MiniWarden/PoolWarden + (PLUS) Operation Manual • www.poolwardentraining.com • 29
The TrueDPD is an option that adds a free chlorine measurement to the PoolWarden and MiniWarden. The
measurement uses the DPD method and is not affected by pH, cyanuric acid, saltwater chlorine generators
or any other variables that affect ORP and amperiometric sensors. For installation instruction please refer
to the installation manual.
Features
t Single and two pool versions
t Uses low voltage power supply, 12 Vdc
t Uses about ¼ cup of pool water per measurement, water is not return back to the pool
t Low cost powder reagent, simply mix with distilled water
t Will automatically add a second drop of reagent if needed
t Will not start a chlorine production cycle if the measurement is 0 (for example if out of reagent)
t Adds free chlorine PPM to the PoolWarden and MiniWarden. Control on both PPM and ORP
t Safety relay command added to disable chlorine feed if the PPM is too high
DPD Bottle Fill
The TrueDPD comes with a 4 ounce bottle for the reagent. Also available are 8 and 16 ounce bottles. Over
time the reagent darkens which can impact the readings. If using the larger bottles please contact us for
instructions on obtaining a liquid reagent.
1. Remove the bottle from the TrueDPD. Hold the lid and twist the bottle to keep the tube from twisting.
2. Rinse out the bottle with distilled water. Make sure to not get any of the liquid from the bottle on your
hands, wear protective rubber gloves.
3. CLEANING: Fill the bottle with tap water and place back into the TrueDPD. Turn the system on and go
to the TrueDPD menu - manual operation menu and run a continuous purge for 60 seconds. This will
clean out the tubes. Remove the bottle and any remaining water.
4. Add 0.5 grams of the DPD powder to the empty bottle using the small supplied spoon. Keep spoon dry.
5. Fill the bottle to the neck with distilled water, no need to fill all the way to the top. If TrueDPD is in a
location over 80 degrees Fahrenheit the DPD mixture will get dark over time. Do not use tap water.
6. Replace the bottle back into the TrueDPD and tighten the lid.
7. IMPORTANT: Prime the DPD pump. From the readings screen press 6 for the TrueDPD status screen
and press 2 “Purge” to start a 3 second on cycle, make sure it turns off - note: if currently in a
measurement cycle pressing 2 will not purge. Observe the liquid progressing down the tube and
entering the measuring chamber. Then press 3 “Meas” to start a measurement cycle.
8. While still in the TrueDPD information screen, press the Up Arrow to set the DPD reagent level, this will
be reported in the data and on the readings screen. The Up Arrow decreases the level by 10% with
each press.
9. When using DPD powder, replace when the bottle is dark (black). Reagent life is approximately 8 days.
The life lowers with increasing temperature, make sure the TrueDPD is not installed in direct sunlight.
10. IMPORTANT: Open chlorine containers can cause premature reagent and equipment failure due to off
gassing of chlorine. Make sure the TrueDPD box is sealed and closed. Proper room ventilation helps.
TrueDPD Information Screen
Press the 6 key from the readings screen to access the TrueDPD information screen.
t CLRv: The clear voltage, must be greater than 3.50 and less than 4.90
volts dc. If the clear voltage is out of this range, the PPM will not be
measured and set to 9.8 PPM to indicate an error condition.
t DPDv: The voltage after the DPD reagent has been added. If the DPDv is
greater than the clear voltage the PPM will not be measured and set to 9.8
PPM to indicate an error condition.
CLRv DPDv PPM P1
4.30 2.45 3.6 c55
4.31 3.45 1.6 v3.98
Err purg meas
TrueDPD Information
Appendix E - TrueDPD Free Chlorine Measurement
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