How to use the Totalizer Pulse Output?
- The totalizer output will produce a pulse output with every unit flow of the totalizer.
- The totalizer pulse output can only be realized by mapping the pulse output to the OCT or BUZZER hardware devices.
- For example, assume that the POS totalizer pulse output is needed, and every pulse should represent 0.1cubic meter of liquid flow; the pulse output will be mapped to the internal Buzzer, so that with every 0.1 cubic meters of flow the BUZZER will beep for a while.
- The following setups should be taken/performed:
- Select the unit Cubic Meter under window M32.
- Select the Multiplier as ‘2. X0.1’ under window M33.
- Select the output option ‘9. POS INT Pulse’ under window M77. (INT stands for totalized )
How to use the Frequency Output?
- There is a Frequency Output in all WUF 1oo CF series flow meters. This frequency output signal, which represents the flow rate, is intended to connect with other instruments.
- The Frequency Output is totally user-configurable. Generally, four parameters should be configured for the setups.
- Enter the lower flow rate value in window M68 and the higher flow rate value in window M69.
- Enter the frequency range in window M67.
- for other instrumentation. The user should enter 0 in M68 and 3000 in M69, and enter 200 and 1000 in window M67.
- Please note that the user has to make the selection with OCT setups in window M78.
How to use 4-20mA current loop output?
- The accuracy of the current loop output is better than 0.1%. It can be configured to different
mode, such as 4-20mA mode, 0-20mA, etc.
- Mode selection can be made in the menu M55.
Refer to the next chapter for details on M55.
- In order to use the 4-20mA output function, you need not only select the mode to be
4-20mA in M55, but also set the flow rate values which correspond to the minimum current (4mA) and the maximum current (20mA).
- Enter the two values in M56 and M57.
- Example A: The flow rate range is 0-500m3/h. Just enter 0 in M56 and 500 in M57.
Example B: The flow rate range is -500-0-1000m3/h. If flow direction is not an issue for you, you
may select 20- 4-20mA mode in M55. Then, enter 500 in M56 and 1000 in M57. If flow
direction is an issue, you may select 0-4-20mA mode in M55.
- This means that the current
the loop will output 0-4mA when the flow rate is negative and 4-20mA when the flow rate is positive.
Enter -500 in M56 and 1000 in M57.
- You may need to calibrate and test the current loop output before using it. Just go to menu M58 and do the following :
- First, connect an ammeter to the current loop output.
- Press MENU 5 8, then ENT to enter into menu M58.
- Use /+ and /- to display “0mA”, “4mA”, “8mA”, “16mA”, “20mA”
- orderly, record the corresponding reading on the ammeter.
- Calculate the differences between the readings and the selected ones. For instance, when 4mA is selected, the actual output current shown on the ammeter is 4.01mA.
- Then, the difference is 0.01mA.
- If the differences are not within tolerance, calibrate the current loop
- The present current loop output is displayed in Window M59. It changes along with flow rate change.
How to know if the instrument works properly?
Enter into M08, if ‘R’ is displayed on the screen, the instrument is working properly, If ‘E’ is displayed, the current loop output is over-ranged. Increasing the range setting in M57 will make the ‘E’ letter disappear. If you do not use the current loop output, you may ignore this error.
- If ‘Q’ is displayed, the frequency output is over-ranged. Increasing the range setting in M69 will make the ‘Q’ letter disappear. If you do not use frequency output, you may ignore this error.
- If an ‘H’ flashes on that place, there could be poor signal received. Please refer to the
chapters on a diagnosis.
- If ‘G’ is displayed, the flow meter is adjusting system gain. This is normal as far as it does
not last long time.
- If an ‘I’ is displayed, it means that there is no signal detected.
- If ‘J’ is displayed, there is a hardware problem. Turn off the power, then, turn on the power again. If the problem remains, refer to Chapter 5 for diagnosis details.