Appendix C Aqua-Sensor Guidelines - Culligan CSM Series Installation, Operating And Service Instructions

Appendix C Aqua-Sensor Guidelines

Aqua-Sensor Application Guidelines
Parameter
Hardness (gpg as CaCO )
3
Solube iron (ppm as Fe)
Manganese (ppm as Mn)
Hardness vs Salt Dosage
TDS to Hardness Index
Temperature, °F
Alum and phosphate
Commercial cell: distance betwen sensing and reference cell pairs 6 inches (See Note 2)
Hardness (as CaCO
Table 18. Resin Bed Depths and Estimated Capacity per Inch at Various Salt Dosages
Model Tank Resin
Size Qty.
150 20x54 5
210 24x54 7
300 30x60 10
450 30x60 15
600 36x60 20
750 42x60 25
900 42x60 30
Notes:
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 represen-
tation of actual capacity per inch of bed depth for operational purposes.
96 Culligan® CSM Series Softeners
Table 17. Hardness vs. Salt Dosage
) Recommended Salt Dosage (lbs/ft
3
7 - 10
10 - 15
15 - 25
25 - 50
50 - 75
75 - 99
Depth Grains Capacity
of Resin per inch (10 lbs/ft
(in.) salt dosage)
27.5 4545
26.7 6554
24.4 10227
36.7 10227
34.0 14726
31.2 20044
37.4 20044
7 - 99 (See Notes 1 and 2)
< 2 (See Note 3)
< 0.5 (See Note 4)
See Table 17 and Note 2
TDS hardness (as CaCO
10% of TDS; see Note 5)
Any within equipment's operating range
Anecdotal evidence indicates potential foulant; effect has not
been confirmed experimentally
5 - 6
6 - 8
8 - 9
9 - 11
11 - 12
12 - 16
Grains Capacity Reserve Capacity
per inch (6 lbs/ft @ 10 lb Salt
3 3
salt dosage) Dosage (grains)
3636
5243
8181
8181
11781
16035
16035
Value
) < 10 (i.e. hardness must be at least
3
)
3
Reserve Capacity
@ 6 lb Salt
Dosage (grains)
6
27270 21816
39324 31458
61359 49087
61359 49087
88357 70686
120264 96211
120264 96211
96 Cat. No. 01016370
6