User Guide

1. Liquid Crystal Display

2. ON/OFF key, to turn the HI 504920 on and off.

3. ALT key, to activate alternate key functions

4. DISPLAY / CAL DATA key, to enter/exit the event scrolling mode, to view pH

buffer or °C while calibrating pH, and to view last calibra-

tion data (with ALT)

5. TXCAL key, for quick single point pH calibration

6.  SETUP key, to move up or enter/exit the Setup mode (with ALT)

7.  CAL key, to move right or enter/exit the calibration mode (with ALT)

8.  CALT key, to move down (no alternate function for HI 504910)

9. CFM key, to confirm values.

The device can be restarted at any time by pressing CFM,

ALT and  SETUP together (CFM first)

Keyboard and LCD for HI 504910 are normally provided

by HI 504920. To do this, HI 504920 has to be put

into terminal mode, by selecting code 90 in Setup

mode.

If the HI 504920 meter is not handy, the keyboard and

LCD inside the transmitter case can be used for configur-

ing, calibrating and monitoring HI 504910.