Hypertherm HyPrecision Predictive P-15 Operator's Manual page 96

5 – Preventive maintenance
5. Put the TDS meter in the water sample up to the maximum immersion level (5 cm/2 inches). Tap the meter
gently to release air bubbles.
CAUTION
Wait approximately 20 seconds for the reading to become stable.
6. Compare the reading to the TDS table.The optimal range is 0.005% to 0.015% (50 ppm to 150 ppm).
0.002
%
20
ppm
Unsatisfactory
Lower than 0.005%
(50 ppm)
Use nonmetallic or
stainless steel
fittings
7. Rinse the meter in clean, deionized water or filtered water after use.
96
The meter is not waterproof. Do not submerge the unit in water.
0.004 0.006 0.008 0.01
40 60 80 100
Optimal
0.005% to 0.015%
(50 ppm to 150 ppm)
—
HyPrecision Predictive waterjet pump Operator Manual 810120
0.012 .0014 0.016 0.018
120 140 160 180
Satisfactory
0.015% to 0.022%
(150 ppm to 220 ppm)
A reverse osmosis system
can be used to remove TDS
0.02 0.022 0.024
200 220 240
Unsatisfactory
Higher
than 0.022%
(220 ppm)
A reverse
osmosis system
should be used
to remove TDS