Instruction Manual HI 9146 Dissolved Oxygen and Temperature Meter w w w. h a n n a i n s t .
Dear Customer, Thank you for choosing a Hanna Instruments product. Please read this instruction manual carefully before using this instrument. This manual will provide you with the necessary information for correct use of this instrument, as well as a precise idea of their versatility. If you need additional technical information, do not hesitate to e-mail us at tech@hannainst.com.
PRELIMINARY EXAMINATION Remove the instrument from the packing material and examine it carefully to make sure that no damage has occurred during shipping. If there is any damage, notify your Dealer or the nearest Hanna Customer Service Center. Each instrument is supplied with: • HI 76407/2 DO probe with 2 m (6.7’) cable • HI 76407A membarne cap (2 pcs.) • HI 7041S electrolyte solution (30 mL) • 3 x 1.
PROBE FUNCTIONAL DESCRIPTION 3 1 4 4 7 5 8 2 6 10 9 1. D.O. Probe 2. Protective Cap 3. Watertight Shielded Cable 4. Polypropylene Probe Body 5. Temperature Sensor 6. O-Ring Seal 7. Silver Chloride Anode 8. Platinum Cathode (sensor) 9. Oxygen Permeable PTFE Membrane 10.
METER FUNCTIONAL DESCRIPTION 1) 2) 3) 4) 5) 6) 7) 8) 9) Liquid Crystal Display (LCD). Range key, to select ppm or % range. On/Off key, to turn the instrument ON and OFF. CAL key, to enter/exit calibration mode. Setup key, to enter/exit SETUP mode. key, to manually increase temperature or other parameters. Battery compartment cap. DIN connector for DO probe. key, to manually decrease temperature or other parameters.
10) GLP key, to display Good Laboratory Practice information. CFM key, to confirm different values. 11) AutoEnd key, to freeze first stable reading on the LCD. 12) Light key, to toggle display backlighting. 13) Secondary LCD. 14) Primary LCD.
SPECIFICATIONS 0.00 to 45.00 ppm RANGE 0.0 to 300.0% 0.0 to 50.0 ºC 0.01 ppm RE SOLUTION ACCURACY @ 20 °C/68 °F D .O. Calibration 0.1% 0.1 °C ±1.5% of full scale or ±1 digit whichever greater ±0.2 ºC excluding probe error Single or double point at 0% (HI 7040) and 100% (in air) Altitude Compensation Resolution Salinity Compensation Resolution Temperature Compensation Probe Battery Type & Life D imensions Weight E nvironment Warranty 0 to 4,000 m (13,120') 100 m (328') 0 to 80 g/l 1 g/l 0.0 to 50.
OPERATIONAL GUIDE INITIAL PREPARATION The instrument is supplied complete with batteries. In order to place the batteries inside the instrument follow the instructions from page 21. To take measurements, connect the DO probe to the meter securely by aligning the pins with the socket located on the back of the meter, pushing the plug in and tightening the threaded ring. Probes shipped from Hanna Instruments are dry.
Turn the instrument ON by pressing On/Off. At start-up the display will show all the used segments for a few seconds (or while the button is held), followed by the percentage indication of the remaining battery life. • After a few seconds “Cond” message appears, the “ ” and “WAIT” tags will blink on the LCD if probe is connected to inform the user that the probe is in auto-conditioning (automatic polarization) mode.
With the probe properly polarized, oxygen is continually consumed when it passes through the sensitive diaphragm and dissolves in the electrolyte solution contained in the probe. If polarization is interrupted, the electrolyte solution continues to be enriched with oxygen until it reaches an equilibrium with the surrounding solution. Whenever measurements are taken with a non-polarized probe, the oxygen level revealed is both that of the tested solution, as well as that present in the electrolyte solution.
For accurate Dissolved Oxygen measurements, a water movement of 0.3 m/s is required. This is to ensure that the oxygen-depleted membrane surface is constantly replenished. A moving stream will provide adequate circulation. The use of a magnetic stirrer to ensure a certain fluid velocity is recommended. TEMPERATURE MEASUREMENTS The probe has a built-in temperature sensor. The measured temperature is indicated on the secondary LCD as shown above.
AutoEnd To freeze the first stable reading on the LCD press AutoEnd while the instrument is in measurement mode. The ”HOLD” tag will be displayed blinking on the LCD until the reading will stabilize. When the reading is stable, the “HOLD” tag stops blinking and the reading is frozen on the LCD. Press AutoEnd again to return to normal measurement mode. Note: • Pressing Range the instrument will skip to the displayed range, without leaving AutoEnd mode.
INITIAL PREPARATION • Pour small quantities of HI 7040 Zero Oxygen solution into a beaker. If possible, use a plastic beaker to minimize any EMC interferences. • Make sure the probe is ready for measurements (see probe preparation on page 8), i.e. the membrane is filled with electrolyte and the probe is connected to the meter. • Switch the meter on by pressing the On/Off switch. • For an accurate calibration, it is recommended to wait for at least 15 minutes to ensure precise conditioning of the probe.
SLOPE CALIBRATION It is suggested to perform the slope calibration in air. • Rinse the probe in clean water to remove any residual zero oxygen solution. Note: If you did not perform the zero calibration procedure, press CAL and then the ARROW keys to select the 100% DO calibration point. • Dry the probe tip and allow a few seconds for the LCD reading to stabilize. The “ ” and “NOT READY” tags will blink until the reading is stable. • When the reading is stable, “CFM” tag starts blinking.
GOOD LABORATORY PRACTICE (GLP) GLP is a set of functions that allows storage and retrieval of data regarding the maintenance and status of the probe. All data regarding DO calibration is stored for the user to review when necessary. LAST DO CALIBRATION DATA The last DO calibration data is stored automatically after a successful calibration. To view the DO calibration data, press GLP when the instrument is in DO measurement mode. The instrument will display the date (mm.
