# 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. |