1. Giriş
The Mastfuyi FY867 is a multifunctional, battery-powered instrument designed for precise environmental monitoring. It features a user-friendly interface, convenient button operation, and an intuitive 2.4-inch full-color HD display. This device accurately measures four critical environmental parameters:
- Ortam Sıcaklığı: Mevcut hava sıcaklığı.
- Relative Humidity (%RH): The amount of moisture in the air relative to the maximum it can hold.
- Dew Point Temperature (DP): The temperature at which air becomes saturated with water vapor, leading to condensation. Crucial for preventing mold, rust, and damage in HVAC and storage.
- Wet Bulb Temperature (WB): The lowest temperature achievable by evaporating water into the air. Key for assessing heat stress and cooling system efficiency.
This instruction manual provides essential safety information, operating procedures, and technical specifications. Please read it carefully before using the product to ensure safe and effective operation.

2. Safety Operation Guidelines
Warning: Before using the product, please carefully read these safety guidelines.
- Before use, inspect the instrument and accessories for any damage or abnormality. Do not use the instrument if the housing is visibly damaged or the display is not functioning.
- Always follow the operating instructions provided in this manual when performing tests.
- Do not attempt to open the instrument or alter its internal wiring, as this may cause damage and void the warranty.
- When the display shows the low battery symbol, replace the batteries with new ones of the same specification promptly. If the instrument will not be used for an extended period, remove the batteries to prevent leakage.
- Do not store or use the device in environments with high temperature, high humidity, flammable or explosive materials, or strong electromagnetic fields.
3. Bileşenler ve Ekran
The Mastfuyi FY867 is designed for ease of use with clearly labeled components and a comprehensive display.

3.1. Physical Structure
- Soruşturma: Located at the top, this houses the high-precision digital sensor for temperature and humidity measurements.
- LCD Ekran: A 2.4-inch full-color HD screen for clear data visualization.
- Fonksiyon Düğmeleri: Located below the display for controlling various features.
- Instrument Housing: Made with durable, anti-slip, and impact-resistant silicone for superior grip and long-lasting performance.

3.2. LCD Display Area Description
The display provides real-time readings and status indicators:
- Auto Shut-off Symbol: Indicates automatic power-off function is active.
- Maximum Value Test Indication (MAX): Shows the highest recorded value.
- Minimum Value Test Indication (MIN): Shows the lowest recorded value.
- Data Hold Indication (HOLD): Indicates that the current reading is frozen on the screen.
- Düşük Pil Göstergesi: Pillerin değiştirilmesi gerektiğinde uyarı verir.
- Temperature Measurement Unit: Displays °C or °F.
- Relative Humidity Measurement Unit: Displays %RH.
- Sıcaklık Görüntüleme Alanı: Shows ambient temperature.
- Humidity Display Area: Shows relative humidity.
- Dew Point Temperature Area (DP): Shows dew point temperature.
- Wet Bulb Temperature Area (WB): Shows wet bulb temperature.
- Dew Point/Wet Bulb Measurement Units: Displays °C or °F for DP/WB.
4. Kurulum
4.1. Paket İçeriği
Paketi açtıktan sonra, lütfen tüm eşyaların eksiksiz olduğundan emin olun:
- MASTFUYI FY867 Digital Temperature Humidity Meter
- Kullanım Kılavuzu (bu belge)
- Tornavida
- 3 x 1.5V AAA Batteries (not included, please purchase separately)
- Protective Carrying Case (optional, may vary by package)

4.2. Pil Kurulumu
The FY867 requires 3 x 1.5V AAA batteries.
- Cihazın arkasındaki pil bölmesini bulun.
- Pil bölmesi kapağını açmak için verilen tornavidayı kullanın.
- Insert three 1.5V AAA batteries, ensuring correct polarity (+/-) as indicated inside the compartment.
- Pil bölmesi kapağını yerine takın ve vidayla sabitleyin.
5. Kullanım Talimatları
The FY867 is designed for intuitive operation with its clearly marked buttons.
5.1. Güç Açma/Kapatma
- Basın Güç düğmesi (
) once to turn the device on. - Basın Güç düğmesi Cihazı tekrar kapatmak için.
5.2. Otomatik Güç Kapatma (APO)
- The instrument has a default automatic power-off time of 10 minutes to conserve battery.
- To disable the APO function: While the device is off, press and hold the TUTMAK düğmesine basın ve ardından Güç düğmesi. The screen will display the "COU" symbol, indicating that APO has been successfully canceled.

5.3. Unit Switching (DP/WB and °C/°F)
- DP/WB Unit Toggle: Basın DP/WB °C/°F button for less than 1 second to switch between Dew Point (DP) and Wet Bulb (WB) temperature displays.
- Temperature Unit Toggle (°C/°F): Basılı tutun DP/WB °C/°F button for 2 seconds or more to switch the temperature unit between Celsius (°C) and Fahrenheit (°F).

5.4. MAX/MIN Value Display
- Ölçüm sırasında, basın. MAKS/MIN düğmesi to cycle through the maximum value (MAX), minimum value (MIN), and current normal value.
- When MAX or MIN is selected, the screen will continuously display the highest or lowest reading recorded since the device was powered on or the MAX/MIN function was reset.
5.5. Data Hold and Flashlight
- Veri tutma: Basın HOLD düğmesi for less than 1 second to activate or deactivate the data hold function. When active, the current readings will be frozen on the display.
- El feneri: Basılı tutun HOLD düğmesi for 2 seconds or more to turn the built-in flashlight on or off. This feature is useful for working in low-light conditions.

