H2OSCAN ANALYSER
The H2OSCAN On-Belt Moisture Measurement System now allows the accurate measurement of moisture in real-time. This ready availability of moisture information allows proactive process control actions. The information can be used in several ways including:
- Metallurgical/process accounting
- Diverting excessively moist material away from vulnerable downstream processes
- Feedback control to a dryer circuit
- Feed forward/back control to spray bars for dust control
- Product nett weight monitoring for quality control purposes
- Product moisture/dry mass contract compliance, etc., etc.
APPLICATIONS
Suitable for continuous, on-conveyor applications ranging from conventional non-conducting materials to moderately attenuating materials such as iron ore, chrome, minerals concentrates and high moisture coals.
SYSTEM DESCRIPTION
The H20Scan on-belt moisture analyser consists of the following sub-systems:
- Measurement H-bracket:
o Sturdy H bracket securely mount H2OScan over the conveyor by bolting to conveyor structure
- Easily adjusted to fit existing conveyors
- Ensures accurate alignment of the microwave transmitter and receiver subsystems.
- Electronics control cabinet: Mounted on H bracket or separate fixture. Contains electrical, electronic hardware which consists of:
o Processor / PLC
o Power supplies
o Electrical terminations
- Analogue or digital inputs and outputs
- Profibus standard – Modbus/Ethernet etc. available
- Mass flow measurement:
o Usually provided using a belt scale or weigh feeder. H2OScan can interface with this device for the calculation of weight percent moisture. For applications with no measurement device H2OScan can be supplied complete with an integrated belt scale.
Competitive advantages of H2Oscan compared to Near infrared
| | H20SCAN | Near Infrared |
|---|---|---|
| Vertical segregation | Unaffected - beam penetrates full bed of materialUnaffected - beam penetrates full bed of material | Reflectance technique from surface molecules only |
| Sample presentation | Unaffected by position of material | Distance of material surface to receiver important for Infrared |
| Colour | Doesn’t affect H20Scan | Affected by belt material colour changes |
| Ambient lighting | Unaffected | Requires shielding from ambient light |
| Wear | No moving parts | Mechanical filter system |
| Presence of steam | Unaffected | Can cause interference |
| Dirty atmosphere | IP65 enclosures | Infrared lamp window requires cleaning |
Operational requirements
| Conveyor width | Up to 1,400mm as standard (over 1,400 mm requires a customized on-belt frame) |
| Conveyor speed | No limit |
| Material top size | Typically, up to 300mm (material dependent) |
| Bed depth range | Typically, 0mm to 300mm (material dependent) |
| Moisture range | 0 to 80% |
| Measurement update time | Typically, 1 minute (user configurable) |
| Instrument precision | Typically, 0.3% at 1 standard deviation (ultimate precision achievable 0.1 %) |
| Usability | The H20Scan can perform 3 measurements per second (user configurable) |
| Safety | Very low microwave power emitted (under 1 microwatt/cm2 at the antenna) |
Environmental requirements
| Operating temperature range | O to 50°C with protection from direct sun and rain |
| Humidity | 0 to 95% relative (non-condensing) |
Electrical requirements
| Weightometer/ Belt Scale | Standard: 4-20 mA current loop or Digital inputs: Modbus/Profibus/Ethernet etc) |
| Conveyor Status on/off & Speed | Standard: 4-20 mA current loop or Digital inputs: Modbus/Profibus/Ethernet etc) |
| Bulk Density | Optional: Bulk density meter advised where belt loading is not constant |
Outputs
| Instantaneous moisture | 0-10V or 4-20 mA current loop |
| Tonnage weighted moisture | 0-10V or 4-20 mA current loop |
| Moisture Relay closures | High and Low moisture relay closures |
Shipping
| Shipping mass | 30kg |
| Shipping dimensions | 800mm long x 600mm wide x 1,000mm high |