DPS3 Heated Dew Point Hygrometer System
Primary Method Heated Chilled Mirror Hygrometer for High Temperature, High Dew Point Process Gas
Starting at: $7,700
The DPS3 Heated Dew Point Hygrometer System continuously measures the dew or frost point of hot, moisture-laden process gases that would condense inside a standard sensing system. As a heated chilled mirror hygrometer, the DPS3 extracts a gas sample through a heated hose, transports it through a fully heated sampling system, and measures dew/frost point directly using a two-stage chilled mirror sensor — the primary method dew point measurement technique recognized as a measurement standard across pharmaceutical, fuel cell, and process industries.
Purpose-built for high dew point measurement in process gas where the sample’s dew point is at or above ambient temperature, the DPS3 heats every component in the sample path — including the chilled mirror sensor — to prevent the condensation that defeats unheated instruments. The result is stable, accurate dew/frost point readings from –35°C to +95°C (–31°F to +203°F), with ±0.2°C accuracy and ±0.05°C repeatability, plus standard 4–20 mA, voltage, and RS-232 outputs for straightforward PLC, DCS, and SCADA integration.
Key Features
| Feature | Description |
|---|---|
| Measurement Type | Heated chilled mirror hygrometer for high dew point measurement in hot process gas |
| Sensor Technology | HTS2 two-stage chilled mirror sensor (primary method dew point measurement) |
| Dew/Frost Point Range | –35°C to +95°C (–31°F to +203°F) |
| Measurement Accuracy | ±0.2°C (±0.4°F) |
| Repeatability | ±0.05°C (±0.09°F) |
| Heated System Temperature Range | 20°C to 99°C (68°F to 210°F), user programmable |
| Mirror Material | Chrome (standard); platinum (optional) |
| Sample Flow | 0.5 to 5.0 SCFH (0.25 to 2.5 L/min), integral adjustable flowmeter |
| Sample Pressure | 0 to 200 psig |
| Sample Connection | ¼ in. compression fitting |
| Heated Sample Hose | 3 ft. included (extended length available) |
| Analog Outputs | Selectable 4–20 mA, 0–5 Vdc, or 0–10 Vdc |
| Digital Output | RS-232 serial, standard |
| Alarm Relays | Two, standard |
| Automatic Balance Control | Standard — automatic correction for mirror optics contaminants |
| Enclosure | Insulated NEMA 4 heated sampling enclosure; IP65 electronics enclosure |
| Display | Dew/frost point temperature, system set point temperature, system actual temperature |
| Power | 100 or 240 Vac, 50/60 Hz, 250 W (specify voltage at order) |
| Options | Sample flow switch (-FS), sample flow alarm lamp (-FSL), cart mount (-CART), extended sample hose (-10HOSE), extended warranty, multi-calibration package |
Reliable High Dew Point Measurement in Hot Process Gas The DPS3 measures dew/frost point up to +95°C (+203°F) by heating the entire sample path above the gas dew point — eliminating the condensation that causes unheated sensors to fail. Primary Method Accuracy The chilled mirror sensing technique is a direct, primary method of dew point measurement recognized as a measurement standard. The DPS3 delivers ±0.2°C accuracy with ±0.05°C repeatability, supporting tight process control and regulatory documentation. Eliminates Sensor Failures from Condensation By heating the sampling system, hose, and sensor above the sample dew point, the DPS3 prevents the water condensation that destroys standard hygrometers in saturated or near-saturated gas streams. Self-Maintaining with Automatic Balance Control Standard Automatic Balance Control compensates for mirror optics contamination over time, reducing drift and extending the interval between manual service. Easy Integration into Process Control Systems Selectable 4–20 mA, 0–5 Vdc, or 0–10 Vdc analog outputs, two alarm relays, and RS-232 serial output make it straightforward to integrate the DPS3 into PLC, DCS, and SCADA environments. Built for Long Service Life No moving parts, no consumable sensor element, and a robust heated NEMA 4 enclosure mean reduced down-time, lower maintenance frequency, and a long operating life in demanding industrial environments.
The DPS3 is deployed wherever dew point measurement in hot process gas is required, particularly where saturated or near-saturated conditions would compromise an unheated hygrometer.
