Monitor | Capacitance Probe MK-2 / MK-2e
- TrueCap® RF capacitance sensors offer cost-effective point level monitoring with reliability you can count on. Monitor’s complete line, which features models MK-2 and MK-2e, provides you with the most affordable solution for your application. Monitor’s RF capacitance probes are designed to provide a high level of sensitivity, stability and durability for powder and bulk solids applications, as well as liquid and slurry applications. Monitor’s two-year warranty stands behind every TrueCap sensor..: Principle of Operation .: Applications .: Model Selection
- Principle of Operation
A radio frequency is applied to the probe and is continually analyzed to determine the influence caused by the surrounding environment. As material contacts the probe, the radio frequency shifts indicating an increase in capacitance (C). The active probe of the unit and the vessel’s wall make up the two plates (A=area) of a capacitor which are separated by a fixed distance (d). The probe’s insulator and surrounding air provide the dielectric material (with dielectric constant “K”). As the air (K=1.0) is displaced with any other material (K > 1.0), the capacitance effect (C) is enhanced, thereby changing the application’s impedance. This influence is measured within the circuitry and compared to a reference established by the sensitivity setting. The setting determines how much influence must be present before the output changes. The driven shield section of the probe enables the circuitry to ignore product build-up on the probe that would otherwise cause false sensing. The driven shield is activated with the same radio frequency potential as the sensing probe. Since current can not flow between identical potentials, the driven shield blocks current flow from the active probe to the vessel wall through the material build-up, thereby eliminating the sensing of the material build-up.
Features
- The TrueCap® Model MK-2e RF capacitance point level sensor is a reliable sensor and is a standard for many OEMs and end users requiring versatility and lower cost. Superior 0.5 pF sensitivity ensures reliability
- Build-up immunity helps eliminate false signals
- High intensity LED indicating light (Ordinary location integral sensors only)
- Available hazardous location approvals with intrinsic safety
- Simple 2-step manual calibration
- Economical
TrueCap® RF capacitance point level sensors are versatile devices providing high and low level readings in bins, silos, tanks, hoppers, and other vessels. TrueCap’s superior sensitivity range allows users to properly adjust units to meet the needs of a wide variety of applications. Whether your application is for a powder, liquid, granular solid, or viscous material, the TrueCap product line offers the right solution.
Feed / Grain
Chemicals
Pellets
Plastics
Liquids
Pharmaceuticals
Rubber
Wastewater
Sand
Food Ingredients
Slurries
Cement
Powders
Paint & Coatings
Coal
Granular Solids
Oils
Paper Pulp
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| Specifications | Power: 48-240VAC ±10%, 3VA, 50/60Hz 24-48VDC ±10%, 3W Altitude: 6562ft (2000m) max Installation Category: II Pollution Degree: 4 (reduced to 2 by enclosure) Suitable for indoor/outdoor use Ambient Operating Temp: -40°F (-40°C) to +150°F (65°C) *Internal Bin Temp: To +176° F (+80° C) w/alum. mount (<104° F (40° C) ambient) To +400° F (+204° C) w/SS mount (<122° F (50° C) ambient) Output Relay: DPDT, 5A @ 250VAC, 30VDC maximum Indicators: “DET” yellow LED illuminates when material is sensed “ OPR” red LED illuminates to indicate output switching “ CAL” green LED illuminates to indicate proper calibration “ SEN” bank of four LEDs indicated the sensitivity setting External Indicators: Red and green LEDs indicating power and operating mode (Ordinary location units only) Sensitivity: Switch selectable 0.5pf, 2.6pf, 8.3pf, 18.0pf Stability: ±0.01pf per degree F (±0.018pf per degree C) @ 0.5pf setting Time Delay: 0.25 to 15 sec single-turn adjustable for delay to activate and delay to de-activate Fail-Safe: Switch selectable - HI/LO Build-Up Immunity: Protected via driven shield to 150 ohm load Enclosure: Cast alum screw-on cover, beige polyester powder coat, NEMA 4, IP66 Conduit Connection: Two (2) 3/4” NPT connections (M20 cable glands provided when 1-1/2” BSPT process connection is specified) **Approvals: CSA(US) CSA(C) Ordinary Locations, CE Mark(Ordinary location only) CSA(US) CSA(C): Class I Groups C & D, Exp. Proof & Intrinsically Safe CSA(US) CSA(C): Class II Group E, F & G, Dust Ignition Proof & Intrinsically Safe |
| Dimensions | N/A |
Customer Reviews
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