User manual HANNA INSTRUMENTS PCA 321

[. . . ] Instruction Manual PCA 311, PCA 321, PCA 331 Bromine, pH, Temperature, ORP Analyzers w w w. This instruction manual has been written for the following: PCA 331 ­ Bromine, pH, temperature, ORP analyzer. The analyzers have features such as: automatic bromine measurement, pH, temperature and ORP measurement, bromine and pH dosing regulator, selectable sampling periods, alarm system, data link through GSM network, user friendly interface, serial communication through RS485, recorder output, 4-20mA dosing output, Nema 4X enclosure. The ordering code for bromine analyzers is: PCA 3a1-b a= 1 - Bromine analyzer 2 - Bromine, pH and Temperature analyzer 3 - Bromine, pH, Temperature and ORP analyzer 1 - 115V AC 50-60Hz 2 - 220V AC 50-60Hz b= Please read this instruction manual carefully before using the instrument. [. . . ] The acid/alkali dosing is stopped and the SYSTEM ERROR LED starts blinking. The dosing could be resumed only by restarting the controller. Hysteresis Relay on Relay on Relay off Relay on Relay off 43 To enable this protection, edit "pH Menu" - "Dosing control pH" - "Max. ALARMS Two alarm setpoints are available for pH: Alarm high and Alarm low. The ALARM LED and relay are activated when the pH value is higher than Alarm high or lower than Alarm low. To modify the alarms setpoints, enter the "Alarms pH" menu and edit "Alarm Hi" value or "Alarm Lo" value. To modify the alarms status, enter the "pH Menu" - "Alarms pH" menu and edit "Alarm Hi" status or "Alarm Lo" status. The Alarm high Setpoint and Alarm low setpoint could be quickly consulted on one pH measuring panel. When an alarm is disabled, the --. -- is displayed instead of alarm value. Note: pH CALIBRATION (PCA 321, PCA 331) It is recommended to perform pH calibration when the probe is replaced and after any cleaning action. The analyzer can perform 2 points calibration, 1 point calibration or process pH calibration. To perform any pH calibration enter in "pH Menu" - "Cal. Date :01/01/01 In this menu the last calibration date is displayed on the "Cal. If the probe calibration is older than 1 month, a warning is displayed. Initial Preparation Pour small quantities of pH 7. 01 (HI 7007) and pH 4. 01 (HI 7004) or 10. 01 (HI 7010) solutions into individual beakers. 44 For accurate calibration use two different beakers for each buffer solution, the first one for rinsing the probe and the second one for calibration. If necessary, disconnect the probe from analyzer to prevent the damage of the probe cable. ONE POINT CALIBRATION Immerse the pH probe into the buffer solution Probe (e. g. pH 7. 01) using "UP" or "DOWN" arrow keys and confirm. Buffer 1 pH: 7. 01 During this period, Measured pH: 7. 02 the "Wait for stabi- Temp. Note: If the read value, calculated with the default offset and slope, is different from the expected value with more than 1. 15 pH (i. e. values" appears also if the pH probe is defective or not connected. The problem could be identified if the buffer set value is compared with the actual read value (first and second line of the display). If the probe is inserted in the appropriate buffer, the measuring cycle is restarted automatically and message "Wait for stabilize" is displayed again. [. . . ] "Low ORP" on LCD and "L ORP" on SMS The ORP is under the Alarm Low setpoint. "High Temperature" on LCD and "H Temp" on SMS The Temperature is over the Alarm High setpoint. "Low Temperature" on LCD and "L Temp" on SMS The Temperature is under the Alarm Low setpoint. WARNING MESSAGES "Dirty Cell" on LCD and "Drt Cell" on SMS The light level is too low. [. . . ]