土壤養(yǎng)分測定儀,土壤溫濕度記錄儀,土壤緊實度儀
YN-2000A型土肥儀技術(shù)指標(biāo):
分辨率:0.001-9999
重復(fù)性誤差:≤0.5(重鉻酸鉀溶液)
儀器穩(wěn)定性:≤0.5(透光度測量)
功率:≤5W
線形誤差:≤3%(硫酸銅檢測)
測試速度:測個土樣(N、P、K)≤1小時
YN-2000A型土肥儀產(chǎn)品特點:
功能:可測土壤、肥料、植株中的氮、磷、鉀;土壤(肥料)有機質(zhì);土壤水分(用燃燒法)、中微量元素(硼、錳、鐵、銅、鈣、鎂、硫、氯、硅、鋅、等)、氮;煙草中的還原塘、總糖等。(各類藥劑均可選購)
配套齊:該儀器集藥、器、儀為體,攜帶方便,相當(dāng)于個小型實驗室。適于農(nóng)業(yè)服務(wù)部門測土施肥和鑒別真假化肥。
操作簡便、速度快捷,獨研制的聯(lián)合浸提劑(發(fā)明專利)5分鐘即可完成氮、磷、鉀的浸提,成品藥劑開瓶即用,無須配置。
性能:工作穩(wěn)定性優(yōu)于國標(biāo)準(zhǔn)JJG179-90指標(biāo)的6倍,重復(fù)性達(dá)到光柵型分光光度計指標(biāo)水平。
上海旦鼎國際貿(mào)易有限公司(www.dookings.com)位于中國上海浦東新區(qū),專業(yè)從事MRO工業(yè)品的生產(chǎn)、和直銷。上海旦鼎擁有國內(nèi)外眾多知名工業(yè)領(lǐng)域產(chǎn)品的中國區(qū)權(quán)限和支國際采購團隊,為國內(nèi)企業(yè)客戶提供高性能的國產(chǎn)及進口工業(yè)和實驗儀器設(shè)備。上海旦鼎國際貿(mào)易有限公司實力雄厚,重信用、守合同、產(chǎn)品質(zhì)量,以多品種經(jīng)營特色和薄利多銷的原則,贏得了廣大客戶的信任。
更多信息可以參考http://www.89-china.com/
ExxonMobil Marine, United States
Mobil Stern Tube Lubricant is a high performance, high viscosity lubricant developed especially for the lubrication of Cedervall-type stern tube bearings used in ships and for certain bearings of ships' fin stabilizers. Mobil Stern Tube Lubricant is formulated from relatively high Viscosity Index (VI) base oils combined with emulsifiers, structure modifiers, surface active agents and corrosion preventives. It emulsifies readily with seawater to form a stable water-in-oil emulsion that is adhesive and an excellent lubricant. It provides effective rust protection in the presence of seawater and the lubricating film is resistant to water washing so that corrosion protection is maintained for extended periods under severe operating conditions.
Where the propeller shaft passes through the hull of a ship, it is supported by a bearing that is housed in the stern tube. Three distinct types of bearings are employed in this application: 1) The lignum vitae bearing, which has a stuffing box on the inboard side and no seal on the outboard side, is lubricated by seawater. The stuffing box may be lubricated with grease or oil, if this is deemed necessary. 2) Bronze or white metal bearings having oil-tight rubber seals on the inboard and outboard ends normally are filled with a lubricating oil that readily separates from water. Turbine oils, engine oils or hydraulic oils of the required viscosity generally are recommended. 3) The Cedervall type, which is a bronze or white metal bearing having an oil-tight inboard seal or stuffing box and metallic outboard seal that is not fully oil-tight, requires a lubricant that readily emulsifies with water. Mobil Stern Tube Lubricant has been formulated to meet this need. With the Cedervall type bearing a high viscosity lubricant generally is supplied to the bearing from a gravity tank located above the waterline so that the lubricant is under sufficient pressure to help exclude water from the bearing.
