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VI. System Operation Overview
Description of Menus
NanoTron controllers have three modes of operation, Run, Menu and Force. All menus are circular. Pressing
the DOWN key will display the next line of information on the display.
Run -
This mode is for normal operation. The control relays will only be automatically active in this
mode. In the Run mode, the display will read system values. If an alarm is present, the display
flashes with the alarm status.
The Run menu will display values such as day, time, date and other values depending upon the
features present on the unit. The unit will automatically return to the Run mode if no keys are
pressed for three minutes.
Menu
-
This mode is used to make adjustments to settings and readings on the controller. To access
the Menu mode from the run screen, press the Menu key. Use the up or down arrow to scroll
through the various menus. When you want to access a specific menu, press the Enter key.
Once you have entered a sub-menu you will be able to step through that menu’s options with
the up or down arrow key.
Force -
Relays may be forced on or off for a user defined amount of time. Press the Force key to force
relays on for the time configured in the Menu’s force sub-menu. Press it a second time to force
them off for the same amount of time. Press a third time to go back to automatic Run mode.
Unit returns to the Run mode automatically when the force time has elapsed.
VII. Maintenance
The only required maintenance for normal uninterrupted operation of your Nano-P/R controller is cleaning
of the electrode. ORP and pH sensors have a 6-18 month life depending on installation and will need to be
replaced regularly.
pH and ORP Electrode Cleaning Procedure
1. Remove the pH electrode from the system.
2. Spray with water and/or detergent, using a soft brush to dislodge any fouling.
3. Visually inspect the electrode for signs of damage.
4. Calibrate the electrode while it is in a known solution.
Slow response or non-reproducible measurements are signs that the electrode has become coated or
clogged. The pH glass is susceptible to mounting by many substances. The speed of response, normally
95% of the reading in less than 10 seconds, is dramatically degraded when the pH glass is coated.
To restore the speed of response for a pH electrode, clean the bulb with a high quality detergent, methyl
alcohol or other suitable solvent using a “Q-tip”. Rinse well with distilled water and retest. If the electrode
now responds, but erratically, soak the sensor in 0.1 Molar HCl for 5 minutes. Remove and rinse with water
and place in 0.1 Molar NaOH for 5 minutes. Remove, rinse again and then place the sensor in pH 4. buffer
for 10 minutes before use.
