Product Manual

Wall Mounted Ultrasonic Flowmeter---User Manual
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Notice the Frequency Output shares the
same OCT hardware. When used as Frequency Output, the OCT cannot be used for other purpose
(neither alarm signal nor totalizer pulse signal).
The OCT has two wiring terminals, terminals 28 and 29. Terminal 28 is positive and terminal 29 is
negative. Be careful of the polarity. An external DC power supply VX and an external pull-up
resistor Rs are needed for using the OCT (Figure 3). Vx can be from +8VDC to +24VDC. Rx can
be from 1KOhm to 10KOhm. The OCT can drive an alarm, pulse counter, frequency counter, etc.
It can also be used to drive a relay, which operates a valve system, for instance.
Refer to menu M78 for OCT configuration.
4.9. Relay output
The relay output is a single-pole Single-throw (SPST), normally ON output device. Its load
current is 1A at 125VAC or 2A at 30VDC.
The relay output is user-configurable and can be configured as an ON/OFF type alarm signal or a
totalizer pulse signal. Its signal is sent to terminals 30 and 31, which can be connected to a remote
counter or alarm device (Figure 4). Refer to menu M79 for relay configuration.
4.10. Simulation Run Status
The new version flowmeter has a function of simulation run status. This function can help the
flowmeter communication and other function tested without installing transducers. The detailed
method is as below:
Input ‘0’ in window M11, the flowmeter will display flow velocity=1.23456m/s (4.0504 ft/s),and
display‘R’. If request instantaneous flow rate =X, just input ‘-X’ in window M44.
4.11. RS232/RS485 port
The RS485 port is isolated, and has two terminals:RS485+ and RS485-. RS485 port is hardware
channel of communication protocol.
For RS232 port, users can use a RS232-RS485 port.
For detailed communication protocol contents, please refer to manual of MODBUS and
other protocol separately.
4.12. Analog Input of Pressure and Level
The flowmeter has three analog inputs modules built-into its hardware system, AI3-AI5, which
can be connected to analog sensors to measure physical quantities, such as temperature, pressure,
etc. By combining the flow rate information, the flowmeter can provide very valuable information
for resources management and process control.