DPH-2020 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 point¾ 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.
Rugged stainless steel sheeted mirror provides extra durability in industrial applications
Convenient front panel digital readout
Multi-stage/extend operating range
Both analog and RS-232 serial outputs
Two alarm limit relays for control use
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:
DPH sensor cross-section view
DPH sensor rear view
DPH sensor bottom view of heat sink and integrated
Standard Accessories Provided at No Extra Charge
Totally inert mirror sensor chamber
Full digital control for precise operation
Analog and digital outputs, PLUS alarm relays
Mirror microscope permits visual verification of dew layer and mirror state during operation
Forced air cooling improves reliability
Auxiliary liquid cooling loop permits even lower temperature depression operation
101 Industrial Blvd.
Turners Falls, MA 01376 USA
Fax: (413) 863-0255
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This page was last updated on Monday, September 11, 2006 .