Psychron Aspirated Psychrometer

Aspirated Psychrometer

The Psychron is a portable battery powered and motor aspirated psychrometer. It has many important advantages over conventional sling type psychrometers. No whirling or special technique is required to operate this portable instrument, making it easier and safer to use in close quarters.
  • Measures Temperature & Humidity
  • Aspirated
  • Rapid Response
  • Molded Plastic Housing
  • Full-Length Thermometer Viewing

A precise aspiration rate is obtained by a turn of the switch, thus eliminating the danger of expensive thermometer breakage and human errors which can occur with sling type psychrometers.

The Belfort Psychron® consists of a pair of wet and dry bulb thermometers, a thermometer lighting system, a small fan motor (powered by three standard size “D” batteries) and a molded housing. The fan motor is operated by a push button, power off/on, and the illumination light is controlled by a knob on the side of the housing. A turn of the switch, past the “on” position, provides illumination to the thermometers. A psychro¬metric slide rule and instruction book are supplied.

Psychron thermometers are graduated from + 10° to + 110°F. Psychrons may also be purchased with centigrade thermometers graduated from – 15° to + 45°c. Special ranges are available at a nominal cost. A sliding panel in the Psychron housing permits easy access to the battery compartment and the water bottle. Shielding from the effects of external heat radiation is provided by the removable air intake through which air is drawn at a rate exceeding 15 feet per second.


  • Psychrometric Slide Rule
  • One 1 oz. Plastic Water Bottle
  • Instruction Manual (PN 509942)

Product Specifications

Specs Details
  • +30 to + 120°F
  • + 10 to + 100°F
  • + 10 to + 110°F
  • – 15 to + 45°C
Thermometer Accuracy Matched pair, within 0.3°F (.2°C)
Thermometer Graduations: 1°F (0.5°C)
Temperature Resolution 0.2°F (0.1°C)
Response Time 11/2 to 2 minutes
Psychometric Tables
  • Pressure = 30″Hg, + 10 to + 140°F for R.H. and dewpoint
  • Pressure = 29.24″Hg, -15 to +45°C for R.H.
Slide Rules
  • + 20 to + 100°F
  • (- 7 to + 38°C)
Battery Life 250 operations – when operated at rate of 2 min./hr. for 250 successive hours, with aspiration rate exceeding 15 f.p.s. (5 m/s)
Thermometer Length 87/8 in. (22.5 em)
  • Psychron: 1O”Lx45/16″Hx 113/16″D (25x 11 x4.6cm)
  • Carrying Case: 107/16″ Lx 63/16″ H x 27/8″ D (26x 16×7.3cm)
Weight Complete with accessories (less Batteries), 3 Ibs. (1.4 kg)
Shipping Weight 6lbs. (2.8 kg)