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KRF Capacitance Level Transmitter
The Model KRF is an advanced, state-of-the-art, two wire, RF Capacitance-based level transmitter suitable for a wide range of process applications. The latest in microprocessor technology allows the Model KRF to consistently and reliably measure the level of your process media. Built-in HART® communications allow for remote calibration and diagnostics. The onboard 2-line by 8-character display and 3-button key are for local display and calibration. A unique magnetic interface (Magnetic Touch) provides a way to actuate the keypad through the window of the explosion proof enclosure, thereby eliminating the need for removing the cover in a hazardous environment. The Model KRF is also intrinsically safe when used with the appropriate barriers.
PRINCIPLE OF OPERATION
The probe in conjuction with the vessel wall and the process media (dielectric) from a capacitor. As the level of the media changes, a corresponding change in the capacitance occurs. The Model KRF Transmitter measures this change, compares it to the calibrated values and calculates the level of the media
In conductive media applications, the probe and the process media are capacitive plates and the insulation (teflon®) on the probe is the dielectric. The capacitance of the probe increases with the level of the liquid
When measuring any media in non-metallic vessels (ex. concrete sumps, plastic tanks, etc...) the second plate of the capacitor must be supplied. KENCO offers a variety of options for this situation.
COMMON APPLICATIONS:
- Oils, Solvents and other hydrocarbons
- Acids & Caustics
- Slurries
- Liquid Interfaces
- Bulk Solids
- Water
- powders
- Cryogenic Fluids
PRODUCT FEATURES:
- Magnetic Touch keypad interface: adjust transmitter in a hazardous environment without removing the enclosure cover
- EZCal calibration: calibrate in one fluid, and use the transmitter in a different fluid
- Only a 2% change in in span is required to calibrate the transmitter
- HART® communications interface
- Powerful, onboard diagnostics
- 2-line x 8 character alphanumeric display and 3-button keypad
- Cryogenic probes: specifically designed for cryogenic fluids
- A wide variety of probes for virtually any application
TRANSMITTER ELECTRICAL DATA:
POWER SUPPLY = 12 - 30Vdc ± 10%; 24Vdc nominal
SUPPLY VOLTAGE EFFECT = Less than 0.01% of span/volt change
AMBIENT TEMPERATURE RANGE = -40°F to 176°F or -40°C to 80°C
HUMIDITY = 100% Condensing
ACCURACY = ±0.1% of span
REPEATABILITY = ±0.05% of span
LINEARITY (SOLID PROBE) = ±0.1% of span
LINEARITY (FLEXIBLE PROBE) = 0.025% of span
RESOLUTION = 0.01mA
RESPONSE TIME = 300 msec
TEMPERATURE EFFECT = ±0.01% of span/°F or 0.018% of span/°C
ERROR INDICATION = 3.6mA, 22mA, or Hold last value; field selectable
RANGE = 15-100,000pF
DAMPING = 0-60 seaconds; field adjustable in 1 sec. increments
MAXIMUM REMOTE DISTANCE = 10 feet between the electronics and the probe
OPERATOR INTERFACE:
Data Entry = 3-button key pad; magnetic touch
Display = 2 line by 8-character LCD
OUTPUT:
Analog = 4-20mA; 3.8-20.5mA overtravel; reversible
Digital = HART® communications protocol
SAFETY APPROVALS: FM APPROVED
Explosion Proof = Division 1; Class I: Groups B,C,D; Class II; Groups E,F,G; Class III
Intrinsically Safe = Division 1; Class I: Groups A,B,C,D; Class II; Groups E,F,G; Class III
Non-Incendive = Division 2; Class I: Groups A,B,C,D; Class II; Groups F,G; Class III
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