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Model 6020 Display and Intrinsically Safe Sensor
A sophisticated single-channel, panel mount display, expertly engineered to integrate seamlessly with the Alpha Moisture Systems Dewpoint Sensor.
The Model 6020, combined with the Dewpoint Sensor, forms a high-precision dewpoint hygrometer system, ideal for accurately measuring trace moisture in process gases and dry compressed air. This system ensures long-term stability, rapid response and high sensitivity with an accuracy of ±2 °C (±3.6 °F) dewpoint.
Designed for operator convenience, the Model 6020 features our unique automatic calibration (AutoCal) and three hotkey functions accessible from the front panel, allowing easy setup of alarm trip points, unit selection and access restrictions. RS485 connectivity means users can easily configure the device for integration with PC systems, providing digital output for remote data interrogation. Each system is factory-calibrated and supplied with a calibration certificate traceable to National & International Humidity Standards at the National Physical Laboratory (NPL).
Whatever the challenge — Alpha Moisture Systems has you covered.
- Highly customised solutions
- Trusted by industry leaders
- Distributors worldwide
- Over 30 years experience
Enhanced field data accessibility and analysis
Key features
- User-selectable engineering units: °C or °F dewpoint, ppm(V), ppm(w), g/m³, or lb/MMSCF, offering flexibility to suit various measurement needs and preferences.
- Full compatibility with Alpha Moisture Systems’ intrinsically safe sensors for hazardous areas, enabling safe use up to 1km away from the display without signal loss when used with a Zener Barrier.
- Designed for installation in safe areas, with an optional Exd Flameproof Enclosure available for use in hazardous environments, ensuring versatility and safety across various industrial applications.
- Dewpoint ranges available from -110 °C to +20 °C (-166 °F to +68 °F), ensuring suitability for a wide spectrum of applications.
- The AutoCal (automatic calibration) function, when paired with an Alpha Moisture Systems sensor, facilitates easy accuracy maintenance between laboratory calibrations.
- Includes an onboard pressure dewpoint calculator with pre-loaded data for Natural Gas, enhancing the system’s utility across various gas types.
- Two fully programmable alarms with 10A relay contacts and status LEDs for effective monitoring and alerting.
- A coaxial cable connection supports distances of up to 1000 metres, ensuring flexible installation options.
- RS485 communication port for straightforward digital output, enabling comprehensive data management and analysis.
- Optional external logging capabilities via RS485 to a Windows computer for advanced data tracking and analysis.
Technical Data
General | |
| Sensor/Transmitter Type | Display Only - Operational with Dedicated Sensor |
| Documentation | Instruction manual |
Sensor | |
| Sensing Element | Ultra-High Capacitance - Aluminium Oxide Type |
| Dewpoint Range | Overall range offered between -110 °C to +20 °C (-166 °F to +68 °F) dewpoint -110 °C to -20 °C (-166 °F to -4 °F) dewpoint -100 °C to 0 °C (-148 °F to +32 °F) dewpoint -80 °C to +20 °C (-112 °F to +68 °F) dewpoint |
| Approvals | CE, UKCA |
| Automatic Calibration | Span check and correction are performed using the potentiometer on the front of the instrument. |
| Factory Calibration | Supplied with a calibration certificate traceable to National and International Humidity standards. |
| Accuracy | ± 2 °C (±0.36 °F) dewpoint |
| Resolution | 0.1 °C, 0.1 °F dewpoint or 0.1 ppm(v) |
| Repeatability | Better than ±0.3 °C (±0.54 °F) dewpoint |
| Operating Temperature | -20 °C to +50 °C (-4 °F to +122 °F) |
| Storage Temperature | -20 °C to +70 °C (-4 °F to +158 °F) |
| Response Times | Wet to dry: -20 °C to -60 °C - less than 120 secs Dry to wet: -100 °C to -20 °C - less than 20 secs |
| Sample Flow Rate | Flow independent, ideally 2 - 5 L/m. Max: 20 L/min |
| Calibration Warranty | 12 months from date of dispatch |
Electrical | |
| Electromagnetic Compatibility (EMC) | Immunity: Complies with EN 61326 Emissions: Complies with EN 61326 |
| Warm Up Time | 5 seconds |
| Fault Conditions | Short circuit/over range: display reads “Short” and output drives to 24.0 mA |
| Output Signal | Isolated 4 - 20 or 0 - 20 mA Linear |
| Operating Voltage | 90 to 250 V AC 50/60 Hz or 18-28 V DC |
| Display | Red 7-segment 5-digit primary display and secondary display. |
| Display Dimensions | 14mm (0.71 inches) primary display, 7mm (0.3 inches) secondary display. |
| Alarms | Two single pole changeover contacts (NO/C/NC), rated at 10 A at 240 V AC. Alarm trip at set point with 0.1 °C (or equivalent) hysteresis to eliminate relay chatter |
| Alarm Relay Output/Contact Type | Single pole, changeover (SPCO) |
| Annunciators | Alarm 1 and Alarm 2 status LEDs |
| Engineering Units | C and °F dewpoint, ppm(v), ppm(w), g/m³ or lb/MMSCF |
| Load Impedance | 500Ω max |
| Power Supply | AC: 90 – 250VAC, 50/60Hz / DC: 18-28VDC |
| Power Consumption | AC=10VA/DC=4VA max |
| Serial Communications | Serial asynchronous, UART |
| Isolation | 1000 Vrms |
| Logging Software | Refer to the manual for full specifications |
| Data Format | Open; one start bit, even parity, seven data bits and one stop bit. |
| Physical Layer | RS485. |
| Maximum no. of Addresses | 99 |
| Baud Rate | Selectable – 1200, 2400, 4800 or 9600. |
| Cable | Supplied with two metre low loss coaxial cable |
Mechanical | |
| Operating Pressure | From 1kPa (0.01 barA) to maximum 35,000 kPa (350 barA) |
