*Refreshing this page at any point will restart the troubleshooting guide.
First, please reference the magnetic pickup manual. Each sensor has unique requirements for gear pitch and speed; and will be referenced throughout the troubleshooting process. This guide assumes that the device is properly configured to accept a magnetic pickup input.
Verify that the cable length between the sensor and meter is less than 10 feet in length.
Magnetic pickups generate a relatively small AC voltage, which will degrade over long distances of cable.
Is the less than 10 feet long? 
Shorten the cable, or change sensor type.
Verify that the sensing gear is made of ferrous material.
As the name implies, a magnetic pickup uses a magnetic field to detect the gear's movement.
Is the gear made of ferrous material?
Replace the gear with one made of magnetic material, or replace the sensor with one that can detect non-ferrous materials.
Verify that the sensing gear has a propper pitch for the sensor.
The larger the gear pitch value, the smaller the gear teeth will be. The minimum gear pitch is the smallest size tooth that the sensor can detect.
Does the gear have the correct pitch?
Replace the gear with one that has the correct pitch, or replace the sensor with one that can sense the existing gear.
Verify the air-gap between the sensor and the gear.
All Red Lion magnetic pickups require a maximum of 0.05" air-gap.
*note that a standard credit card is 0.03" thick
Is the air-gap correct?
Correct the air-gap.
Verify that the gear is moving at the correct speed.
Refer to the product manual, specifically the 1-Volt Threshold Speed column. The gear must be moving fast enough to generate a voltage high enough to register on the monitoring device. As the gear speed increases, the output voltage and frequency will also increase. Both the amplitude and frequency will need to be within the input specifications of the monitoring device.
Is the gear moving at the correct speed?
Replace the gear, sensor, or monitoring device to achieve a working system.
Verify the output voltage and frequency.
Use an oscilloscope to verify the output voltage and frequency.
Is the pickup outputting a signal?
It sounds like a bad sensor.
It sounds like a bad meter.
Please contact Technical Support.
Call us on the toll-free Tech Line: 877-432-9908 or the Support button on the lower right to fill out a contact form.
Disclaimer
It is the customer's responsibility to review the advice provided herein and its applicability to the system. Red Lion makes no representation about specific knowledge of the customer's system or the specific performance of the system. Red Lion is not responsible for any damage to equipment or connected systems. The use of this document is at your own risk. Red Lion standard product warranty applies.
Red Lion Technical Support
If you have any questions or trouble contact Red Lion Technical Support by clicking here or calling 1-877-432-9908.
For more information: http://www.redlion.net/support/policies-statements/warranty-statement