TM 10-4610-232-12
2-7. PORTABLE TDS METER (Figure 2-17).
Figure 2-17. Portable TDS Mater
a. Purpose and Function.
(1) The portable TDS meter is a portable, hand-held meter used to measure total dissolved solids at water
sampling points. This unit is used to check the in-line TDS meter (para. 2-5b). It allows measuring TDS from each RO
vessel.
(2) The portable TDS meter is read in parts per million (ppm) dissolved solids.
(3) The portable TDS meter is equipped with a scale (5) and range selector (1). Table 2-12 shows range selector
settings, scale readings, and when each is used.
Table 2-11. Range Selector
Range Selector
Each Scale
Setting
Line (ppm)
When Used
S
To find internal standard reading.
10
1
Product from river and lake water.
100
10
Raw rivers and lake water or product from river and lake water.
1,000
100
Raw rivers and lake water or product from sea water.
10,000*
1,000
Raw sea water.
*RANGE EXTENDER (2) must be used.
2-27
