2Dear Customer,Thank you for choosing a Hanna Instruments product.Please read this instruction manual carefully before using the instruments.This manual will provide you with the necessary information for correctuse of the instruments, as well as a precise idea of their versatility.HI 98140, HI 98150 and HI 98160 are guaranteed for two yearsagainst defects in workmanship and materials when used for theirintended purpose and maintained according to instructions. Electrodesand probes are guaranteed for six months. This warranty is limited torepair or replacement free of charge.Damage due to accidents, misuse, tampering or lack of prescribedmaintenance is not covered.If service is required, contact the dealer from whom you purchased theinstrument. If under warranty, report the model number, date of purchase,serial number and the nature of the problem. If the repair is not coveredby the warranty, you will be notified of the charges incurred. If theinstrument is to be returned to Hanna Instruments, first obtain aReturned Goods Authorization number from the Technical Service departmentand then send it with shipping costs prepaid. When shipping anyinstrument, make sure it is properly packed for complete protection.WARRANTY ........................................................................................................... 2PRELIMINARY EXAMINATION ................................................................................. 3GENERAL DESCRIPTION ......................................................................................... 3FUNCTIONAL DESCRIPTION .................................................................................... 5SPECIFICATIONS ................................................................................................... 7OPERATIONAL GUIDE ............................................................................................. 8pH CALIBRATION ................................................................................................. 11pH BUFFER TEMPERATURE DEPENDENCE ............................................................ 16RELATIVE mV CALIBRATION (HI 98150 & HI 98160) .............................................. 17GOOD LABORATORY PRACTICE (GLP) ..................................................................... 18SETUP ................................................................................................................ 21LOGGING ............................................................................................................. 23AutoEnd ............................................................................................................. 25TEMPERATURE CALIBRATION (for technical personnel only) .................................. 26mV CALIBRATION (HI 98160 only) (for technical personnel only) .......................... 27PC INTERFACE ..................................................................................................... 28BATTERIES REPLACEMENT .................................................................................... 33LCD MESSAGE GUIDE ........................................................................................... 34TEMPERATURE CORRELATION FOR pH SENSITIVE GLASS ....................................... 36ELECTRODE CONDITIONING & MAINTENANCE ....................................................... 37TROUBLESHOOTING GUIDE .................................................................................. 40ACCESSORIES ..................................................................................................... 41WARRANTYWARRANTYWARRANTYWARRANTYWARRANTYTABLE OF CONTENTSTABLE OF CONTENTSTABLE OF CONTENTSTABLE OF CONTENTSTABLE OF CONTENTS