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MODEL 381 pH/ORP TABLE OF CONTENTS
MODEL 381 pH/ORP SENSOR
TABLE OF CONTENTS
Section Title Page
1.0 DESCRIPTION AND SPECIFICATIONS........................................................... 1
1.1 Features and Applications................................................................................. 1
1.2 Sensor Specifications........................................................................................ 2
1.3 Ordering Information ......................................................................................... 3
2.0 INSTALLATION ................................................................................................. 5
2.1 Installation......................................................................................................... 5
2.2 Submersion Installation (Code 02).................................................................... 5
2.3 Insertion Installation (Code 00) ......................................................................... 7
2.4 Flow Through Installation (Code 03) ................................................................. 7
2.5 Flow Powered Cleaner Installation (Code 04)................................................... 7
2.6 Wiring................................................................................................................ 7
2.7 Start-Up and Calibration.................................................................................... 14
2.8 Model 381 pH and pHE..................................................................................... 14
2.9 Model 381 ORP................................................................................................. 14
3.0 MAINTENANCE................................................................................................ 15
3.1 General ............................................................................................................. 15
3.2 Periodic Maintenance........................................................................................ 15
3.3 Troubleshooting................................................................................................. 16
3.4 Preamplifier Troubleshooting ............................................................................ 18
3.5 T.C. Element Maintenance................................................................................ 18
4.0 ULTRASONIC CLEANER ................................................................................. 21
4.1 Ultrasonic Cleaner............................................................................................. 21
4.2 Specifications .................................................................................................... 21
4.3 Installation......................................................................................................... 21
4.4 Operation .......................................................................................................... 22
4.5 Maintenance...................................................................................................... 22
4.6 Replacement Parts............................................................................................ 22
5.0 RETURN OF MATERIAL................................................................................... 25
LIST OF TABLES
Table No. Title Page
2-1 ORP of Saturated Quinhydrone Solutions (in Millivolts).................................... 14
3-1 Troubleshooting................................................................................................. 17
3-2 Temperature vs. Resistance of Auto TC Element.............................................. 18
3-3 R
o
& R
1
Values for Temperature Compensation Elements .............................. 18
3-4 Model 381 Spare Parts...................................................................................... 19
3-5 Accessories....................................................................................................... 19
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