Scope of Application

【Operating Instructions】

**YS751-III Series Constant Temperature and Humidity Test Chamber (Export Model)****【Scope of Application】**This constant temperature and humidity test chamber (also known as a high/lowtemperature test chamber or alternating high/low temperature test chamber) uses a&n

**YS751-III Series Constant Temperature and Humidity Test Chamber (Export Model)**  

**【Scope of Application】**  

This constant temperature and humidity test chamber (also known as a high/low 

temperature test chamber or alternating high/low temperature test chamber) uses a 

highly stable platinum PT‑100 temperature sensor, an LCD touch screen with Chinese/English

 display, multiple PID control functions, and an RS‑232C/485C interface for

 computer connection and control. It can simulate different environmental conditions such 

as high temperature/high humidity, high temperature/low humidity, low

 temperature/high humidity, high temperature, and low temperature. Equipped with an 

easy‑to‑operate and learn high‑accuracy programmable and set‑point control 

system, it provides excellent test performance. Widely used for virtual climate environment

 testing of products in industries such as electronics, electrical appliances, 

military, plastics, hardware, chemicals, etc., including electronic components, automotive 

parts, notebook computers, and more.

**【Technical Parameters】**  

1. **Temperature/Humidity Controller:** LED display  

2. **Resolution:** 0.1°C, 1%, PID control  

3. **Temperature range:** 20°C to 150°C  

4. **Humidity range:** 20% to 98% RH  

5. **Temperature/Humidity accuracy:** ±0.5°C, ±2.5% RH  

6. **Heating time:** –20°C to 100°C — approximately 35 minutes  

7. **Cooling time:** 20°C to –20°C — approximately 40 minutes  

8. **Inner chamber dimensions:** 40 × 50 × 40 cm  

9. **Outer dimensions:** 92 × 160 × 87 cm  

10. **Inner chamber material:** SUS#304 mirror‑finished stainless steel  

11. **Outer chamber material:** SUS#304 stainless steel  

12. **Insulation material:** Rigid polyurethane foam  

13. **Refrigeration system:** Single‑stage air‑cooled, fully hermetic compressor (imported 

from Europe/America), environmentally friendly refrigerant  

14. **Protection devices:** Compressor overload protection switch, refrigerant high‑pressure 

protection switch, ceramic fuse, water tray low‑water protection switch, electromagnetic switch, 

dry‑heating protection switch, alarm  

15. **Accessories:** Observation window, 2 adjustable shelves, interior lamp  

16. **Weight:** Approximately 95 kg  

17. **Power supply:** Single phase, AC 220V ±10%, 50/60 Hz  

**【Instrument Models】**  

| Model               | Internal Volume (L) | Internal Dimensions H × W × D (cm) |

|---------------------|---------------------|-------------------------------------|

| YS751‑III‑80        | 80                  | 50 × 40 × 40                        |

| YS751‑III‑150       | 150                 | 60 × 50 × 50                        |

| YS751‑III‑225       | 225                 | 75 × 50 × 60                        |

| YS751‑III‑408       | 408                 | 85 × 60 × 80                        |

| YS751‑III‑800       | 800                 | 100 × 100 × 80                      |

| YS751‑III‑1000      | 1000                | 100 × 100 × 100                     |

- **Temperature/Humidity Control:** Balanced Temperature & Humidity Control (BTHC) system  

- **Operating environment:** +5°C to +35°C  

- **Heater:** Nickel‑chromium alloy wire heater  

- **Humidifier:** Surface evaporation type  

- **Fan:** Centrifugal fan  

- **Airflow mode:** Broadband forced airflow circulation (upper outlet, lower inlet)  

- **Condensation method:** Air‑cooled or water‑cooled