Brooks Instrument Quantim QMC Coriolis Mass Flow Controller

Low-flow Coriolis control for liquids and gases in one compact unit

The QMC is the third-generation Quantim low-flow Coriolis mass flow meter and controller from Brooks Instrument for liquids and gases. It is compatible in fit, form and function with the second-generation QMB models, and adds a modern digital architecture for fast response, more simultaneous outputs and better diagnostics. The controller version (QMCC) integrates the sensor, a coplanar control valve and PID control; the meter version is the QMCM.

A Coriolis sensor measures mass flow directly, independent of fluid type and process variables, so the chemistry or conditions can change without recalibration. With a range of 0.001 to more than 27 kg/hr, the device reports mass flow, volume flow, density and temperature together with diagnostic values. A service port on a 2.5 mm jack and the free BEST (Brooks Expert Support Tool) software simplify setup and troubleshooting.

Technical specifications

Using the QMC model code

Positions 1 to 4 select the QMCC controller or QMCM meter, position 5 the tube size and position 6 liquid or gas service. The valve is normally closed or absent for a meter, and the accuracy code gives 0.2 percent of rate for liquid, 0.5 percent for gas or 1.0 percent optional for gas. The enclosure code runs from IP40 with no area classification through IP66, UL recognised or listed Class 1 Division 2, ATEX Zone 2 and IECEx Zone 2 versions. Maximum pressure is 500 or 1500 psi, the tube is 316L stainless steel, and process connections include 5/16-24 UNF, tube compression from 1/16 inch to 1/4 inch and 6 mm, NPT female, VCR, VCO and 3.2 mm UPG, with metal seals available on VCR and UPG ports.

What to confirm before ordering

We need the fluid, minimum and maximum flow in mass units, inlet and outlet pressure, operating temperature, fitting, enclosure and area classification, signal type and seal material. The datasheet recommends additional upstream filtration for all installations and in-line filters of 1 or 10 micron on the smallest controller, and it notes that in-line filters are not recommended in moisture-sensitive applications. Units are purged to a dew point below minus 40 C before shipment.

How the Brooks QMC works

The fluid flows through a vibrating tube. The mass flow changes the motion of the tube, and the sensor measures that change directly. On the controller version, a coplanar control valve and PID control then hold the flow at the setpoint.

Where the QMC is used

• Low-flow liquid dosing
• Low-flow gas control
• Process lines where the fluid changes
• Replacement of second-generation QMB units
• Skid and laboratory systems

Selection checklist for the QMC

• Controller or meter version
• Liquid or gas
• Tube size
• Flow range
• Differential pressure
• Operating pressure
• Wetted materials
• Seal material

Installation, commissioning and maintenance notes for the QMC

Mount the unit where vibration is low and keep the line full of fluid. Connect power and the outputs, then use the service port and BEST software for setup. Zero the unit with no flow and check the diagnostic values at regular intervals.

Requesting a quotation for the Brooks QMC

Please send the fluid, the flow range, the pressure and the version needed. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

QMC generation

It is the third-generation Quantim low-flow Coriolis mass flow meter and controller.

QMC fluids

It is made for liquids and gases.

QMC compatibility

It is compatible in fit, form and function with the second-generation QMB models.

QMC digital architecture

A modern digital architecture gives fast response, more simultaneous outputs and better diagnostics.

QMC versions

The controller version is the QMCC and the meter version is the QMCM.

QMC controller parts

The QMCC integrates the sensor, a coplanar control valve and PID control.

QMC direct measurement

A Coriolis sensor measures mass flow directly, independent of fluid type and process variables.

QMC no recalibration

The chemistry or conditions can change without recalibration.

QMC flow range

The range is 0.001 to more than 27 kg/hr.

QMC reported values

It reports mass flow, volume flow, density and temperature with diagnostic values.

QMC service port

A service port on a 2.5 mm jack is provided.

QMC BEST software

The free BEST software simplifies setup and troubleshooting.

QMC tube sizes

Tube sizes are 2, 3 and 4.

QMC controller liquid flow

Nominal liquid flow on the controller is 0.15, 0.78 and 7.97 kg/hr.

QMC meter liquid flow

Nominal liquid flow on the meter is 0.19, 1.30 and 13.50 kg/hr.

QMC controller gas flow

Nominal gas flow on the controller is 1051, 2955 and 24787 sccm.

QMC meter gas flow

Nominal gas flow on the meter is 1432, 7207 and 53116 sccm.

QMC minimum liquid flow

The minimum liquid flow is 0.001, 0.010 and 0.100 kg/hr.

QMC response time

The controller responds in under 2 s and the meter in under 0.5 s.

QMC turndown

The turndown is 100:1 or down to the minimum flow.

QMC operating temperature

The operating temperature is 0 to 60 degrees C.

QMC differential pressure

Liquid needs 10 to 200 psi and gas 10 to 150 psi.

QMC maximum pressure

The maximum operating pressure is 500 psi, with 1500 psi optional.

QMC density range

The density range is 0 to 2.0 g/cc.

QMC wetted materials

Wetted parts are 316L, high-alloy ferritic stainless steel and 17-7PH.

Flow records for the QMC

Record the fluid, the setpoint and the date of each zero check.

Choosing the right QMC tube size

Choose the tube size from the flow range and the pressure drop the line allows.

Documents and quotation

The manufacturer datasheet (8 pages) is attached to this page as a download. For a quotation, send the full model code and the process data to Seven Star LLC in Muscat; browse more instruments in the Flowmeters category. We supply this item as an independent supplier, so please confirm availability and delivery with us.