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Summary of Contents for Stevens 71
- Page 1 DISCONTINUED TYPE A RECORDER Model 71, 2004 Publication 93566A August 2004...
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Page 3: Table Of Contents
Contents 1. Introduction..........TABLES 1.1 General Description......... 1.2 Safety Information........1. Time Scales, QMT........1.3 Basic Instrument Specifications....2. Gage Scale, Metric........3. Gage Scale, English........2. Installation..........4 - 7 Line Shift Error .......………… 2.1 Unpacking..........8 & 9. Float Lag Error....…....2.2 Equipment &... - Page 4 NOTICE Stevens makes NO claims as to the immunity of its equipment against lightning strikes, either direct or nearby. The following statement is required by the Federal Communications Commission.
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Page 5: Introduction
1 Introduction 1.2 Safety Information 1.1 General Description Before performing any procedure in this The Stevens Type A is a float-operated manual, read all applicable warnings and recorder that provides a permanent, cautions. continuous, long-term graphic record of water level fluctuations. A precision clock movement controls the rate at which the strip chart is advanced. -
Page 6: Basic Instrument Specifications
1 Introduction 1.3 Basic Instrument Accessories (optional) Specifications . Guide Pulley for float line or tape Chart Drive (options) . Quartz Multispeed Timer (QMT) Table I Time Scales, Quartz Multispeed Timer (switch selectable) Time Scale Scale Major Minor Chart Life cm/day Division Division... -
Page 7: Gage Scale, Metric
1 Introduction Table II. Gage Scale, Metric METRIC WATER LEVEL PEN CHG. VALUE OF FLOAT GAGE CHANGE, ONE MINOR PULLEY SCALE TRAVERSE OF METER DIVISION SIZE CHART OF WATER .25 m 100 cm .2 cm 375 mm .50 m 50 cm .4 cm 750 mm 1.25 m... -
Page 8: Installation
2 Installation Install the float pulley on the recorder input 2.1 Unpacking shaft. Install the cupped washer with the recessed side toward the pulley. Thread Remove all shipping tie-downs, packing the clamping disk onto the pulley shaft. pieces, etc. Several parts and accessories Thread the hex nut onto the shaft, and are individually wrapped. -
Page 9: Installing The Chart
3 Operation Check the final position of the recorder to Pass the chart behind the drive cylinder be sure the float and counterweight can (bottom drum) and out between the move up and down freely, without cylinder and the friction rollers. Pull the interference from the side of the well or any chart upward about 1 1/2 inches beyond protuberances. -
Page 10: Positioning The Pen
3 Operation days of chart remaining is equal to the Sequence for chart installation number of divisions counted. The pen is a replaceable cartridge pen, which should be replaced periodically, as the chart line begins to dim. Simply slide the pen out of its holder and replace it with a new unit. -
Page 11: Operation
3 Operation 3.1 Quartz Multispeed Timer NOTE: THE TIMER SHOULD NEVER BE CONNECTED TO AN EXTERNAL Drive (QMT) POWER SOURCE WHILE SIMULTANEOUSLY USING INTERNAL The Quartz Multispeed Timer unit (QMT) is BATTERIES. designed to operate from 6 alkaline "D" cell batteries, which were included with the Remove the QMT cover by sliding the recorder when shipped. -
Page 12: The Pen
3 Operation NEW STEVENS QMT Stevens has redesigned the Quartz Multispeed Timer to allow for a more efficient switch configuration for setting of chart speeds. Below is a layout of the new switch, located on the timer circuit board. The switch is accessed by removing the cover of the QMT. -
Page 13: Gage Scales
3 Operation between the adjustable arm's pivot screws. 3.3 Gage Scales Be careful not to tighten the pivot screws too tight so as to bind the stylus arm. Gage scales may be reconfigured by changing either the float pulley size The disposable cartridge pen clips into the or the float pulley standard, or both pen holder on the stylus arm. -
Page 14: Maintenance
4.1.1 Quartz Clocks. The Type A Recorder is designed for long term operation with minimal maintenance. Oil or other lubricants Stevens Quartz Multispeed Timers should NOT be used on any of the are designed for reliable operation recorders mechanical parts. Sealed with very little maintenance required. -
Page 15: Technical Notes
Standard float systems are subject Standard beaded float line supplied to small errors due to float lag and by Stevens is 1 mm (0.040 in.) in line shift. These errors can be diameter, and is beaded to match minimized by selecting proper floats the recessed grooves in the float and counterweights.
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