Hanna Instruments HI 8711 - Manual (Page 41)

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AmpHel ® is a registered Trademark of "Hanna Instruments"
LONG DISTANCE INSTALLATIONS, ISOLATED OUTPUT FOR PC INTERFACE
If the needed installation distance is greater than 50 m (165'), it is
necessary the use of a transmitter.
HANNA instruments
® offers a full line of pH and ORP transmitters with or
without display.