User Guide

the HI 504920 pH reading. Both pH tags blink alterna-

tively.

• To return to normal mode, press ALT and TXCAL.

• If a communication error between

the portable meter and the trans-

mitter occurs, the primary LCD shows

the “rSEr” message: check the in-

terface cable and connections.

• If the LCD shows “...”, verify that the HI 504910 transmit-

ter be configured for pH (not for ORP) measurement.

USING HI 504920 AS TERMINAL FOR HI 504910

Select code 90 in Setup mode and press CFM to confirm.

The HI 504920 enters the Terminal mode and the LOG tag

blinks on the LCD.

Note In this situation it is not necessary to connect the electrode to

the HI 504920 portable meter, which is working as key-

board and LCD for the HI 504910 transmitter.

To enter the calibration mode press

(ALT+) CAL.

Enter the correct password and press the CFM key. If a wrong

password is entered, the instrument returns to the previous

mode.

Note If the meter is set to measure ORP (setup item G.00), the pH

calibration, pH reading offset adjustment, and pH offset and

slope are not available. If the meter is configured for pH, no

ORP calibration can be selected.

Note Any calibration procedure can be aborted at any time by

pressing (ALT+) CAL, and the instrument returns to the previ-

ous mode.

pH CALIBRATION

To perform any pH calibration procedure, the instrument has

to be set as pH meter.

The meter can be calibrated through a one-point or two-

point calibration.