日韩精品久久一二区,国产成人精品三级高清久久91,激情欧美一区二区中文字幕,午夜搞b视频在线免费观看

PND176石油產(chǎn)品凝點(diǎn)測(cè)定儀

該石油產(chǎn)品傾點(diǎn)凝點(diǎn)測(cè)定器是引進(jìn)日本精良技術(shù)生產(chǎn)的，符合GB/T 510。該儀器采用壓縮機(jī)制冷原理，封閉式浴槽，配有傾斜支架及傾點(diǎn)套，并裝有智能數(shù)字顯示控制儀，使用方便、質(zhì)量可靠，該儀器采用模糊控制原理和PID自整定技術(shù)，控制性能穩(wěn)定可靠，是化驗(yàn)室*的試驗(yàn)儀器。 
該儀器制冷系統(tǒng)是由壓縮機(jī)、過(guò)濾器、毛細(xì)管節(jié)流器、蒸發(fā)器及各連接管路組成。制冷劑通過(guò)蒸發(fā)器吸熱膨脹，膨脹后的氣體由壓縮機(jī)壓入排氣管路形成高溫高壓氣體再進(jìn)入冷凝器冷卻成液體，然后經(jīng)毛細(xì)管節(jié)流降壓進(jìn)入蒸發(fā)器蒸發(fā)吸熱從而達(dá)到制冷目的。制冷劑蒸發(fā)后又被壓縮機(jī)壓入排氣管進(jìn)入冷凝器，這樣周而復(fù)始地工作實(shí)現(xiàn)循環(huán)制冷。溫度控制系統(tǒng)是由智能數(shù)顯控溫儀進(jìn)行PID調(diào)節(jié)實(shí)現(xiàn)定點(diǎn)控溫，控溫儀輸出的控制信號(hào)觸發(fā)固態(tài)繼電器，使加熱管工作抵消壓縮機(jī)制冷系統(tǒng)產(chǎn)生的冷量，使其恒在我們所需要的溫度上。

PND176石油產(chǎn)品凝點(diǎn)測(cè)定儀

技術(shù)指標(biāo) ：
制冷溫度 ：室溫～－75℃  
降溫時(shí)間 ：≤100分鐘  
輸入方式 ：Pt100  
控溫精度 ：±0.1℃  
電源電壓 ：AC220V 50Hz 
結(jié)構(gòu)形式 ：一槽兩孔

PND176石油產(chǎn)品凝點(diǎn)測(cè)定儀

PND176 petroleum products pour point analyzer
The determination of the pour point of the pour point of the petroleum products is produced by the introduction of advanced technology from Japan, according to GB / T 510. The instrument uses a compressor refrigeration principle, enclosed bath with tilt stand and pour point sets, and is equipped with inligent digital display controller, easy to use, reliable quality, the instrument uses fuzzy control principle and PID self-tuning technology, control performance stable and reliable, is the the laboratory preferred test instrument.
The refrigeration system is the instrument by the compressor, filter, capillary restrictor, connected to the evaporator and the piping components. Endotherm of the refrigerant through the evaporator expansion pressure by the compressor, the expansion of the gas after the formation of high temperature and high pressure gas into the exhaust pipe and then into the condenser cooling into liquid, and then by capillary throttling into the evaporator evaporation endothermic to achieve refrigeration purposes . Compressor pressure refrigerant evaporates then into the exhaust pipe into the condenser, so the cycle refrigeration cycle to work. The temperature control system is noticeable by the inligent digital temperature control device PID adjustment to achieve the fixed-point temperature control, temperature control device output control signal to trigger solid-state relays, heating pipe work offset compressor refrigeration system to produce cold it constant in on the required temperature.

Technical indicators:
Refrigeration temperature: room temperature ~ -75 ℃
Cooling time: ≤ 100 minutes
Input mode: Pt100
Temperature control accuracy: ± 0.1 ℃
Power supply voltage: AC220V 50Hz
Structural forms: a slot two holes