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● Worn or damaged movement ● The flow rate becomes smaller due to a gradual lack of pressure in the pipeline under working conditions ● Solution: first dismantle the watch body to verify that the movement is normal

 ● Whether it is an industrial frequency disturbance (50HZ), characteristic: a value is displayed that does not change; this value can be calculated according to the following formula q—instantaneous flow rate (m3/h) f — frequency (HZ) K — coefficient (times/m3) ● Whether the wiring is laid in a line slot with strong electricity (220V or

Default address 001, baud rate 9600, n without parity, 8 bits of data, 1 bit of stop Is the instrument wired correctly, connect 24V GND 485A 485B, battery power and two-wire system do not support 485 functions, confirm 24V power supply is normal The instrument communication is based on the MODBUS RTU protocol, note that

● Pulse mode and pulse equivalent can be modified in the parameters, refer to the manual for details ● Pulse active output, PNP, NPN, and OC hardware can be commissioned at the rear terminal board, refer to the manual for details ● Use a multimeter to measure the voltage between FOUT-C and COM, under the

● The blue potentiometer can be adjusted by unscrewing the front cover directly; see picture Left zero, right full 4mA potentiometer on the left On the right is the 20mA potentiometer

● Measure if the voltage supply to the instrument is normal or if the battery is charged ● Consider whether the outdoor installation is damp from water ● Loose circuit board wires ● Circuit board failure return to factory for repair or issue replacement board

(1) Three-wire current, current output is not normal: ● Pay attention to the wiring: 24V, COM (GND), IOUT ● Measure the voltage between IUOT and COM (GND), if there is current, use a multimeter to measure the current again, if not, the board is faulty. (2) Two-wire current wiring, the instrument does not light up

The default address of the instrument is 001, baud rate 9600, n without checksum, 8 bits of data, 1 bit of stop bit, default co-instrument 0 If the battery supply and the two-wire system do not support the 485 functions, the battery can be removed and the 24V supply can be confirmed as normal. The

Whether the customer has moved the parameters Is the installation in accordance with the requirements Whether the flow rate is within the range Is the temperature and pressure display normal, if abnormal check steps refer to 5 or 6 If the instrument is connected to an external power supply or output, remove the cable and

● Whether the customer has set the parameters ● Is the installation in accordance with the requirements ● Whether the flow rate is within the range ● Whether the temperature and pressure are normal if they are abnormal check steps 5 or 6 ● There are many impurities on the strainer or filter at the