1. Purpose

LH1250Temperature, humidity and pressure detectorIt is a pocket sized measuring instrument used for measuring temperature, humidity, and pressure. This instrument is widely used in public places, environmental protection, labor hygiene, scientific research, agriculture, meteorology, and other fields, as well as for detecting and controlling temperature and humidity in various industrial productions such as food, medicine, machinery, electronics, petroleum, and chemical industries. It is used for real-time monitoring of temperature and humidity in heating, indoor environments, office spaces, laboratories, hotels, restaurants, factories, warehouses, refrigeration rooms, and other environments. This instrument is compact, easy to carry, and convenient for indoor and outdoor use.

2Introduction

LH1250Temperature, humidity and pressure detectorUsing Swiss brick CMOSens ® High precision temperature and humidity sensors for technology and Swiss INTERSEMAHigh precision pressure sensor, temperature and humidityThe sensor components and signal processing circuits are integrated together to output fully calibrated high-precision digital signals. Ensure that the product has extremely high reliability and excellent long-term stability. Therefore, this product has the advantages of excellent quality, rapid response, and strong anti-interference ability. moreoverIt has the advantages of small size, low power consumption, high sensitivity, light weight, simple operation, and digital direct reading.

The instrument adopts a dual-purpose power supply method of AC and DC, and the DC adopts800mA,7.4VLithium ion rechargeable batteries are directly supplied to instruments through dedicated chargers for communicationElectricity, therefore convenient and reliable.

3. Working principle

The temperature and humidity sensor includes a capacitive polymer humidity sensing element, a temperature measuring element made of bandgap material, and seamlessly connected to a 14 bit A/D converter and serial interface circuit on the same chip. Each sensor chip is calibrated in an extremely humid chamber, and the calibration coefficients are stored in OTP memory in program form for internal signal calibration. The two-wire serial interface and internal voltage adjustment make peripheral system integration fast and simple.Pressure isPiezoresistive pressure sensor and ADC interface chip.

4.technical parameter

⑴. Measurement range: Temperature:-20℃~60℃；

Humidity:0%~100%RH

Pressure:30~110KPa

⑵. branchDistinguishRate:Temperature 0.1 ℃, humidity 0.1 (% RH), pressure 0.1KPa

⑶. essenceIndeeddegree：Temperature ± 0.6℃，humidity± 4% RH, pressure ± 0.3KPa

⑷. display Show:4Field LCD display,Temperature, humidity, and pressure conversion display

⑸. Storage environment: recommended0℃—40℃ 65%RHfollowing

⑹. electric Source:①7.4VLithium ion rechargeable battery

② DedicatedACPower adapter (optional)

⑺. gauge Grid:197mm×67mm×26.6mm

⑻. heavy Quantity:0.20Kg