｌ
ｘ ；ポテンショメータ（Ω）、Ｔｈ；サーミスタ（Ω
）、Ｒ；固定抵抗（Ω）。EO: Reference output (v), V: Specified voltage (v), Il
x: Potentiometer (Ω), Th: Thermistor (Ω)
), R; fixed resistance (Ω).
以上によって得られた温度補正後のデイバイダの出力値
と重油中のスラッジ濃度（ＪＩＳ Ｋ２２７６法）の間
には一定の一次の相関関係があり、これをコンピュータ
等に記憶させておけばデイバイダの出力値をコンピュー
タに入力することによりスラッジ７８度を簡単に求める
ことかできる。There is a fixed linear correlation between the output value of the divider after temperature correction obtained above and the sludge concentration in heavy oil (JIS K2276 method), and if this is stored in a computer etc., the output of the divider can be adjusted. Sludge 78 degrees can be easily determined by inputting the value into a computer.
以下実施例を示す図面に基き本発明の内容をさらに説明
する。第１図は本発明に係る重油等のスラッジ濃度測定
装置の要部ｔＭ構成図あり、第２図はサーミスタを含む
抵抗回路図である。図において１は光源であり発熱温度
の高いタングステンランプが好適である。２はフィルタ
であり、重油中のスラッジ測定に好適な波長範囲と充電
素子の感応する波長範囲を考慮して測定に障害となる波
長域の光線をカットするフィルタである。１１はスリッ
ト、３は集光レンズであり これらは入光側のサイトガ
ラス４上に効率よく集光する作用をする。１０は内部を
測定される重油が適宜流速で流れる測定槽であり、光の
入口側と出口側に夫々ザイトガラス４，４′が液密的に
封着される。６は出口側のサイトガラス４゛を出る透過
光に感応して電気を出力する光電素子であり、重油中の
スラッジ濃度測定に好適な特定波長の光線に感応できる
光電素子の必要があり、例えばシリコンフオｌ・ダイオ
ードが最も好適である。５は受光部６の温度変化に対応
して出力するサーミスタを含む抵抗回路であり第２図に
示される回路が組込まれる。７は光電素子の出力の増幅
器であり、８はディバイダであり増幅器７から入力され
た出力値に基き比率計算（光電素子出力／サーミスタ回
路出力）を行い得られた結果を例えばカレントモジュー
ル等で電流値に交換後前記の様にマイクロコンピュータ
等に入力して重油中のスラッジ濃度を求めることができ
る。本スラッジ濃度測定装置を遠心分駈機に入る流路及
び出る流路中に設置して遠心分離機に入る重油及び遠心
分離機を出る重油中のスラッジ濃度により捕捉されたス
ラッジ量を計算し、許容量に達すれば図示はされない遠
心分Ｈ機の制御器を介して弁シリンダを開放してスラッ
ジを排出する。The contents of the present invention will be further explained below based on the drawings showing examples. FIG. 1 is a block diagram of a main part tM of a heavy oil sludge concentration measuring device according to the present invention, and FIG. 2 is a resistance circuit diagram including a thermistor. In the figure, 1 is a light source, and a tungsten lamp with a high heat generation temperature is suitable. Reference numeral 2 denotes a filter that cuts light in a wavelength range that would be an obstacle to measurement, taking into consideration the wavelength range suitable for measuring sludge in heavy oil and the wavelength range sensitive to the charging element. Reference numeral 11 denotes a slit, and numeral 3 denotes a condensing lens, which function to efficiently condense light onto the sight glass 4 on the light entrance side. Reference numeral 10 denotes a measuring tank through which the heavy oil to be measured flows at an appropriate flow rate, and zyte glasses 4 and 4' are sealed liquid-tightly on the light inlet and outlet sides, respectively. Reference numeral 6 denotes a photoelectric element that outputs electricity in response to transmitted light exiting the sight glass 4 on the exit side.There is a need for a photoelectric element that can be sensitive to light of a specific wavelength suitable for measuring sludge concentration in heavy oil. Silicon film diodes are most preferred. Reference numeral 5 denotes a resistance circuit including a thermistor that outputs an output in response to temperature changes in the light receiving section 6, into which the circuit shown in FIG. 2 is incorporated. 7 is an amplifier for the output of the photoelectric element, and 8 is a divider, which calculates the ratio (photoelectric element output/thermistor circuit output) based on the output value input from the amplifier 7, and converts the obtained result into a current using a current module, etc. After exchanging the value, the sludge concentration in heavy oil can be determined by inputting it into a microcomputer or the like as described above. This sludge concentration measuring device is installed in the flow path entering and exiting the centrifugal separator, and the amount of sludge captured is calculated based on the sludge concentration in the heavy oil entering the centrifuge and the heavy oil exiting the centrifuge, When the allowable amount is reached, the valve cylinder is opened via the controller of the centrifugal H machine (not shown) to discharge the sludge.
