Teledyne 3020 Operating instructions

3020 Submerged Probe
Flow Transmitter
Installation and Operation Guide
Part #60-3403-061 of Assembly #60-3404-058
Copyright © 1990. All rights reserved, Teledyne Isco
Revision P, February 2012

Foreword
This instruction manual is designed to help you gain a thorough understanding of the
operation of the equipment. Teledyne Isco recommends that you read this manual
completely before placing the equipment in service.
Although Teledyne Isco designs reliability into all equipment, there is always the possi-
bility of a malfunction. This manual may help in diagnosing and repairing the malfunc-
tion.
If the problem persists, call or e-mail the Teledyne Isco Technical Service Department
for assistance. Simple difficulties can often be diagnosed over the phone.
If it is necessary to return the equipment to the factory for service, please follow the
shipping instructions provided by the Customer Service Department, including the
use of the Return Authorization Number specified. Be sure to include a note
describing the malfunction. This will aid in the prompt repair and return of the
equipment.
Teledyne Isco welcomes suggestions that would improve the information presented in
this manual or enhance the operation of the equipment itself.
Teledyne Isco is continually improving its products and reserves the right to
change product specifications, replacement parts, schematics, and instruc-
tions without notice.
Contact Information
Customer Service
Phone: [phone] (USA, Canada, Mexico)
[phone] (Outside North America)
Fax: [phone]
Email: [email protected]om
Technical Support
Phone: [phone] (Analytical)
[phone] (Samplers and Flow Meters)
Email: [e-mail]
Return equipment to: 4700 Superior Street, Lincoln, NE 68504-1398
Other Correspondence
Mail to: P.O. Box 82531, Lincoln, NE 68501-2531
Email: [email protected]
Web site: www.isco.com
Revised March 17, 2009

i
3020 Flow Transmitter
Table of Contents
Section 1 Introduction
1.1 Manual Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.3 Associated Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.4 The Submerged Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.5 Labels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.6 Controls, Indicators, and Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.7 Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Section 2 Operation and Programming
2.1 Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.1 3020 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.2 The Submerged Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.3 Transducer Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.1.4 Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2 Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2.1 Keypad Layout and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2.2 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.3 Power Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.3 Programming. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.3.1 Programming Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.3.2 List of Program Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.3.3 Description of Program Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.3.4 Equations Used in Flow Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.3.5 Default Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.4 Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.4.1 Programming for a Parshall Flume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.4.2 Programming for a Cipolletti Weir . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
2.4.3 Programming with the Equation (Device #34) . . . . . . . . . . . . . . . . . . . . . . 2-19
2.4.4 Programming Example Using an Equation . . . . . . . . . . . . . . . . . . . . . . . . 2-20
2.4.5 Rectangular Weirs with End Contractions . . . . . . . . . . . . . . . . . . . . . . . . 2-23
2.4.6 Programming Example for a Rectangular Weir with End Contractions . 2-25
Section 3 Installation
3.1 General Comments on Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1.1 Avoid Possibility of Submersion and Installation in Unsecured Locations 3-1
3.1.2 Location of the Flow Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.1.3 Portable Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2 General Wiring Comments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2.1 Mounting and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2.2 Stahlin Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.2.3 Connection to a Power Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.2.4 Voltage Selector Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.2.5 Wiring the Submerged Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.2.6 Distances Up to 75 Feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.3 Using the Quick-Disconnect Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