| Operating Humidity (External) | 0-95% non-condensing |
| Enclosure | DIN Style, 144 mm wide, 72 mm high by 116 mm deep ABS case |
| Mounting | Panel-mount; press-fit fixing (DIN 43700) |
| Sensor Protection | 316 sintered stainless steel filter – 50 micron |
| Probe Material (Wetted Parts) | 316 stainless steel |
| Weatherproof Classification | Front panel seal only - IP54 |
| Cut Out Dimensions (H x W) | 68mm x 138mm |
| Terminals | Plug-in screw type |
| Dimensions in mm (H x W x D) | 72 x 144 x 108 |
| Weight | 470 g |
| Mechanical Warranty | 12 months in case of defective parts or faulty workmanship |
Downloads
What's in the box
Model 6020 Display
2m Coax Cable
Model 6020 Manual
Applications
AerospaceProduction of extremely high-specification aeronautical parts can require vacuum furnace heat treatment using very dry argon. NADCAP standards also specify testing welding shield gas at the torch head to ensure dryness. Continuous measurement of trace moisture ensures that the feed gas used for shielding remains within the specified moisture content range, allowing operators to maintain ideal conditions.
Food and BeverageIncorrect levels of moisture in foodstuffs can lead to loss of food quality. The shelf life of foods packaged in plastic can be extended by replacing ambient air with very dry gases such as Nitrogen and carbon dioxide between the foil layer and the food. The continuous measurement of trace moisture can significantly reduce waste and carbon footprint.
HDPE ProductionEthylene and propylene are perhaps the two most important compounds used in industry today, acting as building blocks for manufacturing a wide range of chemicals and plastics. Accurate and consistent measurement of trace moisture will help with process optimisation, prove gas product quality and polymerisation yield, and reduce corrosion in pipelines and maintenance costs.
Injection MouldingMoisture adsorbed on the surface of plastic pellets that feed injection moulders can cause extrusion failures, decreasing the strength of the product and affecting its surface finish, colour and opacity. Dry air circulates through the pellets, removing moisture, and ensuring they are dry. Increase process efficiency and decrease costs by measuring trace moisture to detect any failure of the dryer.
Medical GasesThe compressed air and gases used for patient care in medical applications need to be clean and almost sterile. Contaminants can be harmful to the health of patients if they are not controlled. Condensation in gas systems may result in interference with critical apparatus, leading to corrosion. The warm temperatures in hospitals, coupled with high humidity risk bacterial growth. HTM02, the Health Technical Memorandum, recommends that “all medical gas supplies should be continuously monitored for dew point or moisture content” in the air/gas line.
Natural Gas and LNGLiquification and regasification of natural gas have become integral and vital to the supply of global energy. The presence of moisture in the transportation of natural gas poses significant challenges, including the risk of freezing in vital pipelines and valves. Ensuring accurate measurement of trace moisture ensures gas quality, protecting downstream systems and extending the functional longevity of desiccant materials.
PharmaceuticalsExcessive or deficient moisture content can impact the physical properties of a pharmaceutical product, affecting the product’s chemical reactivity, binding properties and shelf life. Moisture content fluctuates from batch to batch, so a reliable method is required to determine accurate moisture content and achieve consistency. The trace moisture measurement instrument must be fast, repeatable and accurate for continuous online dewpoint control of blanketing gases.
Power GenerationEnsuring the safe, clean and efficient production of energy is a key concern for all energy producers. New technologies and legislation are forcing changes and development in the production and supply of energy. Monitoring and measuring trace moisture will protect your equipment, reduce costs and improve efficiency.
Speciality GasesBottled gases certified for use as “calibration gases” must often specify the trace moisture content along with other contaminants. Therefore, suppliers and users need accurate measurements of this moisture level so that much less of the valuable product is expended in the test process.
Frequently Asked QuestionsIf you have a question that’s not answered below, please contact us
Can the Model 6020 be used to sample gas or air in hazardous areas/zones?
Yes, sampling in hazardous areas with the Model 6020 is possible using two methods. One approach involves installing the Model 6020 and Zener Barrier in a safe zone, with the intrinsically safe sensor positioned in the hazardous area. Alternatively, if the entire system must be located in a hazardous area, the Model 6020 should be encased within our Exd Flameproof Enclosure.
Where can I purchase the Model 6020 display and a compatible sensor?
What is the lead time for the Model 6020 display and sensor?
Can I log measurements with the Model 6020?
Are there alternatives if I prefer not to install the Model 6020 into a panel?
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Moisture Systems
If you require a customised trace moisture measurement solution, book a consultation with our expert technical team and find out how you can increase the efficiency and productivity of your operations.
Dewpoint Calculator for Trace Moisture Measurement
in Gases & Compressed Air