[HANNA instruments]

GENERAL DESCRIPTION
The HI 3512 instrument is state-of-the-art, professional bench meter with graphical LCD, designed to provide laboratory results and accuracy. Two input channels are available.
• Channel 1: pH/mV/ISE and temperature
• Channel 2: EC/TDS, NaCl/Resistivity and temperature

HI 3512 is provided with a series of new diagnostic features which add an entirely new dimension to the measurement of pH and EC, by allowing the user to dramatically improve the reliability of the measurement: pH channel:
• 7 standard pH buffers (pH 1.68, 4.01, 6.86, 7.01, 9.18, 10.01
   and 12.45) for calibration.
• pH calibration up to five calibration points (see instrument specifications).
• Custom calibration with up to two custom buffers.
• Messages on the graphic LCD for an easy and accurate calibration.
• Diagnostic features to alert the user when the electrode needs cleaning.
• User selectable “Out of cal. range“ warning.
• User selectable “Calibration Timeout“ to remind when a new
   calibration is necessary.
• Extended temperature range on pH channel from –20 to 120 ºC
   (–4 to 248 ºF), using HI 7662-T interchangeable temperature
   probes.

EC channel:
• 7 memorized standards (0.00 µS/cm, 84.0 µS/cm, 1.413 mS/cm,
   5.00 mS/cm, 12.88 mS/cm, 80.0 mS/cm and 111.8 mS/cm) for
   calibration.
• EC calibration up to two calibration points.
• Messages on the graphic LCD for an easy and accurate calibration.
• Diagnostic features to alert the user when the electrode needs cleaning.
• User selectable “Out of cal. range” warning.
• User selectable “Calibration Timeout” to remind when a new
   calibration is necessary.
• Extended temperature range on EC channel from –20 to 120 ºC
   (–4 to 248 ºF), using temperature sensor inside EC probe.
• Temperature compensation selection
• Temperature reference selection 15 °C, 20 °C or 25 °C.
• Temperature coefficient set
• Lock and user setup Fixed range selectionOther features include:
• Log on demand up to 400 samples
• Log interval with log on stability feature up to 600 records
• Auto Hold feature, to freeze first stable reading on the LCD
• GLP feature, to view last calibration data for pH, Rel mV, ISE, EC or
   NaCl.
• PC interface