Question: I have a new pipe, high quality material, and all installation requirements have been met, so why there is still no signal detected?
Answer: Check the pipe parameter settings, the installation method and wiring connections. Confirm that enough sonic coupling compound is applied to the bottom of each transducer, that the pipe is full of liquid, that transducer spacing is correct with the displayed calculated spacing, and that the transducers are installed in the right direction.
Question: I have old pipe with heavy scale inside, no signal or poor signal detected: how can it be resolved?
Answer: Make certain the pipe is full of fluid. If you were using V method, try the Z method for transducer installation. (If the pipe is too close to a wall, it may be necessary to install the transducers on a vertical or inclined pipe with flow upwards instead of on a horizontal pipe).
Carefully select a good pipe section and clean it well, apply a wide band of coupling compound on each transducer face (bottom) and install the transducer per the instruction manual.
Slowly and slightly move each transducer with respect to each other around the installation point until the maximum signal is detected. Be careful that the new installation location is free of scale inside the pipe and that the pipe is concentric (not distorted or out of round) so that the sound waves do not bounce outside of the proposed area.
For pipe with thick scale inside or outside, try to clean the scale off, if it is accessible from the inside. (Note: Sometimes this method might not work and sound wave transmission is not possible because of a layer of scale between the transducers and pipe inside wall).
Question: Why is there no CL (current loop) output?
Answer: Check to be certain that the desired current output mode is set in Window M55. See if the CL is powered off by CL Off settings.
Open the electronics enclosure to inspect the hardware circuitry. Check to see if the short-circuit terminal near terminal 3 is in place, i.e. Direct Output Mode (set CL output as Transmitter Mode with an external power supply).
Question: Why is the CL output abnormal?
Answer: Check to see if the desired current output mode is set in Window M55.
Check to see if the maximum and minimum current values are set properly in Windows M56 and M57.
Re-calibrate CL and verify it in Window M49.
Question: Why is the flow rate still displayed as zero while there is fluid obviously inside the pipe and a symbol of R displayed on the screen?
Answer: Check to see if Set Zero was performed with fluid flowing inside the pipe (Refer to Window M42). If it is confirmed, recover the factory default in Window M43.
Question: With a poor measurement site environment in the plant and wide power fluctuations (unregulated power supply), is the instrument really able to keep running continuously and last for years under such conditions?
Answer: The flow meter is designed to work with high reliability under such conditions. It is provided with intelligent signal conditioning circuitry and internal correction circuitry. It will work under strong interference conditions and is able to adjust itself with strong or weak sound waves. It will work in a wide band of voltages: 90-245VAC or 10V~36VDC voltage.
