Flow System - Ametek mocon Dansensor MAP Mix ProVectus User Manual

12 User Guide

Flow System

The figure below shows the internal flow system of the Dansensor® MAP Mix Provectus 2-
Gas and 3-Gas versions respectively.
1
GAS
IN
GAS 2
IN
GAS 1
IN
GAS 2
IN
3
GAS
IN
The principle used in the gas mixer is based on the use of "Mass Flow Controllers" (MFC). For
each gas line in the mixer there is an MFC controlling the flow of the respective gas. The
mixture is programmed by the software and each MFC is then set to a flow proportional to the
required mixture of the respective gas.
Example: Total flow required = 500 l/min, 30% CO
necessary flow of each gas input (150l/min CO
deliver these flows.
Each MFC has a PID controller which controls the proportional valve based on the measured
flow from the Mass Flow Sensor and the set point.
The pressure drop through the gas mixer is much lower than on traditional mechanical mixers
and this assures maximum usage of the input gas pressure ranges and also allows running at
lower input pressures (depending on the back pressure at the output).
Each gas line is fitted with a pressure sensor (PS) and in case of low gas supply pressure a gas
input pressure alarm can be set to give an early "Alarm" signal to alert user of low gas supply
pressure.
If input pressure exceeds the minimal or maximal functional levels a "Fault" relay will be
activated. This can be used to stop the packaging machine.
P/N 300862-K
11/2019
Pressure Mass Flow
Sensor 1 Sensor 1
Proportional
Valve 1
PS F1
PV
Pressure Mass Flow
Sensor 2 Sensorr 2
Proportional
Valve 2
PS F2
PV
Pressure Mass Flow
Sensor 1 Sensor 1
Proportional
Valve 1
PS F1
PV
Pressure Mass Flow
Sensor 2 Sensor 2
Proportional
Valve 2
PS F2
PV
Pressure Mass Flow
Sensor 3 Sensor 3
Proportional
Valve 3
PS F3
PV
EN Dansensor
Pressure
MFC 1
Sensor 4
PS
MFC 2
2-GAS
MFC 1
Pressure
Sensor 4
PS
MFC 2
MFC 3
3-GAS
and 70% N ; the software calculates the
2 2
and 350l/min N
2 2
MAP Mix Provectus
®
FLOW/BUFFER
PRESSURE
MIX
OUT
FLOW/BUFFER
PRESSURE
MIX
OUT
) and the MFC´s are set to