� Efficient propeller-driven Photo-Fiber-Optic sensor coupled with precision quartz crystalcontrolled electronics provide accurate repeatable data in all flow conditions.

� The Model 2100 Indicator reads data in feet and meters per second. A toggle switch in thebattery compartment changes from one to the other.

� Powered by a single 9 volt transistor battery and there is a spare in the battery compartment too.� Three user selectable velocity averaging times in each mode. From 5 to 90 seconds in feet

per second and from 1.5 to 30 seconds in meters mode.� Sensor components (propeller, rotor, and rotor shaft) easily and inexpensively replaceable.

Carry spares into remote locations and you’ll never have to return early because of a bentbucketwheel, lost sensor magnet or bent shaft.

� Wide choice of sensor carriers or “wands” to accommodate virtually any open streamvelocity measuring requirement.

� Lightweight, portable system is easy to work with all day in the field. Indicator weighs alittle over a pound and a half.

� A simple and accurate method of user-accomplished calibration is provided with the Model2100. No other current meter provides the user a method of checking and changingcalibrations while in the field. Calibration settings for the feet and meters selection areeasily checked and changed any time.

MODEL 2100Open Stream Current Velocity Meter

SWOFFER INSTRUMENTS, INC.

The Model 2100 is a hand held current velocity meter designed specifically for the measurement of open channelvelocities.

The best in the water Since 1959

The basic principle of the Swoffer sensor is simple and unique: Multiple bundles of fiber-optics, assembled into a propeller driven rotor, gatea beam of infrared light from a photo diode to a photo-sensitive transistor producing electronic pulses. These pulses, generated by thepropeller rotor over a precisely measured amount of time, are directly proportional to water velocity.

The Model 2100 propeller rotor requires very little energy to activate, works in nearly all water conditions and produces consistent, strongoutput pulses even at low velocities. The calibration curve for the rotors is linear and consistent in all naturally occurring open channelvelocities. Propellers used with the Model 2100 are specifically designed for water so they do not require a shroud to protect them from theeffects of turbulence. Because no shroud is used the propellers are easily able to shed the debris normally found in sewers and naturalstreams.

The electronic half of the sensor contains state of the art opto-electronics and is epoxy encapsulated in a ½” (12.7mm) diameter acetal resinhousing for protection from chemicals and the elements. The sensor uses a two-wire signal system requiring as little as 3 volts DC foroperation and generates an output signal through as much as 1000 feet of cable. Because the sensor consumes such a small amount ofpower, the field life of the Model 2100 battery (a standard 9 volt size) is long. The sensor emits four pulses per revolution so the resolutionof the instrument is much higher than other sensors on the market. It is extremely accurate especially at very low velocities. It is also themost rugged and is extremely sturdy and reliable.

The standard version of the propeller rotor assembly (2100-A21) uses a very low friction fiberoptic rotor, a polished and hardened stainlesssteel shaft, and a 2” glass-filled nylon propeller. All rotor parts are easily replaceable in the field and a spare rotor assembly is provided withevery new instrument.

THE SWOFFER OPTICAL-ELECTRONIC SENSOR

06-29-09

3.170"

1.975"

0.500

2100-A22

2100-A21

2100-A232100-A25

2100-A26

2100-A27

2100-Prop

06-29-09

MODEL 2100 CURRENT METER SPECIFICATIONS *

VELOCITY RANGE 0.1 to 25 Feet Per Second

(0.03 to 7.5 Meters Per Second )

DISPLAY 4 digit, Liquid Crystal Digital, 0.7” digits

RESOLUTION To hundredths, both feet and meters.

ACCURACY Can be held to within 1% with periodic user-

required calibration tests and adjustments.

DISPLAY AVERAGING Three selectable averaging times:

5, 20 and 90 seconds-FPS mode.

1.5, 6 and 30 seconds-MPS mode.

OPERATING TEMPERATURE LCD Min.-14° F (-25.6°C)

Max. 180°F (82°C) @ 15%

humidity

Max. 120°F (49°C) @ 95%

humidity

Sensor Min. 0° F (-17.8°C)

Max. 194° F (90°C)

POWER REQUIRED One 9 volt battery. Alkaline or rechargeable nicad.

