FT0021 Water Tank Level Meter
The FT0021 is a wireless tank level meter that measures liquid depth from 0 to 15 meters with 0.01 meter resolution and transmits readings to a base station every 30 seconds when the level changes or every 3 minutes when stable. It displays the level as a 10-element LCD bar graph
What This Model Is For
The FT0021 is a wireless tank level meter that measures liquid depth from 0 to 15 meters with 0.01 meter resolution and transmits readings to a base station every 30 seconds when the level changes or every 3 minutes when stable. It displays the level as a 10-element LCD bar graph, records min and max levels, and triggers high/low alarms and empty alerts. The unit includes indoor and tank temperature sensing, time alarm, and operates on a 433MHz RF link with 100m open-air range. It is designed for standalone or wall-mounted use and supports both alkaline and lithium batteries in the remote sensor.
- Measures liquid depth from 0 to 15 meters with 0.01 meter resolution and 0.03 meter accuracy
- Transmits updates every 30 seconds on change or every 3 minutes when stable
- 10-element LCD bar graph gives immediate visual level status
- Records and alerts on min/max levels and low/empty tank conditions
- 433MHz RF link reaches 100 meters in open air without a gateway
Product Images
Where It Is Used
- Farm irrigation tanks where water level must be monitored without daily visits
- Roof-top water storage in residential or commercial buildings with no wired access
- Industrial tanks in cold storage or chemical handling where wired sensors are risky
- Greenhouse or hydroponic systems needing automatic refill triggers
- Remote cabins or off-grid sites where tank monitoring is critical but power is limited
Who It Is For
- Agricultural and horticultural equipment suppliers adding tank monitoring to irrigation kits
- Building services and HVAC integrators installing tank level tracking in new builds
- Cold chain and refrigeration operators monitoring water or coolant levels
- Marine and leisure equipment brands bundling tank sensors with pool or boat systems
- Industrial tank monitoring integrators needing a battery-powered, wireless solution
Problems It Solves
- Tanks that run dry between manual checks, risking pump damage or system failure
- Wired sensors that require trenching or conduit runs in difficult terrain
- Lack of real-time level data when the tank is out of sight or in a remote location
- No visual indication of level status beyond a single number on a small display
- Battery-only sensors that fail quickly in cold or high-use environments
Technical Features
- Measures liquid depth from 0 to 15 meters with 0.01 meter resolution
- Accuracy of plus or minus 0.03 meters across the full range
- 10-element LCD bar graph for visual level status
- Records and displays min and max liquid levels
- High and low level alarms with empty tank alert
- Indoor temperature sensing from 0 to 60 degrees C
- Tank temperature sensing from -40 to 60 degrees C
- Time alarm function for scheduled checks
- 433MHz one-way transmission with 100m open-air range
- Transmission interval: 30 seconds on level change, 3 minutes when stable
- Remote sensor powered by 6 x AAA 1.5V alkaline or lithium cells
- Base station powered by 2 x AA 1.5V alkaline cells
- Free standing or wall mounting options
Specifications
Values taken from our own product documentation. Anything we cannot verify is marked rather than estimated.
| Water Level Range | 0 to 15 m |
|---|---|
| Resolution | 0.01 m |
| Accuracy | plus or minus 0.03 m |
| Transmission Frequency | 433 MHz |
| Transmission Range | 100 m in open area |
| Transmission Interval | 30 s on change, 3 min when stable |
| Indoor Temperature Range | 0 to 60 degrees C |
| Tank Temperature Range | -40 to 60 degrees C |
| Temperature Accuracy | plus or minus 1 degree C |
| Power - Receiver | 2 x AA 1.5V LR3 alkaline batteries |
| Power - Transmitter | 6 x AAA 1.5V LR6 alkaline or lithium batteries |
| Dimensions - Receiver | 108 x 94 x 27 mm |
| Dimensions - Transmitter | 97 x 68 x 152 mm |
| LCD Dimensions | 66 x 45 mm (3.3 inch) |
Materials and Construction
- Moulded plastic housing for the transmitter and receiver
- Weather sealed battery compartment sized for 6 x AAA cells
- Integrated LCD display with 10-element bar graph
How It Is Made
Transmitter and receiver sub-assemblies are populated and soldered on our own assembly line
Housings are sealed and checked on rainfall and waterproof test equipment
Every unit is aged before leaving the factory
Quality Control
- Rainfall and waterproof testing on the assembled transmitter
- Constant temperature and humidity chamber runs covering the -40 to +60 degrees C range
- Vibration testing to simulate transport and site loading
- Smog ageing to check housing and seal integrity
- Final ageing test on every unit before packing
Customisation Options
- Own-label printing and retail packaging
- Console pairing to a customer's existing UCTECH-protocol display
- Alternative battery configurations on request
- Manual and quick start guide in the destination language
Compared With the Alternatives
vs Wired tank level sensors
No trenching or conduit required; suitable for remote or hard-to-reach tanks
vs LoRa-based level meters
433MHz is lower cost and sufficient for a single tank; LoRa is better for large sites with multiple sensors
vs Manual tank checks
Eliminates human error and missed alerts; provides continuous monitoring
Use Guide
- Install the transmitter with the sensor probe fully submerged in the tank, ensuring no air bubbles in the tube
- Mount the base station within 100m of the transmitter in open air, or adjust for obstructions
- Insert batteries into the transmitter after the base station is set up to avoid pairing issues
- Press the tank key to display level data if the screen shows no reading
- Reset the unit by removing batteries, waiting 30 seconds, then reinserting to clear residual power
FT0021 Water Tank Level Meter Questions
What is the real range between the transmitter and base station
100 meters in open air. Through walls, foliage, or metal, expect around 30 to 50 meters depending on site conditions.
How often does it send an update
Every 30 seconds when the level changes. If the level is stable, it updates every 3 minutes.
Can I use lithium batteries in the transmitter
Yes. 6 x AAA lithium cells are supported and recommended for cold environments or long-term use.
Does the LCD show the level as a number or just a bar
It shows a 10-element bar graph. The exact level is not displayed numerically, but the bar gives a clear visual of full, half, or empty.
What should I do if the red light on the transmitter is not flashing
Check that the batteries are correctly inserted and the sensor is not obstructed. If the light remains off, reset the unit by removing the batteries for 30 seconds.
Can I pair this with a console I already sell
If your console uses the UCTECH 433MHz protocol, yes. Send us the model number and we will confirm compatibility.
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Request a Quote for the FT0021 Water Tank Level Meter
Tell us the quantity, the destination market and whether you need own-label printing. We will confirm pricing, pairing and lead time in writing.