SENSING METHOD
The FLOW ALARM uses a shuttle type switch to detect when the flowrate falls below 300 ml/min. The liquid impinges on the switch to physically push it up. If there is a lack of flow then an alarm is given with beeping audio alarm and flashing LED.
OPERATION
Typically a pump is controlled by another sensing device and will start pumping; the flow alarm allows a delay time for flow to be detected. (selectable 5s or 30s) If no flow is detected in this time, then the alarm is given.
SILENCING ALARM
During an alarm, the green button can be pushed to temporarily silence the alarm for 5 mins or 60 mins. (selectable)
TEST BUTTON
When there is no alarm condition the button serves to test the battery power and the circuitry. LED flashes and buzzer sounds while button is pushed.
POWER FAILURE
For applications where flow must be maintained 24/7 the FLOW ALARM can detect power failure as well as low flow. If the power fails, an alarm is given. (which is distinct from the low flow alarm)
HIGH FLOW
There is a jumper setting on the pcb that will reverse the logic and allow the Flow Alarm to give an alarm when flow is higher than 300 ml/min.
LOW BATTERY
The ultra-low power consumption allows even alkaline batteries to last for 4 years, and Lithium batteries to last for 20 years. Nevertheless, if the battery power is low, and alarm sounds twice per minute.
PULSING FLOW
Pulsing flow from diagphragm pumps does not bother the unit. The circuit buffers the readings so fluctuations are filtered. After 10 or 30 seconds (selectable) of no-flow, the unit responds with an alarm.
MODELS AVAILABLE
- The FA-3 is waterproof. Includes a 10 foot piggyback plug cord.
- Model FA-4 is preferred when the power is a long distance from the pipe to be monitored. 25 foot wire is standard. Can also detect power failure for continuous monitoring sutuations.
INSTALLATION NOTES
- Flow switch fitting size is 3/4" NPT. Can be adapted to 1/2" or 1" using reducing bushings. (free if needed)
- The orientation of the shuttle switch must be vertical so shuttle switch returns to the down position using gravity. If non-vertical orientation is required please discuss this with Gizmo Engineering.
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