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3.3.1 Reference Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.3.2 Mounting the Quick-Disconnect Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
3.3.3 Preparing Shielded Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3.3.4 Connecting the Level Sensor Cable to the QD Box . . . . . . . . . . . . . . . . . . . 3-7
3.3.5 Connecting the Cable from the QD Box to the 3020 . . . . . . . . . . . . . . . . . . 3-7
3.4 Connection to a Sampler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.4.1 Sampler Located Within 22 Feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.4.2 Sampler Located Over 22 Feet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.4.3 Connection to a Non-Isco Sampler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3.5 Connection to Other Equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.6 Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.7 Installing the Submerged Probe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.8 General Mounting Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.8.1 Functionality Under Solids . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.8.2 Minimum Reliable Detection Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
3.9 Submerged Probe Nose Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11
3.9.1 Attaching the Nose Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3.10 Circular Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3.10.1 Spring Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3.10.2 Scissors Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
3.11 Other Mounting Techniques. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
3.11.1 Rectangular and Trapezoidal Channels . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
3.11.2 Stilling Wells or Streams with Very Low Velocity . . . . . . . . . . . . . . . . . . 3-17
3.11.3 Securing Probe with a Weighted Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
3.11.4 Weirs and Flumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
3.12 Completing the Probe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Section 4 Options and Accessories
4.1 High-Low Alarm Relay Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
4.1.1 Setting the Limit Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.2 Installation of the Alarm Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4.1.3 Wiring the Alarm Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
4.2 Connection to External Serial Devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4.3 Remote Totalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.3.1 Wiring the Remote Totalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
4.4 Extension Cables for the Sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.5 Quick-Disconnect Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.6 Model 2410 Circular Chart Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4.6.1 Wiring the 2410 Recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Section 5 Maintenance and Troubleshooting
5.1 Care of the Flow Transmitter Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.1.1 Case Seal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.1.2 Preventing Moisture Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.2 Regenerating the Desiccant Cartridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.2.1 Determining Condition of Desiccant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.2.2 Identify Desiccant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.2.3 Regeneration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
5.3 Care of the Submerged Probe and Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
5.3.1 Low Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5.3.2 Cleaning the Submerged Probe Without Disassembly . . . . . . . . . . . . . . . . 5-4
5.3.3 Disassembling the Probe for Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
5.3.4 Cable Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5.4 Mechanical and Electrical Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5.4.1 Accessing the Terminal PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
5.4.2 Accessing the Flow Transmitter PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

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5.4.3 Fuse Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
5.5 Display Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
5.5.1 Software Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
5.6 Hints on Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
5.7 If Serious Problems Occur . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.7.1 Preliminary Troubleshooting Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
5.7.2 Precautions for Servicing AC-Powered Equipment . . . . . . . . . . . . . . . . . . 5-10
5.7.3 Precautions for Servicing CMOS Circuitry . . . . . . . . . . . . . . . . . . . . . . . . 5-11
5.7.4 Call for Assistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12
5.8 Circuit Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
5.8.1 Terminal Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
5.8.2 CPU Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13
Appendix A Replacement Parts and Accessories
A.1 Replacement Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
A.2 Accessories and Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-5
Appendix B Programming Worksheets
Appendix C General Safety Procedures
C.1 Practical Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1
C.2 Lethal Atmospheres in Sewers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4
C.3 Hazardous Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6
Appendix D Material Safety Data Sheets
D.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
List of Figures
1-1 3020 Flow Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1-2 Submerged Probe Level Sensor (shown with standard tip) . . . . . . . . . . . . . . . . . . 1-3
1-3 3020 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1-4 3020 Interior, Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
2-1 Simplified Flowchart Programming Flowchart for the 3020 . . . . . . . . . . . . . . . . . 2-5
3-1 View of Case Latch, Showing Lock Shackle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
3-2 Stahlin Fittings (Compression Bushings) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3-3 Quick-Disconnect Box (cover removed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3-4 Submerged Probe Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3-5 Alignment of Grounding Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3-6 Sensor Installed on a Spring Ring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
3-7 Spring Ring Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3-8 Mounting Ring in a Round Pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
3-9 Universal Mounting Ring Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
3-10 Isco Rectangular Mounting Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
3-11 Typical Primary Device Installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
4-1 High-Low Alarm Relay Box (cover removed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-2 Interconnection of 3020 and Alarm Boxe(s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-3 Remote Totalizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
5-1 Warning Disk Inside Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5-2 Alignment of Grounding Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5
5-3 Aluminum Cover and Interconnect Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
5-4 Circuit Board with Aluminum Cover Removed . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
5-5 Component Layout of the CPU PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-14

