Additional Monitoring; Monitor The Inlet Pressure; Monitor The Ionic Rejection Of Reverse Osmosis Membrane; Monitor The Production Flow Rate - Wasserlab Micromatic Mode D'emploi

12. Additional monitoring

The equipment monitors the conductivity of the produced water and the working hours of the equipment. Based on this
data, the equipment warns the user of the need to replace the ion exchange resin and the pretreatment cartridges.
This chapter explains additional monitoring that the user can perform to have a better understanding of the equipment
performance.

12.1 Monitor the inlet pressure

Check that the inlet pressure is at least 3 bar

12.2 Monitor the ionic rejection of reverse osmosis membrane.

The ionic rejection of the reverse osmosis membrane should be  90%.
Follow the instructions below to calculate the ionic rejection of the reverse osmosis membrane:

Measure the inlet water conductivity in µS/cm

Measure the osmotized water conductivity in µS/cm

Calculate the ionic rejection percentage:
Ionic rejection (%)=100 * (Conduct. inlet water – Conduct. osmotized water)/ Conduct. inlet water
 Verify the ionic rejection percentage is  90%.
Example:
-
Inlet water conductivity = 450 µS/cm
-
Osmotized water conductivity = 6 µS/cm
-
Calculation: Ionic rejection (%)=100 * (450 – 6)/450 = 98.7 %
-
Ionic rejection 98.7 %

12.3 Monitor the production flow rate

Follow the instructions below to calculate the production flow rate:

With the equipment in production mode, disconnect the tube that connects the equipment to the tank.

When the flow rate stabilizes, measure the time in seconds (t) needed to fill 100 ml of a test tube

Calculate the production flow rate in L/h: Production flow rate (L/h) =360/t.

Measure the inlet water temperature and use Table 12.1 to calculate the normalized production flow rate at
25 ° C.

Verify that the normalized production flow rate at 25 ° C is greater than or equal to the nominal flow rate.
Example:
-
An equipment with a nominal flow rate of 10 L / h takes 30 seconds to fill 100 mL: t = 30 seconds
-
Calculation: Production flow rate in L/h=360/30 = 12 L/h
-
Water temperature = 18.8°C
-
Factor in Table 12.1: Factor=1.251
-
Calculation: Normalized production flow rate at 25 ° C in L / h = 12 * 1.251 L/h =15.01 L/h.
-
Normalized production flow rate at 25 ° C (15.01 L/h)


90% OK


Nominal flow rate (10 L/h) OK
25/31