Digital dew-point transmitter Model 6020

intrinsically safeflameproofhigh-precision

Product Overview
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 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).

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

What's in the box

• Model 6020 Display
• 2m Coax Cable
• Model 6020 Manual

Applications

• Aerospace: Production of high-specification aeronautical parts, vacuum furnace heat treatment, welding shield gas testing, continuous measurement of trace moisture in shielding gases
• Food and Beverage: Monitoring moisture in foodstuffs, extending shelf life with dry gases, reducing waste and carbon footprint
• HDPE Production: Monitoring trace moisture in ethylene and propylene for process optimisation and polymerisation yield
• Injection Moulding: Ensuring dryness of plastic pellets, increasing process efficiency, detecting dryer failures
• Medical Gases: Monitoring dew point in compressed air and gases for patient care, complying with HTM02 standards
• Natural Gas and LNG: Ensuring gas quality, preventing freezing in pipelines, protecting desiccant materials
• Pharmaceuticals: Controlling moisture content for product consistency, shelf life, and chemical reactivity
• Power Generation: Monitoring trace moisture to protect equipment and improve efficiency
• Speciality Gases: Certifying trace moisture content in calibration gases

FAQ (Selection)

• Sampling in hazardous areas is possible using a Zener Barrier or Exd Flameproof Enclosure
• Global network of authorised distributors
• Typical lead time: 1-2 weeks plus delivery
• Measurement logging available via RS485 and Logger Software for Windows
• Compatible with wall or frame-mounted dewpoint sample systems

Characteristics / Technical Specifications

• Model: Model 6020
• Brand: Alpha Moisture Systems
• Sensor Type: Ultra-High Capacitance - Aluminium Oxide
• Dewpoint Range: -110 °C to +20 °C (-166 °F to +68 °F)
• 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
• Storage Temperature: -20 °C to +70 °C
• 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: 2 - 5 L/m (max 20 L/min)
• Power Supply: 90 – 250VAC, 50/60Hz / 18-28VDC
• Display: Red 7-segment 5-digit primary, 7mm secondary
• Alarms: Two single pole changeover contacts, 10A at 240V AC
• Output Signal: Isolated 4 - 20 or 0 - 20 mA Linear
• Serial Communications: RS485, UART, up to 99 addresses, selectable baud rate
• Enclosure: DIN Style, ABS case, IP54 front panel seal
• Weight: 470 g