The flow rate displayed is in litres per minute. The total flow displayed is in Litres. (By pressing K2 to shift the display)
How to set
Provide 12V DC power to light on.
Open the back cover of the device
Press K1 and K2 together, to enter the menu or parameters
Then press K1 to select the digit
Press K2 to increase the number
Parameters (US308MT may not have alarm function, although the parameters are all included.)
1. ALH – higher limit alarm value
ALH =500.0 means the alarm will go off when the flow rate is greater than the alarm value
2. ALL – lower limit alarm value
ALL=0.1 means the alarm will go off when the flow rate is lower than 0.1 litres/min
ALL=0, function off
3. TYPE = frequency (always in 0, factory default, no need to change)
4. Dot – Decimal (0-3)
Example: Dot = 1 means one decimal
It is related to K1 (constant)
If Dot = 1, K1 = 10
If Dot = 2, K1 = 100
5. FILTR (FLTR) – Filter index, the bigger the FILTR value, the slower meter reads the frequency signal.
Meter (device) reads frequency signal every single second.
6. K1 – constant (see point 4); K2 – constant to calibrate flow rate;
For example: the formula of the flow sensor is F=8Q, then K1=1, K2=8;
7. ACC: Total amount alarming value. When ACC=0, Function off.
8. UNT: UNT=0, the display unit is L/Second, UNT=1, L/min; UNT=2, L/hour.
How to calibrate
Use K2 (constant) to calibrate the flow rate
Frequency = K2 x Flow rate
If K2 set on 10, and the flow rate is 4 lts/min
To calibrate to 8 lts/min, change K2 to 5 (10x4/8)
To mute the alarm for flow rate
ALH =999.9 and ALL =0
To mute the alarm for total volume
ACC=0
To hide total volume display
ACC=0