Process engineers, plant safety workers, and operators need a dependable, low-maintenance level switch for liquids, powders, or bulk solids. For them, the Captrol 500 provides microcontroller-based RF capacitance switching with one-touch calibration, fail-safe operation, and universal power compatibility.
Unlike competitive point level switches that require tools or manual trim-pot calibration, the Captrol 500 features Auto-Cal one-button setup, built-in self-diagnostics, and a driven-guard probe design that eliminates false trips due to coating or buildup—making it one of the most reliable and easiest-to-use level switches available.
No tools or meters needed—just press to calibrate. Reduces setup time by up to 80%.
Provides accurate, drift-free switching with superior noise immunity and long-term stability.
Prevents false trips due to coating, condensation, or conductive buildup on the probe.
Works across global facilities—reduces spare parts and simplifies installation.
Field-selectable configuration ensures a predictable, safe relay state during power loss or fault.
Customizable for challenging materials like foams, slurries, and low-dielectric powders.
Certified for hazardous locations and engineered for chemical, petrochemical, and food applications.
Green for probe activity, red for relay energized—offering instant visual confirmation of operation and fault conditions.
| Parameter | Specification |
|---|---|
|
Technology |
Microcontroller-based RF capacitance point level switch |
|
Mounting Options |
Integral or remote (up to 50 ft cable) |
|
Power Supply |
115 VAC (95–135 V), 230 VAC (180–270 V), or 24 VDC (18–28 V) |
|
Power Consumption
|
< 3 VA |
|
Output |
SPDT or DPDT relay, 5 A @115/230 VAC or 3 A @26 VDC (non-inductive) |
|
Frequency
|
50–60 Hz |
|
Sensitivity Range
|
Adjustable from 0.5 pF to 10 pF |
|
Response Time |
Adjustable 0.1–30 seconds |
|
Fail-Safe Mode |
Field-selectable for High or Low level |
|
Temperature Limits (Electronics) |
–40 °F to +160 °F (–40 °C to +71 °C) |
|
Temperature Limits (Probes) |
–40 °F to +450 °F (–40 °C to +232 °C), depending on model |
|
Pressure Limits |
Standard probes up to 500 psi (3.4 MPa); Teflon® probes up to 400 psi (2.8 MPa) |
|
Indicators |
Green LED: probe capacitance above setpoint; Red LED: relay energized |
|
Housing |
Cast aluminum, explosion-proof, NEMA 4, 5, 7, 8, 12 |
|
Hazardous Area Ratings |
NEC Class I, Groups C & D; Class II, Groups E, F, G |
|
Probe Styles |
GIMF (Fortron®), GIMN (Noryl®), GT/GTH (Teflon®), GC (Ceramic), GFC (Flexible cable), GAR (Abrasion-resistant SS) |
|
Accessories |
Sensitivity sleeves, flange adapters, 90° bends, lagging extensions |
|
Calibration |
One-touch Auto-Cal pushbutton—no tools required |
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 uses a microcontroller-based RF capacitance design with one-touch Auto-Cal calibration, eliminating manual tuning and ensuring drift-free, maintenance-free performance.
The Auto-Cal feature drastically simplifies setup by automatically setting the correct trip point for the current material conditions. Technicians only need to press a button to calibrate the switch—eliminating the tedious, error-prone process of manually adjusting multiple trim pots with meters and tools.
Yes. The driven guard probe design prevents false trips caused by buildup or conductive coating, even in viscous or adhesive media.
Absolutely. The Captrol 500 is explosion-proof and rated for Class I & II hazardous locations (NEC Groups C, D, E, F, G).
Just press the Auto-Cal button—no tools or meters required. Calibration takes seconds and is automatically stored by the microcontroller.
The switch accepts 115/230 VAC or 24 VDC power, simplifying plant standardization and inventory.
Choose from a wide range of Teflon®, ceramic, stainless steel, Noryl®, or flexible cable probes for any process or temperature condition.
In capacitance switches, conductive buildup (like sticky liquids) on the probe can look like the actual product, causing false alarms. The driven guard is an insulated sleeve around the probe’s center rod that electronically shields the sensing element from this buildup, ensuring only the true presence of bulk product triggers the switch.