OVERVIEW

The Flow Alarm can be configured for either intermittent flow  (suitable for dosing pumps) or continuous flow.  Both modes of operation sense liquid using a magnetic shuttle switch that is pushed into position when liquid impinges on it.  The shuttle switch detects flow less than 300 ml/min.  Once it goes into alarm, there is a snooze alarm feature to temporarily silence the buzzer for 30 minutes after an alarm.

CONTINUOUS FLOW

For pumps that must run 24/7 the Flow Alarm runs in a different mode that includes a power failure alarm so it alarms whenever there is flow. (or no flow)  Again the shuttle switch detects the presence (or absence of) flow or an alarm is given.  In addition, if there is a power failure, the Flow Alarm has a battery backup that sounds an alarm.  If your pump plug is unplugged from the receptacle, an alarm is given.

INTERMITTENT FLOW

The Flow Alarm is energized by the power to your dosing pump which is connected through a piggyback plug on the Flow Alarm.  When power is present, it waits for 10 seconds for flow to become established, and then gives an alarm if flow isn’t detected.  The shuttle requires a peak flow of 300 ml per minute to activate. 

For pulsing flows, the circuit buffers the readings so fluctuations are filtered. If there is a continuous 10 seconds without ever hitting the minimum 300ml/min flow,  then the unit responds. This way the unit can detect average flow of less than 300ml as long as there are spikes over 300ml/min.

FEATURES

• When there is an alarm, the push-button can be pressed to temporarily silence the alarm. An optional snooze-alarm feature sounds the alarm again after 30 mins.
• Test button where there is no active alarm.
• Power failure alarm built in.
• There is no real upper limit to the maximum flow except that it is a 3/4″ NPT pipe fittings.
• Reversible logic so it detects either presence of flow or lack of flow.
• Low battery alarm.

CONSTRUCTION

The physical form of the unit is a plug box that plugs into an outlet.  Power is passed through to your pump by plugging into the receptacle of the plug box.

• The flow switch is polypropylene with a monel spring to push the shuttle so it can be mounted in any orientation.
• Flow switch fitting size is 3/4″ NPT. Can be adapted to 1/2″ using reducing bushings.
• Lithium battery included.
• 10 feet of communications cable is standard.  Order extra length if needed.