US208M User Manual Before 5.30

US208M User Manual-V20230327The flow ratedisplayed is in litresper minute.How to setProvide 5V DCpower to light on.Open the back cover of the devicePress K1 and K2 together, to enter the menu or para

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    US208M User Manual-V20230327


The flow rate displayed is in litres per minute.

How to set

Provide 5V 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



1. Type=0  frequency counter

2. 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


3. 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;


4. UNT=1, L/min


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)