Product Manual

Wall Mounted Ultrasonic Flowmeter---User Manual

4mA calibration is finished. At this time, press again into the standard status of 20mA output,

then calibrate it with the same way for 4mA.

M59 is used to check the present current value of current output, and the value will be varied

with changing of flow rate.

4.4 Analog Voltage Signal Output

By paralleling connecting a 250%/0.25W resistor across the two current output terminals, the

4-20mA can be transferred voltage output of 1-5V.

4.5. Frequency Output

All the series ultrasonic flow meters have Frequency Output functionality. This frequency output

signal, which represents the flow rate, is intended to connect with other instruments.

The Frequency Output is totally user-configurable. Usually, four parameters should be configured.

Enter the lower limit of flow rate in window M68 and higher limit of flow rate in window M69.

Enter the frequency maximum and minimum in window M67.

For example, assume that the flow rate varies in a range from 0m3/h to 3000m3/h, and the

required output signal frequency should be in a range of 200Hz to 1000Hz. The user should enter

0 in M68 and 3000 in M69, and enter 200 and 1000 in window M67.

Please note that the user needs to select the frequency output option (the 24

option, ‘FO output’)

in window M78. The user must also make the OCT hardware connection to the device which is

supposed to use the frequency output signal. Because Frequency output has no its own output

hardware channel, it will borrow OCT’s channel.

4.6 Totalizer Pulse Output

The flowmeter is able to produce a pulse output every time when it reaches a unit flow of liquid.

This pulse could be used by an external pulse counter to accumulate the flow rate.

The totalizer pulse output can only be transmitted through OCT or relay devices. Therefore, it is

necessary to configure the OCT or relay. This can be done in menu M78 and M79. Refer to the

next chapter for detail on M78 and M79.

For example, assume that we need to output the POS totalizer through the relay in pulse form, and

every pulse represents 0.1cubic meter of liquid flow. The following steps must be performed:

1) Select the Cubic Meter(m3) unit in window M32

2) Select the Multiplier factor as’2. ×0.1’ in window M33

3) Select the output option’9. POS INT Pulse’ in window M77.(INT standards for integrated or

totalized)

Note that the totalizer pulse must be set properly. It should be neither too big, or too small. If it is

too large (e.g., long period), the output pulse will be very slow. If it is too small (e.g., short period),

the relay may active too frequently and its lifetime may be shortened. Besides, pulse loss error

may occur. It is recommended to be within 1-60 pulse/minute. You can adjust the pulse period by

selecting different totalizer multiplier factor in M33.