Magnesonics Level Equipment 

 

Magne-Sonics 200DSN3600

RF Capacitance Single Point Level Switch
 

The Model 20ODSN3600 RF Capacitance single-point level switch may be used in conductive and non-conductive liquids, granular materials. foams, pastes and slurries. This low cost device features high quality construction and is ideal for most tip-sensitive switch applications.  Dimensional Information

This model utilizes an integral level sensing probe and special shield driver circuitry to ignore the effects of conductive material buildup on the probe surface. The driven shield portion of the probe is maintained at the same voltage and frequency as its active section, blocking short circuit current from flowing to ground through a conductive coating. Other standard features include adjustable relay time delay to prevent chattering in turbulent applications and field selectable low or high level fail­safe modes of operation. An LED on the control panel indicates that material has reached the level switch point. This ensures easy setup and indicates relay operation.

The switch electronics are housed in a cast aluminum weather­proof and explosion proof enclosure. With a probe rating of 1000 psig at 68° F and 316SST/PFA Teflon wetted materials, the switch may be used in a wide variety of process applications.

  • Driven Shield for Coating Rejection
  • Conductive & Non-Conductive Liquids
  • Explosion Proof Enclosure
  • Time Delay Relay
  • Economical Design
  • CSA Available
 
Operational Specifications:
  • Measurement ................ RF Capacitance
  • Setpoint Range ............. 0.1 to 100pF
  • Temperature Range ...... -40 to 160° F electronics; Wetside -40 to 450° F
  • Protection...................... RFI. EMI, and designed to pass IEC-801-2 static discharge test
  • Spark Protection ........... 100 amps
  • Power Requirements ..... 120 VAC++101'0; 50-60 Hz
  • Relay Function:
  • Output ................... Qty (1) DPDT Form C | 5A Resistive @ 115/230VAC | 5A Resistive @ 30 VDC
  • Time Delay ........... Adjustable 0-30 seconds, field­selectable to delay on pull-in, drop out, or both directions
  • Fail-Safe ............... Field Selectable Low or High
 
Performance Specifications:
  • Sensitivity ..................... 0.1pF
  • Stability ....................... 0.01pF per 24 hrs
  • Temperature Drift ......... 0.01pF per °F
  • Repeatability ................. 0.1 pF
  • Response Time ............. 100 milliseconds minimum
 
Mechanical Specifications:
  • Enclosure ...................... Cast aluminum. urethane finish NEMA 4.7 and 9 Cl. I. Div. 1 Grp. C&D
  • Sensor Wetted Materials ... 316 SST and PFA Teflon
  • Connection .................... 3/4" NPT
  • Net Weight ................... 4.5 lbs. (2.0 kg) approximately
 
Model Selection Guide:
Code Electronics
20 Only Available in Model 200DSN3600  
  Code Electronic Options
  0 115 VAC Powered        
  2 230 VAC Powered        
  4 24 VDC Powered        
    Code Probes
    D Driven Shield      
      Code Wetted Material
      S 316 Stainless Steel    
        Code Insulation Material
        N Not Available  
          Code Probe Length
          36 36" Standard - Probe may be cut to length
            Code Mounting
            00 3/4" NPT Standard
               
20 0 D S N 36 00 Typical Model Number
 

For applications involving conductive material, the level control point (set point) is located at the level probe tip. For vertically-mounted or downward angle mounted probes, a length of the active element may be cut off to adjust the level control point. The remaining active length must be at least 1 inch longer than the Driven Shield.

For applications involving non-conductive material, the dielectric constant of the material and the placement of the level probe will affect the level control switch point. It is not recommended to cut the active element for non-conductive materials without careful analysis of the application.

The graph below can be used as a guide to determine the minimum amount of coverage on the active clement for reliable switching operation in non­conductive materials. The graph illustrates recommended amounts of pro­cess media (in inches) for probes mounted I inch (lower curve) and 12 inches (upper curve) from a conductive, grounded vessel wall.

 
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