Overview
The air thermometer is a classic instrument that measures temperature by observing the expansion or contraction of air trapped in a sealed container. Unlike liquid-filled thermometers, it uses air as the thermometric medium, making it less prone to contamination and suitable for a wide range of temperatures. Invented in the early 17th century, air thermometers were among the first devices to quantify temperature. They remain relevant today due to their simplicity and reliability, especially in environments where electronic sensors might fail.
Structure and Working Principle
A typical air thermometer consists of a glass or metal bulb connected to a narrow tube, often filled with a colored liquid for visibility. As temperature changes, the air inside the bulb expands or contracts, causing the liquid column to rise or fall. The working principle is based on the ideal gas law (PV = nRT), where temperature changes directly affect air volume at constant pressure. This makes air thermometers highly responsive, though calibration is necessary for precise measurements.
Key Features
Air thermometers are valued for their durability and minimal maintenance requirements. Since they contain no hazardous liquids, they are safer than mercury thermometers and environmentally friendly. Another advantage is their wide operational range, from below freezing to several hundred degrees Celsius, depending on construction materials. Their mechanical nature ensures functionality even in power outages or electromagnetic interference-prone areas.
Application Areas
In industrial settings, air thermometers monitor processes in chemical plants, food production, and HVAC systems. Laboratories use them for experiments requiring non-invasive temperature measurements. They are also common in meteorology for atmospheric studies and in educational settings to demonstrate thermodynamic principles. Their robustness makes them ideal for harsh environments like construction sites or agricultural fields.
Maintenance and Precautions
Regular calibration against a known standard ensures accuracy. Avoid exposing the thermometer to sudden pressure changes, which can damage the sealed system or skew readings. For glass models, handle with care to prevent breakage. In dusty environments, periodic cleaning of the tube prevents obscuration of the liquid column. Store in a stable environment when not in use to prolong lifespan.
