Omron 61F-G3 AC100-220V — Floatless Level Controller
SKU: 61F-G3 AC100-220VUSD 90.00
Floatless level controller for conductive liquids. AC 100-220 V supply, 5 A SPDT contact, high-sensitivity G3 variant.
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Product Overview
The Omron 61F-G3 AC100-220V is a floatless level controller for water and other conductive liquids. It reads the resistance between stainless-steel electrodes suspended in the tank and switches its output relay when the liquid touches or leaves a probe. There are no moving parts in the tank, so the controller suits water treatment, sump monitoring, and high-purity rinse systems where mechanical floats would corrode or collect debris. The unit plugs into an 8-pin octal base, which makes it quick to swap out during service.
What the G3 suffix means
The 61F series comes in four sensitivity grades: G (standard), G1, G2, and G3 (high sensitivity). G3 is the right pick for high-purity water, steam condensate, and other low-conductivity liquids that the standard G model would ignore. For ordinary tap water or wastewater, the G or G2 version is enough.
Choosing the electrodes and base
The 61F-G3 is the controller only. Order a separate electrode holder (PS series, F03-01, or F03-05 style) and the 8-pin surface- or DIN-rail-mounting socket. Two- or three-electrode configurations cover most empty / fill and upper / lower level jobs. Long cable runs between the electrodes and the controller can pick up noise, so keep the cable short and shielded for high-impedance probes.
Before ordering
Confirm the liquid is conductive (≥ 100 µS / cm). The controller will not see oil, deionized water below the rated conductivity, or dry chemicals. Pick the G3 sensitivity if the liquid is high-purity water or steam condensate. Make sure the supply voltage matches the 100-220 VAC range and the socket wiring is correct. Test the installation in air and again with water before relying on the relay.
Key Features
- Floatless conductive-electrode level control
- High-sensitivity G3 grade for low-conductivity liquids
- Plug-in 8-pin octal base for fast swap-out
- 5 A SPDT contact for direct load switching
- AC 100-220 V supply (50 / 60 Hz)
- Works with PS- and F03-series electrode holders
- Suitable for empty / fill and upper / lower level control
- SKU: 61F-G3 AC100-220V
- Series: 61F
- Voltage: 100-220 V
- I/O: 5 I/O
Best-Fit Applications
- Fill or drain control loops in industrial water-treatment tanks
- Sump and reservoir level monitoring in plant utility rooms
- High-purity water level control in semiconductor rinse systems
- Steam-condensate level detection in boiler feed or condensate tanks
- Cooling-tower and storage-tank upper and lower level control
Buying Checklist
- Choose 61F-G3 for high-purity water, steam condensate, or other low-conductivity liquids.
- Choose 61F-G or 61F-G2 for ordinary tap water or wastewater instead.
- Choose an 8-pin octal base (surface or DIN rail) with the controller.
- Choose the electrode holder and probes separately (PS- or F03-series).
- Confirm the liquid is conductive at ≥ 100 µS / cm before installing.
- Check the relay in air and with water during commissioning.
Technical Specifications
| Series | 61F |
|---|---|
| Type | Floatless level controller (conductive) |
| Supply Voltage | AC 100-220 V, 50 / 60 Hz |
| Sensitivity Grade | G3 (high sensitivity) |
| Control Output | SPDT relay, 5 A at 250 VAC |
| Liquid Conductivity | 100 µS / cm minimum |
| Number of Probes | 2 or 3 electrodes (separate) |
| Connection | 8-pin plug-in octal base |
| Mounting | Surface or DIN rail via 8-pin socket |
| Operating Temperature | -10 to +55 °C |
| Protection Rating | IP20 (socket dependent) |
Resources & Downloads
FAQ for 61F-G3 AC100-220V
What is the difference between 61F-G3 and 61F-G?
Both are 61F-series floatless controllers on the same AC 100-220 V supply. The G3 is the high-sensitivity grade for high-purity water, steam condensate, and other low-conductivity liquids. The plain G is the standard grade for ordinary tap water and wastewater. Pick the G3 only when the standard G ignores the liquid.
Does the 61F-G3 work with any liquid?
Only with conductive liquids at about 100 µS / cm or higher. Tap water, wastewater, and most process liquids are fine. Oil, fuels, deionized water, and dry chemicals will not be detected. For non-conductive liquids, use a float switch, a capacitive sensor, or an ultrasonic level sensor instead.
What is included in the box?
The controller module only. The 8-pin octal base, the electrode holder, and the stainless-steel probes are sold separately. Common pairings are the PF113A or similar octal base and the PS-31 or F03-05 electrode holder. Order them together with the controller to avoid a second shipment.
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