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Series
RF Level Control |
| Radio
Frequency Sensing for Liquids and Solids, Remote High/Low
Control |
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Dimensional Enlargement
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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. |
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| ADVANTAGES |
- 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
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| Service: Compatible
liquids. |
| PHYSICAL DATA |
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| General |
- 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)
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| Ratings |
| 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. |
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| Switch Type: DPDT
form C contact. |
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| Electrical |
- 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.
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- 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.
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| STOCKED MODELS |
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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 |
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