A recent development in ship stabilizers is the Denny-Brown-AEG stabilizer developed jointly by Brown Brothers and Co. Ltd, William Denny and Brothers Ltd., AEG, and Deutsche Weft. In these newer designs, the fins are mounted on trunnion bearings which permit them to be folded forward into storage boxes in the hull of the ship when not in use. A fixed shaft extends from the crux trunnion and the fin is mounted on this shaft on two bearings, which permit the fin to be tilted by a hydraulic mechanism to provide the righting movement to reduce roll of the ship. The interior of the fin and the fin bearings are lubricated by gravity from a header tank located above the waterline and the crux trunnion bearings are lubricated by pressure feed from a lubricator pump.
Features and BenefitsThe requirements for lubrication of these three sets of bearings in the stabilizers and stern tubes are sufficiently similar so that a single, carefully formulated lubricant can be used for all of them. To perform satisfactorily, however, the lubricant must have the correct viscosity to flow properly under gravity head without excessive rapid flow that would result in high consumption; must minimize wear under the heavy loads encountered in the bearings; must protect the bearings and other components from corrosion and must emulsify with any seawater that passes the seals in order to maintain lubricating characteristics and minimize corrosion.
In stern tube applications, consumption of the lubricant is a major concern, both from the standpoint of the cost of the lubricant and the cost of labor required to fill the tanks. In two ship trials conducted over an extended period, Mobil Stern tube Lubricant gave significantly reduced consumption compared to the previous formulation, and at least as low as the best competitive product. Throughout the tests, lubrication was entirely satisfactory. These results indicate that Mobil Stern Tube Lubricant provides effective and low cost lubrication of stern tube bearings.
Key features and potential benefits include:
Features | Advantages and Potential Benefits |
Selected viscometrics | Effective lubrication of critical stabilizer and stern tube components |
Good emulsification properties | Emulsifies readily to maintain lubrication in the presence of seawater |
Excellent rust and corrosion properties | Protects critical bearing surfaces exposed to seawater |
Multi-use capability | Reduces the number of lubricants required on-board |
Good viscosity retention in severe applications | Effective leakage control and reduced oil consumption |
Applications
Mobil Stern Tube Lubricant is recommended for the lubrication of Cedervall-type stern tube bearings on ships where a high viscosity, readily-emulsifying lubricant is recommended by the manufacturer. It is also recommended for the lubrication of fin tilting bearings, as well as the crux trunnion bearings of Denny-Brown-AEG ship stabilizers and is approved by the manufacturer for use in these applications.
Specifications and Approvals
Mobil Stern Tube Lubricant has the following builder approvals | |
Brown Brothers and Company, Ltd. | |
William Denny and Brothers Ltd. | |
AEG | |
Deutsche Weft |
Typical Properties
Viscosity | |
cSt @ 40ºC | 385 |
cSt @ 100ºC | 24 |
Viscosity Index, ASTM D 2270 | 82 |
Pour Point, ºC, max, ASTM D 97 | 10 |
Flash Point, ºC, min, ASTM D 92 | 246 |
Density @15ºC kg/l, ASMT D 4052 | 0.915 |
API Gravity | 23.1 |
Rust Test-Seawater, ASTM D 1401 | Pass |
Timken Salt Water Corrosion Test | Pass |
Emulsion Test, ASTM D 1401 | |
Emulsion @ 60 min, ml | 60 |
Emulsion characteristics | Thick and Stable |
Health and Safety
Based on available information, this product is not expected to produce adverse effects on health when used for the intended application, following the recommendations provided in the Material Safety Data Sheet (MSDS). MSDSs are available upon request through your sales contract office, or via the Internet on http://www.exxonmobil.com. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.
The ExxonMobil logotype, and Mobil are trademarks of ExxonMobil Corporation, or one of its subsidiaries.
