Flow Control

QMBS4L1A3D1A1CM2C1A1E

Brooks Instrument Quantim QMBS4 Modbus Coriolis Mass Flow Sensor

About this part

Brooks Instrument QMBS4L1A3D1A1CM2C1A1E is a Quantim QmBS4 Coriolis mass flow sensor with Modbus RS-485 output. Its supported model-code prefix specifies the large tube size, liquid as the primary fluid type, no pressure transducer, no valve, 0.5% liquid-flow accuracy with a 316L sensor tube, and a NEMA 4X/IP65 hazardous-area enclosure. Published QmBS4 performance is 13.5 kg/hr nominal and 27 kg/hr maximum for liquids. The supplied identifier omits positions required by the published full ordering-code format; its pressure rating, process connection, seals, certifications, filter, and OEM option are therefore not asserted

Configurations vary. Verify the exact unit before choosing a replacement.

Specifications Documents (4)Photos (0)Listing history

No archived photo available

Key Facts

ManufacturerBrooks Instrument Quantim QmBS

Part numberQMBS4L1A3D1A1CM2C1A1E

Product familyConfiguration-specific

Device typeCoriolis mass flow sensor

Configuration statusConfiguration varies

Application classIndustrial automation and process equipment

CategoryFlow Control

Specifications

Identification

Manufacturer	Brooks Instrument
Product family	Quantim QmBS
Base model	QMBS flow sensor with Modbus RS-485 output

Measurement

Measuring principle

Direct Coriolis mass-flow measurement

Configured Options

Tube size	4 — large sensor
Primary fluid type	Liquid; switching to gas is permitted after rezeroing
Pressure transducer	None
Valve	None; measurement-only sensor
Specified mass-flow accuracy	±0.5% of rate or ±[(zero stability ÷ flow rate) × 100]% of rate, whichever is greater
Enclosure and area classification	NEMA 4X/IP65; Class I, Division 2/Zone 2
Surface finish	Standard, 32 Ra
Sensor tube material	316L stainless steel

Tube Size 4 Performance

Nominal liquid flow	13.5 kg/hr (29.77 lb/hr)
Maximum liquid flow	27 kg/hr (59.54 lb/hr)
Typical gas flow	3.640 kg/hr; 50,350 sccm on air at stated reference conditions
Zero stability	0.0040 kg/hr (0.0088 lb/hr) with stainless-steel sensor tube

Documented QmBS Family

Mass-flow repeatability	±0.05% of rate or ±[0.5 × (zero stability ÷ flow rate) × 100]% of rate, whichever is greater
Density range	0–0.3 and 0.5–2.0 g/cm³; consult Brooks for 0.3–0.5 g/cm³
Density accuracy and repeatability	Accuracy ±0.005 g/cm³; repeatability ±0.002 g/cm³
Ambient and process temperature	0–65°C (32–149°F); device-temperature accuracy ±0.5°C (±1.0°F)

Materials

Documented wetted materials	316/316L stainless steel; the configured sensor-tube code specifies 316L stainless steel
Housing	Polyurethane-painted aluminum and stainless steel

What Does QMBS4L1A3D1A1CM2C1A1E Mean?

The published June 2006 ordering table supports the leading fields shown below. The remaining compact suffix cannot be aligned conservatively with every required field.

Segment	Field	Interpretation
QMBS	Base model	Quantim flow sensor with Modbus RS-485 output
4	Tube size	Large sensor; 13.5 kg/hr nominal liquid flow
L	Primary fluid type	Liquid; liquid/gas switching requires rezeroing
1	Pressure transducer	No transducer
A	Valve type	No valve
3	Accuracy	Optional 0.5% of rate for liquid measurement with stainless-steel sensor tube
D	Enclosure and area classification	NEMA 4X/IP65; Class I, Division 2/Zone 2
1	Surface finish	Standard, 32 Ra
A	Sensor tube material	316L stainless steel
1CM2C1A1E	Remaining suffix	Not positionally complete under the published full model-code revision; no further exact options are asserted

Tube Size 4 Flow Capability

Flow limits depend on the process fluid and stated reference conditions.

Medium	Documented flow	Reference basis
Liquid	13.5 kg/hr nominal; 27 kg/hr maximum	Water at reference conditions; volumetric values assume density of 1 g/cm³
Gas	3.640 kg/hr; 50,350 sccm typical	Air at 70°F, 500 psia inlet, and approximately 1 bar pressure drop

Compatibility and Replacement

Brooks classifies the QMB series as legacy and directs customers to the current Quantim QMC family.

LifecycleQMB is listed as a legacy Brooks Instrument series; the manufacturer’s upgrade table maps Quantim QMB to Quantim QMC.

Compatibility boundaryBrooks describes QMC as form-, fit-, and function-compatible with second-generation QMB models. Do not assert plug-and-play electrical or protocol compatibility for this QMBS remote sensor: QmBS documentation specifies Modbus and a circular sensor connection, while current QMC documentation specifies RS485 S-Protocol and different configured I/O arrangements.