Technical illustration of verification
Electromagnetic flow measurement is based on Faraday's Law. To ensure an accurate measurement the Verificator must test the whole signal chain in the flowmeter, sensor, cabling and converter, starting with:
Power to drive the magnetic field
Continuously stable magnetic behavior
Converting flow velocity to a flow signal
Flow signal without disturbance
Correct connection for accurate flow signal
Signal processing and calculation
Flow signal on output
Technical illustration of verification
Electromagnetic flow measurement is based on Faraday's Law. To ensure an accurate measurement the Verificator must test the whole signal chain in the flowmeter, sensor, cabling and converter, starting with:
Power to drive the magnetic field
Continuously stable magnetic behavior
Converting flow velocity to a flow signal
Flow signal without disturbance
Correct connection for accurate flow signal
Signal processing and calculation
Flow signal on output

A fully automatic verification test consists of 3 steps
Connection
The MAGFLO® Verificator automatically performs all tests with a certificate which rates the flowmeter performance. The verification is carried out at the signal converter connection socket after relocating the plug-in converter. The test is not influenced by liquid flow or subject to any limitations in the interconnecting cabling between sensor and converter. After verification the data is downloaded to a PC for a print out of the certificate and to store the verification data in a file.
A fully automatic verification test consists of 3 steps
Connection
The MAGFLO® Verificator automatically performs all tests with a certificate which rates the flowmeter performance. The verification is carried out at the signal converter connection socket after relocating the plug-in converter. The test is not influenced by liquid flow or subject to any limitations in the interconnecting cabling between sensor and converter. After verification the data is downloaded to a PC for a print out of the certificate and to store the verification data in a file.

Step 1. Signal converter test
The converter verification checks the whole electronic system from signal input to output. Using the excitation power output, which is generated to drive the sensor's magnetic field, the verificator simulates flow signals to the converter input. By measuring the converter outputs the Verificator calculates its accuracy against defined values.

Excitation power to drive the magnetic field
Signal function from signal input to output
Signal processing - gain, offset and linearity
Test of analogue and frequency output
Step 1. Signal converter test
The converter verification checks the whole electronic system from signal input to output. Using the excitation power output, which is generated to drive the sensor's magnetic field, the verificator simulates flow signals to the converter input. By measuring the converter outputs the Verificator calculates its accuracy against defined values.

Excitation power to drive the magnetic field
Signal function from signal input to output
Signal processing - gain, offset and linearity
Test of analogue and frequency output

Step 2. Flowmeter insulation test
The verification test of the flowmeter insulation is a "cross-talk" test of the entire flowmeter which ensures that the flow signal generated in the sensor is not affected by any external influences. In the cross-talk test the Verificator generates a high voltage disturbance within the coil circuit and then looks for any cross-talk induced in the flowsignal circuit. By generating dynamic disturbances close-coupled to the flow signal the flowmeter is tested for noise immunity to a maximum level.
EMC influence on the flow signal
Moisture in sensor, connection and terminal box
Non-conductive deposit coating the electrodes within the sensor
Missing or poor grounding, shielding and cable connection

Step3. Sensor Magnetism test
The verification of the sensor magnetism is a "boost" test of the magnetic field coil. The test ensure that the magnetism behaviour is like the first time, by comparing the current sensor magnetism with the "fingerprint" which was determined during initial calibration and is stored in the SENSORPROM®



In the "Boost" test the verificator changes the magnetic field in certain patten and with high voltage to get quick stable magnetic condition. This unique test is fulfilled without any interference or compensation of surrounding temperature or interconnecting cabling.

Changes in dynamic magnetic behavior
Magnetic influence inside and outside the senor
Testing is made at the converter location without disconnecting any cabling.
Missing or poor coil wire and cable connection