Product Description, Diagrams and Technical Data

1. DM3 Density Meters
The DM3 Density Meter© is a major advancement in continuous in-line density measurement of mining,
dredging, sewage and similar slurries in pipes from 50 - 1000mm (2” – 40”) internal diameters. DM3
operates at < 0.5% full scale accuracy and is repeatable to ± 0.1% full scale.
DM3 incorporates linear, accurate and direct
measurement of mass per unit volume to calculate
density. It provides an innovative alternative to
ineffective techniques currently used which include
nuclear, ultrasonic and microwave methods. DM3
is simple to maintain, vibration insensitive, partially
land buriable and tilt and roll compensated
for dredging at sea. The measurement may be
calibrated in % dry solids, wet density or specific
gravity (sg).
Slurry is continuously weighed using a patented,
high resolution density transducer as it passes
through an obstruction free, gum rubber lined flow
tube. The flow tube is of optimal length to provide
a truly representative mass of the slurry. The density of the slurry is then measured by the transducer
at 110 times/second to ensure accurate and repeatable sensing. The flow tube also provides the
necessary straight upstream pipe run for magnetic flow meters used in DM3 mass flow systems.
The DM3 flow tube has reinforced walls up to 36mm (1.5”) thick and incorporates a highly abrasion
resistant natural gum rubber liner. As such, long life is assured, even with the most abrasive media
containing sharp rocks, sand and tailings. Alternative options are available for special applications
which deal with high pressures and/or temperatures. The DM3 flow tube is uniquely and easily field
replaceable.
The density transducer provides a signal to a remote microprocessor based DM3 Transmitter. With the
push of a button, diagnosis with NIST traceable calibration and verification of DM3 is accomplished,
without the need for test weights. Display, analog signals and a comprehensive selection of digital
communications are available.
Features
»» Accurate, uniquely NIST traceable, direct mass measurement for % dry solids, wet or dry sg
»» Obstruction free, natural gum rubber, abrasion resistant flow tube with up to 36mm thick walls
»» Simple to install and maintain
»» Unique field replaceable flow tube
»» Certified CE for electro-magnetic compatibility and CSA, UL Explosive Proof Class 1, Div. 2
»» Fail safe design – slurry in flow tube contained within external pressure chamber
»» SG digitally programmable by remote microprocessor for ranges 1.0 – 1.5 to 1.0 – 3.0
»» Mass flow systems available using magnetic flow meters and mass flow computer, wet or dry units
»» Buriable on land or wave roll compensated for sea-going dredgers
DM3 Specification DM3-0812© Continuous development may cause this specification to change without notice.

2. C Diameter of ANSI 150 Flange
Process Flange
A
C
B
343mm
13.5”
L/2
L 20”
508mm
DM3 Dimensions and Weights
Exact Internal Dimensions Approx
Diameter L A B C Diameter Weight
inch mm inch mm inch mm inch mm inch mm lbs kg
2” 51 96.00 2438 20.0 508 15.0 381 12.7 323 630 307
3” 76 96.00 2438 20.0 508 15.0 381 12.7 323 694 315
4” 102 96.00 2438 20.0 508 15.0 381 12.7 323 721 328
6” 152 108.0 2743 23.0 584 18.0 457 20.0 508 829 377
8” 203 108.0 2743 23.0 584 18.0 457 20.0 508 1239 563
10” 254 108.0 2743 23.0 584 18.0 457 20.0 508 1504 684
12” 305 126.0 3200 24.0 610 20.0 508 24.0 610 1582 719
14” 356 126.0 3200 24.0 610 20.0 508 24.0 610 1638 745
16” 406 126.0 3200 24.0 610 23.0 584 30.0 762 1941 882
18” 457 126.0 3200 24.0 610 23.0 584 30.0 762 2345 1066
20” 508 126.0 3200 24.0 610 23.0 584 30.0 762 2502 1137
24” 610 126.0 3200 34.0 864 29.0 737 42.0 1067 3056 1389
28” 711 126.0 3200 34.0 864 29.0 737 42.0 1067 3283 1492
30” 762 126.0 3200 34.0 864 29.0 737 42.0 1067 3433 1560
32” 813 150.0 3180 36.0 914 32.0 812 48.0 1219 4003 1820
34” 864 150.0 3180 36.0 914 32.0 812 48.0 1219 4100 1864
36” 914 150.0 3180 40.0 1016 34.0 864 52.0 1320 4658 2117
40” 1016 150.0 3180 42.0 1067 36.0 914 56.0 1422 5290 2405
DM3 Specification DM3-0812© Continuous development may cause this specification to change without notice.

3. DM3 Technical Data
Accuracy: < ± 0.5% of span
Repeatability: ± 0.1% of span
Non-Linearity: ± 0.018% of span
Hysteresis: ± 0.025% of span
Roll Error (Dredgers): ± 20° longitudinal or transverse roll error < 0.2% on zero or full scale
Output Temperature Effect: ± 0.0014% of span per º C or ± 0.0008% per º F
Specific Gravity Ranges (SG): Standard 1.0 – 1.5, 1.0 – 2.0, 1.0 – 3.0 Intermediate and lower ranges
digitally adjustable
Maximum Pressure & Temperature: 10 bar g (150 psig) at 60º C (140º F) Compliant to European PED 97/23/
EC to requirements of Article 3, Paragraph 3 SEP
Minimum Temperature: - 25º C (- 13º F)
Storage Temperature: - 40º to + 80º C (- 40º to + 175º F)
Environmental Protection: NEMA 6 and IP68 submersible
Construction: Enamel bonded carbon steel (suitable for partial burying)
Connections: Removable flanges to allow rubber flow tube replacement
Flanged Connections: ANSI 150 ff, DIN/BS 4504 PN10, AS 2129 Table D, JIS 10k rf
Standard Flow Tube Material: Internally reinforced heavy duty rubber, natural gum rubber lined
Electromagnetic Compatibility: CE to DIN EN 50 081-2 and DIN EN 50 082-2
Explosion Proof Option: UL and CSA Class 1, Division 2 Traceable Standards:
Density Tracability: USA NIST, Canadian Weights and Measures and other international
standards
Installation
The DM3 must be installed horizontally, typically with the naked eye to within 10° in two planes. While
DM3 is highly insensitive to shock and vibration, it is recommended to be mounted with pipe clamps
each end around the C diameter, with anchor posts fixed firmly to the ground. Alternatively, DM3 may
be partially buried in pipes running over ground.
It is recommended that the DM3 is installed at a minimum of three diameters of straight lengths of
pipe after a bend for maximum service life of the flow tube, or a minimum six straight diameters
after a pump to ensure good slurry mixing. In mass flow systems a magnetic flow meter is installed
immediately downstream of the DM3. As such, DM3 provides the requisite upstream straight pipe runs
necessary for the magnetic flow meter, which then requires two diameters downstream of it.
For optimum service life of the flow tube, the DM3 should not be installed immediately after pipes of
greater internal diameter. Please note the exact internal diameter from the table above. The same or
nearest smaller sized USA or metric rubber hoses or HDPE pipes are recommended.
DM3 Specification DM3-0812© Continuous development may cause this specification to change without notice.