User manual HANNA INSTRUMENTS HI 9914

[. . . ] Instruction Manual HI 9914 Wall mounted Fertigation Controller Manufacturers since 1978 These Instruments are in Compliance with the CE Directives 1 Dear Customer, Thank you for choosing a Hanna Product. Please read this instruction manual carefully before using the instrument. This manual will provide you with the necessary information for a correct use of the instrument, as well as a precise idea of its versatility. If you need more technical information, do not hesitate to e-mail us at tech@hannainst. com. [. . . ] Turn on the water supply and start the controller by connecting it to the mains power supply. The HI 9914 controls different status and gives visual information through various LED: - When the dosing pumps are active, the corresponding EC and pH pump LEDs are on. - When the circulation or the feeding pump is running, the corresponding LED is ON. If the alarm condition is still present, the controller goes back in alarm status. When the controller is powered, the actual pH and conductivity values are displayed on the two LCDs in pH and mS/cm units respectively. NORMAL OPERATION When the HI 9914 controller is turned on, the meter performs a status check of the level sensors and provides the commands depending on the input status. All the inputs have a delay of about 1 second in order to avoid wrong commutations caused by the waves. Step 1: At start-up the controller checks the normal level and low-level sensors. · If the tank is empty, both sensors are open and the controller goes to step 2. · If the low-level sensor is closed and the normal level sensor is open (the water level is between low and normal level), the controller goes to step 3. Step 2: The water nozzle is activated (open) and the tank is filled with water. · If the controller remains in this status for more than 30 seconds, an alarm condition occurs. Step 3: The water nozzle is open, the circulation pump is running and the tank is filled with water. When the normal level is reached (the normal level sensor is closed) the controller goes to step 4. 19 Step 4: The water nozzle is closed, circulation pump is running and the Conductivity & pH controls are activated. · If the timer feature is activated, the control is on for a selected period (1-10 minutes) and off for the remaining period until 15 minutes. · If both the conductivity and pH values are good for at least 30 seconds, the controller goes to step 5. · If the normal level sensor remains open for about 15 minutes, the controller goes back to step 3. The Circulation pump is running and the controller waits for user input. This state is signaled on the front panel by FEED OK LED and externally through a 15mA current between the FEED OK and INPUT COMMON pins. · If the water composition is not good, the controller goes back to step 4. · If the normal level sensor remains open for about 15 minutes, the controller goes back to step 3. · If the FILL button (or the external fill button connected between FILL and INPUT COMMON) is pressed while the NORMAL LEVEL sensor is open, then the controller goes back to step 3. [. . . ] If the probe has been left in highly concentrated fertilizer solution and does not seem to have become clean, repeat the cleaning procedure. The cloth has to be made of a soft and nonabrasive material and does not scratch the pins. Note: After performing a the cleaning procedure, rinse the probe thoroughly with distilled or tap water. Troubleshooting · If the controller does not respond properly or constantly reads zero or a value close to it: - Check the probe and cable for cracks and replace it if needed. [. . . ]