OMRON 61F-GP-NH — Floatless Level Switch, AC220V, 8-Pin Plug-In

OMRON · 61F Series · Floatless Level Controller · 220 VAC · 1PC · In stock

The 61F-GP-NH is the basic 8-pin plug-in floatless level controller in OMRON's 61F series, factory-set for 220 VAC supply. Pair the relay with an OMRON PS-3S or PH-1 electrode holder and the SPDT output will switch on conductive-liquid level with no moving parts in the tank. The slim 8-pin octal base drops onto a standard P3G-08 DIN-rail socket, making the 61F-GP-NH a quick retrofit for legacy 90s-era level panels in water-treatment skids, building-services pump rooms and process plants.

1. Key Technical Specifications / Overview

The 61F-GP-NH is engineered for conductive liquids — water, weak acid, weak base, chemical mix — in industrial tanks, reservoirs and sumps. It is not designed for oil, fuel, or pure deionised water where conductivity is too low. The full datasheet snapshot is laid out below in the KOEED ledger format.

Within the 61F family, KOEED also stocks the 110 V 8-pin variant 61F-GP-N8 and 11-pin versions for high-level / low-level dual alarms. Engineers integrating OMRON level controls into a broader PLC cabinet often combine the 61F-GP-NH with a CP1E-N40DR-A compact PLC and an NS5-SQ10B 5-inch HMI for local status.

2. Application Scenarios / Where It Fits

The 61F-GP-NH is widely used across OMRON water-treatment skids, building-services pump rooms and process plants. Typical deployments include:

• Water storage tank high / low level alarms and pump cut-off
• Sump and drainage pit monitoring for basement and lift-station control
• Cooling tower basin level control in HVAC plants
• RO and demineralised make-up water feed tanks (with booster pumps)
• Chemical mixing and dilution tanks in mild-acid / mild-alkali service
• Boiler condensate return tanks and feed-water reservoirs
• Leak and overflow detection in food & beverage CIP loops

In many plants the 61F-GP-NH sits next to a Mitsubishi MR-J4 servo on a filling line, a Yaskawa CIMR-V inverter driving the pump, and a Schneider Magelis HMI for the operator display. Multi-vendor cabinets are normal in brownfield work, which is why KOEED keeps all nine Tier-1 brands — Allen-Bradley, Siemens, Mitsubishi, Omron, Fanuc, Schneider, Yaskawa, Panasonic and KEYENCE — under one RFQ workflow.

3. Integration & Wiring Notes

The 61F-GP-NH uses an 8-pin octal base (P3G-08 or equivalent DIN-rail socket). Pins 2 and 7 are the 220 VAC supply; pins 1, 3, 4, 5, 6 and 8 are routed to the electrode holder, the tank earth and the SPDT relay output. Because the controller senses conductivity between probes, the tank must have a reliable earth rod or structural ground — this is the single most common cause of nuisance tripping in the field.

For multi-tier alarms (low / high / overflow), stack two 61F-GP-NH units on the same socket rail, or step up to the 11-pin 61F-GP-N-VC variant. When the relay output feeds a PLC digital input — for example an OMRON CP1E DI module, a Siemens S7-1200 DI, or a Mitsubishi FX input — confirm the input card supports 24 VDC sourcing and that the relay contact is wired dry. If you need analog level trending, use the KOEED PLC Analog Calculator to convert a 4-20 mA submersible level transmitter into litres or percent full.

4. Installation & Commissioning Tips

Mount the socket vertically on a DIN rail in a dry panel (IP54 minimum). Keep the controller at least 100 mm clear of high-power contactors and variable-frequency drives such as the Yaskawa CIMR-V to avoid conducted EMI on the probe wires. Use shielded two-core cable from the socket to the electrode holder and ground the shield at the panel end only.

During commissioning, pour tap water into the tank to verify both the energise and de-energise levels. Confirm the relay pulls in within 1-2 seconds of the probes touching the liquid. If the relay chatters, check that the tank earth is below 1 kΩ. For sites with very long probe cables, add a 0.1 µF suppressor across the probe terminals — this is the OMRON-recommended fix. Once the unit is live, drop the part number into the KOEED AI Diagnostic Tool for instant help with error codes, alternatives, or migration to a 24 VDC supply.

5. Procurement, Warranty & Lead Time

The 61F-GP-NH is a current OMRON catalog number and is typically in stock at KOEED for same-day or next-day worldwide shipping. As a B2B distributor, we work on a 24-hour RFQ turnaround: send a single part number, a short list, or a full BOM to Moritta@KOEED.COM and you will receive availability and price within one business day.

All Omron level controllers supplied by KOEED are sourced through established Asian channels, visually inspected, electrically tested for line-to-line and probe-to-earth resistance, and shipped in anti-static packaging with a KOEED test sheet. Bulk pricing scales with quantity — drop a multi-line BOM into the Create a Quote form and we will respond with tiered pricing. KOEED is not an authorised OMRON subsidiary, but our 12-month warranty covers replacement of any unit that fails under normal operating conditions.

Engineers handling a larger water-treatment retrofit can pair this order with spare OMRON CJ2M-CPU31 CPUs, Mitsubishi FX-series expansion, Siemens LOGO! modules, Allen-Bradley MicroLogix 1761 spares, Fanuc A06B servo amplifiers, Panasonic FP0R relays, KEYENCE LV-N11N photo sensors and Schneider Magelis touch panels — all in one shipment.