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Aqua-Sensor Application Guidelines
Parameter
Hardness (gpg as CaCO3)
Soluble iron (ppm as Fe)
Manganese (ppm as Mn)
Hardness versus Salt Dosage
TDS to Hardness Index
Temperature, °F
Alum and phosphate
Commercial cell: distance between
sensing and reference cell pairs
Hardness vs. Salt Dosage
Hardness (gpg as CaCO3)
7-10
10-15
15-25
25-50
50-75
75-99
Resin Bed Depths and Estimated Capacity Per Inch at Various Salt Dosages
Table 13.
Model
Tank
Resin
Size
Qty
HE-060
14x47
2
HE-090
16x53
3
HE-120
16x65
4
NOTE
1.
Although the Aqua-Sensor device has been used successfully on water with hardness as low as 3 gpg, there is an increased
risk of missed signal (no regeneration) when the hardness is less than 6 gpg.
2.
For each tank diameter, there is a specific volume of resin in the space between the cell pairs. The capacity of that resin is
influenced by hardness and salt dosage. Any combination of flow rate and hardness that causes the hardness front to pass
through that volume of resin in less than 6 minutes will result in the sensor failing to detect the need to regenerate. In general,
the volume of resin between the cell pairs on commercial units will permit a proper signal at or below the continuous flow
rating when raw water hardness is less than 50 gpg. At higher hardness levels, it may be necessary to reduce the flow rate to
assure adequate sensor signal duration.
3.
If precipitated or bound iron is present it must be removed before the softener.
4.
Manganese can deposit on the sensor electrodes, particularly on the upper pair, causing missed signals (no regeneration).
Periodic cleaning may be needed to maintain satisfactory performance.
5.
Adequate signal strength has been demonstrated at ratios as high 14 but signal strength diminishes with decreasing TDS to
hardness index.
6.
Amount shown is based on the distance between the referencing cell pairs. Reserve capacity at salt dosages less than 15 lbs
per cubic foot are shown for reference purposes only and may not provide adequate representation of actual capacity per inch
of bed depth for operational purposes.
Cat. No. 01024821
Appendix A Aqua-Sensor Guidelines
Table 11.
Aqua-Sensor Application Guidelines
7 - 99 (See Notes 1 & 2)
< 2 (See Note 3)
< 0.5 (See Note 4)
See Table 18 and Note 2
TDS hardness (as CaCO3) <10 (i.e., hardness must be at least 10% of TDS; see Note 5)
Any within equipment's operating range
Anecdotal evidence indicates potential foulant; effect has not been confirmed
experimentally
6 inches (See Note 2)
Table 12.
Resin Bed Depths and Estimated Capacity Per Inch at Various Salt Dosages
Depth of
Grains Capacity
Resin (in.)
per inch (10 lb/
ft³ salt dosage)
22.5
2227
25.8
2909
34.4
2909
Value
Hardness vs. Salt Dosage
Recommended Salt Dosage (lbs/ft3)
Grains Capacity
Grains Reserve
per inch (6 lb/ft³
Capacity@10 lb/
salt dosage)
ft³ salt dosage
1782
2327
2327
5-6
6-8
8-9
9-11
11-12
12-16
Grains Reserve
Capacity@ 6 lb/ft³
salt dosage
13363
10690
17453
13963
17453
13963
Aqua-Sensor Guidelines
65
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