Omron 61F-LS-CP11-NRA — Floatless Level Controller
SKU: 61F-LS-CP11-NRAUSD 27.00
Compact floatless level controller for conductive liquids, AC 100-240 V supply, 5 A SPDT relay output, three-electrode operation.
1-Year Warranty
Full manufacturer warranty
Global Shipping
Worldwide delivery available
Genuine Omron
100% authentic product
Ready to Ship
Usually ships within 24h
In Stock
This item is available for immediate shipment from our warehouse.
Contact for pricing, bulk discounts, and shipping
Product Overview
The Omron 61F-LS-CP11-NRA is a compact floatless level controller in the 61F-LS series. It monitors liquid level by reading the resistance between stainless-steel electrodes suspended in the tank. When the conductive liquid touches or leaves a probe, the controller switches its 5 A SPDT output relay. There are no moving parts inside the tank, so the controller suits wells, sumps, water-treatment tanks, and boiler-feed systems where mechanical floats would corrode, stick, or collect debris.
The -NRA suffix on the model code decodes as: N = general-purpose controller body (the standard fitment for the 61F-LS compact series), R = relay output, A = AC 100-240 V universal supply. The CP11 portion of the code marks this as the compact-insertion type with 11-pin socket mounting — the smallest of the three 61F-LS body styles.
Unlike the older plug-in 8-pin 61F-G3 (which is a separate relay-on-rail unit), the 61F-LS-CP11-NRA is panel-mounted via an 11-pin round socket and accepts the full set of 61F electrodes. The probe voltage the controller applies to the electrodes is a low 5 V, which avoids any ground-loop or electrolytic corrosion issue on the probe tips and keeps the install safe on potable-water and deionized rinse loops.
Where it fits
Standard applications are water-tank empty/fill control, sump auto-start/stop for a submersible pump, high- and low-level alarm generation, and upper-and-lower level detection in storage tanks. With the G-grade sensitivity (a separate model), the controller can read high-purity water and steam condensate where the plain model would ignore the low conductivity.
What to pair with it
The 61F-LS-CP11-NRA ships as the controller only. Order the electrode holder (PS-31 or F03-05 series for two- or three-probe configurations), the stainless-steel probes or weighted-cable electrodes (F03-14), and the 11-pin panel-mount socket (PF or PA-style). The wire run between the controller and the electrodes should be short and shielded on high-impedance probes to avoid false triggering from induced mains hum.
Before ordering
Confirm the liquid is conductive at about 100 µS / cm or higher — ordinary tap water, condensate, and most industrial process liquids qualify, but oil, fuel, and deionized water below that threshold will not be seen by the electrodes. For those non-conductive media, switch to a float switch, a capacitive proximity sensor, or an ultrasonic level meter. Plan the electrode wiring with at least 30 cm between probe tips so the controller can tell the levels apart cleanly.
Key Features
- 61F-LS-series compact floatless level controller for conductive liquids
- Three-electrode operation for upper / lower / ground level detection
- Probe voltage 5 VAC for safe, low-corrosion operation
- AC 100-240 V universal supply, 50 / 60 Hz
- 5 A SPDT contact output for direct load or contactor switching
- Adjustable sensitivity up to 100 kΩ electrode resistance
- Compact panel-mount body on an 11-pin round socket
- Operating temperature -10 to +70 degC
- CE compliant, suitable for industrial panel mounting
- SKU: 61F-LS-CP11-NRA
- Series: 61F-LS (compact floatless conductive level controller)
- Voltage: 100-240 V
- I/O: 5 I/O
Best-Fit Applications
- Empty / fill control loop on an industrial water storage tank
- Pump auto-start at low level and auto-stop at high level in a sump
- Upper and lower level detection in a cooling-tower basin
- High-purity rinse tank level control where mechanical floats would shed particles
- Steam-condensate level alarming on a boiler feed receiver
- Sequencing of dual pumps based on tank level states
Buying Checklist
- Choose the 61F-LS-CP11-NRA for AC 100-240 V mains supply and 5 A relay output in the compact body.
- Choose the 61F-LS-CP11-NRD for the same body with DC 24 V supply instead.
- Choose the 61F-LS-CP11-NRA for AC mains; choose the NRAJ or NRAL if you specifically need S or L sensitivity grade.
- Order the 11-pin socket, the electrode holder, and the probes separately — the controller ships alone.
- Confirm the liquid conductivity at the install before ordering — oils, fuels, and deionized water are not readable by this style of electrode.
- Keep the electrode cable run short and shielded on high-impedance probes to prevent false triggers from induced mains hum.
Technical Specifications
| Series | 61F-LS (compact floatless conductive level controller) |
|---|---|
| Supply Voltage | AC 100-240 V, 50 / 60 Hz |
| Probe Voltage | 5 VAC applied to the electrodes |
| Sensitivity | Adjustable up to 100 kΩ electrode resistance |
| Number of Probes | 3 (upper, lower, ground) |
| Control Output | SPDT relay, 5 A at 250 VAC / 30 VDC |
| Response Time | Approx. 80 ms |
| Liquid Conductivity | ≥ 100 µS / cm |
| Connection | 11-pin round socket, panel mount |
| Operating Temperature | -10 to +70 degC |
| Protection Rating | IP20 (panel dependent) |
Resources & Downloads
FAQ for 61F-LS-CP11-NRA
What is the difference between 61F-LS-CP11-NRA and the older 61F-G3?
Both are Omron floatless level controllers in the 61F family, but they differ in form factor and supply. The 61F-G3 is the larger plug-in 8-pin octal-base unit, used with an external octal socket on DIN rail or surface mount, and is typically sold with a specific sensitivity grade (G3 high sensitivity). The 61F-LS-CP11-NRA is the smaller compact panel-mount body on an 11-pin round socket, with AC 100-240 V supply and 5 A SPDT output. Pick the G3 if you want a sensitivity grade or DIN-rail plug-in format; pick the CP11-NRA for compact panel mount and AC universal supply.
What does the model code -NRA mean?
On this 61F-LS-CP11 family: N = general-purpose controller body; R = relay output (instead of transistor); A = AC 100-240 V supply. So the NRA variant is the AC-supply relay-output version of the CP11 family. Other suffixes in the same family include -NRD for DC 24 V supply and -NRAJ / -NRAL for different sensitivity grades.
Can this controller work with non-conductive liquids?
No. The 61F-LS-CP11-NRA works only with conductive liquids at about 100 µS / cm or higher (tap water, wastewater, condensate, dilute acids and bases). For oil, fuel, solvents, or deionized water below the threshold, switch to a mechanical float switch, a capacitive proximity sensor, or an ultrasonic level meter.
Are the electrodes included?
No. The 61F-LS-CP11-NRA ships as the controller unit only. Buy the electrode holder (PS-31 or F03-05 style for two or three probes) and the stainless-steel or weighted-cable probes (F03-14) separately. The matching 11-pin socket for panel mounting is also ordered separately. Plan to bundle these with the controller at order time to avoid a second shipment.
Similar Products
Explore related Omron models often viewed alongside this product.
