Polymeter

The Polymeter is a combined hygrometer-thermometer for measuring and determination of:

• Air temperature,
• absolute and relative humidity,
• Saturated vapor pressure,
• Vapor pressure,
• dew point and
• Saturation deficit.

It is characterized by ease of use and high reliability.

The parts of the measuring stations are made of brass and are plated. All axles are mounted in stone, whereby the instruments only have a minimum static friction.

As a measuring element for the air temperature is a glass thermometer with alcohol filling.

As a measuring element for determining the relative humidity, the moisture-dependent change in length is used by natural hair. The hair specially treated is characterized by a low, even at very low temperatures display inertia. Therefore Haarpolymeter are also suitable for outdoor measurements. For measurements in production and storage areas Polymeter are recommended with synthetic fibers, as they are less maintenance (regeneration) and require less sensitive to contamination.

 Measuring ranges: 0 ... 100% RH -35 ... + 45 ° C

Accuracy: ± 3% RH ± 1 KAlkohol Thermometer

Scale division: 1% RH 1 ° C

Particular importance has the Polymeter for frost forecast, the following are physical laws underlying: night radiates the ground its heat into the room from; most with uncovered sky. The cooling of the ground is transmitted to the boundary layer air. However, the cooling of the air there is a limit. Upon reaching the dew point temperature of water vapor contained in the air condenses, and heat is released. If the dew point in the evening at 0 ° C or below, for which there is frost danger.

The main features of Polymeters with hair hygrometer and alcohol thermometer are:

• Applicable up to 0 ° C
• fluctuations in the relt. Humidity there is a self-regeneration of natural hair
• low hysteresis of hygrometer
• high reaction rate by rolled hair
• Alcohol thermometer backed with Skale
• good handling
• high reliability
• easy handling