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HANNA INSTRUMENTS HI 9914 (2476 ko)
Manual abstract: user guide HANNA INSTRUMENTS HI 9914
Detailed instructions for use are in the User's Guide.
[. . . ] 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. [. . . ] 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. When the low level is reached, the controller goes to step 3. · 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. The Conductivity control has the priority over the pH control. · 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. Step 5: The Conductivity & pH values are good. 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 user input command is active (the contact is closed between the USER INPUT and INPUT COMMON pins), the controller goes to step 6. The control of Conductivity and pH is inhibited. [. . . ] : - The cable may be shorted or the probe broken. · If the response seems sluggish: - Follow the above cleaning procedure. · If there are anomalies such as fluctuating numbers: - Ensure that the probe has been properly mounted and constantly lies in a well filled with solution. 31
- Air bubbles also disturb measurements and the probe should be installed in such a way as to minimize them. [. . . ]
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