![]() However, AutoCal should not replace true calibration against a known standard. Or when you require verification, a result or need to inspect an instrument’s performance. Every two to three months as part of a regular service and maintenance routine is acceptable. Pneumatech offers a wide and field proven product portfolio for dew point sensors. The net results include: reduced downtime, minimised calibration costs and immediate verification of the dew point system. Automatic calibration of SHAW dew point instruments allows the user to ensure optimum accuracy between laboratory calibrations by checking the span of the dew point hygrometer and correcting for any deviation.Ĭomplete AutoCal in-situ, without the need for any special equipment or skilled personnel. This synchronises the dew point sensor and the instrument and prepares them for use. Then, raise the desiccant head and follow the process to complete AutoCal on the instrument. To perform AutoCal simply expose the sensor to any atmosphere which is wetter than its operating range (usually, room air is sufficient). It provides an easy-to-use functionality which offers many benefits.ĪutoCal involves routine checks of the sensor. Integrated into SHAW dew point instruments, AutoCal is a major advantage and one of the most important and unique features of the SHAW system. This forms the basis of AutoCal (automatic calibration). It then ceases responding to any further increase in moisture. Therefore, exposing the sensor to moisture above its maximum operating range, will rapidly bring it into equilibrium. We manufacture each dew point sensor precisely to saturate with water vapour at its design maximum. All three of which are due to the proprietary manufacturing techniques used in the construction of the sensor. The SHAW dew point sensor includes three major advantages over other sensors: specificity, stability and AutoCal (automatic calibration). The temperature difference between the two thermometers is converted into a dew point temperature using a chart.Shaw Moisture Meters manufacture the sensor base layer with such precision to ensure a stable, reliable and drift free moisture sensor. The thermometers have to be ventilated by either whirling the instrument around or using a fan.Īfter a few minutes, the temperature of the wet-bulb stabilizes at a particular temperature. ![]() The temperature of the wet-bulb thermometer drops according to the rate of evaporation, which depends on the dew point. ![]() A psychrometer consists of two thermometers, one of which has a wet wick around its bulb and is called the wet-bulb thermometer.Įvaporation of water off the wick removes heat from the thermometer. The reduction in the measured reflected light indicates the mirror is at the dew point temperature.Ī psychrometer is an alternative instrument for determining the dew point. The water droplets on the chilled mirror block light from reaching the detector, causing the reflected light beam to look less bright. Further on you can learn about details of relative humidity, heat index and dew point. When the mirror surface cools to the dew point temperature, dew forms on the mirror. These sensors are relative humidity sensors with a built in temperature sensor (which allows the humidity reading to be more accurate - see table below for accuracy of the device). The light beam is reflected off the mirror into the detector, which measures the brightness of the reflected light. One way to measure the dew point is based on the observation that a bathroom mirror will “fog up” when the temperature equals the dew point during a bath or shower.Ī dew point hygrometer consists of a small mirror, a narrow light beam and a light detector.
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