以上説明した構成と作用を有する本発明によれば、簡単
な構造で且つ経済的な装置で重油中のスラッジ濃度を連
続的に測定できるので、遠心分離機を安全に運転できる
とともに、適正なスラッジ排出間隔を自動的に設定でき
るためスラッジ排出に際しての油の損失あるいはスラッ
ジ処理量の減少等の経済的な効果か得られる。According to the present invention having the configuration and operation described above, it is possible to continuously measure the sludge concentration in heavy oil with a simple and economical device, so that the centrifuge can be operated safely and the sludge concentration can be appropriately measured. Since the discharge interval can be automatically set, economical effects such as a reduction in oil loss during sludge discharge or a reduction in the amount of sludge processed can be obtained.
第１図は本発明に係る重油中等のスラ・ンジ濃度測定装
置の要部構成図、第２図はサーミスタを含む抵抗回路で
ある。
１：光源、２；フィルタ、３；集光レンズ、４゜４′；
サイトガラス、５；サーミスタ、６；光電素子、７；増
幅器、８：ディバイダ、９；マイクロコンピュータ、１
０；測定槽、１１；スリット。FIG. 1 is a block diagram of the main parts of a sludge concentration measuring device for heavy oil, etc. according to the present invention, and FIG. 2 is a resistance circuit including a thermistor. 1: Light source, 2: Filter, 3: Condenser lens, 4°4';
Sight glass, 5; Thermistor, 6; Photoelectric element, 7; Amplifier, 8: Divider, 9; Microcomputer, 1
0: Measuring tank, 11: Slit.
Claims (1)
向するサイトガラスより出る透過光を検出して液中のス
ラッジ濃度を測定する装置において、（イ）光源とフィ
ルタ並びにスリット及び集光レンズとからなり測定槽に
光を投射する光源発生部と、（ロ）測定槽から出る透過
光に感応して出力する光電素子と該光電素子の雰囲気温
度に比例して出力するサーミスタを含む抵抗回路とから
なる受光部と、（ハ）前記光電素子から得られる出力を
増幅する増幅器と該増幅器の出力と前記抵抗回路から得
られる出力とを比率計算するディバイダとからなり得ら
れた比率値を出力する変換部とからなることを特徴とす
る液中のスラッジ濃度の測定装置。In a device that measures the sludge concentration in a liquid by projecting light from one sight glass of a measurement tank and detecting the transmitted light emitted from another sight glass facing the measuring tank, (a) a light source, a filter, a slit, and a condensing lens. (b) a resistor circuit including a photoelectric element that outputs an output in response to the transmitted light emitted from the measurement tank, and a thermistor that outputs an output in proportion to the ambient temperature of the photoelectric element; and (c) an amplifier that amplifies the output obtained from the photoelectric element and a divider that calculates the ratio between the output of the amplifier and the output obtained from the resistor circuit, and outputs the obtained ratio value. 1. A measuring device for measuring sludge concentration in a liquid, comprising a converting section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24507889A JPH03108640A (en) | 1989-09-22 | 1989-09-22 | Apparatus for measuring concentration of sludge in liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24507889A JPH03108640A (en) | 1989-09-22 | 1989-09-22 | Apparatus for measuring concentration of sludge in liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03108640A true JPH03108640A (en) | 1991-05-08 |
Family
ID=17128270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24507889A Pending JPH03108640A (en) | 1989-09-22 | 1989-09-22 | Apparatus for measuring concentration of sludge in liquid |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03108640A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008060087A1 (en) * | 2006-11-14 | 2008-05-22 | Environmental Management Corporation | Apparatus for sensing precipitation density of sludge in waste water treatment tank and method therefor |
