DPH-2020 Industrial Dew Point Hygrometer
The DPH-2020 is a two stage dew point hygrometer using the chilled mirror principle to determine the absolute humidity of a gas in terms of its dew- or frost-point temperature. It was specifically designed for critical industrial process applications. A state-of-the-art digital control system maintains the sensor mirror at the equilibrium point-- the point where a dew or frost layer is established on the mirror surface. A platinum resistance thermometer monitors the mirror temperature, which represents the dew- or frost-point temperature. Depending on the actual dew point, settling time from ambient may take a few seconds to one minute. Frost point measurements to –60° C or lower can be made. The high temperature Model DPH-2012 can make dew point measurements up to +120° C.
Chilled mirror dew point hygrometers are used in a wide variety of industrial process-control and laboratory applications to ensure product quality, including:
The DPH requires a sample stream of air or gas. The sample enters and exits the sensor via 1/8 National Pipe Thread (NPT) ports. Flow rates should be maintained between 0.2 and 1.0 standard cubic feet per hour (SCFH). The sensor operates between temperatures of –60° C to +80° C. A front panel DPM indicates the current dew point temperature to the user and set point relay contacts are provided. A Windows application supports remote viewing or integration with SCADA systems. The DPH-2020 can run from AC line or 12Vdc battery power; the DPH-2012 requires AC power.
Unlike other sensors (polymer or aluminum oxide) that must be discarded once contaminated, a chilled mirror hygrometer can easily be cleaned to restore its performance. To restore proper operation of the sensor, the measurement chamber can be easily opened, inspected, and cleaned. A mirror microscope provides a means of inspecting the condition of the mirror prior to opening. The top of the sensor hinges open easily without tools via a single finger-operated spring clip. The cleanliness of the sample gas governs how often the mirror will need to be cleaned, but it is typically an interval from days-to-months.
Compare these features we offer at no extra cost:
Standard Accessories Provided at No Extra Charge
Totally inert mirror sensor chamber