LOW LEVEL DRUM ALARM  warns of empty drums with a bright flashing LED and a loud beeper when liquid level is low.

Low level drum alarm

Drum Low Level Control…

  • Always on duty because the liquid suction tube is permanently attached to the alarm unit.

  • It can go anywhere because its battery powered. No need for power outlets.

  • Uninterruptible battery power lasts for years. Lithium battery included.

  • Loud warbling tone cuts through the loudest industrial noise.

  • Rugged. Built for rough, wet and corrosive environments.

  • Protects your pumps from debris with an intake screen.

  • Adjustable depth using a thumbscrew.

  • No metal parts to corrode.

MONITOR LOW LIQUID LEVEL IN DRUMS continuously with the Drum Alarm™.  Quick and easy to install – simply connect the battery and your liquid suction line and you’re ready to go!


Various mounting styles available for any container.  The slip-on cap is the most popular as it makes transfer to new drums so easy since you don’t have to screw it in, instead it just drops over the bung.

On the other hand, threaded drum plug mounting is more secure and can seal the drum when noxious vapors are a problem. 


An attached suction pipe can’t be separated from the float switch, so the level alarm is always on duty. The rigid suction pipe ensure that your pump is always drawing liquid from below the alarm point.  At the same time, adjusting the depth to the bottom of a drum makes sure the maximum all the chemical is extracted from your drums a the float switch leaves only a couple of millimeters of residue. 



Removable screen built into the suction pipe guards your pumps from debris or crystals.

In addition, the bottom of the pipe is designed to accept an optional check valve for pumps that lose their prime.

Uninterruptible battery power works despite power failures, can’t come unplugged.  Because the Drum Alarms don’t use any power until alarming, the batteries last for years.

more on battery power…

Secure compression tubing connection eliminates air leakage into your feed lines.

Models with built-in flow indicator allows you to verify flowrate and inspect the solution. (all models except DLK)


All models are adjustable depth with a convenient thumbscrew. All are available to fit any container size.  

  • DLA series incorporates an slip-on cap for fast drum transfers.  Includes flowmeter.
  • DLAX is the same thing but without flowmeter.
  • DLP models include a 2″ NPS threaded plug. (the fine drum thread) DLPX has no flowmeter.
  • DLB models have 2″ buttress thread. (coarse – 1.5 threads per inch) DLBX means no flowmeter.
  • DLK series has no liquid suction pipe – alarm only. Mounts in the 3/4″ NPT thread common on steel drums. Add an adapter to mount on the 2″ NPS or Buttress threaded bung.

For the above models, here is the lettering system:

P= NPS plug
B= Buttress thread plug
A= slip-on cap
X =no flowmeter.

Different materials available on all drumalarms. Polypropylene is used 95% of the time but Kynar or 316 stainless steel are available.  Contact us to order these.

Drum_alarms high level


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Some Chemicals Commonly Used with polypropylene Drum Alarms:
  • Aqueous Ammonia (conc.)
  • Aqueous solutions to 100°C
  • Hydrochloric acid (conc.)
  • Nitric acid (30%)
  • Oils (including waste oils)
  • Potassium carbonate (40%)
  • Sodium hydroxide (50%)
  • Sulfuric acid 70%
  • Sodium Hypochlorite
The following are not compatible with the acrylic flowmeter:
  • Sulfuric acid 98%
  • Lactic acid
  • Peracetic acid
  • Perchloric acid
  • Ketones

chemical resistance chart

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Slip-on lid, with liquid suction pipe

Flowmeter option
Drum size
Tubing fitting size (O.D.)

2″NPT mount, with liquid suction pipe

Flowmeter option
Drum size
Tubing fitting size (O.D.)

Buttress thread, with liquid suction pipe

Flowmeter option
Drum size
Tubing fitting size (O.D.)

3/4″NPT mount, no liquid suction pipe

Drum size


Relay Output with Cord

Switches a relay to control pumps or solenoids etc. Silences & tests alarm. Piggyback plug makes hookup easy. Instructions here
[RL-AC] $84

Silencing Button/Low Battery Alert

The Drumalarm already comes with a Button that tests the unit: this option adds a circuit that allows an operator to silence the buzzer while LED continues to flash. Resets automatically. Includes a low battery warning.

[SL1] $45

Different Buzzer Tones

Different buzzer tonesto audibly identifydifferentunits. Hear the  different tone types here
[BZ-xx] $18

Tone Type
Wireless Tank alarmWireless Transmitter & Receiver

Wireless transmitter inside the level alarm sends a wireless signal to the receiver. Buzzer and relay in receiver.   more info
[w2] $205

AC Power Cord

When plug-in AC power is preferred. No battery.  Comes with 3-prong plug and 8-foot rubber-jacketed SJOOW cord. Power convertor is inside the enclosure.
[C-NA] $36

Alternate Color LED

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Default color is red. Amber, Blue, green, and white are options.     [BL-x] $11

PLC Output

A circuit board allows you to select N.C. or N.O. output to your PLC. Includes button to silence buzzer. Includes 10ft of communications cable.
[PLC1] $76

Input power
Check Valve

Optional check valve for use with diaphragm pumps, it stops the liquid from draining out of the feeding pipe during transfer to a new container. Eliminates re-priming pump.

Drum Wedge

A better way to prop up your drum so you can extract the last residue. Sure a block of wood could do the trick but will your customers be impressed by it during factory inspections? 

Buzzer Volume Control

Sometimes our buzzers are too loud.  Snap-on “muffler” reduces the volume by 20 db an d anywhere in between just by rotating the slots. [V-1]     $7

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