INDICATOR SIZE 4” by 6” by 2” (15.2 by 10.2 by 5.1 cm)

INDICATOR WEIGHT 25 oz. (including 9 volt batteries, one spare ).

INDICATOR MATERIAL Vacuum-formed ABS with a clear acrylic viewing

lens over the LCD.

INDICATOR KEYPAD & SWITCHES Back-printed polyester in four colors plus black.

Two membrane pushbutton switches, one rotary

switch with silicone boot for water seal.

FASTENERS Stainless Steel and/or Brass.

SENSOR WAND MATERIALS Aluminum = 6061-T6, Stainless Steel = #303

SENSOR BODY AND ROTOR Acetron GP (rotor body) & Ertalyte® TX, an

internally lubricated thermoplastic polyester that

provides enhanced wear over all previous rotor

materials.

SENSOR PROPELLER Glass-filled nylon. 2" diameter is supplied. Other

sizes are available for special applications.

ELECTRICAL CONNECTION Polyurethane jacketed, dual Aramid core, high

strength cable. Two-conductor sensor signal

system. Circular plastic,water resistant connector

with twist-lock operation. Connections use gold

plated contacts.

CABLE LENGTH Equal to wand at full extension plus five feet.

Special lengths to 1000’are also available.

SENSOR TYPE PHOTO-FIBER-OPTIC two-conductor electrical

with all electronics permanently encapsulated in

epoxy resin.

.....

2100-1514 and 2100-1518 wands

2100-STDX, 2100-LX, 2100-12, -13, -14 wands

*Specifications were correct at the time of publication; however, SWOFFER INSTRUMENTS, INC. reserves the right to change

design and operating specifications to further improve the instruments at any time and without notice.

MODEL 2100Product Description Sheet

Telescoping Wands

4 meters total length. Same as2100-1514 except each section isone meter long. Graduations aremarked every 5cm. The length ofboth the 2100-1514 and 2100-1518 rods can be increased ifneeded by adding extra sectionsof rod available as options. Theextra sections are offered with orwithout graduations. Supplied withsame equipment as the 2100-1514.

CombinationWands

Wading Wands

6/10 Depth Method Model 2100’s aredesigned to be used while wading in streamsand waterways. Use the rods to measure thestream depth then automatically place thesensor at 6/10 of the depth from the streamsurface, the best place to determine theaverage velocity of a water column in relativelyshallow water. All models include the 2100Indicator, two propeller rotor assemblies, aspare propeller, operating manual and astorage tube for the sensor wand. Indicator-to-wand connection cable length is five feetlonger than the wading rod. Wading rods forModels 2100-12, -13, -14 are in feet & tenthsand Models 2100-C80 and 2100-C140 have5cm graduations.

2100-12, quick profiling of shallowstreams

12’ total length. 1” diameter, thick-walled aluminumtube graduated from the bottom up in feet and tenths.Designed to be very stable in higher flows when the2½” dia. foot is placed on the stream bed. Wandbreaks down via threaded fittings into four sections ofthree feet each. Supplied with a Top Cap, Slider,and Foot as well as the Model 2100 Indicator,instruction manual, spare propeller, extra rotorassembly, 9 volt batteries and 25’ sensor cable. Topcap contains direction pointer for use when sensor isnot visible in deep water and the slider allows lockingthe sensor anywhere along the entire wandlength. Also available in a special version for divingapplications. See 2100-Diver specifications.

Current Velocity Meter

2100-C140to 145 cm

2100-C80to 86 cm

2100-1518 (Metric)2100-1514 (English)

2100-STDX2 to 9½’ reach(shown folded forstorage)

2100-LX, 4½’ to 19 ½’ extension

8” boom

4½’ to 19½’ extension. Sameas the 3000-STDX except eachtelescoping section is 4 feet inlength. A three foot adjustabledepth probe is provided.Telescoping sections aresecured by readily availablestainless steel hose clamps formaximum reliability and ease ofmaintenance.The Model 2100-LX includesthe 2100 Indicator, two propellerrotor assemblies, sparepropeller, instruction manualand storage tube for the sensorwand.

