4.3 Meter (Measurement Settings)

Damping Factor	The purpose of setting the damping coefficient is to smooth the output value. 0​ means no smoothing effect. 99​ indicates the maximum smoothing effect. It is recommended to set this factor to 0​ when calibrating the flowmeter.
Low Flow Cutoff	When the flow rate is set to value output 0​, avoid zero run-in value caused by the invalid cumulative value.
Set Zero	Due to unavoidable errors in the manufacture of circuits, probes, wires, etc., even when measuring stationary fluids, there is still a time difference. This function can be utilized when the fluid is at a standstill. The system will automatically sample enough zero data to calculate and automatically deduct.
Reset Zero	Zero setting value is 0​.
Manual Zero Point	Manually enter the static zero offset value in nanoseconds (ns). The relative flow rate value (in m/s) will be displayed below the input for reference.
Scale Factor	Enter this slope correction factor to correct the measured value. For example, if the measured value is 1, but the actual value should be 1.2, then enter a correction factor of 1.2​.
System Lock	Set a six-digit passcode to lock the settings interface. The password must be input to enter the interface. Enter 0​ to cancel the passcode lock.
Poor Signal Value	When the ultrasonic signal is too weak or of poor quality, the system will automatically respond in one of the following two ways (default value is 1​): 1. Hold: Continue using the last measurement data. 2. Zero: Output is 0
Analog Output	Select 4-20 mA current output items: 1. Flow Rate 2. Flow Velocity 3. Up Temperature 4. Down Temperature 5. Sound Velocity 6. Delta Temperature
4mA Value	The corresponding value of the above output item is 4 mA. For example: 4 mA = 0 L/min
20mA Value	The corresponding value of the above output item is 20 mA. For example: 20 mA = 10 L/min
4mA Cal.Set	After entering this setting, the analog output terminal will output a 4-mA signal, which can be fine-tuned by setting this parameter. The unit is about 0.004 mA and the adjustable range is -250~250.
20mA Cal.Set	After entering this setting, the analog output terminal will output a 20-mA signal, which can be fine-tuned by setting this parameter. The unit is about 0.004 mA and the adjustable range is -250~250.
Rx Peak Level	This parameter is used as a reference for judging the ultrasonic echo amplitude. The default value is 0.375 V. For example, if the received signal amplitude is 0.3 V, the RSSI will be expressed as 0.3/0.4 * 100% = 80%. In practice, many factors, such as probe characteristics, wire length, setup, fluid type, etc., will affect peak echoes. Therefore, if setup is good and the Q value of the signal is stable, but the RSSI is too low or too high, this parameter can be modified. Under normal conditions, the following values are recommended: 0.5,​ 0.375​, 0.25​, 0.125​ (V0P).
Flow Direction	Select the flow direction of the current fluid in the pipe (default value is 1​): 1. Bidirectional: Simultaneous measurement of bidirectional flow. Values will be positive or negative depending on the flow direction. 2. Forward: Measures forward flow only. Negative flow will show as 0.​ 3. Backward: Measures negative flow only. Forward flow will show as 0​.
Anti-noise	The default value is 1 ​(ON​). If correct measurements cannot be made due to high flow velocity, set this option to 2 (OFF​) to avoid filtering, and the program will filter out the high flow rate values. Turning off this feature may cause a severe jump in the measured value in rare cases where the flow field of the pipeline is disturbed and the Q value is unstable.