User manual EUTECH INSTRUMENTS ALPHA CON 100 REV 1.1

[. . . ] Alpha CON 100 C/CX Conductivity Controller / Transmitter INSTRUCTION MANUAL Technology Made Easy . . . 68X103704 rev 1. 1 Jan 2001 Preface This manual serves to explain the use of the Alpha CON 100 Conductivity Controller/Transmitter. The units covered are Alpha C and CX Conductivity Controller/ Transmitter. The instruction manual functions in two ways: first, as a step by step guide to help you operate and understand the operation of the unit and second, as a handy reference guide. The information presented in this manual is subject to change as improvements are made, and does not represent a commitment of Eutech Instruments Pte Ltd. [. . . ] 2. Calibrating for Conductivity Measurement The CAL COn menu Enter this menu by pressing the MODE key twice to the "SEt" display from the measurement mode. If the password has been set earlier, key in the password using the method described in section 4. 1. After you set the correct password, you can see the "CAL" and "COn" display blink alternately. Dip both the Conductivity electrode and temperature probe in the standard solution NOTE: The Conductivity standard solution should have a conductivity value between 40% to 100% of its full scale range selected 3. 4. 10 5. When "CAL COn" displays, press ENTER key to view the default cell constant at 100%. ENTE Use and keys to scroll to SETUP the standard's Conductivity value o at 25 C. Otherwise an error message "CAL" and "Err" MOD alternatively blinks to indicate ENT out of calibration range. Press ENTER key to complete the calibration, and you will return to "CAL" and "COn" menu. Press MODE key and it brings EN you to the Measure mode. CAL COn CEL 100 SETUP NOTE : Gently stir the electrode in a container filled with calibrating standard, and ENSURE that no bubble is trapped during the calibration process to avoid erroneous reading. IMPORTANT : The correct Temperature Coefficient should be selected prior to Conductivity calibration. (Refer to Section 5. 5 for Setting Temperature Coefficient). CEL SETUP MO EN 99 SETUP MO EN 11 5. 3 Calibrating the Controller for Temperature Measurement 5. 3. 1 The CAL °C menu 1. MODE Enter this menu by pressing MODE key twice to the "SEt" ENTER display if you are in SETUP measurement mode. If the password has been set earlier, MODE key in the password using the ENTER method described in section SETUP 4. 1. After you set the correct password, you see the "CAL" MODE and "COn" display blinks ENTER alternately. Press key twice, SETUP the display shows "Hi" "SEt" blinking alternately. Press ENTER key to access the Hi SET menu and the display shows the last Hi SET value or default (90% of Full Scale). You can press MODE key (as an ESCAPE key) to revert to the measurement value if ENTER is not pressed; the set value is not stored into memory. ENTER SEt MODE 1. Hi 900 14 5. 4. 2 The Hi HYS Menu 1. Enter this menu by pressing the MODE key to the "SEt" display if you are in the measurement mode. If the password has been set earlier, key in the password using the method described in section 4. 1. After you set the correct password, you see the "CAL" and "COn" display blinks alternatively. Press key thrice, the display shows "Hi" "HYS" blinking. Press ENTER key to access the Hi HYS menu and the display shows the last Hi HYS value or default (2% of Full Scale). You can press MODE key (as an ESCAPE key) to revert to the measurement value if ENTER is not pressed; the set value is not stored into memory. HYS SETUP MODE ENTER Hi SETUP MODE ENTER 02 SETUP MODE ENTER NOTE : The maximum value of Hysteresis is 4% of its Full Scale (FS) selected. [. . . ] In cases where the Conductivity values fluctuate close to the high or low setpoints, the relays will continuously switch on/off very quickly and may cause problems to the linked devices. The hysteresis band allows you to set an allowable range of fluctuations to prevent the relays from activating and deactivating too quickly. It is not possible to set the high set point lower than the low set point and vice versa (taking the hysteresis band into consideration). For example, when the high set point is 8. 50 mS and the high hysteresis band is set at 0. 40 mS, then the low setpoint cannot be set at higher than 8. 50 - ½ Hi HYS. [. . . ]