POLYTRON ® PT 1200 E手持式均質(zhì)器(處理量:0.05-250ml)
瑞士KINEMATCA PT 1200E 該手持式的乳化均質(zhì)器適合于小量的樣品的處理,PT 1200E 符合人體工程學(xué)和輕量化的設(shè)計,易于操作人員的使用。如果需要的話,可以配上支架。PT 1200E 可以配上多種不同形式的工作頭,直徑從3mm 到12mm, 處理量從0.05ml到250ml。為了避免不同物料處理而引起的交叉污染,我們提供直徑7mm-12mm 的一次性合成材料分散頭。我們近期又在產(chǎn)品系列中添加了新的分散頭 PT-DA 20/2 X EC,專門用于均質(zhì)藥片。
PT 1200 E手持式均質(zhì)器的特點:
+ 24V, 100W 低壓電機馬達(dá),配有安全變壓器
+ 可控轉(zhuǎn)速,最大速度可以達(dá)到25,000rpm
+ 分散頭轉(zhuǎn)子的線速度可達(dá)到12m/s, 超細(xì)粒徑
+ 軟啟動以防止被均質(zhì)的物料從樣品容器中濺出
+ 符合人體工程學(xué)的設(shè)計,易于操作。
+ 專利的快接分散頭安裝設(shè)計, 可以單手完成安裝或者拆卸
+ 分散頭的定子-轉(zhuǎn)子易于拆卸清洗(Easy Clean 技術(shù)),操作者可以簡單快速完成定子-轉(zhuǎn)子的拆卸,提供不同的分散頭以滿足具體的需要。
手持式均質(zhì)器|手持式乳化機|實驗室均質(zhì)乳化機|實驗室乳化機|實驗室分散機|實驗室均質(zhì)器|高剪切均質(zhì)機|高剪切分散機
PT 1200 E手持式均質(zhì)器備件
包括:固定整個設(shè)備的支架
PT 1200 E 手持式均質(zhì)器技術(shù)參數(shù):
型號/系列 | 處理量 | 最大轉(zhuǎn)速 | 功率 | 分散頭直徑 | 標(biāo)準(zhǔn)軸長 |
PT 1200 E | 0.05-250ml | 28000rpm | 100w | 3-12mm | 50-123mm |
產(chǎn)品說明: 154N超穩(wěn)壓力傳感器:154N型壓力傳感器是一種經(jīng)過補償,且與介質(zhì)兼容的硅壓阻式傳感器,其外殼采用316不銹鋼封裝結(jié)構(gòu)。外界壓力通過316不銹鋼膜片及內(nèi)部灌充硅油傳遞傳感器件敏感元件上。 154N型壓力傳感器可應(yīng)用于低壓場合。通過對陶瓷基座上的厚膜電阻進行激光修阻,可以實現(xiàn)對傳感器的溫度補償及零點偏差調(diào)整。陶瓷基底上還提供了一個經(jīng)激光修正的增益調(diào)節(jié)電阻使傳感器在經(jīng)過外部差分電路放大后達(dá)到統(tǒng)一的輸出值,并可控制在+/-1%互換范圍內(nèi)。所屬品牌: MEAS輸出: 0~100mA 量程: 0-5,15,30,50,100,300,500(Psi) 封裝:小結(jié)構(gòu),o型圈密封工作溫度范圍:-40℃~125℃(補償溫度精確度:±0.1%非線性 供電電源: 1.5mA 特點: O形圈密封結(jié)構(gòu),激光修正補償技術(shù),外徑19mm 類型: 1.5mA 電氣連接:導(dǎo)線、焊盤、導(dǎo)線帶、導(dǎo)柱 典型應(yīng)用: 壓力變送器,生化儀器,過程控制,液位計 資料下載:http://www.sensorway.cn/sensors/22.html
國標(biāo)法蘭球閥PN 1.6MPa ~6.4MPa |
J10 美國奧立龍 KNIpHE pH 電極
9120APWP