- Pharmaceutical dryer dew point sensor for fluidized bed dryers and pharmaceutical powder drying
- Moisture endpoint detection in granulation and drying cycles
- Dew point monitoring in product drying chambers supporting batch documentation and GMP compliance
Fuel Cell Testing and Development
- Fuel cell dew point measurement on anode and cathode gas streams
- Humidification control verification in PEM fuel cell test stands
- R&D dew point monitoring across fuel cell test cycles
Heat Treating, Annealing, and Furnace Operations
- Dew point monitoring in furnace atmospheres and bright annealing protective gases
- High temperature dew point sensor for heat treat ovens and atmosphere generators
- Detecting moisture ingress that can drive oxidation, decarburization, or surface defects
- Leakage testing of nuclear reactors and containment systems
- Nuclear process monitoring where primary method measurement traceability is required
- Combustion process moisture monitoring
Industrial Drying and Process Chambers
- Wood veneer drying and lumber kiln moisture monitoring
- Bakery oven and food drying chamber dew point measurement
- Elevated temperature process chambers and exothermic process monitoring
- Plastics and molding process moisture control
Chemical Processing
- Chemical reactor headspace and vent gas dew point measurement
- Dew point measurement in hot process gas where chemically aggressive samples require platinum mirror or stainless steel sensor options (see DPS4)
- Process control verification in steam-bearing or high-humidity reactor streams
Frequently Asked Questions
Q: Why do I need a heated dewpoint hygrometer instead of a standard one?
A: When the dew point of the sampled gas is at or above the temperature of the sensing system, the gas saturates inside the instrument and liquid water condenses in the tubing and sensor, making reliable readings impossible and often damaging the sensor. A heated chilled mirror hygrometer like the DPS3 keeps the entire sample path above the gas dew point, preventing condensation and enabling reliable high dew point measurement.
Q: What dew/frost point range can the DPS3 measure?
A: The DPS3 measures dew/frost point from –35°C to +95°C (–31°F to +203°F). The heated system temperature is user programmable from 20°C to 99°C (68°F to 210°F).
Q: What is “primary method” dew point measurement and why does it matter?
A: The chilled mirror technique directly measures the temperature at which water condenses on a controlled mirror surface — there is no inferential calculation or calibration curve. This makes it a primary standard measurement technique, valued in pharmaceutical, fuel cell, and nuclear applications where measurement traceability and defensible accuracy are required.
Q: Can the DPS3 measure dew point in a fuel cell test stand?
A: Yes. The DPS3 is widely used for fuel cell dew point measurement on humidified anode and cathode streams, where high dew points and elevated temperatures rule out unheated sensors.
Q: Does the DPS3 offer pressure–dew point compensation or an advanced display?
A: Those features are available on the other models in the DPS Series. The DPS4 adds pressure measurement and pressure–dew point compensation, plus front-panel access to Automatic Balance Control. The DPS5 replaces the integrated microprocessor with an externally mounted DewMaster deluxe hygrometer for advanced display, alarms, and interface options.
Q: Is the DPS3 NIST traceable?
A: Yes. All Edgetech Instruments calibrations are traceable to NIST and performed in an ISO/IEC 17025:2017 accredited calibration laboratory.
Q: Can the DPS3 be moved between sample points?
A: Yes. A cart-mounted version is available (-CART option) with a portable steel frame, 10-foot heated sampling hose, and 10-foot power cord — ideal for facilities monitoring multiple process points.
Q: What sample pressure can the DPS3 handle?
A: The DPS3 accepts sample pressure from 0 to 200 psig with positive pressure sample gas. For near-ambient-pressure or sub-ambient samples, the DPS4 and DPS5 offer a vacuum pump option for sample extraction.
Configure Your DPS3 Heated Dew Point System
Need help selecting the right configuration for dew point measurement in hot process gas? Edgetech Instruments can help you specify a complete DPS3 system, including:
- Mirror material selection (chrome standard, platinum for aggressive or nuclear applications)
- Sample flow detection options (-FS dry contact switch or -FSL with red lamp alarm)
- Cart-mount configuration for portable, multi-point monitoring
- Extended-length heated sample hose
- Calibration packages and extended warranty
- Guidance on choosing between the DPS3, DPS4, and DPS5 for your application
Call 978-310-7760 or request price and availability to configure your heated dewpoint hygrometer solution.
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