6 STAGE EXPERT RO/DI SYSTEM
USER MANUAL
Reef Pure RO Systems
©
2018
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TDS METER PROBE PLACEMENT
The HM Digital
DM-1: Dual TDS Monitor is an important tool in monitoring the performance of your RO/DI
system. It is also, being an electronic device, the only part of your RO/DI system which needs to be kept
dry. Make sure when mounting the TDS meter using the included adhesive strips that a location away
from any potential spills and direct sunlight is selected, ideally above your RO/DI system.
While it is up to you where the two probes are installed we highly recommend the below con
fi
guration:
IN Probe:
Installed between the RO membrane and DI resin Stage(s). This will allow you to monitor the
TDS out of your RO membrane to ensure it is operating properly. The TDS reading out of the RO
membrane should be <10 ppm.
OUT Probe:
Installed after the last DI resin stage. The reading after the DI resin should be 0 ppm at all
times. A reading higher than 0 indicates that the resin has been exhausted are requires replacing.
HM DIGITAL
DM-1: DUAL TDS MONITOR - USAGE INSTRUCTIONS
1. Press the “POWER” button to power on.
2. To display the TDS level of the RO
fi
ltered water, slide the switch to the IN side. This reading can be
used to monitor RO membrane performance. When this begins to rise above the usual reading, it is
likely time to replace your RO membrane.
3. To display the TDS level of the product (RO/DI) water, slide the switch to the OUT side. This reading
can be used to monitor DI resin performance. Any reading higher than 0 TDS means you need to
replace your DI resin.
4. The displayed TDS will always be most accurate after approximately 10 seconds of running.
5. Turn off the unit by pressing the “POWER” button. It will automatically shut off after 10 minutes.
It can also be useful to check your tap water TDS occasionally by moving one of the
probes temporarily. Typically though there is no need to continue monitoring the tap TDS
as the reading will seldom vary.
A full manufacturer instruction manual including more detailed installation notes is
included with every TDS meter.
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SYSTEM INSTALLATION
