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Beck 981 Water Level Transmitter for BMS
Monitor water levels in overhead tanks, sumps and cooling towers from your BMS.
A water level transmitter for BMS use gives facility teams a continuous reading of every tank from a central screen, instead of checking each one by hand. The Beck 981 covers overhead tanks, sumps, fire water tanks and cooling tower basins up to about 6 m, with a 4 to 20 mA or 0 to 10 V output.
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Selection guide
Beck 981 Water Level Transmitter for BMS Guide
What the Beck 981 is used for
The Beck 981 measures water level continuously and outputs a signal proportional to depth, up to about 6 m of water. Connected to the BMS, it lets facility teams see every tank's level on one screen, trend usage over the day or week, and act before a tank runs dry or overflows, rather than relying on a site walk-round or a local sight glass.
How to choose a water level transmitter for your BMS
- Range: the Beck 981 suits tanks up to about 6 m of water; for deeper tanks or sumps, use the hydrostatic continuous level transmitter, which covers a far greater depth.
- Output: choose 4 to 20 mA for most BMS analogue input cards, or 0 to 10 V if your controller's input is voltage-based.
- Alarming: set low and high alarm points in the BMS logic itself, since the transmitter's output is continuous rather than a fixed switch point.
- Pump control: the same signal that trends the level can drive transfer pump start/stop logic in the BMS, removing the need for a separate float switch.
- Application: it covers overhead and underground water tanks, sumps, cooling tower basins and make-up tanks, and can show fire water tank levels alongside the fire system's own dedicated devices.
For tank monitoring outside the BMS, or level switching rather than a continuous reading, see level sensors for building water tanks.
FAQ
Common questions
Can the BMS alarm on low water level with this transmitter?
Yes. The Beck 981 sends the level continuously, so the BMS logic can raise an alarm at any level you set, and trend usage over time to spot a leak or unusually high consumption before it becomes a problem.
Can the transmitter control the transfer pump?
Yes. The BMS, or a standalone controller, can start and stop the transfer pump at set levels using the transmitter's 4 to 20 mA or 0 to 10 V signal, instead of a separate float switch wired directly to the pump starter.
Is the Beck 981 suitable for a fire water tank?
It can show the fire water tank's level on the BMS alongside domestic and cooling tower tanks, so facility teams see it on the same screen. It doesn't replace any level devices your fire regulations require, which typically stay as dedicated, independently monitored equipment.
What is the maximum tank depth for the Beck 981?
It covers ranges up to about 6 m of water, which suits most overhead tanks, sumps and cooling tower basins in buildings. For deeper tanks, boreholes or reservoirs, the hydrostatic continuous level transmitter covers a far greater depth.
How many tanks can one BMS monitor with these transmitters?
As many as the BMS has analogue inputs for, since each Beck 981 wires back as its own 4 to 20 mA or 0 to 10 V loop. For sites with many tanks, a Modbus transmitter such as the hydrostatic or ultrasonic models can reduce cabling by polling several tanks on one network.
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