Description
Sling Psychrometer Whirling Hygrometer Thermometer, Wooden Body, Type Centigrade, Dry & Wet Bulb Range -5°C to +50°C
Precision Wooden Sling Psychrometer for Accurate Humidity and Temperature Measurement
The “Ji” Japsin Instrumentation Sling Psychrometer Whirling Hygrometer Thermometer with Wooden Body is a precision-engineered environmental measuring instrument designed for accurate determination of relative humidity (RH) and ambient air temperature using the internationally accepted psychrometric principle. Featuring Dry Bulb and Wet Bulb thermometers with a measuring range of -5°C to +50°C, this instrument provides dependable humidity measurement without requiring electricity, batteries, or electronic sensors.
Designed with a high-quality polished wooden body for strength and durability, the Ji Japsin Sling Psychrometer is widely used in meteorological stations, laboratories, HVAC systems, pharmaceutical industries, textile mills, agriculture, greenhouses, educational institutions, environmental monitoring, research laboratories, warehouses, food processing plants, and industrial quality control.
Its simple manual operation, reliable mechanical construction, and precision thermometers make it one of the most trusted instruments for field humidity measurements. The wooden body provides excellent handling comfort, lightweight portability, and long-term durability, making it suitable for both indoor and outdoor environmental monitoring.
Reliable Humidity Measurement Using the Psychrometric Principle
Humidity is a critical environmental parameter that influences manufacturing processes, product storage, scientific research, weather forecasting, and indoor air quality. The “Ji” Japsin Instrumentation Sling Psychrometer determines humidity by measuring the difference between two temperatures:
- Dry Bulb Temperature
- Wet Bulb Temperature
When the instrument is rotated through the air, evaporation from the wet bulb lowers its temperature. The difference between the wet bulb and dry bulb readings is then used to determine Relative Humidity (RH) using a psychrometric chart or humidity table.
This proven method is internationally recognized for its accuracy and reliability.
Wide Measuring Range
The instrument is equipped with two precision glass thermometers, each covering the same operating range.
Temperature Range
- Dry Bulb: -5°C to +50°C
- Wet Bulb: -5°C to +50°C
This range makes the instrument suitable for a variety of environmental conditions, including:
- Indoor climate monitoring
- Outdoor weather observation
- Agricultural applications
- Laboratory environments
- Industrial workplaces
- Warehouses
- Greenhouses
- HVAC systems
- Educational laboratories
The thermometer provides stable and accurate readings across the complete measuring range.
High-Quality Wooden Body Construction
One of the distinguishing features of this sling psychrometer is its premium wooden body, which offers both durability and a classic professional appearance.
Benefits
- Strong and durable construction
- Comfortable grip during operation
- Lightweight for field use
- Resistant to everyday handling
- Excellent balance while whirling
- Long operational life
The polished wooden body enhances user comfort and ensures smooth operation during repeated measurements.
Manual Whirling Mechanism
The sling psychrometer is operated by rotating the instrument through the surrounding air using the attached handle.
During rotation:
- Air passes uniformly over both thermometers.
- The wet bulb experiences evaporative cooling.
- The dry bulb measures ambient air temperature.
- The temperature difference is established.
- Relative humidity can then be accurately determined.
Advantages
- Uniform airflow
- Accurate psychrometric readings
- Quick stabilization
- Reliable humidity determination
- Suitable for field measurements
The manual whirling design eliminates dependence on powered fans or electronic airflow systems.
Dry Bulb Thermometer
The Dry Bulb thermometer measures the actual ambient air temperature.
It provides:
- Accurate environmental temperature
- Reference for humidity calculation
- Stable temperature indication
- Reliable atmospheric monitoring
This thermometer remains unaffected by moisture evaporation.
Wet Bulb Thermometer
The Wet Bulb thermometer is covered with a water-moistened wick.
As the instrument rotates:
- Water evaporates from the wick.
