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FDT-25W Wall Mounter Ultrasonic Flowmeter
22
The RELAY is of SPST(Single pole, single throw) type. It is rated for 110VAC max and have a
current rating of 0.5A resistive load.
It highly recommended that a salve relay to be utilized whenever a large resistive load or
inductive load is to be controlled.
Note. In order to make the user interface compatible with the former version7, the name
RELAY was used other than OCT2, but in fact it is an OCT output.
M80
Window for selecting the trig signal for the built-in batch controller. Available trig sources:
0. Key input
(press ENT key to start the batch controller)
1. Serial port
2. AI3 rising edge
(when AI3 receives 2mA or more current)
3. AI3 falling edge
(when AI3 stop receiving 2mA or more current)
4. AI4 rising edge
(when AI3 receives 2mA or more current)
5. AI4 falling edge
(when AI3 stop receiving 2mA or more current)
6. AI5 rising edge
(when AI3 receives 2mA or more current)
7. AI5 falling edge
(when AI3 stop receiving 2mA or more current)
8.Timer periodically
(define the start time and interval time in M51)
9.Timer daily
(define the start time and interval time in M51)
For the input analog current signal, 0 mA indicates “0”, 4mA or more indicates ‘1’.
By selecting item #8, the batch totalizer can be started periodically by the internal timer located
at Menu51. When the batch totalizer is full, a signal which indicate the batch is full can be direct
to either the OCT or the RELAY terminals to stop the pump or other devices.
By selecting item #9, the batch totalizer could act as totalizer witch runs for only a period of the
day so that a alarm signal could be produced if the total flow during that time period is over a
certain amount of. For example, if you want a alarm signal which stand for the total flow is over
100 cubic meters during the period of every day from 20:00 to 06:00, setups is like
M51 start time =20:00:00
M51 interval =10:00:00
M51 log times =9999
(means always)
M80 select item #9
M81 input 100
(Unit is defined in M30,M31,M32)
M81
The built-in batch controller
Set the flow batch value(dose)
The internal output of the batch controller can be directed either to the OCT or the RELAY
output circuits.
M81 and M80 should be used together to configure the batch controller.
Note: Because the measuring period is 500mS, the flow for every dos should be keeping at 60
seconds long to get a 1% dose accuracy.
M82
View the daily, monthly and yearly flow totalizer and thermal energy totalizer value.
The totalizer values and errors for the last 64 days, 32 last 32 months and last 2 years are
stored in the RAM memory, To view them, use the ‘ENT’ and ‘UP’ ‘Down’ keys.
M83
Automatic Amending Function for automatic offline compensation.
Select ‘YES’ to enable this function, select ‘NO’ to disable it.
When the function is enabled, The flow meter will estimate the average flow uncounted (or
‘lost’) during the offline session and add the result to the totalizer.
The estimation of the uncounted flow is made by computing the product of the offline time
period and the average flow rate, which is the average of the flow rate before going offline and