Extech Instruments PH220A User Manual Download Page 9

Model PH220 Version 3.1 11/2005 

 

Support line (781) 890-7440 

Technical support: Extension 200; E-mail: [email protected] 

Repair & Returns: Extension 210; E-mail: [email protected] 

Product specifications subject to change without notice 

For the latest version of this User’s Guide, Software updates, and other 

up-to-the-minute product information, visit our website: www.extech.com

 

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451 

Calibration and Repair Services 

Extech offers repair and calibration services

 for the products we sell. Extech also 

provides NIST certification for most products. Call the Customer Service Department for 
information on calibration services available for this product. Extech recommends that 
annual calibrations be performed to verify meter performance and accuracy. 

Warranty 

EXTECH INSTRUMENTS CORPORATION

 warrants this instrument to be free of defects in parts and 

workmanship for 

one year

 from date of shipment (a six month limited warranty applies to sensors and cables). 

If it should become necessary to return the instrument for service during or beyond the warranty period, 
contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website 
www.extech.com for contact information. A Return Authorization (RA) number must be issued before any 
product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper 
packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the 
user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or 
unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for 
a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's 
total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no 
other warranty, whether written or oral, is expressed or implied. 

 
 

 

 

 
 
 
 
 
 
 
 
 

Copyright 

©

 2005 Extech Instruments Corporation 

All rights reserved including the right of reproduction in whole or in part in any form. 

 

 

Summary of Contents for PH220A

Page 1: ...evice with tactile push buttons is battery operated and ideal for field use The PH220 simultaneously displays pH and temperature The rubber holster which protects the meter has a magnetic backing for...

Page 2: ...simultaneous pH and temperature readings Over range or open indication Displays HHH for over range or open input conditions Displays LLL for under range pH Calibration points 4 00 7 00 10 00 1 2 or 3...

Page 3: ...play icons are used and are discussed in the appropriate sections of this manual Order of Operations 1 Calibrate the instrument as described later in this manual 2 Determine the test type pH or ORP an...

Page 4: ...nction does not require calibration pH Calibration Procedure 1 Place the electrode into a 7 00 pH buffer solution Press and hold the CAL button until CAL appears in the display 2 The instrument automa...

Page 5: ...g the on off button Wait for the self test SLF tSt to finish 4 Use the MODE button to select mV mode The display will reflect the unit of measure 5 Place the electrode into a sample solution When the...

Page 6: ...time the recall mode is accessed 3 While in the RECALL mode use the STORE RECALL button to scroll through the stored readings The most recent readings will show first LAST IN FIRST OUT 4 Press and ho...

Page 7: ...it over the top of the meter ensure that the electrode is disconnected 3 Pry the battery compartment up from the top of the meter using a screwdriver or coin at one of the two indentations see diagra...

Page 8: ...ine measurement Soak in 0 1 M HCL overnight Deteriorated Gel layer Replace electrode Protein coating on electrode surface Soak in 1 gm Pepsin dissolved in 100ml of 0 1 m HCL for 30 minutes or as neede...

Page 9: ...o sensors and cables If it should become necessary to return the instrument for service during or beyond the warranty period contact the Customer Service Department at 781 890 7440 ext 210 for authori...

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