Brooks MT 3819 DN40 identifies the size-12, 1-1/2-inch flanged version of the MT 3819 variable-area flowmeter. DN40 is a nominal connection-size designation, not a complete Brooks order number. The MT 3819 uses an ETFE-lined stainless-steel metering tube for aggressive liquid and gas service, with configurations determined by the complete model code
Configurations vary. Verify the exact unit before choosing a replacement.
Application classIndustrial automation and process equipment
CategoryFlow Control
Specifications
Identification
Manufacturer
Brooks Instrument
Product family
MT 3819
Meaning of DN40
Nominal connection size; Brooks meter size 12 with 1-1/2-inch flanged connections
Measurement
Measuring principle
Metal-tube variable-area measurement with magnetically coupled dial indication
Process
Documented service
Aggressive liquids and gases
Construction
Standard metering tube
316L stainless steel with ETFE (Tefzel) lining
Standard flanges and end fittings
316L stainless steel
Standard float for meter size 12
PVDF
Performance
Standard flow accuracy
±2% of full scale in the North American data sheet; European configurations use VDI/VDE accuracy classes
Optional flow accuracy
±1% of full scale
Repeatability
0.25% of full scale
Capacity
DN40 water capacity choices
3,000, 4,000, 5,000 or 6,000 l/h nominal maximum, according to float code A, B, C or D
DN40 air capacity choices
55, 74, 92 or 110 scfm at 70°F and 14.7 psia; 87, 110, 140 or 170 Nm³/h at 0°C and 1.013 bar(a)
DN40 pressure-drop choices
50, 75, 85 or 120 mbar, according to float code
Operating limits
Tefzel-lined gas-service pressure
Operating pressure must exceed 29 psia / 2 bar(a)
Maximum process-fluid temperature
150°C; actual limit remains subject to indicator electronics, ambient temperature and hazardous-area approval
Connections
Documented flange types
ANSI 150 RF, ANSI 300 RF or DIN PN40 RF, depending on model code
Installation
Orientation
Vertical, inlet at bottom and outlet at top; install within 5° of true vertical
Dimensions
Flanged face-to-face length
250 mm for meter size 12
Enclosure
Indicator housing
NEMA 4X construction; inductive-alarm documentation specifies Type 4X / IP65
What Does DN40 Mean?
DN40 defines the nominal process-connection size rather than the complete flowmeter configuration.
Segment
Field
Interpretation
DN
Nominal diameter
Metric nominal pipe-size designation
40
Nominal size
Brooks maps DN40 to meter size 12 with 1-1/2-inch flanged connections
Observed Brooks Model Code 3819B14BAHBD1A1
This archived full model code represents one configured DN40 meter. Its range, scale, alarm and power-supply selections do not apply to all DN40 units.
Segment
Field
Interpretation
3819/B
Basic model
Metal-tube flowmeter with vertical inlet and outlet
1
Material
316L stainless steel with ETFE lining
4
Meter and connection size
Meter size 12; DN40 / 1-1/2-inch flanged
B
Float/capacity option
Nominal maximum water capacity 4,000 l/h; corresponding tabulated air capacity 74 scfm / 110 Nm³/h
A
Connection
ANSI 150-pound RF flange
H
Accuracy, scale and fluid
VDI/VDE Class 2.5, direct-reading liquid scale
B
Indicator
Standard aluminum indicator with one Pepperl+Fuchs inductive alarm switch
D
Relay/power supply
One-channel intrinsically safe relay/power-supply unit, 115 VAC
1
Certification option
None
A
Accessory option
None
1
Software revision
None / not applicable because no microprocessor transmitter is selected
Legacy and Current Nomenclature
Current Brooks MT3809-series literature lists a TFE-lined configuration with substantially similar Tefzel-lined construction and size tables, while the legacy documents identify this product as MT 3819. Similar family characteristics do not establish a drop-in replacement. Replacement selection requires confirmation of capacity, calibration fluid, flange standard and pressure class, wetted materials, alarm electronics, approvals and face-to-face dimensions.
