User Guide

HI 504910 pH READING CHECK

The check of the HI 504910 pH reading against the HI 504920 pH

reading is possible at any time.

Perform the following steps:

• Connect the infrared optical interface cable to HI 504910.

• Press (ALT+) TXCAL.

• The primary LCD shows the HI 504910

pH reading and the secondary one dis-

plays the HI 504920 pH reading. Both

pH tags blink alternatively.

• Press (ALT+) TXCAL to return to normal mode.

Note: In case of a communication error

between HI 504920 and HI 504910,

the LCD shows the "rSEr" message.

Check interface cable and connections.

Note: If the LCD shows "...", verify that HI 504910 is configured to

measure pH and not ORP.