Detects both high and low levels using a single probe and controller—ideal for pump control and overfill prevention.
Provides accurate, stable measurement through coatings, dust, or foam while rejecting electrical noise.
Each setpoint is individually adjustable—changing one does not affect the other, simplifying setup.
User-configurable for high or low-level fail-safe operation, ensuring predictable behavior in power-loss conditions.
Durable, weather-tight, and certified for hazardous areas including Class I & II Div 1 locations.
Fine-tune detection for challenging materials such as foam, viscous liquids, or light powders.
Reduces spares and supports global plant standardization.
Bright, at-a-glance confirmation of level status and relay activation for easy field diagnostics.
Available with rigid or flexible probes in Teflon®, Kynar®, or stainless steel, and optional 3A sanitary fittings, the Captrol 510 adapts easily to chemical, food, wastewater, and industrial process installations—making it the ideal solution where both measurement and control are required.
| Parameter | Description |
|---|---|
|
Technology |
RF capacitance with solid-state electronics and dual adjustable setpoints |
|
Excitation Frequency |
2 MHz |
|
Output Relays |
Two independent Form C (DPDT) relays; 5 A @110 VAC, 2.5 A @220 VAC, 3 A @24 VDC (non-inductive) |
|
Power Supply
|
115 VAC (100–130 V), 230 VAC (200–260 V), or 24 VDC (18–28 V) |
|
Power Consumption |
≤ 3 VA |
|
Sensitivity
|
0.5 pF or less |
|
Response Time |
100 ms standard; adjustable up to 30 seconds |
|
Fail-Safe Mode |
Selectable High or Low (relay de-energized on power loss) |
|
Temperature Limits (Electronics) |
–40 °F to +160 °F (–40 °C to +71 °C) |
|
Temperature Limits (Probes) |
Up to +450 °F (+232 °C) with lagging extension |
|
Enclosure |
Die-cast aluminum with polyester coating; NEMA 4, 5, 7, 9, 12 |
|
Approvals |
CSA: Class I, Groups C & D; Class II, Groups E, F, G; Cenelec EEx d IIC T6 (pending) |
|
Mounting Options |
¾″ NPT, 3A sanitary, or flanged (carbon steel or stainless steel) |
|
Probe Styles |
Rigid (up to 20″) or flexible cable (up to 250 ft / 76.2 m); Teflon®, Kynar®, or stainless steel |
|
Indicators |
Yellow LED: Relay energized; Red LED: Level above high setpoint |
|
Calibration Controls |
Multi-turn potentiometers for Setpoint and Differential; DIP switches for range and fail-safe selection |
|
Installation Notes |
Probe should be grounded to vessel wall; dual or concentric probe required for non-metallic tanks |
Have a look at the flyer to get all the tech specs and product features.
Brochure
Read the manual for detailed information and instructions.
Manual
Check out a sample cert from our calibration lab.
Certificate
If you have a question that we have not covered then just get in touch and we’ll be happy to help.
We have tried to answer the most common questions we are asked here.
It combines two independent level setpoints in a single device, providing both high and low-level control with non-interacting calibration—perfect for pump-up/pump-down or dual alarm applications.
Yes. The RF capacitance design and driven-guard probe allow accurate detection even in dusty, foamy, or low-dielectric media.
Absolutely. The Captrol 510 is rated NEMA 7/9 explosion-proof and approved for Class I & II Div 1 service.
Each setpoint uses a multi-turn potentiometer for precise adjustment, with separate controls that don’t affect each other.
In older dual-point switches, adjusting the high-level setpoint could inadvertently affect the low-level setpoint, leading to unstable operation and repeated service calls. The Captrol 510‘s non-interacting controls ensure that each setpoint and differential can be precisely adjusted independently, guaranteeing stable, simple, and accurate field setup.
A fail-safe mode can be selected to de-energize relays in either high or low-level conditions, maintaining a predictable, safe state.
Yes. The Captrol 510’s dual-point design uses a single probe to measure both levels—reducing penetrations, wiring, and installation cost. It is ideal for efficient pump-up/pump-down control or integrated alarm functions.
The Captrol 510 is designed with a single probe that feeds the capacitance signal to two separate, independent electronic circuits within the controller. Each circuit has its own set of potentiometers to define a Set-point (where it switches) and Differential (hysteresis), allowing one circuit to manage the low level and the other to manage the high level, all using the same signal.
It’s widely used in chemical plants, food and beverage processing, wastewater systems, and bulk solids storage where dependable dual-level control and safety monitoring are critical.
Yes. The switch’s high-frequency (2MHz) RF signal and advanced driven guard probe design are highly effective at electronically ignoring conductive buildup or coating on the probe. This allows the switch to maintain accurate detection of the bulk product level, reducing false trips and eliminating the need for frequent cleaning.