0.1 cubic meter of liquid flow. Assume also that the pulse output is connected to an internal
Buzzer. With every 0.1 cubic meter of flow, we need the BUZZER to beep for a while. In
to achieve this, the following steps must be performed:
(1)
Select the Cubic Meter (m
3
) unit in window M32.
(2)
Select the Multiplier factor as ‘2. X0.1’in window M33.
(3)
Select the output option ‘9. POS INT Pulse’ in window M77. (INT stands for totalized)
3.17 How to produce an alarm signal
There are 2 types of hardware alarm signals that are available with this instrument. One is the
Buzzer, and the other is the OCT output.
Possible triggering sources of the alarming events for both the Buzzer and the OCT output:
(1)
There is no receiving signal
(2)
The signal received is too weak.
(3)
The flowmeter is not in normal measurement modes.
(4)
The flow direction is changed.
(5)
Overflow occurs at the Frequency Output
(6)
The flow is out of the specified range.
There are two alarms in this instrument, #1 alarm and #2 alarm. They can be configured in
windows M73, M74, M75 and M76.
For example, assume we need the Buzzer to start beeping when the flow rate is less than 300
m
3
/h and greater than 2000 m
3
/h. The following setup steps would be recommended.
(1)
Enter flow rate lower limit 300 in M73 for #1 alarm,
(2)
Enter flow rate upper limit 2000 in M74 for #1 alarm,
(3)
Select item ‘6. Alarm #1’ in M77.
3.18 How to use the built-in Buzzer
The built-in buzzer is user-configurable. It can be used as an alarm. Use M77 for setups.
3.19 How to use the OCT output
The OCT output is on/off type. It is user-configurable. For example, you can set the OCT
output to be a pulse signal for flow accumulation.
Use M77 for the setup.
Notice that the Frequency Output shares the same OCT hardware.
The OCT output is wired to pin 6 (for positive) and pin 5 (for ground) of the RS-232
connector. Refer to section §6.1 for more details.
3.20 How to modify the built-in calendar
No modification on the built-in calendar will be needed in most cases. The calendar consumes
an insignificant amount of power. Modification will be needed only when the battery is totally
exhausted, or when the replacement of the batteries takes a long time so that the original clock
data get lost.
Press the ENT key in M61 for modification. Use the dot key to skip over the digits that need
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