User manual HANNA INSTRUMENTS PCA 310

[. . . ] Instruction Manual PCA 310, PCA 320, PCA 330 Chlorine, pH, Temperature, ORP Analyzers w w w. c o m 1 Dear Customer, Thank you for choosing a Hanna Product. This instruction manual has been written for the following: PCA 330 ­ Chlorine, pH, temperature, ORP analyzer. PCA 320 ­ Chlorine, pH, temperature analyzer. [. . . ] pH DOSING The PCA 320 and PCA 330 can use ON/OFF or proportional dosing algorithm to stabilize the pH . The analyzer has a relay for acid or alkali dosing and also the 4-20 mA output could be configured as a dosing output. To select the type of pH dosing edit the "pH Menu" - "Dosing Control pH" - "pH Control" line. The available options are Proportional and ON/OFF . The acid or alkali dosing is set in the "pH Menu" - "Dosing Control pH" - "Dosing Type". When "Acid" is selected, the analyzer will dose when the pH value is higher than the setpoint and when "Alk" is selected, the analyzer will dose when the pH value is lower than the setpoint. PROPORTIONAL DOSING The proportional dosing pH Relay off Setpoint algorithm turns on the Proportional dosing dosing relay proportionally with the difference Relay on between the setpoint and measured value. time The equation for determining the time for relay on is: dosing time = (set value - measured value)*Period/Delta 42 delta Note: Note: Note: The analog output will have the value: analog output [mA] = 4 + 16 * dosing time/Period [mA] If the measured pH is lower (or higher for acid dosing) than setpoint minus (plus) delta, the dosing will be continuous until the pH period elapsed. To modify the dosing setpoint, enter the "pH Menu" - "Dosing Control pH" edit the "Setpoint" line. The value must be between 2. 00 and 12. 00 pH. To modify the Delta, edit the "Delta" line. The available values are 0. 1, 0. 2, 0. 3, 0. 4, 0. 5, 0. 6, 0. 7, 0. 8, 0. 9, 1, 1. 5, 2. To modify the dosing time edit the "Period" line. The allowed values are between 3 and 120 seconds. The period is related only to the dosing process. The pH measurement take place with a higher rate. The speed of the analyzer could be modified by changing the regulator period. A new decision regarding the pH dosing is taken only after one period elapsed. The Setpoint and Delta could be quickly consulted on one pH measuring panel. ON/OFF DOSING If this mode is selected the Period and Delta has no effect. The algorithm will use only Setpoint and Hysteresis. For alkaline dosing, the pH relay will stay on until the Setpoint pH increases to the setpoint plus hysteresis value, then the relay stays off until the pH decreases to a value equal to setpoint. time For acid dosing, the relay will stay on until the pH decreases to the setpoint minus hysteresis value, then the relay stays off until the pH increases to a value equal to setpoint. [. . . ] Change the reagent or reset the reagent counter. "Cl Calibration Old" on LCD and "Cl Cal" on SMS Cell calibration is older than 1 months. "Reagent Expired" on LCD and "Reag Exp" on SMS Reagent is older than 3 month. Change the reagent and reset the reagent counter. [. . . ]