Service manual

11
Instruction for Water Quality TDS Meter (included with Model: RO 585A only) Part No. 578
Specifications:
Range 0 to 9990 ppm (mg/L) EMC Deviation + 1% Temperature Compensation 5 to 50C or 41-122F
Resolution 1 ppm Environment 32F to 122 F Batteries
Accuracy + 2% full scale Weight 2 oz or 85 g Dimension
Features:
• Hold function: Freezes measurements for convenient reading & recording.
• Auto-Off function: Turns off meter after 10 minutes of idle to conserve batteries.
• High operating limit: Measures from 1 to 9990 ppm, when reading is over 999, it converts to x10’
Operation
• Remove the protective cap , then turn TDS meter on, press ON button
• Immerse into water sample up to the about 1 ½ “ from tipwithout touching the bottom of the water sample container
• Stir gently and wait until the display stabilizes, and theTDS meter compensates for the temperature variance automatically.
• To hold the reading, press HOLD, Turn off meter, press OFF button
Battery Replacement
When the TDS mater cannot be switched on or the display fades, pull out the battery compartment and replace two 1.5V batteries, paying attention to
their polarity.
Interpreting the Results
Example:
Reading #1 Reading from Reverse Osmosis water : 30 ppm:: Reading #2 Reading from tap water: 350 ppm
Divide Reading #1 by Reading #2 Reading #1/ Reading #2 = 0.086
one minus the value obtain above the multiply by 100 to get the Rejection of the R.O. membrane or RO system
1-0.086 = 0.914 0.914 x 100 = 91.4 or 91% rejection rate
Your Reading:
Reading #1 Reading from Reverse Osmosis water : ppm
Reading #2 Reading from tap water: ppm
Divide Reading #1 by Reading #2 Reading #1/ Reading #2 =
one minus the value obtain above the multiply by 100 to get the Rejection of the R.O. membrane or RO system
1- ( ) = x 100 = % (rejection rate)
• A new RO system or a new membrane should have rejection rate of 90 to 95%
• Over years of usage the membrane performance will degrade, and membrane should be replaced when rejection rate reaches 80% or below.
RECHARGING TANK PROCEDURE
PROBLEMS:
• When you turn on the spigot you get small water pressure and water flow.
• When you turn on the spigot, only a quick burst of water comes out of the system, then it dies down to trickles.
• When you turn on the spigot in the morning, you only can get less than a gallon of water.
If you have above problems, you should recharge the tank. The tank should have about 7 psi of air pressure when it is completely
empty. The storage tank has a water bladder inside, and it is surrounded by compressed air, so when you turn on the spigot, the
compressed air would squeeze or compress the water bladder to force the water out of the tank. When the tank is full the tank pressure
can reach about 35 to 50 psi depending on your feed water pressure, but to accurately recharge the storage tank, you should empty the
tank then set the air pressure to 7 psi.
TOOLS NEEDED: An air compressor or air pump (like a bicycle tire air pump . An air pressure gauge that is able to read less than
10 psi. Adjustable wrench or 9/11” wrench
STEPS:
1. Shut off the water supply to the RO system. Turn on the spigot to allow water to run until it stops (you can collect the water if you
want)
2. Check to see if there is still water in the storage tank by lifting the tank. If the tank feels heavy, that means you need to recharge
to tank, then continue the following steps. If the tank feels light, that means you don’t need to recharge your storage tank at this
time.
3. Locate the air valve on the side or on the bottom of the tank. It looks like the air valve on tires.
4. Use an air compressor or air pump to pump air into the tank. Keep the spigot on while pumping air, so that all water inside the
tank can be purged out. Don’t over charged it, just keep around 20 psi.
5. After all water is been discharged, use an air pressure gauge to check the tank pressure.
6. The tank should have 7 psi of pressure when it’s empty. Add or purge air if necessary.
7. Turn the feed water valve back on, and turn off the spigot to allow refilling of the tank. It may take couple hours to refill the
storage tank.
8. Finished
NOTE: If after few days of running the system, the problem comes back, then you may need to replace a new tank.