aquaMAX
TM
– Ultra 370 Series
- 27 -
4-5. Resistivity cell calibration
The initial cell calibration for resistivity is finalized before release from Young Lin factory.
- The resistivity of Ultrapure water is 18.2 M
Ω
cm at 25
℃
.
- The resistivity should have 18.2 M
Ω
cm at 25
℃
at first use or filter replacement. If not, the calibration is
needed.
Get ready for calibration
- Resistivity meter, screwdriver, RS232C connection cable
How to calibrate
- On the Recirculation/Production mode, display Resistivity/Temperature.
- Data acquisition by connecting with external computer is available.
- Measure the resistivity measurement by resistivity meter.
- Adjust a variable resistivity(VR1), to have resistivity measurement values as same as display values.
Remove an ION cell cable connected to JP22, then shot the strip pin(J3) with a jumper pin. Turn the VR2
and measure TP9 through DVM, them make sure you get 0~3.6 V. Take off the jumper pin and connect an
ION cell cable again. Adjust the value displayed on LCD as same as the value from produced water.
