**Assmann Aspirated Psychrometer (Electric Model)
SY-Type Electric Aspirator SY-3 / Yoshino Seisakusho
Manufactured in 1980 (Showa 55)**
This item is an electric Assmann aspirated psychrometer used for meteorological observation and environmental measurement.
It is equipped with the "SY-Type Electric Aspirator SY-3" mechanism manufactured by Yoshino Seisakusho.
It is a specialized instrument designed to determine accurate relative humidity by maintaining a constant airflow over the wet-bulb and dry-bulb thermometers.
This unit was manufactured in May 1980 and is now a rare model in both research institution and collector markets.
■ Manufacturer
Yoshino Seisakusho
A Japanese manufacturer of measuring instruments
Manufacturer of electric aspirators (SY-type)
■ Country of Manufacture
Japan
■ Date of Manufacture
May 1980 (Showa 55)
*Confirmed via the nameplate shown in the image
■ Model Number
SY-3 (Electric Aspirator)
■ Product Overview
The Assmann aspirated psychrometer is a meteorological instrument that simultaneously measures dry-bulb and wet-bulb temperatures under forced airflow.
It determines accurate relative humidity based on the temperature depression of the wet-bulb thermometer (the difference between dry-bulb and wet-bulb temperatures).
As this is an electric model, it can stably maintain a constant airflow,
making it suitable for outdoor observation, research applications, educational institutions, and environmental measurement. ■ Functions
Air temperature measurement via dry-bulb thermometer
Temperature measurement for humidity calculation via wet-bulb thermometer
Constant airflow via electric fan (DC 3V)
Humidity calculation (based on the dry-wet bulb temperature difference)
Can be used as a portable Assmann psychrometer
■ Features
Robust metal construction typical of Japanese-made instruments from the Showa era
Clearly marked with date of manufacture and serial number on the nameplate
Electric fan ensures stable airflow and high measurement accuracy
Features the SY-style ventilation mechanism, which is rare in modern models
Aesthetically pleasing design suitable for collections, research, or display
■ Dimensions
350 × 55 × 25 mm
(Smaller than standard Assmann psychrometers; presumed to be a portable model)
■ Power Source
DC 3V (4 x AAA batteries)
■ Serial Number
No. 80335
(From the nameplate in the image)
■ Product Condition
Used
Shows some signs of wear (scratches/dirt)
Electric fan operation verified
* To operate the power switch, pull it forward to turn it on or off.
■ Included Accessories
Battery pack (custom exterior part)
* A decorative part that does not affect functionality
Includes everything shown in the images
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Product Information
Category
Measurement & Inspection
Thermometers & Hygrometers
Temperature & Humidity Meters
Brand
Assmann
Product Condition
Shows some signs of wear
Visible scratches or dirt present
Shipping
Shipping included (Seller pays for shipping)