User manual HANNA INSTRUMENTS HI 9835

[. . . ] 6 TAKING MEASUREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 AUTORANGING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 TEMPERATURE COMPENSATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 EC / TDS CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Tap the probe repeatedly to remove any air bubbles that may be trapped inside the sleeve. The "CON" indication starts blinking on the LCD asking for confirmation. If everything is satisfactory, the meter displays the "Stor Good" message and returns to measurement mode. Notes I If the uncalibrated reading is too far from the expected value, calibration is not recognized. The "CON" indication does not appear; the " " and "BUF" symbols blink to signal wrong or contaminated calibration solution. II For best results choose an EC buffer value close to the sample to be measured. 9 TEMPERATURE COMPENSATION Three options of compensating temperature are available: Automatic (Atc): The probe has a built-in temperature sensor; the value of the temperature is used to automatically compensate the EC/ TDS reading using 25 C as reference temperature. Manual (Mtc): The temperature value, shown on the lower LCD, can be manually set by the user with the up and down arrow keys. No Compensation (notc): The temperature reading shown on the lower LCD is not taken into account. The " C" and "%TC" symbols blink when this option is active. To select the desired option press the ATC key until the option is briefly displayed on the LCD. If temperature compensation is active, measurements are compensated using a default temperature coefficient of 1. 90 %/ C. It is possible to select a different temperature coefficient (TC) in the 0. 00 to 6. 00 %/ C range by entering the setup mode and selecting the "tc" item (see SETUP for details). The current temperature coefficient can be quickly viewed pressing ALT+TC. The value is briefly displayed on the lower LCD. 8 III IV V In order to minimize any EMC interference, use plastic beakers. If the setup item "tc" has been set to a different value, when exiting the calibration mode the value displayed on the upper LCD could be different from the nominal buffer value. It is possible to set the cell constant value directly without following the calibration procedure. To set the cell constant enter the setup mode and select "CEL" (see SETUP for details). TEMPERATURE CALIBRATION (for technical personnel only) The calibration is 2 points at 0. 0, 50. 0 C. · The lower LCD displays "0. 0 C"; "BUF" and "CAL" tags appear. · When the reading is stable, "CON" symbol starts to blink. · When the reading is stable, "CON" symbol starts to blink. · Press ALT+CFM to confirm and return to normal operation. N a C l CALIBRATION Calibration is 1-point at 100. 0% NaCl. Use the HI 7037 calibration solution (sea water solution) as a 100% NaCl standard solution. [. . . ] Operation of this instrument in residential area could cause unacceptable interference to radio and TV equipment, requiring the operator to take all necessary steps to correct interference. The metal bands of the probe are sensitive to electrostatic discharges. To maintain the EMC performance of this equipment the recommended cables must be used. Any variation introduced by the user to the supplied equipment may degrade the instruments EMC performance. [. . . ]