2100-LX2½’ to 9½’ telescoping extensionwand with no graduations. Sensor ismounted on an 8” boom to reach intoside sewers. A 2” boom is alsoavailable for stability in higher flowsand easier access through smallopenings in pipes. A two footadjustable depth probe is providedand attaches to the fully extendedlower section. The depth probe allowsrepeated accurate sensor placementindexed from the stream bed. The2100-STDX includes the Model 2100Indicator, two propeller rotorassemblies, spare propeller,operating instructions and a storagetube for sensor wand. Cable is 5’longer than the maximum extension.

2100-STDX

21pics08

2100-LX at work

2100-1514

2100-12, -13, -14, -C80, -C140

2100-13to 3.7 ft

2100-14to 4.7 ft.

2100-12to 2.7 ft

Pelican® is a registered trademark of Pelican Products Inc., Torrance, California.

MODEL 2100 CURRENT VELOCITY METER

For more compete descriptions and prices see the separate specification and price sheets.

All Model 2100 instruments are supplied with two 9 volt alkaline batteries, two complete rotor assemblies(2100-A21), a spare propeller, the 2100 Digital Indicator with a neck strap and a Sensor (2100-A22). The sensorwands are shipped in a PVC tube which serves as a permanent carrying/storage case.

The basic principle of the Swoffer sensor is simple; multiple bundles of fiber-optics, assembled into a propeller-driven rotor, gate a beam ofinfrared light from a photo diode to a photosensitive transistor. The rate of rotation of the propeller rotor is directly proportional to waterspeed, therefore pulses produced by the photo transistor over a given time are also directly proportional to water velocity.

The Model 2100 uses a propeller rotor which requires very little energy to activate, works in nearly all water conditions and producesconsistent, strong output pulses even at low speeds. The calibration curve for the rotors is linear and consistent in all normally occurringopen channel velocities. The propellers used with the Model 2100 were specifically designed for use in water so they do not need a shroudto protect them from the effects of turbulence. Because no shroud is used the propellers are better able to shed debris normally found insewers and natural streams.

The electronic half of the sensor consists of the latest optoelectronics and is epoxy encapsulated in a ½” (12.7mm) diameter acetal resinhousing for protection from chemicals and the elements. The sensor uses a two-wire signal system requiring as little as 3 volts for operationand can generate an output signal through over 1000 feet of cable. The sensor consumes very little power, produces four pulses perrevolution and can be manufactured in a variety of configurations and, most of all, it is sturdy and reliable.

The standard version of the propeller rotor assembly (2100-A21) uses a very low friction fiberoptic rotor, a polished and hardened stainlesssteel shaft, and a glass-filled nylon propeller. All rotor parts are easily replaceable in the field and spares are provided with every Model2100 instrument.

OPTIONS AND ACCESSORIES

2100-151-Slider foruse on any 1” rods.

2100-TSR Adapter forusing optical sensor on aUSGS style wading rod

Foot, Slider, Top Cap, 25’ sensor andRotors and parts. Common to the2100-1514 & -1518 models.

THE SWOFFER OPTICAL-ELECTRONIC SENSOR

3.170"

1.975"

0.500

2100-A22

2100-A21

2100-A232100-A25

2100-A26

2100-A27

2100-Prop

� Efficient propeller-driven Photo-Fiber-Optic sensor coupled with precision quartz crystalcontrolled electronics provide accurate repeatable data in all flow conditions.� The Model 2100 Indicator reads data in feet and meters per second. A toggle switchin the battery compartment changes from one to the other.� Powered by a single 9 volt transistor battery. (Space for a spare provided).� Three user selectable velocity averaging times in each mode. From 5 to 90 secondsin feet per second and from 1.5 to 30 seconds in meters mode.� Sensor components (propeller, rotor, and rotor shaft) easily and inexpensivelyreplaceable. Carry spares into remote locations and you’ll never have to return early becauseof a bent bucketwheel, lost sensor magnet or bent rotor shaft.� Wide choice of sensor carriers or “wands” to accommodate virtually any open streamvelocity measuring requirement.� Lightweight, portable system is easy to work with all day in the field. Indicatorweighs a little over a pound and a half.� A simple and accurate method of user-accomplished calibration is provided with theModel 2100. No other current meter offers the user a method of checking and changingcalibrations while in the field. Calibration settings for the feet and meters selection areeasily checked and changed any time.

Waterproof Carrying Cases