Cognesense - Measure, Monitor, Protect

Captrol 514

The Captrol 514 is designed for engineers, plant operators, and OEM system integrators who require dependable multi-point level detection for liquids, slurries, or bulk solids.

The device provides four independent level setpoints, microcontroller-based RF capacitance switching, and programmable relay logic within a rugged, explosion-proof enclosure.

Unlike mechanical float or paddle switches that are susceptible to wear, coating, or false trips, the Captrol 514 uses high-frequency capacitance sensing with a driven-guard probe design and solid-state electronics. This allows it to deliver precise and repeatable level control even in harsh, high-temperature, corrosive, or variable-dielectric applications.

The Captrol 514 consolidates multiple switching functions into a single intelligent instrument. This reduces wiring, installation costs, and maintenance while improving overall operational safety.

It is well suited for applications such as pump control, overfill protection, batch processes, and multi-level alarms.

Captrol 514 RF Capacitance Multi-Point Level Switch

Details

The Captrol 514 is designed for demanding industrial level control applications that require multiple detection points within a single vessel.

Using RF capacitance sensing, the instrument detects changes in dielectric properties rather than mechanical motion. This makes it resistant to buildup, vibration, dust, turbulence, and slurry coatings that often cause issues for mechanical switches.

Each of the four independent setpoints can be digitally calibrated and programmed for alarm, pump control, interlock, or shutdown functions.

Configurable time delay settings help prevent nuisance trips caused by agitation or splashing, while fail-safe logic ensures predictable behavior during power loss or wiring faults.

The device features an explosion-proof aluminum enclosure, high-temperature probe options, and compatibility with both metallic and non-metallic tanks. These capabilities make the Captrol 514 suitable for demanding environments in oil and gas, chemical processing, food production, wastewater treatment, and bulk material handling systems.

By integrating four switching points into one device, the Captrol 514 reduces equipment count, simplifies wiring, and lowers installation costs while providing a safer and more efficient solution for automated tank level management.

Applications

High and Low Level Pump Control: Four programmable setpoints help prevent pump dry-run conditions, tank overflows, and excessive pump cycling.
Slurries, Viscous Liquids, and Coatings: RF capacitance technology resists buildup and coating, ensuring reliable switching compared to mechanical floats or paddles that can wear or stick.
Corrosive or Hazardous Media: Teflon® or Kynar® probe materials combined with explosion-proof housing provide safe and durable operation in aggressive environments.
OEM and Engineered Skids: Four relay outputs in a single device simplify system design and reduce wiring complexity in skid-mounted equipment.

Technical Specifications

Parameter

Description

Technology

RF capacitance with microcontroller-based multi-point switching

Outputs

Four independent SPDT Form C relays

Relay Rating

5 A at 110/220 VAC; 3 A at 24 VDC (non-inductive)

Setpoints

Independently programmable for High, Low, or Off

Power Supply

110/220 VAC at 60 Hz or 24 VDC

Sensitivity

Maximum sensitivity of 0.25 pF

Time Delay

Selectable delay of 0, 5, 10, 15, 20, 25, or 30 seconds

Enclosure

Die-cast aluminum with polyester coating

Enclosure Ratings

NEMA 4, 5, 7, 9, 12

Hazardous Area Ratings

NEC Class I Division II; Class II Division II (Division I pending)

Temperature Range

–40 °C to +73 °C (–40 °F to +165 °F)

Probe Options

Rigid or flexible probes in Teflon®, Kynar®, stainless steel, and sanitary designs

Mounting

NPT or flanged (carbon steel or stainless steel)

Fail-Safe Modes

Field-selectable high or low-level fail-safe

Calibration

Digital calibration with onboard diagnostic LEDs

Certifications

FM certified; CSA and Cenelec approvals pending

2026 COST ESTIMATE

Support

If you have questions not covered here, please contact the Cognesense support team for assistance.

How many level points can the Captrol 514 monitor?

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It supports four independent setpoints, enabling multi-level alarms and pump control in a single device.

Can it handle sticky or viscous materials?

It supports four independent setpoints, enabling multi-level alarms and pump control in a single device.

Is the unit suitable for hazardous environments?

Yes. The CAPTROL 514 features an explosion-proof enclosure and industrial safety approvals for harsh environments.

Can it be used in plastic or non-metallic tanks?

Yes. The CAPTROL 514 features an explosion-proof enclosure and industrial safety approvals for harsh environments.

Does it replace multiple level switches?

⁠Yes. It combines four level points and relay outputs into one instrument, reducing wiring, penetrations, and cost.

How does the Captrol 514 replace four separate level switches?

⁠The CAPTROL 514 integrates the sensing capability and the output control logic for four separate setpoints into a single probe and housing. Each setpoint is programmed independently to actuate one of the four internal SPDT relays, allowing one device to manage critical functions like high-high shutdown, high alarm, pump-on, and pump-off, simplifying wiring and reducing installation costs.

What is the benefit of microcontroller-based setpoint logic?

Microcontroller-based logic provides superior precision and repeatability compared to older analog components. It allows for accurate digital calibration and prevents the setpoints from drifting over time or interacting with each other when adjusted. This ensures that the switching points remain exactly where they were set during commissioning.

Can it be installed remotely from the vessel?

Yes. Remote probe options allow mounting electronics away from heat, vibration, or limited-access locations.

What industries commonly use this device?

Common deployments include oil & gas terminals, chemical plants, food processing, biogas systems, water treatment, and bulk storage facilities.