Level Control- Series RF
Radio frequency sensing for liquids and solids. Remote high/low control; 2 Amp rated relay.
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.
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
General
- Temperature Limits: -40 to 250°F (-40 to 121°C)
- Maximum Pressure: 100 psig (6.89 bar). Optional 1000 psig (68.9 bar)
Wetted Parts:
- 316 stainless steel, Teflon
- Probe Enclosure: NEMA 4 & 7. Explosion-proof; Class 1, Divs. 1 & 2,
- Groups B, C & D. Class ll, Divs. 1 & 2, Groups E, F & G
- Control Box Enclosure: NEMA 4X, PVC with polycarbonate cover.
Electrical
- Power Supply: 110/120 VAC std., user selectable for 220 VAC or 24 VDC
- Power Consumption: Approximately 5 VA
- Switch Contacts, Rating: DPDT form C contacts, 2.0 A@ 115 VAC
- Time Delay: On or off delay, four ranges adjustable from 0 to 30 seconds, 1 sec. to 2 min., 2 sec. to 16 min. or 15 sec. to 2 hours.
- Connecting Cable, Probe to Control Box: 18 AWG, 3-wire shielded or in metal conduit, to 1000 feet.
Mechanical
- Process Connection: 3/4" NPT. Install in 3/4" NPT half coupling.
- Weight, Probe Assembly: 3.4 lbs., (1.54 kg.)
- Weight, Control Box: 1.8 lbs. (0.82 kg.)
| Model Number | Probe Length | Probe Dia.,In. (MM) | Probe Coating | Control Box |
|---|---|---|---|---|
| RF1-01-00-1 | 12" | 1/4" (6.4) | none | single |
| RF1-02-00-1 | 24" | 1/4" (6.4) | none | single |
| RF1-01-05-1 | 12",60" | 1/4" (6.4) | none | double |
| RF1-02-05-2 | 24",60" | 1/4" (6.4) | none | double |
| RF1T-01-00-1 | 12" | 3/8" (9.6) | Teflon | single |
Note: 60 inch probes are shipped with fixed 24" length antenna threaded
on the end and a separate 36" extension with coupling.
Options - Consult factory for 7/8"dia. probe which provides greater sensitivity
when controlling materials with dielectric constants under 20. High
pressure option available rated at 1000 psig (68.9 bar)
Accessory
No. A-630, 4"x 3/4"NPT,125 Ib. cast iron flange for mounting RF probe.
SUGGESTED SPECIFICATIONS
Level control/alarm system shall be provided consisting of remote radio frequency probe(s) with separate control box. Top mounted probe(s) shall be (12)(24)(60) inch length. Probe(s) and 3/4" NPT process connection shall be constructed from 316 SS. Probe shall be powered by 20 VDC with zener diode protection for safety. Control box shall have selectable power supply for 110 or 220 VAC, 24 VDC and include time delay, selectable from 1 second to 2 hours. Load relays shall provide DPDT contacts rated 2A @ 115 VAC. Level control shall be Proximity Controls Model RF1(T)-__-__-_.