What is the GLTV3 Reed Switch Fuel Level Sensor?
The GLTV3 is a reed switch liquid level sensor. Sealed reed switches are positioned inside the stainless steel probe shaft; a float with built-in magnets rises and falls with the liquid level, triggering the reed switches to generate a signal — resistance, current or voltage — that changes proportionally to the level. The signal is transmitted to the gauge via wires, giving an accurate, easy-to-read level indication.
The float is the only moving part of the sensor, minimizing potential mechanical failures and delivering precise, long-term measurement. The GLTV3 is built for harsh environments: corrosion-resistant stainless steel construction, IP67 protection, and a wide -40 to +85°C operating range.
GLTV3 Specifications
| Range | 100–2000 mm (customizable) |
|---|---|
| Medium | Gasoline, diesel fuel, water, polluted water, drinking water, alcohol, chemicals, etc. |
| Output | Resistance: 0–190 Ω / 240–33 Ω · Current: 4–20 mA · Voltage: 0.5–4.5 VDC / 0–5 VDC |
| Resolution | Standard 21 mm; 10 mm optional |
| Supply voltage | 10–32 VDC |
| Rated power | 125 mW |
| Rated current (alarm switch) | 500 mA |
| Accuracy | ±10 to ±40 mm (depends on total length; higher precision on request) |
| Operating temperature | -40 ~ +85°C |
| Protection rank | IP67 |
| Probe material | Stainless steel 304 / Stainless steel 316 |
| Float material | Plastic (oil medium) / SUS304 (drinking water, chemicals) / SUS316 (sewage) |
| Mounting | NPT 1 1/2", BSP 1 1/4", SAE standard 5-hole |
| Connector | AMP (Delphi / Tyco customizable) |
| Wire | PVC (PA corrugated pipe cover optional) |
| Alarm switch | Optional high or low level alarm |
| Warranty | 1 year |
Customization Options — Built to Your Tank
Every GLTV3 is built to order — 9 dimensions are fully customizable to match your tank, medium and gauge. Select the options below and tell us your configuration when requesting a quote.
GLTV3 – J(medium) – Xm(length) – P(resolution) – L(probe) – output – connector – I(mounting) – S(float) – H(alarm)
| Option | Code | Available Values |
|---|---|---|
| Medium | J1–J7 | Gasoline / Diesel fuel / Water / Polluted water / Drinking water / Alcohol / Chemicals (customizable) |
| Length | X = 100–2000 mm | Any length, customized to your tank depth |
| Resolution | P1 / P2 | 21 mm standard / 10 mm high precision |
| Probe material | L1 / L2 | SUS304 / SUS316 |
| Output signal | R / I / V | Resistance 0–190 Ω / Current 4–20 mA / Voltage 0.5–4.5 VDC |
| Connector | — | AMP standard / Delphi / Tyco (customizable) |
| Mounting | I1–I3 | SAE 5-hole flange / NPT 1 1/2" / BSP 1 1/4" |
| Float material | S1–S3 | Plastic (oil) / SUS304 (water, chemicals) / SUS316 (sewage) |
| Alarm | H1–H3 | High level alarm / Low level alarm / No alarm |
Installation Guide
- SAE 5-hole flange mounting — bolt the flange onto the standard 5-hole tank opening; 5 pcs M5 screws are included with the goods.
- NPT 1 1/2" threaded mounting — thread the sensor into the matching tank port.
- BSP 1 1/4" threaded mounting — for BSP-standard tank ports.
- The O-ring seal ensures leak-proof, maintenance-free installation. The float is factory-assembled; no on-site calibration required — connect the wires to the gauge and the level is readable immediately.
Applications
Truck & Fleet
Reliable fuel level monitoring for trucks, trailers and fleet vehicles — 10 mm high-resolution option for accurate fuel consumption tracking.
Marine
Marine-grade fuel senders with SAE 5-hole mounting and corrosion-resistant stainless steel construction for boats and ships.
Generator Sets
Continuous level sensing for outdoor generator fuel tanks, stable from -40 to +85°C in any weather.
