Atec D902 User Manual

U LTRASONIC FLO W M E TE R

Series 902

Portable Enhanced Doppler

Series 902 Portable Enhanced Ultrasonic Doppler

Flowmeters measure solids-bearing or aerated

liquids in metal or plastic pipe. Proprietary

circuitry allows this instrument to operate with

lower concentrations of suspended solids than

any competitive Doppler flowmeter--expanding

the instrument's range of applications and

reliability. Clamp-on, non-invasive transducers

permit the instrument to be installed in minutes

without interrupting system pressure or flow.

The watertight case contains a rechargeable

battery that can operate the unit continuo u s l y

for 8 hours. The Series 902 transmitter has a

full keypad designed for simple field setup

and application versatility. The two-line, backlit,

alphanumeric display shows instantaneous flow

rate and totalized flows in a variety of user

selectable engineering units.

Fea t u re s

The system can be field configured to pipe sizes ranging from 0.25 to 120 inches [6 to 3050 mm]

Non-fouling transducer is immune to build-up of grease, paraffin and other coating materials

Solid-state measurement never requires re-calibration and is virtually maintenance-free

A p p l i ca t i o n s

Wastewater sludges

Ground water

Flow surveying

Remote field site flow tests

Operates with relatively clean liquids as well as liquids with concentrations of suspended solids or aeration

Does not require long straight runs of pipe

Rugged NEMA 4X design permits extended outdoor and rough service use

Industry standard outputs allow direct interface to loggers and controls systems

Used as a flow prover to other flow technologies

Mining recirculate

Pump output verifications

Sewage lifting station monitoring

U LTRASONIC FLO W M E TE R

Principles of Opera t i o n

TOP VIEW OF PIPE

RECEIVING

TRANSDUCER

TRANSMITTING

TRANSDUCER

Liquids with Suspended Solids or Aeration

Ultrasonic Doppler flowmeters operate by transmitting and receiving ultrasonic sound signals in liquids. An instrument, such as the Dynasonics Series 902, incorporates dual transducers that are clamped on opposite sides of a liquid filled pipe. Each transducer contains a piezoelectric cry s t a l . R e f e rring to the above illustration, the G1transducer transmits an ultrasonic signal through the pipe wall into the liquid. A portion of this signal is reflected by suspended solids, entrained gases or flow turbulence moving with the fluid, back toward the second transducer, G2. E l e c t ronic circ u i t ry compares the transmitted frequency with the received fre q u e n c y. The diff e r ence, or frequency shift, is pro p o rtional to fluid velocity, in accordance with principles developed by Christian Johann Doppler. If the liquid is not moving (a zero flow condition) the transmitted and received frequencies are identical.

The Series 902 features advanced signal processing and an exclusive auto-adapting digital filter to produce accurate and stable indications of flow rate and totalized flows. A full function keypad allows field configuration of pipe size, engineering units, the 4-20mA output and all operating parameters.

Part Number Co n s t r u c t i o n

90° ELBOW

Fluid Velocity }G1-G

Clean, Non-aerated Liquids

TRANSDUCER/TRANSMITTER

(Includes: Accessory pouch, standard transducer, mounting straps, acoustic couplant and power cord.)

D90

Transmitter Type

2) U.S. Units

3) Metric Units

Power Supply

A) 115 VAC B) 230 VAC C) 100 VAC D) 200 VAC E) 12 VDC

Outputs

1) 4-20 mA

Relays

N) None (Std)

Totalizer

A ) Six digit, resettable

Approvals

N) None

Options

N) U.S. power cord (Two spades and ground) E) English power cord (Three rectangular spades) G) German power cord (Two round spades)

D-902 ACCESSORIES

D070-1006-001 High Temp Transducer D070-1004-003 Small Pipe Transducer D010-0200-100 Transducer cable extension, 20 feet [6 m]

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