User Guide

• Calibration and Setup procedures are password protected.

• Calibration: pH calibration at 2 points with two possible sets

of buffers (either 7.01 - 4.01 - 10.01 or 6.86 - 4.01 - 9.18),

or at 1 point with user-selectable value.

• Temperature compensation of the HANNA standard buffers.

• GLP features: old probe check, dead probe check, calibra-

tion time-out, last calibration data internally recorded (non-

volatile EEPROM memory): calibration date and time, pH

offset, pH slope, number of calibration points and corre-

spondent pH values.

• Solution compensation of the pH reading.

• Manual temperature setting when the temperature probe is

not inserted or temperature is out of range.

• Input: pH/ORP electrode with BNC connector.

• Input: pH/ORP/Temperature Digital Transmitter (HI

504910) which can be connected up to 1.2 Km (0.5 miles)

far away.

• Output (0-20 or 4-20 mA): one analog output for record-

ing of pH/ORP or controlling (only for models with PID).

• RS485 communication with Short Messaging Service (SMS)

for GSM phones.

• Data logging: 6000 samples pH/°C or ORP downloadable

through RS485 and HI92500 application software.

• Real time clock.

OPTIONAL FEATURES (depending on model)

• LEDs: four yellow LEDs are provided for signaling the ener-

gizing of relay 1, relay 2 (optional), relay 3 (optional) and

relay 4 (optional).

• Relays: 1, 2 or 4 output relays. The relays LEDs are switched

ON whenever the correspondent relay is energized (NO

and COM connected).

• Advanced Cleaning is provided through two cleaning commands

and variety of trigger events (relays 3 and 4 only).

• Output (0-20 or 4-20 mA): second independent analog

output for recording of temperature or controlling (only for

models with PID).

• PID control.