OMRON 61F-LS-CP11-BTC Level Switch

오므론 61F-LS-CP11-BTC Electrode Type Level Controller (Floatless Level Switch)

1. 모델 코드 분석

61F-LS-CP11-BTC

1. 61에프: OMRON conductive level switch product series
2. 엘에스: Compact plug-in type with floatless electrode detection
3. CP: Socket plug-in base mounting style
4. 11: 11-pin socket terminals (matching base PF113A-E)
5. 비: DC24V power supply type
6. 티: 트랜지스터 출력 (NPN 오픈 컬렉터)
7. 기음: Standard universal version supporting 3 liquid level electrodes
8. 제품개요

This conductive level controller detects liquid level by utilizing liquid conductivity without floats or float cylinders. It adopts DC24V power supply and NPN transistor output compatible with PLC digital inputs. The compact 11-pin pluggable module features adjustable detection sensitivity and response delay. It realizes automatic high/low liquid level control (water replenishment / 배수) for purified water, sewage and weakly conductive chemical liquids.

III. 핵심 전기 사양

1. 핵심 기능
2. Float-Free Conductive Detection

Three metal electrodes distinguish high, low and common liquid levels based on liquid conductivity. The mechanical float-free design eliminates jamming caused by impurities, delivering higher reliability in sewage and chemical wastewater applications.

2. Wide Adjustable Sensitivity Range

Switchable 0.5kΩ~200kΩ gears: low resistance gear for sewage and salt water; high resistance gear for high-purity distilled water and deionized water.

3. Anti-Fluctuation Delay Function

Instant detection or 5-second delay options filter false triggers caused by water ripples and bubbles, an essential function for water tanks and circulating cooling tanks.

4. NPN Transistor Output for PLC Connection

Different from relay contact models, it can be directly wired to PLC DC24V digital input modules without intermediate relays, simplifying control cabinet wiring.

5. Long-Distance Electrode Wiring

0.75mm² 3-core shielded cables for electrodes support wiring up to 4km, ideal for scenarios where water pump rooms are far away from storage tanks.

6. Universal Plug-In Structure

Interchangeable base with AC relay output models of the same series (61F-LS-CP11-NRA). No internal cabinet wiring modification required for maintenance and replacement.

1. Complete Operating Logic (3-Electrode High/Low Level Control)

Electrode layout: 기음 (흔한, permanently submerged), 시간 (High Level), 엘 (Low Level)

1. Water Replenishment Mode (Automatic water feeding when tank water level is low)

Liquid level below L electrode: Electrode circuit disconnected, NPN output turns ON → PLC receives signal and starts the makeup water pump;

Liquid level rises to touch H electrode: Circuit connected, output turns OFF → pump stops water replenishment.

2. 배수 모드 (Automatic draining when tank is full)

Liquid level rises to touch H electrode: Output turns ON, sewage pump starts;

Liquid level drops away from L electrode: Output turns OFF, sewage pump stops.

1. 응용 시나리오
2. 수처리 산업

Automatic pump start/stop control for pure water machines, sewage tanks, water softeners, circulating cooling towers and chemical dosing tanks.

2. Industrial Equipment Supporting

Liquid level monitoring for injection molding machine cooling water tanks, machine tool cutting fluid tanks, air compressor condensate tanks and electroplating chemical tanks.

3. 자동화된 생산 라인

Washing sinks, food soaking tanks and pharmaceutical mixing tanks, realizing interlock liquid level alarms with PLC.

4. Computer Room & Building Water Supply

Underground collecting pits, fire water replenishment tanks and central air conditioning condensate pits, supporting automatic drainage and overflow alarms for high/low liquid levels.

5. Special Scenarios for DC Control Cabinets

Liquid level detection inside robot stations and DC control cabinets with built-in DC24V power systems (no AC220V circuits).

Ⅶ. Comparison of Same Series Models for Model Selection

Ⅷ. 설치 & 배선 요점

1. PF113A-E base must be purchased separately. The pluggable module enables convenient maintenance and replacement.
2. Adopt BF-1/BF-5 conductive electrode rods. Plastic water tanks require an independent common C electrode; metal tanks can connect terminal C to the tank body for grounding as a substitute.
3. Shielded cables are recommended for electrode wiring. Single-end grounding of shielding layers for long-distance wiring eliminates interference-induced false actions.
4. NPN output wiring: Negative common terminal; connect one end of the load to DC24V+, and the other end to the controller OUT terminal.
5. DIP switch operation: Set the sensitivity matching the liquid first, then select delay or instant mode.
6. Usage Restrictions & 문제 해결

Forbidden Application Scenarios

1. Cannot detect non-conductive liquids (pure oil, alcohol, organic solvents); float-type level switches shall be adopted instead.
2. Prohibited for environments with flammable and volatile liquids.
3. Do not short-circuit electrodes, otherwise continuous false triggering will occur.

Troubleshooting Table

Full Application Fields of OMRON 61F-LS-CP11-BTC Level Controller

Core advantages of this model: DC24V power supply, NPN transistor output for direct PLC connection, float-free electrode detection, adjustable sensitivity and anti-fluctuation delay, compatible with all-DC automation control cabinets. It covers seven major industries as below:

1. Industrial Equipment Automation (핵심 애플리케이션)
2. Machine Tool Processing Equipment

Liquid level monitoring for cooling water tanks and cutting fluid pools of CNC lathes, machining centers and grinders. Automatic water replenishment and overflow alarms prevent spindle damage from dry running. The float-free design avoids jamming by iron filings, suitable for oil-contaminated water with impurities.