• The altitude value. • The salinity value. Press GLP at any moment and the instrument will return to measurement mode.
SETUP Setup mode allows viewing and modifying the following parameters: • Salinity value (SAL) • Altitude value (ALt) • Current Time (hour & minute) • Current Date (month, day & year) • Beep Status (bEEP) • Instrument ID (InSID) • Auto-off backlight (LIGH) • Auto power of (AOFF) • Temperature Unit To enter SETUP mode, press Setup while the instrument is in measurement mode. Select the desired setup parameter using the ARROW keys. Press CAL if you want to change the item value.
DISSOLVED OXYGEN CONCENTRATION VERSUS SALINITY CHART Salinity affects the Dissolved Oxygen concentration expressed in ppm, decreasing its value. The table below shows the maximum oxygen solubility at various temperatures and salinity levels. Salinity (g/l) at Sea Level ºC 0 ºF 0 g/l 10 g/l 20 g/l 30 g/l 35 g/l 14.60 13.64 12.74 11.90 11.50 32.0 2 13.81 12.91 12.07 11.29 10.91 35.6 4 13.09 12.25 11.47 10.73 10.38 39.2 6 12.44 11.65 10.91 10.22 9.89 42.8 8 11.83 11.09 10.
DISSOLVED OXYGEN CONCENTRATION VERSUS ALTITUDE CHART Altitude affects Dissolved Oxygen concentration expressed in ppm, decreasing its value. The table shows the maximum oxygen solubility at various temperatures and altitudes. Altitude, Meters above Sea Level ºC 300 600 900 1200 1500 1800 2100 2400 2700 3000 3300 3600 3900 4000 0m m m m m m m m m m m m m m m ºF 0 14.6 14.1 13.6 13.1 12.6 12.1 11.7 11.2 10.8 10.4 10.0 9.7 9.3 9.0 8.9 32.0 2 13.8 13.3 12.8 12.4 11.9 11.5 11.0 10.6 10.2 9.9 9.5 9.
TEMPERATURE CALIBRATION (for technical personnel only) All the instruments are factory calibrated for temperature. Hanna’s temperature probes are interchangeable and no temperature calibration is needed when they are replaced. If the temperature measurements are inaccurate, temperature recalibration should be performed. For an accurate recalibration, contact your dealer or the nearest Hanna Customer Service Center, or follow the instructions below.
BATTERIES REPLACEMENT If the batteries become weak, the display will flash the battery symbol to advise the user that approx. 1 hour of working time is left. It is recommended to change the batteries as soon as the battery indicator blinks (lower frequency). To replace the batteries, follow the next steps: • Turn OFF the instrument. • Open the battery compartment cap (located on the top of the instrument). • Remove old batteries. • Insert three new 1.
LCD MESSAGE GUIDE TAGS & SYMBOLS • Mode tags light up for indicating the corresponding active mode, and blink for warning the user. MEASURE on: Instrument in measurement mode. SETUP on: SETUP menu mode has been entered. CALIBRATION on: calibration mode has been entered. GLP on: GLP mode has been entered. • Reading in HOLD: HOLD on: reading frozen in AutoEnd mode. HOLD blinking: reading unstable in AutoEnd mode. • “°C” or “°F” blinking: temperature is out of range.
PROBE & MEMBRANE MAINTENANCE The oxygen probe body is made of reinforced plastic for maximum durability. A thermistor temperature sensor provides temperature measurements of the sample. Use the protective probe cap when not in use. To replace the membrane or refill with electrolyte, proceed as follows: • Remove the protective cap by gently twisting and pulling it off the body of the probe (see fig. 1). • Unscrew the membrane cap by turning it counterclockwise (see fig.2).
IMPORTANT In order to have accurate and stable measurements, it is important that the membrane surface is in perfect condition. This semipermeable membrane isolates the sensor elements from the environment but allows oxygen to enter. If any dirt is observed on the membrane, rinse carefully with distilled or deionized water. If any imperfections still exist, or any damage is evident (such as wrinkles or tears-holes), the membrane should be replaced.
TROUBLESHOOTING GUIDE SYMP TOMS P ROBL E M SOL UTION Readings fluctuate up and down (noise). D O probe not properly connected. Insert the probe. D isplay shows D O reading blinking. Reading out of range. Recalibrate the meter. Check the sample is within measurable range. The meter fails to Broken probe. calibrate or gives faulty readings. Replace the probe. At startup the meter displays all LCD tags permanently. One of the keys is blocked. Check the keyboard or contact the vendor.
ACCESSORIES HI 98501 Electronic thermometer (range: -50.0 to 150.0 °C) HI 98502 Electronic thermometer (range: -58.0 to 302 °F) HI 7040M Zero Oxygen Solution, 230 ml HI 7040L Zero Oxygen Solution, 460 ml HI 7041S Refilling Electrolyte Solution, 30 ml HI 76407/2 Spare probe with 2 meters (6.7') cable HI 76407/10 Spare probe with 10 meters (33') cable HI 76407/20 Spare probe with 20 meters (67') cable HI 76407A/P 5 spare membranes OTHER ACCESSORIES HI 740028 1.
RECOMMENDATIONS FOR USERS Before using these products, make sure 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, requiring the operator to follow all necessary steps to correct interferences. During operation, ESD wrist straps should be worn to avoid possible damage to the electrode by electrostatic discharges.
Hanna Instruments Inc. Highland Industrial Park 584 Park East Drive Woonsocket, RI 02895 USA Technical Support for Customers Tel. (800) 426 6287 Fax (401) 765 7575 E-mail tech@hannainst.com www.hannainst.