1. When there is no signal output from the concentration meter, firstly check the disconnection or short circuit of
the extension cable or whether the working voltage of the concentration meter is normal
2. If the concentration meter is suspected to be malfunctioning, the following methods can be used
Remove the densitometer, measure water and a certain concentration of medium respectively, measure with the
mA current of the multimeter, blue electronic wire: 4~20 output positive and yellow electronic wire: 4~20 output
negative, the current signal should be 4mA, and the measured The current output corresponding to the medium
is normal, otherwise the concentration meter is faulty.
Periodic/timed maintenance (operable by cleaning unit)
PS: we can also supply Auto or manual washing device for optional, if you need, Please let us know
when order.
Wipe the glass of the densitometer probe clean, add 0.3mL of tap water, if the test value is not equal to 4mA,
short-circuit the zero line to clear it.
Concentration meters measuring high temperature, corrosive media or operating under vibration conditions
should be calibrated once every six months.
After the concentration meter has been running for 5 years, an insulation resistance test should be performed,
and the insulation resistance should be above 500MΩ.
Concentration value vs. Refractive Index graph
ZHYQ Sensor&Control Page 5 of 6
