Microwave Solids Flow Monitors
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Manufacturer: Monitortech(USA)
Model: SFD-2 & SFI Series
Monitor's line of microwave solids flow monitors are high quality, industrial grade instruments capable of providing a signal indicating the flow/no-flow condition of solids and powders in gravity chutes, feeders and pneumatic pipelines. The Model SFD-2 Solids Flow Detector provides relay outputs that can be setup to indicate changes in the target flow stream (on/off). The Model SFI Solids Flow Indicator provides an analog output which varies with changing conditions of the material flow stream. These non-contact monitors contain no moving parts or probes that can wear out or break off in the material flow, thus ensuring process integrity.
The SFD-2 and SFI use low power microwaves to sense motion within the chute or pipeline being monitored. Microwaves are virtually unaffected by ambient noise and light, heat, humidity, pressure, vacuum, high or low temperatures or dust. This provides maximum effectiveness in typical industrial application environments. These advantages over sonic or mechanical flow monitors make microwave technology the best choice for solids flow monitoring.
Features
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TRANSCEIVER (SENSOR)
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Powder coated NEMA 4 cast aluminum construction
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Approved for Class II hazardous areas
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Meets applicable FCC regulations
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Screw-on/off cover
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Teflon® process seal is standard
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15-30VDC/Analog three-wire input/output (SFI only)
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CIRCUIT BOARD (SFD-2 ONLY)
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Connects to transceiver using an inexpensive, low voltage 3-wire system
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Convenient control functions for time delay, sensitivity and fail-safe selection
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Control function changes can be made without accessing the transceiver
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Yellow and Red LEDs indicate material flow intensity and output activation
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Technical Data:
| TRANSCEIVER (SENSOR) |
| Power Requirement: |
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SFD-2: |
Provided by power supply/conditioning PCB |
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SFI: |
15-30VDC, 100mA max. |
| Enclosure: |
Die-cast aluminum, beige polyester powder coated |
| Enclosure Protection: |
NEMA 4, IP66 |
| Ambient Operating Temperature: |
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SFD-2: |
-40° to +185° F (-40° to +85° C) |
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SFI: |
-13° to +185û F (-25û to +85û C) |
| Process Temp. Max: |
250°F (121°C) if ambient air temp. below 150°F (65°C) |
| Process Seals: |
TFE Teflon®, Ryton® |
| Pressure Ratings: |
TFE Teflon® (75 PSI intm), Ryton® (300 PSI) |
| Process Connection: |
1 1/4" NPT (1-1/2” w/ SS Adapter) |
| Conduit Connection: |
(2) 1/2" NPT |
| Detection Range: |
0 to 10' free air, env. and target dependent |
| Sensitivity: |
Switch selectable HI/LOW |
| Minimum Velocity: |
2.5 ft/sec (762mm/sec) |
| Output: |
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SFD-2: |
None, signal from transceiver is delivered to and processed by power supply/conditioning circuit board |
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SFI: |
4-20mA output typical (full span may not be achieved; actual span is application dependent) |
| Isolation (SFI Only): |
750 VPK isolation between sensor ground and user power supply/analog supply |
| Indicators: |
Green LED – power; Yellow LED Ðloop, intensifies with disturbance detected |
| Emission: |
24.125 GHz, FCC & IC certified, energy levels less than 1mW/cm(2) (OSHA limit at 10mW/cm(2)) |
| Approvals: |
CSA(us/c), Class II Div. 1 & 2 Groups E, F & G
CE Mark (Ordinary Location) |
| POWER SUPPLY/ CONDITIONER BOARD (SFD-2 ONLY) |
| Enclosure (if supplied): |
PBT/Polycarbonate |
| Enclosure Protection: |
NEMA 4X, IP66 |
| Ambient Operating Temperature: |
-40°F to 158°F (-40°C to 70°C) |
| Interconnection Distance: |
2500ft max (minimum wire size 22 AWG) |
| Power: |
Universal 100-240 VAC, + 10%, 50/60 HZ |
| Power Consumption: |
5 VA max |
| Output: |
DPDT dry contact, 5A @ 240VAC, 30 VDC |
| External lights (if applicable): |
Solid state LED clusters
Yellow – material sense; Red – output operate |
| Sensitivity Adjustment: |
Single-turn adjust 0 to 100% of sensor range |
| Time Delay: |
Hold-off, single-turn adjustment, 0.25 to 15 sec.
Hold-on, single-turn adjustment, 0.25 to 15 sec. |
| Fail-Safe: |
Switch selectable, (Flow/No-Flow) |
| Indicators: |
Green LED - power; Yellow LED - sense; Red LED - output |
| Approvals: |
CSA(us/c), ordinary locations, industrial control equipment
CE Mark (ordinary locations) |
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