Hanna Instruments HI 1285-5 User manual

HI 9813-5
pH/EC/TDS/°C meter
Quick Reference Guide
TAKING MEASUREMENTS
• Connect the HI 1285-5 probe and switch the meter ON.
• Submerge the probe into the sample to be tested.
• Select the desired measurement range (pH, mS/cm, ppm, °C)
by pressing the correspondent key.
Note: If the display shows only a “1”, the
meter is out of range.
• Wait for a couple of minutes for reaching
the thermal equilibrium before taking any
measurements.
• After use switch off the instrument, clean and cover the probe
with the protective cap.
Note: It is recommended to clean often the probe with HI 700661
Cleaning Solution.
BATTERY REPLACEMENT
When the battery level is so low that it may cause unreliable
measurements, the meter turns off.
It is recommended to replace the battery immediately.
Unscrew the three screws on the rear of the meter, remove the
battery compartment cover and replace the 9V alkaline battery
with a new one while observing its polarity.
Make sure the battery contacts are tight and secure before
replacing the cover.
www.hannainst.com

CALIBRATION PROCEDURE
• Connect the probe and switch the meter ON.
• Immerse the probe in the calibration solution.
•For pH calibration: use HI 7007 (pH 7.01) buffer if you
are going to measure neutral or close to neutral samples,
HI 7004 (pH 4.01) if you are going to measure acidic
samples or HI 7010 (pH 10.01) for alkaline measurements.
Note: If you need to calibrate to NBS standards, use HI 7006
(pH 6.86) instead of HI 7007 and HI 7009 (pH 9.18)
instead of HI 7010.
•For EC or TDS calibration: use HI 70031 (1.41 mS/cm) EC
calibration solution or HI 70442 (1500 ppm) TDS calibration
solution.
Note: The conversion between EC and TDS is made by a built-in
circuit, hence it is requested to calibrate the meter only in
EC or TDS range. The other range is thus automatically
calibrated.
• Press °C and record the temperature of the calibration
solution.
• Adjust the pH or the EC/TDS knob to display the solution
value at the measured temperature (refer to the tables “pH
vs. temperature” or “Conductivity vs. temperature” on the
solution packet).
QR9813-5N 01/10