6. Özellikler
Below are the detailed technical specifications for the Mastfuyi FY867 Digital Temperature Humidity Meter.

| Parametre | Şartname |
|---|---|
| Model Numarası | 867-XNUMX mali yılı |
| Güç Türü | AAA Battery (3 x 1.5V AAA) |
| Sensör Tipi | High-precision digital sensor |
| Update Speed | 400ms |
| Görüntü Türü | DIGITAL (2.4-inch Full-Color HD Display) |
| Bağıl Nem Aralığı | 0 ~ 99%RH |
| Bağıl Nem Doğruluğu | ±3.0%RH (20%~80%), ±4.0%RH (0%~20%, 80%~99%) |
| Bağıl Nem Çözünürlüğü | %0.1 |
| Ortam Sıcaklık Aralığı | -20 ~ 60°C (-4 ~ 140°F) |
| Ambient Temperature Accuracy | ±1°C (0-45°C) / ±1.5°C (-20~0°C, 45~60°C) ±2°F (32~113°F) / ±3°F (-4~32°F, 113-140°F) |
| Ambient Temperature Resolution | 0.1°C / 0.2°F |
| Çiy Noktası Sıcaklık Aralığı | -50 ~ 60°C (-58 ~ 140°F) |
| Dew Point Temperature Accuracy | ±1°C (0~45°C) / ±1.5°C (-50~0°C, 45~60°C) ±2°F (32~113°F) / ±3°F (-58~32°F, 113~140°F) |
| Dew Point Temperature Resolution | 0.1°C / 0.2°F |
| Yaş Termometre Sıcaklık Aralığı | -20 ~ 60°C (-4 ~ 140°F) |
| Wet Bulb Temperature Accuracy | ±1°C (0~45°C) / ±1.5°C (-20~0°C, 45~60°C) ±2°F (32~113°F) / ±3°F (-4~32°F, 113~140°F) |
| Wet Bulb Temperature Resolution | 0.1°C / 0.2°F |
| Maksimum Ölçüm Sıcaklığı | 50°C - 69°C |
| Boyutlar | 180 x 61 x 33 mm |
| Ağırlık | 0.255 kilo |
| Veri Kaydı | Evet |
| Akıllı Cihaz mı? | Evet |
| Sertifikalar | CE, FCC, RoHS |
| Kökeni | Çin anakarası |
7. Bakım ve Saklama
7.1. Genel Bakım
- Cihazı temiz tutun ve tozdan ve kirden arındırın. Temizlik için yumuşak, kuru bir bez kullanın.
- Avoid exposing the device to extreme temperatures, direct sunlight, or sudden changes in temperature/humidity.
- Cihazı suya veya başka sıvılara daldırmayın.
7.2. Environmental Limitations
- Yükseklik: 2000 metreye kadar
- Kirlilik Seviyesi: Seviye 2
- Çalışma Sıcaklığı ve Nem: -20~60°C (-4~140°F), 45%-80%RH
- Depolama Sıcaklığı ve Nem: -20~60°C (-4~140°F), 45%-80%RH
7.3. Pil Bakımı
- Pil seviyesi düşük göstergesi göründüğünde pilleri derhal değiştirin.
- If the instrument is not going to be used for an extended period (e.g., several months), remove the batteries to prevent potential leakage and damage to the device.
8. Sorun Giderme
This section addresses common issues you might encounter with your Mastfuyi FY867.
- Cihaz açılmıyor:
- Ensure batteries are correctly installed with the proper polarity.
- Check if the batteries are depleted and replace them if necessary. - Yanlış okumalar:
- Allow the meter to stabilize for a period (e.g., 10-15 minutes) after moving it to a new environment, especially if there are significant temperature or humidity differences.
- Sensör probunun temiz ve engelsiz olduğundan emin olun.
- Verify that the device is not exposed to direct heat sources, strong drafts, or direct sunlight during measurement. - Display is blank or shows error:
- Check battery levels and replace if low.
- If the housing is damaged, discontinue use and contact support. - Automatic power off is too frequent/infrequent:
- Tekrarview section 5.2 on how to enable or disable the Automatic Power Off function.
If you encounter persistent issues not covered here, please contact Mastfuyi customer support.
9. Kullanıcı İpuçları
- Stabilizasyon Süresi: For the most accurate readings, especially when moving the meter between environments with different temperatures or humidity levels, allow the device to stabilize for at least 10-15 minutes in the new location.
- Sensör Bakımı: Keep the sensor probe clean and free from dust, lint, or any obstructions that could affect air circulation and measurement accuracy.
- Optimum Yerleştirme: When monitoring an area, place the meter away from direct heat sources, air conditioning vents, or open windows to get a representative reading of the general environment.
10. Garanti ve Destek
Mastfuyi products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please contact the manufacturer directly.
Üretici: Huizhou Şehri Fu Yi Elektronik Teknolojisi A.Ş.
E-posta: mkfuyi@mastfuyi.com
Webalan: www.mastfuyi.com
Adres: 4F and 5F, No.5 Building, Yinghui Technology Park, No.6 Dongsheng North Road, Chenjiang Sub-district, Zhongkai Hi-tech Zone, Huizhou City, Guangdong Province, China.
PDF formatında detaylı bir kullanım kılavuzu da indirilebilir: Kullanım Kılavuzu (PDF)





