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Series RF Level Control

Radio Frequency Sensing for Liquids and Solids, Remote High/Low Control

Dimensional Enlargement

Series RF Level Controls employ radio frequency technology to precisely monitor the level of almost any solid or liquid, completely ignoring product build-up. Probe has no moving parts to fail and a fully adjustable time delay avoids false signals. A low frequency FM signal is continuously emitted within the tank from the 316 SS antenna. As the media being monitored nears or covers the probe, a change in capacitance occurs which is sensed by the receiver circuit and converted into on-off switching of a DPDT relay. Each unit is quickly and easily calibrated in the field for the unique dielectric constant characteristics of the specific product being controlled. Simply adjust a trim pot inside the control head until a bright red LED confirms that the system is calibrated and ready for operation. Once set, these units will operate for years, unaffected by material build-up, even with problem materials like latex paint which can quickly disable most mechanical controls. Standard models are designed for top mounting but a special unit with Teflon® sleeve is offered for horizontal mounting. Where greater sensitivity is needed for materials with a 20 or lower dielectric constant, consult factory about special units with 7/8" diameter probe.

A separate control box is typically installed at a convenient location to allow easy changes in wiring, time delay duration, observation of level status, etc. Voltage between control box and probe is only 20 VDC for intrinsically safe operation. A full complement of controls includes four time delay ranges from 0-30 seconds up to 2 hours with separate fine adjust control plus selectable high or low fail-safe operation. Dual probe packages include one each of a 12 and 60" or 24 and 60" unit for high/low control. A latching switch enables you to connect the pair for differential operation. The control box card also includes an LED indicator for each system so you always know circuit status no matter how remote the location. Probes are easily trimmed to shorter lengths where required.

  • RF technology is immune to product build-up
  • Easily adjusted for nearly any solid or liquid in minutes
  • No moving parts in probe for dependability
  • Probe can be any length required - field trimmable
  • Adjustable time delay prevents false signals
  • 20 VDC probe with zener diode protection for safety
Service: Compatible liquids.
  • Wetted Materials:
    Connection: 316SS.
    Probe: 316 SS or Teflon®.
    Insulator: Teflon®.
  • Temperature Limits: Probe: -40 to 250°F (-40 to 121°C); Control Box: -10 to 160°F (-23 to 71°C).
  • Pressure Limit: 100 psig (6.89 bar). Optional 1000 psig (68.9 bar)
Enclosure Probe: Weatherproof and explosion-proof, NEMA 4, 7, 9. Class I, Div. 1 & 2, Groups C & D; Class II, Div. 1 & 2, Groups E, F and G. Control Box: Weatherproof, NEMA 4X.
Switch Type: DPDT form C contact.
  • Electrical Rating: 2A @ 115 VAC.
  • Power Requirement: 110/220 VAC, 50/60 Hz; 220 VAC; 24 VDC.
  • Current Consumption: 5 VA.
  • Electrical Connections: Screw terminal.
  • Conduit Connection: Probe: 3/4" female NPT. Control Box: Pg 16, 21 and 29 punch outs.
  • Process Connection: 3/4" male NPT.
  • Mounting Orientation: 316 SS probe can only be vertically mounted. Teflon® covered probe can be vertically or horizontally mounted.
  • Set Point Adjustment: Trips when product touches the probe. Field trim the probe to desired trip point.
  • Weight: 12" Probe: 3.4 lb (1.54 kg); Control Box: 1.8 lb (0.82 kg).
  • Time Delay: Selectable to: Off, 0 to 30 seconds up to 15 seconds to 2 hours.
  • Options: Probes up to 25 ft (7.62 m), 7/8" diameter probe for materials with a dielectric constant below 20, 1000 psi (68.9 bar) pressure rating.
  Model Number Description
Single Proble RF101 316SS probe, 12" length x 1/4" dia.
RF102 316SS probe, 24 " length x 1/4" dia.
RF105 316SS probe, 60 " length x 1/4" dia.
RF301 Teflon coated probe, 12" length x 1/4" dia.
Control Box RFC1 Single probe control
RFC2 Dual probe control