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5-6 Component Layout of the Terminal Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15
List of Tables
1-1 3020 Controls, Indicators, and Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1-2 3020 Flow Transmitter Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
1-3 3222 Submerged Probe Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
2-1 Equations Used in the 3020 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
2-2 Values of N1 for Flow Rate in CFS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24
2-3 Values of N2 for Flow Rate in CFS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25
3-1 Locating the Head-Measuring Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
4-1 3000 Series Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
C-1 Hazardous Gases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6

1-1
3020 Flow Transmitter
Section 1 Introduction
The first section of the 3020 instruction manual provides a
general introduction to the flow meter. It includes a brief dis-
cussion of the organization of the manual, an overall description
of the flow transmitter, and technical specifications.
1.1 Manual Organization The purpose of this manual is to provide the user with the infor-
mation necessary to operate, maintain, and service the 3020 Sub-
merged Probe Flow Transmitter. To accomplish this, the manual
is organized into five sections. The first section is a general intro-
duction to the flow transmitter. The second section contains
information on operation, programming the flow transmitter,
and operating examples. The third section provides installation
details. The fourth section describes available options and their
uses. The fifth section contains information on routine mainte-
nance and servicing to assist the user in correcting problems that
may occur.
1.2 Description The 3020, shown in Figure 1-1, uses a submerged probe for level
measurement. The flow transmitter will normally be used with
some type of primary measuring device to measure flow in an
open channel. The 3020 uses level-to-flow rate conversions
derived from stored equations, which cover the vast majority of
open channel flow measurement situations. Also, the user may
enter the coefficients and powers of the flow equation. However,
most standard weirs and flumes are accommodated without the
need for this equation.
Figure 1-1 3020 Flow Transmitter

3020 Flow Transmitter
Section 1 Introduction
1-2
Programming the 3020 is done in two ways:
• Select the number of a choice listed on the flow trans-
mitter front panel label and enter that number on the
keypad
• Enter a numeric value for steps requiring a value be
selected from a given range.
A six-digit LCD (Liquid Crystal Display) prompts the user
through setup, displays the choice for the current programming
step, and displays level and flow rate.
1.3 Associated Equipment The 3020 Flow Transmitter may be used with the following
equipment:
Interfacing
• 3700 and 6700 Series Portable and Refrigerated
Samplers
• GLS Compact Portable Sampler
• Glacier Refrigerated Compact Sampler
• 2410 Circular Chart Recorder
Optional Accessories
•Resettable 7-digit mechanical flow totalizer. (A
non-resettable flow totalizer is a standard feature of the
3020.)
• High-Low Alarm Relay Box
• Extension Cables for the submerged probe in lengths of
25 and 50 feet. (7,6-15,2 m)
• Quick-Disconnect Box
Allows probe installation up to 1000 feet (304,8 m) from
flow transmitter.
• Expansion rings and extension plates for mounting
probe
• Remote Totalizer
• Flow Transmitter-to-Sampler Connect Cable
1.4 The Submerged Probe The submerged probe, used by the 3020 Flow Transmitter as a
level sensor, is shown in Figure 1-2, and is mounted in the flow
stream. It measures liquid level by sensing changes in hydro-
static pressure as level increases or decreases above it. The sub-
merged probe consists of a differential IC (integrated circuit)
pressure transducer mounted inside the probe assembly and a
shielded cable, which connects the submerged probe to an encap-
sulated electronics package containing an amplifier. The probe
body contains several ports which carry the hydrostatic pressure
of the flow stream directly to the transducer surface.
The cable contains not only the power and signal wires, but also
a hollow vent tube which serves to reference the differential port
of the pressure transducer to atmospheric pressure. A ground
wire in the cable keeps the flow transmitter ground and the