B2B Procurement Guide
When sourcing air thermometers wholesale, prioritize suppliers with ISO certification for quality assurance. Bulk orders typically offer 10-30% discounts, with prices varying by material (e.g., borosilicate glass models command a premium). Key specifications to verify include measurement range (commonly -20°C to 150°C for standard models), accuracy (±1°C is typical), and ingress protection (IP) rating for outdoor use. Lead times average 2-4 weeks for custom calibrations.
Related Manufacturers
- 主营：分析仪、采样器、检测仪、温度计、监测仪、照明灯、氟化物、高压气源、气体检测、在线监测、细菌培养、微控制器、监测设备、固定污染源、液液萃取仪、生物安全柜、大气污染物、明渠流量计、红外测油仪、测定重量法、气体报警器、气体探测器、大气采样仪、恒温恒湿系统、双重粉尘过滤、大流量采样泵
- 主营：矿用挖掘机、矿用清仓机、矿用扒渣机、空气炮、给煤机、无压风门、防水密闭门、气动隔膜泵、滚轮罐耳、皮带综保、矿用锂离子蓄电池电源、矿用翻车机、小型挖掘机、洒水降尘装置、司控道岔装置、气动阻车器、气动卧闸、断带抓捕器、矿用防爆摄像仪、跑车防护装置、压风供水自救装置、防水剂、履带运输车、巷道修复机、矿用挖掘式装载机
- 主营：矿山机械、铁路设备、救援设备、通风干湿温度计、防爆电器、路面机械、工程机械
- 主营：油气回收检测仪、便携式活性炭碘值检测、烟花爆竹探测器、温度计、便携式明渠流量计、单人防护装备、个人剂量报警仪、氢火焰离子化检器、水质快检试剂包、手持热电风速仪、水样采样设备、便携式噪声检测仪、多参数气体检测仪、热成像泄漏检测仪、土壤重金属检测仪、移动源执法监测设备、水质指纹预警溯源仪、便携式烟气分析仪、便携式恶臭检测仪、便携式油烟检测仪、林格曼黑度检测仪、消耗臭氧层物质检测仪、应急防护包、辐射防护包、个人防护包、油气回收多参数检测仪
- 主营：空气温度测量仪、热像仪、热成像仪、红外热像
- 主营：内视仪、声级计、量房仪、温度计、钳形表、测距仪、照度计、测量仪、热像仪、检测仪、万能表、风速仪、测温计、电焊机、测电笔、记录仪、电流表、分贝仪、测温枪、测温仪、万用表、噪音计、电工表、相序仪、分贝计
- 主营：水浴箱、分析仪、监测仪、空气温度湿球检测仪、报警仪、臭氧计、触摸屏、控制器、黑度仪、电子秤、测温仪、测定仪、传感器、物安全、计数器、流量计、采样器、消解器、照度仪、干燥筒、机器人、测试仪、离心机、光离子、防护包、浊度仪
- 主营：动压管、风压管、全压管、测量空气温度相对湿度、风速仪、风速管、皮托管、高速风表、管道测风、机械通风、标准防堵、智能热球、矿用电子、风速风压仪、风速风向仪、风速报警仪、风压风量仪、传感去电压、扬尘监测仪、压力风量仪、风向传感器、风向风速计、离子检测仪、矿用高速风、风速测量仪、电动喷雾器
- 主营：单人防护装备、生态环境执法装备、移动执法包、空气微生物采样器、恒流空气采样器、移动源执法设备、不透光烟度计、氮氧化物分析仪、obd诊断仪、烟尘烟气测试仪、超声波明渠流量计、多普勒流速仪、水质多参数检测仪、cod检测仪、热电风速仪、不分光红外气体检测仪、照度计、大气环境采样器、粉尘仪、油烟检测仪、氢火焰离子检测仪、水质自动采样器、林格曼黑度计
- 主营：空气温度和皮肤温度、明渠流量计、在线水质采样器
- 主营：搬运气垫、高压软管、卷扬机、干湿球温度计、螺旋千斤顶、高压清洗机、雾化消毒门、栏木机、洗靴机、速凝剂、密闭气囊、射流器、叉车吊臂、矿用门、变压器、破拆工具、手拉葫芦、翻车机、链轮组件、推车机、搬运坦克、酸碱喷射器、蒸汽喷射器、气固喷射器、张拉机具、临时支护
- 主营：干燥箱、白度仪、试压泵、温度计、带锯机、木工机床、压刨机、投料机、爬楼机、数控定位架、灌装机、钉角机、扬尘监测仪、铆钉机、内窥镜、剥线机、除锈机、测亩仪、插桶泵、加油机、二氧化碳测定仪、尘埃粒子计数器、脱油机、中药粉碎机、增氧机
- 主营：单人防护装备、移动执法包、个人防护箱、温度计、移动执法箱、车用尿素检定仪、移动源执法监测设备、手持式林格曼黑度仪、氮氧化物检测仪、便携式不透光烟度计、机动车尾气检测设备、个人防护包、应急防护包、辐射防护包、在用车尾气检测仪、工业内窥镜、通用车载诊断仪OBD、手持式光离子化检测仪、多参数气体检测仪、FID氢火焰检测仪、PID光离子检测仪、个人剂量报警仪、手持多参数水质检测仪、水质快检试剂包、手持热电风速仪、测距仪
- 主营：砂光机、除锈机、增氧机、温度计、爬楼机、粗糙度仪、加油机、带锯机、压刨机、拉花锯、防窃听检测仪、测亩仪、选果机、漏水检测仪、水份检测仪、铆钉机、管道疏通你、电动脚手架
- 主营：培养箱、分析仪、检测仪、温度计、报警仪、测量仪、酸度计、风速仪、蓝牙、称重系统、室内检测仪器、甲醛检测、测定仪、声校准器、酸碱浓度计、流量计、采样器、消解器、机器人、振动检测分析仪、测试仪、环保第三方检测、环境检测、防护包、生物安全柜、浊度仪