- Evaporation lowers the thermometer temperature.
- The cooling effect depends on surrounding humidity.
- Temperature difference determines relative humidity.
The greater the evaporation, the lower the wet bulb temperature and the lower the humidity.
Accurate Relative Humidity Measurement
After recording the Dry Bulb and Wet Bulb temperatures, Relative Humidity (RH) is determined using:
- Psychrometric charts
- Humidity tables
- Psychrometric calculators
- Standard humidity formulas
This method is widely accepted by:
- Meteorological organizations
- Scientific laboratories
- HVAC engineers
- Environmental researchers
- Agricultural specialists
The instrument provides dependable humidity measurements without electronic sensors.
Ideal for Multiple Industrial Applications
The Sling Psychrometer is suitable for a wide variety of industries and professional applications.
1. Meteorological Departments
Used for atmospheric humidity monitoring and weather observations.
2. Agriculture
Helps monitor environmental conditions for crop protection, irrigation planning, and greenhouse management.
3. Greenhouses
Maintains ideal humidity levels for healthy plant growth.
4. Pharmaceutical Industry
Monitors controlled environmental conditions during production and storage.
5. HVAC Industry
Measures humidity during installation, servicing, and maintenance of heating and air conditioning systems.
6. Textile Industry
Maintains proper humidity during spinning, weaving, dyeing, and finishing operations.
7. Food Processing
Monitors environmental conditions during food manufacturing and storage.
8. Laboratories
Used for environmental testing, calibration work, and scientific experiments.
9. Educational Institutions
Ideal for demonstrating humidity measurement principles in schools, colleges, and engineering laboratories.
10. Warehouses
Ensures suitable humidity levels for sensitive materials and products.
Portable and Easy to Use
The Sling Psychrometer is designed for field portability.
Its lightweight construction allows users to perform humidity measurements virtually anywhere.
Operation is simple:
- Wet the wick with clean distilled water.
- Hold the instrument by the handle.
- Rotate it smoothly for approximately 20–30 seconds.
- Record the Dry Bulb and Wet Bulb temperatures.
- Use a psychrometric chart to determine Relative Humidity.
No complicated setup or calibration is required for routine measurements.
Maintenance-Free Operation
Since the instrument contains no electronic components, maintenance requirements are minimal.
Routine maintenance includes:
- Keeping the thermometers clean
- Replacing the wet bulb wick when necessary
- Using clean distilled water
- Protecting the glass thermometers during transport
- Periodic calibration checks
Proper care ensures years of dependable performance.
Long Operational Life
Every Sling Psychrometer is manufactured with precision components to deliver reliable long-term performance.
Its robust design provides:
- Excellent measurement stability
- Long calibration life
- Reliable field performance
- Durable construction
- Accurate humidity measurement
- Extended service life
The combination of a sturdy wooden body and precision thermometers makes it an ideal instrument for professional use.
Why Choose Sling Psychrometer?
“Ji” Japsin Instrumentation is known for manufacturing precision environmental and process measurement instruments trusted by professionals across multiple industries. This Wooden Body Sling Psychrometer combines traditional mechanical reliability with precision temperature measurement to deliver accurate humidity determination in both laboratory and field conditions.
Whether used in meteorological stations, HVAC systems, pharmaceutical plants, greenhouses, agricultural research, laboratories, educational institutions, textile mills, food processing facilities, warehouses, or environmental monitoring projects, the “Ji” Japsin Instrumentation Sling Psychrometer Whirling Hygrometer Thermometer provides dependable humidity measurement, accurate temperature monitoring, and exceptional long-term reliability. Its traditional wooden construction, precision centigrade thermometers, and proven psychrometric measuring principle make it an indispensable instrument for professionals requiring accurate environmental monitoring.
Japsin Instrumentation – Since 1974
Nikhil Choudhury –
Quality product
Kiara Kapoor –
Good Product
Tanaya Choudhury –
Nice Product