| JP2011185913A (en) * | 2010-03-11 | 2011-09-22 | Takata Corp | Method for determining oil deterioration |
| JP2016109492A (en) * | 2014-12-03 | 2016-06-20 | 三菱化学株式会社 | Measuring method of solvent-insoluble content in heavy oil |
-
1989
- 1989-09-22 JP JP24507889A patent/JPH03108640A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008060087A1 (en) * | 2006-11-14 | 2008-05-22 | Environmental Management Corporation | Apparatus for sensing precipitation density of sludge in waste water treatment tank and method therefor |
| US8379211B2 (en) | 2006-11-14 | 2013-02-19 | Environmental Management Corporation | Apparatus for sensing precipitation density of sludge in waste water treatment tank and method therefor |
| JP2011185913A (en) * | 2010-03-11 | 2011-09-22 | Takata Corp | Method for determining oil deterioration |
| JP2016109492A (en) * | 2014-12-03 | 2016-06-20 | 三菱化学株式会社 | Measuring method of solvent-insoluble content in heavy oil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8834720B2 (en) | Apparatus for the extracorporeal treatment of blood | |
| US7777868B2 (en) | System for measuring non-volatile residue in ultra pure water | |
| US4713964A (en) | Device for optical turbidity measuring of gases | |
| GB8927371D0 (en) | Flow monitor | |
| US5777748A (en) | Device for determining density and concentration of visible constituents in fluids | |
| US9651486B2 (en) | Method and device for measuring the gas content in a liquid, and use of such a device | |
| CA1183019A (en) | Oil detector | |
| JPH03108640A (en) | Apparatus for measuring concentration of sludge in liquid | |
| KR20170136885A (en) | Small fine dust photo sensor | |
| KR890004585Y1 (en) | Steam boiler apparatus | |
| US3480784A (en) | Absorption tester having ports and trapezoidal enclosure with provision for eliminating bubbles from the optical test path | |
| NO148689B (en) | DETECTOR DEVICE FOR AA DETECTED PRESENCE OF A NON-MIXABLE ALIEN FLUID ON THE SURFACE OF ANOTHER LIQUID | |
| JPH05209828A (en) | Smoke detector | |
| US4289018A (en) | Method and apparatus for measuring degasification | |
| JPH09101260A (en) | In-line type instrument for measuring impurity concentration of solution | |
| JPH11230905A (en) | Turbidimeter | |
| JPH0833196B2 (en) | Burner combustion controller | |
| US20210055003A1 (en) | Pump system | |
| SU1760333A1 (en) | Method of determining gas and flow rate | |
| JPH06241975A (en) | Grain size distribution measuring device | |
| KR970044530A (en) | Fault determination device of cooling water temperature sensor | |
| JPS63274843A (en) | Temperature control method for differential refractometer | |
| BE896245A (en) | DEVICE FOR CONTINUOUS MEASUREMENT AND / OR MONITORING OF THE CONTAMINATION OF WATER | |
| SU890202A1 (en) | Dew point hygrometer | |
| RU2077709C1 (en) | Device for on-line check of tolerance of diameters of input apertures of photographic lens |