The Senso4s Basic sits underneath your gas cylinder and weighs it continuously to give you accurate readings on exactly how much LPG you've got left. It's a weighing scale designed specifically for gas bottles, and works with steel, aluminium or composite cylinders between 180mm and 320mm diameter at the base. Three adjustable feet extend from the centre unit to fit your bottle size, raising the cylinder by just 29mm. The device takes measurements every 15 minutes and stores the data, which connects to the free Senso4s app via Bluetooth whenever you're within 20 metres.
How accurate is the Senso4s Basic for monitoring gas levels?
The Senso4s Basic measures gas levels to within 1% accuracy by weighing your cylinder rather than using ultrasonic or pressure methods. It supports cylinders up to 45kg total weight with a maximum LPG capacity of 16kg, and measures changes of 200g or more. The system runs on three AAA batteries lasting up to 18 months and provides consumption forecasts based on your usage patterns.
You get real-time monitoring through the app showing percentage remaining, days of gas left based on your usage, and historical consumption graphs. The app works with Android 5.1 or newer and iOS 8.2 or newer, and you're free to connect multiple Senso4s devices if you've got several cylinders to monitor. The unit carries ATEX Zone 2 certification for propane and butane, making it safe for use around LPG, and has IP44 weather resistance for outdoor installation. It's suited to static applications like home barbecues, camping setups, or permanently sited caravans where the cylinder isn't moved frequently.
Specifications- Dimensions of the product (closed): (L x W x H): 198 x 179 x 29 mm
- Dimensions of the product (extended): (L x W x H): 320 x 284 x 29 mm
- Allowed gas cylinder dimension: 180 to 320 mm (outer base diameter)
- Product net weight: 0.28 kg
- Maximum weight load: 45 kg (total weight: gas + cylinder)
- Minimum weight load: 3 kg
- Safe overload: 90 kg
- Measuring accuracy: ± 1 %
- Maximum inclination of the device: 6°
- Supply voltage: 3x AAA batteries (alkaline, LR03), 1.5 V (not included)
- Battery lifetime: up to 18 months
- Bluetooth (4.0) signal range: 20 m
- IP Rating: IP44
- Ambient temperature: -10 °C to +40 °C
- Housing material: ABS / PC
- EX Classification: II 3G Ex ic IIA T4 Gc (EX Zone 2, propane/butane)
- Motion detection: No
- Inclination detection: No
- Ambient temperature monitoring: No
Frequently Asked Questions
The Senso4s Basic uses precision weighing technology rather than ultrasonic or pressure methods. Your gas cylinder sits on three adjustable feet that contain sensors measuring the total weight. The device subtracts the cylinder's tare weight to calculate exactly how much LPG remains inside. This weighing method provides accuracy to within 1% across the full range, measuring changes of 200g or larger. The system takes readings every 15 minutes and stores the data locally until you connect via Bluetooth to view your levels on the app.
The Senso4s Basic works with all conventional gas cylinders made from steel, aluminium or composite materials. The adjustable feet extend from 180mm to 320mm to fit the outer base diameter of your cylinder, covering most standard UK propane and butane bottles including 6kg, 13kg and similar sizes. The unit supports up to 45kg total weight with a maximum LPG capacity of 16kg. A typical UK 6kg propane bottle weighs approximately 13-14kg when full, well within the supported range. The device must be placed on solid, level ground and won't work properly on soft surfaces like carpet or grass.
The Senso4s Basic is designed for static applications where the gas cylinder remains stationary during use. It lacks the motion detection and tilt sensors found in the Senso4s Plus model, which means readings become unreliable if the cylinder moves or tilts during travel. The Basic version suits permanently sited caravans, seasonal pitches, home barbecues and camping where your cylinder stays in one position. If you tour regularly with a motorhome or caravan, the Senso4s Plus provides motion detection that pauses measurements during travel and resumes once stationary, making it the appropriate choice for mobile applications.
The Senso4s Basic runs on three AAA alkaline batteries with an expected life of up to 18 months under normal use. Battery life depends on measurement frequency and Bluetooth connection patterns. The app displays battery status so you know when replacement is needed. For longest battery life, use new alkaline batteries of the same type and brand. Batteries are not included with purchase. The device will not store measurements taken when batteries are dead or removed, so you'll need to set up your cylinder again after battery replacement.
Tare weight is the empty weight of your gas cylinder without any LPG inside. This weight is stamped or embossed somewhere on every UK gas bottle, usually on the collar or base. The Senso4s app requires you to enter both the tare weight and total gas capacity during initial setup so it can calculate how much LPG remains. For example, a 6kg propane bottle typically has a tare weight around 7.3-7.5kg. Even identical bottle models may have slight variations in tare weight, so check the specific number on your cylinder rather than assuming standard values. If you cannot locate these details, contact your gas supplier for assistance.
The Senso4s Basic operates entirely via local Bluetooth connection with no cloud service, WiFi or mobile data required. The device stores measurements locally and transmits data to your smartphone or tablet when you connect via Bluetooth within the 20 metre range. This means it works completely off-grid without any ongoing costs or internet dependency. You don't need to register an account or provide any personal information to use the system. Multiple people can connect to the same Senso4s device using the app on their own phones, though only one person can connect at a time.
Weighing provides the most accurate method for determining gas levels in a cylinder, with the Senso4s Basic achieving plus or minus 1% accuracy. This compares favourably to magnetic strip indicators that rely on temperature differences and provide only approximate readings, or pressure gauges that can't distinguish volume until the cylinder is nearly empty. Ultrasonic monitors also achieve high accuracy but typically cost more and require magnetic attachment to steel bottles. The weighing approach works regardless of cylinder material and isn't affected by paint thickness, temperature changes or bottle condition. Real-world testing shows readings within 0.5% of actual fill levels on properly calibrated systems.
The Senso4s app supports multiple devices, allowing you to monitor as many gas cylinders as you need from a single smartphone or tablet. Each Senso4s unit has a unique MAC address displayed on the battery cover sticker for identification. You can give each device a custom name in the app to distinguish between them, such as barbecue bottle, patio heater or caravan cylinder. The system only connects to one Senso4s device at a time, so you'll need to switch between them in the app to view different cylinders. This makes it practical for homes with multiple gas appliances or campsites with several bottles in use.
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