High temperature limits of test chambers
There are many types of test chambers, but they all high and low temperature limits. Let's take a look at the typical high temperatures thresholds and why they exist.
Test chambers usually have wire heaters made of a material called Nichrome. By placing successive loops of heater wire, a greater amount of heat that is generated. The result looks a lot like the inside of a toaster. Fans circulate the air past the heaters, so the samples in the chamber are not exposed to radiant heat. It is very easy to add heaters and increase the speed and/or high limit of a chamber.
Hongzhan chambers typically have a high temperature limits under 200°C. Here is a break-down of why a chamber's high temperature limit exists:
Limit to 85°C: Our panelized walk-in chambers cannot go higher than 85. These units use expanded urethane for insulation. Urethane can start to degrade at temperatures above 85°C. For walk-in customers who need higher temperatures, we switch to a fiberglass insulation. The benchtop customer can switch to another model. Since fiberglass insulation isn't rigid, we have to include an angle-iron frame, so we call these models one-piece or solid-construction.
150°C: There are two reasons we may limit a chamber to 150°C. First, there may be a limitation of the materials used inside the chamber. Secondly, for extremely fast chambers, we may limit the high temperature to avoid problems with accidentally tripping overheat protection devices.
170-180°C: Most models stop at this temperature range. There is a risk of burning the oil inside the refrigeration's cooling coil.
210°C: Because thermal shock chambers separate the hot and cold sides, we don't have to worry about the refrigeration oil. However, temperatures around 200°C are approaching the limit of several materials used in constructing the chamber.
300°C: Significant changes to the construction and materials of the chamber can allow an even higher temperature. In this case, the refrigeration coil is isolated from the chamber by dampers, so that it is only exposed when required. This would be strictly a custom-built chamber.
試驗(yàn)室的高溫極限
有許多類型的測(cè)試室，但它們都高和低溫極限。讓我們來(lái)看看典型的高溫閾值和它們存在的原因.。
試驗(yàn)室通常有絲加熱器鎳鉻合金材料制成的。通過(guò)放置加熱器導(dǎo)線的連續(xù)循環(huán)，產(chǎn)生更多的熱量.。結(jié)果看起來(lái)很像烤面包機(jī)里。風(fēng)扇通過(guò)加熱器循環(huán)空氣，所以室內(nèi)的樣品不暴露在輻射熱中.。這是很容易添加加熱器和增加的速度和/或一個(gè)腔室的高限制。
宏展試驗(yàn)箱通常具有高的溫度限制在200°C.打破為什么室的高溫極限存在：
限制到85°C：我們的模板間室不能高于85。這些單位使用膨脹聚氨酯絕緣。氨基甲酸酯可以降低85°C.對(duì)預(yù)約的客戶誰(shuí)需要更高的溫度以上的溫度，我們切換到一個(gè)玻璃纖維絕緣。臺(tái)式用戶可以切換到另一個(gè)模型。由于玻璃纖維絕緣不是剛性的，我們必須包括角鋼框架，所以我們稱這些模型的單件或固體結(jié)構(gòu)。
150°C：有兩個(gè)原因，我們可能會(huì)限制一個(gè)腔室到150°C.首先，可能有一個(gè)限制的材料在室內(nèi)使用。其次，對(duì)于非?？斓那皇?，我們可能會(huì)限制高溫，以避免意外跳閘過(guò)熱保護(hù)裝置的問(wèn)題。
170-180°C：大多數(shù)模型停在這個(gè)溫度范圍。制冷冷卻盤管內(nèi)有油燃燒的危險(xiǎn)。
210°C：由于熱休克室分離冷熱雙方，我們不必?fù)?dān)心冷凍油。然而，約200°C的溫度接近的限制，用于建造室的幾種材料。
300°C：顯著變化的結(jié)構(gòu)和材料的腔室可以允許更高的溫度。在這種情況下，制冷線圈是由阻尼器隔離的腔室，所以它只在需要時(shí)暴露。這會(huì)是完全定制室。
