Vector - Model H301 -Aspirated Psychrometer

A double-walled element enclosure minimizes errors due to thermal radiation and an optional radiation shield (/RS) is available to reduce errors due to sunlight.

A long-life motor/fan ensures a high air flow past the sensing elements for an accurate wet-bulb depression.

The instrument construction is weather resistant while retaining easy access to the sensing elements for calibration, cleaning and wick replacement. A 500ml water reservoir provides for over 7 days continuous operation.

Note: This sensor does not contain any signal conditioning or amplifiers to process the sensing element signals. Most data loggers can be configured to measure PRT/RTD sensors in a 3 or 4-wire bridge circuit, and can often also be set to control the fan/motor too.

• Accuracy:  0.2°C (in normal meteorological conditions)
• Temperature Range: -20 to +65 °C
• Response Time: 50 seconds
• Maximum Wind Speed: over 75 m/s (170mph, 150kts)
• Sensing Elements: Two, each 100 Ohm RTD/PRT (100 Ohm+/-0.033% at 0°C) 1/3-DIN43760
• Configuration: Wired as a pair of 4-terminal resistors
• Air Speed Past Elements: 4 m/s, BS4485 (fan rated 40m3/hour)
• Fan/Motor Supply: 12V DC (typically at 350mA)
• Rated Fan/Motor Life: 12,000 Hours (12V DC, 83% RH to DIN40046)
• Weight: 1.4Kg
• Cables: Fan/Motor Power:  5m 2-core
• Elements:  5m, 8-core (stranded 7/0.2mm, braided shield)