User manual HANNA INSTRUMENTS HI 24

[. . . ] HI 23 / HI 24 Series Wall-mounted, Microprocessor-based, Conductivity and TDS Process Controllers Instruction Manual 1 Dear Customer, Thank you for choosing a Hanna Product. This instruction manual refers to the following products: HI 23211- EC controller with dual setpoint, ON/OFF control and analog output HI 23212- EC controller with dual setpoint, ON/OFF control and RS 485 port HI 23221- EC controller with dual setpoint, ON/OFF and PID control, and analog output HI 23222- EC controller with dual setpoint, ON/OFF and PID control, and RS 485 port HI 24211- EC and TDS controller with dual setpoint, ON/OFF control and analog output HI 24212- EC and TDS controller with dual setpoint, ON/OFF control and RS 485 output HI 24221- EC and TDS controller with dual setpoint, ON/OFF and PID control, and analog output HI 24222- EC and TDS controller with dual setpoint, ON/OFF and PID control, and RS 485 port = 1, for models with 115 Vac power supply 2, for models with 230 Vac power supply TABLE OF CONTENTS PRELIMINARY EXAMINATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 MAIN FEATURES OF DIFFERENT MODELS . . . . . . . . . . . . . . . . . . . . . . . . . 5 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 MECHANICAL DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 32 Offset Calibration To obtain accurate readings, use the calibration solution in the selected range and closer to the values to be measured. · To perform the EC or TDS calibration enter the calibration mode, by pressing CAL and entering the password. · After the correct password is entered, the control actions stop and the primary LCD will display the first EC or TDS calibration value, with the "CAL" indicator blinking. The secondary LCD displays the temperature. Note If the wrong password is entered the system reverts back to normal operation, displaying EC or TDS values. · 0 is the default value for the 1st calibration point. Dry the conductivity probe and leave it in air. · Only when the reading is stable the "CAL" indicator will stop flashing (after about 30 seconds) and the "CFM" indicator will start blinking. · Press CFM to confirm the calibration point; the primary LCD will display the second expected buffer value. If the zero calibration cannot be performed, "ERROR" will blink. Cell constant calibration · Select the solution value on the primary display by pressing or if the selected range has two possibilities (e. g. · Immerse the EC/TDS probe with the temperature sensor in the selected solution. The level of solution must be higher than the holes of the EC/TDS probe sleeve. Tap the EC/ TDS probe repeatedly on the bottom of the beaker and stir to ensure that no air bubbles are trapped inside the sleeve. 33 · When the reading is stable, "CAL" will stop flashing (after about 30 seconds) and "CFM" indicator will blink. · Press CFM to confirm the calibration point; if the reading is close to the selected solution, the meter stores the reading. If the reading is not close to the selected solution, "ERROR" will blink. CELL CONSTANT DIRECT SELECTION Whenever the EC/TDS probe cell constant is known, it is possible to directly calibrate the meter using that value. · Press CAL to enter calibration mode. · Press LCD to display the current cell constant on the primary LCD (factory default value is 2. 000 cm-1). A 2-point calibration is always suggested. However the EC/ TDS calibration can also be performed at 1 point. To calibrate offset only, just press CAL after confirmation (with CFM) of the zero reading; the meter will return to normal operational mode. To have the cell constant calibrated first, press the up or down arrow keys after entering the calibration procedure to skip to the next possible calibration buffer. In this case, after confirmation of the cell constant, the meter will ask for the offset calibration displaying zero on the LCD; press CAL to exit or calibrate the offset, if desired. · Press SETUP key. · Using , and , enter the probe cell constant (the value must be between 1. 333 and 4. 000 cm-1) and confirm by pressing CFM. Note Note Note Note The EC or TDS calibration value shown is referenced at 25°C even if the reference temperature of 20°C has been selected. [. . . ] If the repair is not covered by the warranty, you will be notified of the charges incurred. If the instrument is to be returned to Hanna Instruments, first obtain a Returned Goods Authorization number from the Customer Service department and then send it with shipping costs prepaid. When shipping any instrument, make sure it is properly packaged for complete protection. CE DECLARATION OF CONFORMITY Hanna Instruments reserves the right to modify the design, construction and appearance of its products without advance notice. Recommendations for Users Before using these products, make sure that they are entirely suitable for the environment in which they are used. Operation of these instruments in residential areas could cause unacceptable interferences to radio and TV equipment. [. . . ]