conversions to ppm, TDS, grains of salt in this flyer

828 Davis Rd., League City, TX 77573
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Typical Values of Electrical Conductivity and Resistivity of Soils and Waters measured with LandMapper
LandMapper is the only device you will need to reliably measure electrical properties in wide range of conductivities: from ultra-pure water and rocks to salty brines
and ocean waters!
Hand-held and portable, LandMapper utilizes the most accurate 4-electrode contact method, uses one 9-volt battery and can measure down to 10 m (30 ft).
Air
Dry Granite/Gabbro
Ultra-pure Water
Distilled Water
Non-saline Sandy Soil
Non-saline Silt Soil
Non-saline Clay Soil
Nonsaline water
Saline water
Slightly saline
Medium saline
Highly saline
Very highly saline
Brine
Atlantic Ocean
Great Salt Lake
Dead Sea
Electrical
Resistivity, ER
(Ohm m)
Total dissolved
solids, TDS
(ppm)
- reading of non-connected Landmapper =>
-5
6
10
10
N/A
-6
-2
5.6 * 10
178,571
3.6 * 10
0.02
500
12.8
-5
0.01 - 1*10
100-10,000
N/A
0.05-0.5
20-200
N/A
0.1 - 2
5-100
N/A
<0.7
>143
<500
0.7-47
0.24-143
500-30,000
0.7-3
500-2,000
3.33
3-6
2,000-4,000
1.67
6-14
4,000-9,000
0.71
14-47
9,000-30,000
0.21
>47
<0.24
>30,000
43
0.23
27,520
158
0.06
101,120
-2
~516
2 * 10
330,000
Measuring Mode:
Display reads:
Base unit
Measuring limits:
Unit modifiers displayed
3
K - kilo Ohm m = 10 Ohm m
-9
n - nano S/m = 10 S/m
-6
mk - micro S/m = 10 S/m
-3
m - milli S/m = 10 S/m
Salinity of Lakes is taken from http://www.duluthstreams.org/understanding/param_ec.html
EC (conductivity)
000 K1*C=
S/m
-6
ER (resistivity)
000 K1*R=
Ohm m
6
10 – 10 S/m
0.1-10 Ohm m
n, mk, m
~390n
1000n
5.6mk
2m
1m-1mk
5m-50m
10m - 200m
< 70m
K
~2560K
1000K
178.5K
500
100 - 10K
20-200
5-100
143
300m
600m
1.4
4.2
>4.7
4.3
15.8
51.6
3.33
1.67
0.71
0.21
<0.24
0.23
0.06
-4
2 * 10
EC 
1
ER
ER 
range of reliable measurements with
LandMapper ERM-02
Typical
Water or Soil*
Salinity
Electrical
Conductivity,
ECw (dS/m)
1
EC
EC <=> ER conversions only valid for base units S/m <=> Ohm m!
Soil salinity is routinely evaluated in the labs from electrical conductivity of liquid soil saturation extract (ECe). The resulted total salinity is reported either directly in conductivity
units (dS/m) or converted to TDS (total dissolved solids) concentration in ppm (parts per million) using formula:
1 dS/m = 640 ppm = 640 mg/L = 0.64 g/L = 0.064% = 45.7 grains per gallon

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