5.5 Adjusting Peristaltic Pump Timers for Proper Chemical Concentration
1. Each peristaltic pump is connected to a timer that must be adjusted to provide the proper
concentration of each specific chemical. The peristaltic pumps are designed to deliver 2.6 milliliters
(.0879 oz.) of chemical per second.
IMPORTANT: The timers must be readjusted for the proper chemical concentration anytime the
type or manufacture of chemical is changed!
2. The timer has 10 switches that will select a predetermined operating time (seconds x 10) for each
peristaltic pump. Multiple switches may be selected for an additive run time to obtain the exact
concentration of chemical recommended by the Chemical Supplier. See Figure 30 and Table 2.
Figure 30 - Peristaltic Pump Timer Table 2 - Timer Selections
NOTE: Time is additive when multiple switches are selected in the on position. Multiply the seconds
labeled for each switch by 10.
EXAMPLE:
• Switch Number 8 and 9 on, all others off.
• Switch 8 (12.8 x 10 = 128 seconds) + Switch 9 (25.6 x 10 = 256 seconds).
• The peristaltic pump will operate for 384 seconds.
• Referencing the Table 3B, 384 seconds will deliver 998.4 ml (33.75 oz.).
SERVICE NOTE: Peristaltic pump hoses should be inspected on a regular basis. Replace every two
years or at any time they show signs of cracking or collapsing, or if they become non-pliable.
Using the Chemical Supplier’s concentration recommendations, select the required run time in seconds
for each of the cleaning chemicals from Tables 3A - 3C.
Sentry II with Auto-Dosing Assembly Operating Instructions 33 Effective April 1, 2000
Switch Number Seconds of Operation
10 51.2 x 10 = 512 sec.
9 25.6 x 10 = 256 sec.
8 12.8 x 10 = 128 sec.
7 6.4 x 10 = 64 sec.
6 3.2 x 10 = 32 sec.
5 1.6 x 10 = 16 sec.
4 0.8 x 10 = 8 sec.
3 0.4 x 10 = 4 sec.
2 0.2 x 10 = 2 sec.
1 0.1 x 10 = 1 sec.
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