中文介绍
美国IST IQ-250便携式单气体检测仪是一款高性能、高可靠性的气体检测设备，适用于多种工业和环境监测场景。该设备能够检测150多种有毒或可燃气体中的任何一种，广泛应用于化工、石油、天然气、环保等领域。
IQ-250采用固态或电化学传感器，传感器寿命长达10年以上，确保长期稳定运行。其外置探头采用扩散式采样方式，探头软线长度约0.6米，能够灵活适应不同检测环境。设备配备3位LED数字显示屏，可清晰显示气体浓度，同时具备声光报警功能，低/高两个报警点可根据用户需求进行设定。
该设备工作电源为4节AA型碱性电池或AC适配器/充电器，用户还可选配镍镉充电电池。碱性电池可支持14小时的连续工作，镍镉电池则可支持8小时。其外壳采用坚固的铝质材料，尺寸为158.7×76.2×55.6毫米，重量仅630克（含电池），便于携带和操作。
IQ-250的便携包可清洗，易于清除污染，确保设备在复杂环境下的清洁和维护。其工作温度范围为-20℃至+50℃，存储温度为-20℃至+60℃，相对湿度范围为0-99% RH（非连续凝露），适应性强。
标准配置包括主机、碱性电池、110VAC适配器/充电器、使用手册、校准证书和便携包，用户还可选配镍镉充电电池和110/220VAC转换器。

English Introduction
The American IST IQ-250 portable single-gas detector is a high-performance and reliable gas detection device suitable for a variety of industrial and environmental monitoring scenarios. This device can detect any of over 150 types of toxic or combustible gases and is widely used in industries such as chemical, petroleum, natural gas, and environmental protection.
The IQ-250 features a solid-state or electrochemical sensor with a lifespan of over 10 years, ensuring long-term stable operation. It is equipped with an external probe that uses a diffusion sampling method. The probe’s flexible cable is approximately 0.6 meters long, allowing for versatile detection in different environments. The device also has a 3-digit LED digital display that clearly shows gas concentration levels and includes both visual and audible alarm functions. The low and high alarm points can be adjusted according to user requirements.
The device operates on four AA alkaline batteries or an AC adapter/charger, with optional nickel-cadmium rechargeable batteries. Alkaline batteries can support up to 14 hours of continuous operation, while nickel-cadmium batteries can support 8 hours. The device’s aluminum casing measures 158.7×76.2×55.6 mm and weighs only 630 grams (including batteries), making it easy to carry and use.
The portable case of the IQ-250 is washable, facilitating easy cleaning and maintenance in complex environments. The device operates within a temperature range of -20°C to +50°C and can be stored between -20°C and +60°C. It also functions in relative humidity levels ranging from 0-99% RH (non-condensing), demonstrating strong adaptability.
Standard configurations include the main unit, alkaline batteries, a 110VAC adapter/charger, user manual, calibration certificate, and a portable case. Optional accessories include nickel-cadmium rechargeable batteries and a 110/220VAC converter.