Bus & Commercial Vehicles
OEM-quality senders widely used by automotive and marine OEMs, with customizable connectors (AMP / Delphi / Tyco) for production lines.
Which Fuel Level Sensor Fits Your Application?
| Feature | GLTV3 Reed Switch | GLTV7 Capacitive | GLT621 Magnetostrictive |
|---|---|---|---|
| Sensing principle | Reed switch + float | Capacitive | Magnetostrictive |
| Moving parts | Float only | No moving parts | Float + guide |
| Resolution | 21 mm (10 mm optional) | High | High precision, continuous |
| Range | 100–2000 mm | — | — |
| Output | Resistance / Current / Voltage | — | — |
| Best for | Cost-effective fuel level monitoring for trucks, marine, generators | Fuel & level sensing with no mechanical wear | High-precision continuous level measurement |
| Price level | $ Economical | $$ | $$$ |
Budget-friendly and versatile → GLTV3 · Maintenance-free long life → GLTV7 · Maximum precision → GLT621. Our engineers will help you choose — just send your requirements.
Frequently Asked Questions
What type of sensor is the GLTV3?
The GLTV3 is a reed switch-based liquid level sensor. A magnet embedded in the float actuates sealed reed switches inside the probe tube, providing accurate and reliable level measurement for various liquids.
What output signals does it support?
Multiple output options, customizable per application: Resistance 0–190 Ω or 240–33 Ω; Current 0–20 mA or standard industrial 4–20 mA; Voltage 0.5–4.5 VDC or 0–5 VDC.
What are the measuring range and accuracy?
Range: 100–2000 mm (custom ranges available). Accuracy: ±10 to ±40 mm depending on total length; higher precision available on request.
What types of liquids can it measure?
Fuels (diesel, gasoline, alcohol), water (potable, wastewater, general-purpose) and mild to moderately aggressive chemicals — material compatibility should be confirmed for special media.
What materials are available for construction?
Probe: L1 SUS304 / L2 SUS316 (enhanced corrosion resistance). Float: S1 Plastic (fuel/oil), S2 SUS304 (water, mild chemicals), S3 SUS316 (wastewater, corrosive environments).
What are the IP rating and operating temperature?
IP67 — dust-tight and protected against temporary immersion. Operating temperature -40~+85°C, suitable for harsh environments (trucks, marine, outdoor generators).
Does it support alarm functions?
Yes. Optional reed switch alarm contacts: H1 high-level alarm, H2 low-level alarm, H3 no alarm (default).
What are the power requirements?
Supply voltage 10–32 VDC, compatible with both 12 V and 24 V systems. Power consumption 125 mW (low power design).
How to choose the right probe length?
Measure the depth of your tank from the mounting surface to the bottom, then select the probe length closest to that depth. If in doubt, send us your tank dimensions — our engineers will recommend the right length.
How to choose the output signal to match my gauge?
Match your existing gauge type: resistance output (0–190 Ω) for OEM vehicle gauges, 4–20 mA for industrial control systems, voltage output (0.5–4.5 V / 0–5 V) for standard controllers. Tell us your gauge model and we will confirm compatibility.
Can I get a sample for testing before bulk order?
Yes. Contact our sales team to arrange samples for evaluation — we support testing before volume orders.
What are the MOQ and lead time?
MOQ and lead time depend on configuration and order volume. Contact our sales team for exact figures tailored to your order.
About GAMICOS
GAMICOS is an instrument manufacturer specializing in R&D, manufacturing, sales and service of sensors, transmitters and supporting instruments.
R&D & Manufacturing
In-house R&D, production and quality control for pressure, level and fuel sensors.
Certifications
Core products pass EU CE and RoHS testing; select products hold explosion-proof / flameproof and CCS certification.
Global Reach
Exported to 100+ countries and regions including the US, Germany, Russia, Saudi Arabia, India, Australia and Brazil.
Applications
Petrochemical, water conservancy, machinery, process control, oil level measurement, agricultural irrigation.
