Lovato Electric 31LV2E48 is an LV2E plug-in conductive liquid level control relay with an automatic emptying function, dual 24/48 V AC supply, three-electrode monitoring and one SPDT changeover relay output.
£168.88
The Lovato Electric 31LV2E48 is an LV2E conductive liquid level control relay designed specifically for automatic emptying applications in tanks, reservoirs, wells and industrial process systems. Its dual-voltage 24/48 V AC supply and plug-in construction provide a practical solution for low-voltage control panels and automated pump systems.
The relay monitors electrically conductive liquids using up to three external electrodes. With a fixed sensitivity of 7–8 kΩ and an electrode voltage of 9 V AC, the 31LV2E48 detects changes in liquid level and operates its changeover relay output to control associated pumps, contactors, valves or signalling equipment.
Designed for an 11-pin plug-in socket, the 31LV2E48 features automatic resetting, a red LED for relay status and a single SPDT changeover output. Its self-extinguishing polycarbonate housing measures just 38 × 76 × 70 mm, making it a compact and serviceable choice for industrial liquid-level control installations.
The Lovato 31LV2E48 operates by applying a low 9 V AC sensing voltage between external electrodes installed at the required liquid levels. Conductive liquid completing the electrical path between the probes allows the relay to determine the level condition and operate its output accordingly, providing an effective method of controlling liquid removal without mechanically moving float mechanisms.
With its dedicated emptying function, the 31LV2E48 can be integrated with a pump contactor or other switching device to automatically remove liquid as predetermined levels are reached. Its fast response, automatic resetting and plug-in design make it well suited to pump panels, water-management systems and industrial process equipment requiring dependable conductive level monitoring.
| Manufacturer | Lovato Electric |
|---|---|
| Series | LV2E |
| Model | 31LV2E48 |
| Manufacturer part number | 31LV2E48 |
| Product type | Level monitoring relay |
| Suitable liquid | Conductive liquids |
| Function | Emptying |
| Reset | Automatic |
| Supply type | Dual voltage AC |
| Rated supply voltage (Us) | 24/48 V AC |
| Operating voltage range | 0.85–1.1 × Us |
| Rated frequency | 50/60 Hz |
| Maximum power consumption | 5.5 VA |
| Maximum power dissipation | 2.8 W |
| Number of connectable electrodes | 3 |
| Compatible electrode systems | SN1, SCM, CGL, PS31, PS3S or similar |
| Electrode voltage | 9 V AC between probes |
| Sensitivity | 7–8 kΩ fixed |
| Tripping time | ≤0.05 s |
| Resetting time | ≤0.1 s |
| Number of relay outputs | 1 |
| Contact arrangement | 1 changeover contact, C/O-SPDT |
| IEC conventional free-air thermal current (Ith) | 5 A at ≤40 °C |
| Rated operational voltage AC | 220 V AC |
| Maximum switching voltage | 380 V AC |
| Utilisation designation | B300 |
| Electrical life | 2.5 × 105 cycles at rated load |
| Mechanical life | 50 × 106 cycles |
| Status indication | 1 red LED for relay state |
| Connection | 11-pin plug-in |
| Required socket | S11 |
| Rated insulation voltage (Ui) | 415 V |
| Rated impulse withstand voltage (Uimp) | 5 kV |
| Operating temperature | -20 to +60 °C |
| Storage temperature | -30 to +80 °C |
| Housing material | Self-extinguishing polycarbonate |
| Protection rating | IP30 |
| Dimensions (W × H × D) | 38 × 76 × 70 mm |
| Product weight | approx. 266 g |
| EAN / GTIN | 8013975015179 |
| ETIM classification | EC001447 – Level monitoring relay |
| HS Code | 85389091 |
The 31LV2E48 is a conductive liquid level monitoring relay with an emptying function, designed to control equipment such as pumps according to the liquid level detected by external electrodes.
The relay has a dual-voltage supply and can operate from 24 V AC or 48 V AC at 50/60 Hz.
The 31LV2E48 supports up to three electrodes. Lovato lists compatible electrode and holder families including SN1, SCM, CGL, PS31 and PS3S.
The relay has a fixed sensing sensitivity of 7–8 kΩ and applies approximately 9 V AC between the level probes.
The relay provides one SPDT changeover contact with an IEC conventional free-air thermal current rating of 5 A at temperatures up to 40 °C.
Yes. The 31LV2E48 features automatic resetting as part of its conductive liquid emptying-control operation.
The relay uses an 11-pin plug-in housing and is designed for installation with the Lovato S11 socket.
No. Its sensing principle relies on electrical conductivity between the electrodes, so the 31LV2E48 is intended for electrically conductive liquids.
Lovato Electric level monitoring relays provide practical solutions for conductive liquid control in industrial and building-services applications, helping panel builders, machine manufacturers and automation professionals implement reliable pump, drainage and process level control systems.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...