TF1100-EH transit-time handheld flowmeter manual
10
Z-Mount
is commonly used when the pipe diameter is between 300 millimeters and 4500
mm.
W method
W-Mount
is usually used on plastic pipes with a diameter from 10 mm to 50 mm.
2.8 INSTALLATION CHECKUP
Through the checkup of the installation, one can: check the receiving signal strength, the
signal quality Q value, the traveling time difference of the signals, the estimated liquid speed,
the measured traveling time of the signals and the calculated traveling time ratio. Therefore,
optimum measurement result and longer running time of the instrument can be achieved.
2.8.1 SIGNAL STRENGTH
Signal strength indicates the amplitude of receiving ultrasonic signals by a 3-digit number.
[00.0] means there is no signal detected and [99.9] refers to the maximum signal strength that
can be received.
Although the instrument works well if the signal strength ranges from 50.0 to 99.9, stronger
signal strength should be pursued, because a stronger signal means a better result. The
following methods are recommended to obtain stronger signals:
(1) Relocate a more favorable location, if the current location is not good enough for a stable
and reliable flow reading, or if the signal strength is lower than 700.
(2) Try to polish the outer surface of the pipe, and apply more coupler to increase the signal
strength.
(3) Adjust the transducers both vertically and horizontally while checking the varying signal
strength, stop at the highest position, and then check the transducers spacing to make
sure the transducers spacing is the same as what the M25 shows.
2.8.2 SIGNAL QUALITY (M90)
Signal quality is indicated as the Q value in the instrument. A higher Q value would mean a
higher Signal and Noise Ratio (short for SNR), and accordingly a higher degree of accuracy
would be achieved. Under normal pipe condition, the Q value is in the range 60-99, the
higher the better.
Causes for a lower Q value could be:
(1)
Interference of other instruments and devices such as a powerful converter working
