User manual EUTECH INSTRUMENTS ALPHA CON 500 2-WIRE TRANSMITTER

[. . . ] Instruction Manual CON 500 LCD Transmitter Conductivity Transmitter with Display lpha CON500 MEAS READY 1413 . µS °C ATC 2-wire Conductivity Transmitter 68X216867 Technology Made Easy . . . Rev 0 11/04 Preface This manual serves to explain the use of the CON 500 transmitter. It functions in two ways, firstly as a step by step guide to help you to operate the transmitter. It is written to cover as many anticipated applications of the transmitter as possible. If there are doubts in the use of the transmitter, please do not hesitate to contact the nearest Authorized Distributor. [. . . ] You have to recalibrate your transmitter every time you change the measuring range since the calibration data of your transmitter will be erased every time a new measuring range is selected. During conductivity calibration, the transmitter allows a calibration window of ± 40% from the measured default reading of the calibration standard. The minimum allowable calibration point is 10% of the full scale reading of the range selected. For best results, select a standard value close to the sample value you are measuring. Alternatively use a calibration solution value that is approximately 2/3 the full-scale value of the measurement range you plan to use. Please refer to Section 6. 2 - Temperature Compensation Setting for temperature calibration procedure. - 11 - Instruction Manual CON 500 5. 3 Conductivity Calibration MEAS A 1-point Calibration is required for this transmitter. If the calibration process is aborted, your transmitter will revert to the previous calibration data. Organize your calibration standard solution in two beakers ­ one for rinsing and the other for calibration. Rinse the electrode in de-ionized water and then rinse with the calibration standard. Dip the electrode to the calibration standard intended for calibration and swirl gently to create a homogenous sample. The upper display will show the measured reading based on the last calibration setting whereas the lower display will show the measured default reading of the standard. Use the or keys to adjust the upper display to the calibration standard value. HOLD 1578 25. 5 µS °C ATC CAL HOLD 1578 1578 µS 4. CAL 5. Note: You can offset the conductivity reading within ± 40% from the default reading of the standard. The minimum allowable calibration point is 10% of the full scale reading of the range selected. 6. 1413 1578 µS Press the ENTER key to confirm the calibration value and to return to the measurement mode. Note: To exit this program without confirming the calibration, press the and keys together (Escape). Note: When there is a calibration error, the buffer icon and ERR annunciator will appear together with a blinking electrode icon. Press both and keys together TWICE to return to the measurement mode. - 12 - Instruction Manual CON 500 6 ADVANCED SETUP FUNCTIONS The advanced setup mode lets you customize your transmitter's preferences and defaults. This transmitter features different sub groups that organize all setup parameters. The sub-groups are: 6. 1 Range and Zooming Selection Setting Your CON 500 transmitter provides six selections of conductivity measurement ranges to suit your process application needs. Zooming selection is available where both the 4 mA and 20 mA output current can be assigned to specific conductivity values for a more refined output. Use the or keys to scroll through the six ranges and press the ENT key to select your desired range. The transmitter will now switch to the zooming selection and display the low zoom value setup. SETUP HOLD SETUP HOLD 2. 3. 1. 9 99 1 µS NOTE: Range 6 selection page will only appear in the setup mode when the cell constant is selected as K = 1. 0 or K = 10. [. . . ] Use the or keys to scroll till LCD displays `ELE' in the upper display. The display will show the current effective cell constant and its range. Press and keys together, to return to the measurement mode. HOLD ELE 2. 3. SETUP K= 1. 000 6 - 21 - Instruction Manual CON 500 6. 10 Reset Function SETUP The reset function lets you choose to either reset the transmitter's conductivity calibration only or conductivity calibration plus all setup functions that you might have changed back to factory default settings. However, the temperature compensation setting, as in Section 6. 2, will remain unchanged. [. . . ]