Description

The compact Bacharach Sling Psychrometer uses the accurate wet bulb-dry bulb thermometer principle to provide a simple, rapid measurement of relative humidity without tables, charts, or formulas. 

Portable and non-electronic, the sling psychrometer consists of two thin bulb thermometers and a refillable water reservoir in a high-strength plastic case. There is no need to wet the wick each time a reading is made. The case is simply whirled freely in the hand; wet and dry bulb temperature readings are taken; and percent relative humidity is determined from the built-in slide rule on the handle. When not in use, the thermometer case telescopes into the handle for protection.

Thermometers in sling psychrometers are filled with non-toxic red spirit (alcohol) and are calibrated in °F.

Features

• Easy to use and designed for portability.
• Slide rule construction quickly converts temperature to relative humidity.
• Built-in reservoir holds sufficient water for several hours of testing.
• Thin thermometer bulb gives fast thermal response.
• Thermometers constructed of shock-resistant glass.
• Stems have deep-etched numerals and 1° scale divisions for easy reading.
• Inexpensive, reliable and accurate.

Operation

The Sling Psychrometer can be easily operated by following these steps:

• Be sure the wick on the wet bulb is clean and saturated with water while the bulb on the other thermometer is dry.
• Whirl the Psychrometer body at a rate of two or three revolutions per second (120 to 180 RPM) for a minimum of 1½ minutes to allow the thermometer indications to stabilize.
• Immediately read the wet bulb temperature first and then the dry bulb temperature.
• For dry bulb temperatures above 70°F (21°C), use the high range scale on the sleeve-handle. If the dry bulb temperature is below 70° (+21°C), use the low range scale.
• Set the wet and dry bulb temperatures opposite each other on slide rule and read %RH on the lower scale.

Applications

Sling Psychrometers have many applications in commercial and industrial applications. Some of these are:

• Hospitals
• Computer rooms
• Laboratories
• Industrial plants
• Colleges and schools

• Critical storage areas
• Manufacturing plants
• Air conditioned environments
• Athletic & sport programs