Dynasonics 902 Data sheet

PORTABLE ENHANCED
DOPPLER FLOW METER

The Series 902 Portable Enhanced Ultrasonic
Doppler Flow Meter provides accurate and
reliable readings on closed full pipe applica
containing relatively clean liquids as well as
liquids with higher concentrations of
suspended solids or aeration. Clamp-on
non-invasive transducers permit the
instrument to be installed in minutes without
interrupting the system pressure or flow,
providing a simple and cost-effective solution
to flow verification. The Series 902 transduc
function on metal or plastic pipes size ¼” (6
mm) and above. They have a NEMA 6P
(IP-68) rating, and have the ability to work
with temperatures up to +400 °F (+200 °C).

tions

ers

Series 902

The Dynasonics Series 902 is designed for
rugged field use in its NEMA 4 watertight
enclosure. The rechargeable battery housed
inside of the 902 enclosure provides a full
eight hours of continuous operation. A
complete 902 flow meter system includes
one set of transducers, one tube of acoustic
couplant, two mounting straps, a power cord
and a 4-20 mA cable.

FEATURES

Clamp-on non-invasive transducers provide simple and
cost effective flow measurement.

NEMA 6P (IP-68) rated transducers and NEMA 4
(IP-65) enclosure.

Reliable readings on closed full pipes
size ¼" (6 mm) and above.

Rechargeable battery with eight hours of continuous
operation included.

Standard 4-20 mA output.

Ability to measure relatively clean liquids as well as
liquids containing higher concentrations of suspended
solids or aeration.

Accuracy of ±2% full scale and repeatability of ±0.4%
of full scale.

Measures fluid velocities from 0.5 to 20 FPS (0.15 to 6 MPS).
For applications such as ground water, lifting stations,

wastewater sludges, and mining recirculate.

DIVISION OF RACINE FEDERATED INC.

www.dynasonics.com800.535.3569

TM

PRINCIPLE OF OPERATION / TRANSDUCER OPTIONS

Series 902 Series 902

The Series 902 flow meter operates by transmitting ultrasonic
sound from its transmitting transducer through the pipe wall
into the flowing liquid. Each transducer contains piezoelectric
crystals to transmit this signal. The sound will be reflected by
useful sonic reflectors

suspended within the liquid
recorded by the receiving transducer (see Figure 1). If the
sonic reflectors are moving within the sound transmis

and

sion path,
sound waves will be reflected at a frequency shifted (Doppler
shift) from the transmitted frequency. The difference
the reflected frequencies and transmitted frequencies is
proportional to the speed of the

sonic reflectors, resulting in a

between

directly

liquid flow rate that is converted to various user defined
measuring units.

DIMENSIONAL

S

PECIFICATIONS

MECHANICAL DIMENSIONS: INCHES (mm)

11.60

(294.64)

Figure 1

17.50

(444.50)

6.90

(175.26)

D902/D903

Two Coiled Cables
Standard Length
20 Feet (6 mm) each

D912/D913

Two Coiled Cables
Standard Length
20 Feet (6 mm) each

4.38

(111.3)

4.05

(102.9)

1.91

(48.5)

1.45

(36.8)

1.70

(43.2)

1.38
(35)

D922/D923

Two Coiled Cables
Standard Length
20 Feet (6 mm) each

D932/D933

Two Coiled Cables
Standard Length
20 Feet (6 mm) each

TRANSDUCER IN

4.38

(111.3)

4.05

(102.9)

POWER IN

4-20 mA SIGNAL IN

1.91

(48.5)

3.24

(82.3)

1.45

(36.8)

2.85

(72.4)

1.38
(35)

MAX. PIPE

DIA

1.38
(35)
MAX.

PIPE

DIA