2. Injection Molding & Die Casting Equipment

Automatic pump start/stop control for high/low liquid levels of injection molding machine cooling towers, mold temperature machine water tanks and die casting machine circulating pools.

3. Washing Machines & Ultrasonic Cleaning Lines

Monitor liquid levels of clean water, dilute acid and alkali cleaning solutions in part washing tanks, degreasing tanks and rinsing tanks, realizing automatic liquid replenishment and residue discharge with PLC.

4. 공기 압축기 & Hydraulic Stations

Automatic drainage for condensate collection boxes of air storage tanks and water accumulation chambers of hydraulic oil tanks to prevent water vapor from entering pneumatic and hydraulic systems.

5. Robot Workstations

Liquid level detection for robot supporting cooling water tanks and cleaning station sinks. The whole machine adopts DC24V power supply without AC circuits, with NPN output directly connected to robot PLC.

1. 수처리 & 환경 보호 산업
2. Pure Water & Water Purification Equipment

High-sensitivity gear fits low-conductivity distilled water and deionized water in reverse osmosis pure water machines, water softeners and EDI ultrapure water tanks.

2. Sewage & 폐수 처리

Liquid level control for regulating tanks, sedimentation tanks and dosing tanks (dilute acid, dilute alkali, salt water). Supports 4km long-distance electrode detection for remote pump room tanks and automatic sewage pump operation.

3. Circulating Cooling Water Systems

High/low liquid level interlock water replenishment and overflow protection for factory cooling towers and central air conditioning cooling water tanks.

4. Rainwater Collection & Reclaimed Water Reuse Systems

Liquid level monitoring for underground collecting tanks and storage tanks, realizing automatic water supply and low-level alarms with PLC.

III. 공조 & 건축 장비

1. Central Air Conditioning Condensate Trays & Pits

Detect accumulated water at the bottom of units and automatically start drainage pumps when full to avoid ceiling water leakage and equipment damage.

2. Heating Boiler Makeup Water Tanks

Automatic water replenishment for auxiliary tanks of hot water boilers and waste heat recovery boilers, with safety interlock shutdown at low liquid level to protect boilers.

3. Precision Computer Room Air Conditioners

Condensate collection tanks for data and server room air conditioners, compatible with full-DC control cabinets to eliminate overflow risks for servers.

1. 음식 & Beverage Processing Industry
2. Cleaning Tanks & Alkaline Washing Tanks

Stable liquid level control for cleaning pools of food containers and material baskets.

2. Batching & Soaking Process Storage Tanks

High/low liquid level monitoring for sugar water, salt water and seasoning liquid tanks, with automatic liquid replenishment coordinated by PLC to ensure continuous production.

3. Automatic Car Washing Production Lines

Liquid level control for car washer clean water tanks and chemical agent storage tanks, supporting automatic water replenishment and liquid shortage alarms.

1. 화학적인 & Electroplating Industry
2. Electroplating Production Line Chemical Tanks

Adjustable sensitivity adapts to conductive dilute acid and alkali solutions in galvanizing and nickel plating tanks; float-free design prevents impurities in plating layers.

2. Small Chemical Mixing Tanks

Liquid level detection for water-soluble additives and diluent storage tanks with long-distance remote electrode wiring control.

> Limitation: Not applicable to pure organic solvents and highly corrosive concentrated acid/alkali (special anti-corrosion electrodes required).

1. 새로운 에너지, 태양광 & Energy Storage Industry
2. Photovoltaic Power Station Water Treatment Systems

Cleaning water storage tanks for photovoltaic panels, powered by DC24V storage batteries for remote sites without mains power.

2. Energy Storage Cabinet Cooling Water Tanks

Water cooling circulation tanks for lithium battery energy storage equipment, with full DC power supply and PLC liquid level protection to trigger shutdown at low water level.

3. Hydrogen Energy & Waste Heat Recovery Equipment

Automatic liquid level control for waste heat boiler makeup tanks and cooling circulating water.

Ⅶ. 도시공학, Computer Rooms & Construction Machinery Supporting

1. Underground Pump Rooms & Fire Protection Facilities

Overflow alarms and automatic drainage for underground fire collecting pits and fire water replenishment tanks, compatible with DC24V fire control systems.

2. On-Board Construction Machinery Equipment

Liquid level detection for clean water and sewage tanks of sanitation vehicles and road sweepers, directly driven by vehicle-mounted 24V DC power supply.

3. Laboratory Pure Water Equipment

High-sensitivity mode accurately detects low-conductivity distilled water and deionized water in laboratory storage tanks.

선택의 장점 (Reasons for Prioritizing BTC Model in Above Fields)

1. DC24V power supply: Dedicated to robot, 에너지 저장, computer room and vehicle-mounted equipment without AC220V circuits;
2. NPN transistor output: Direct connection to PLC digital inputs, eliminating intermediate relays and simplifying cabinet wiring;
3. Float-free electrode design: No jamming in sewage, iron filings and chemical liquid environments with far lower failure rate than float switches;
4. Wide 0.5kΩ~200kΩ sensitivity range: Fully compatible with pure water, sewage, salt water and dilute acid/alkali liquids;
5. 5s anti-fluctuation delay: Prevents false pump start/stop caused by bubbles and liquid surface vibration in tanks;
6. 4km long-distance electrode wiring: Suitable for remote control scenarios where pump rooms are separated from water tanks.

Unsuitable Application Fields

1. Non-conductive media: Engine oil, diesel oil, pure alcohol, organic solvents;
2. Storage tanks containing flammable and volatile liquids;
3. Working conditions with concentrated strong acid/alkali without anti-corrosion electrodes.