Series 9800MP Insertion Flow Averaging Tube (FAT) Thermal Mass Flow Meter


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Below are just some examples of our FAT installations for those “Hard to get” up stream distances and unknown profiles where you still need cross sectional coverage. Multiple probes can also be installed to cover equal quadrant areas and they connect to our “System Control Panel (SCP)” where each probe is averaged to provide the flow rate. This has dual effect of utilizing the flow averaging tube which does its averaging for its cross section prior to the SCP averaging the output of both probes.

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Master-Touch™ Series 9800MP Flow Meters

MP Series flowmeters are approved for use in hazardous locations (see specifications)

Insertion style thermal mass flowmeters include a sensor & probe assembly that is inserted into the process gas flow conduit to allow the process gas to flow across the flow inlet tube. Our insertion style flowmeters are available with 1/2″, 3/4″, or 1″ OD probes. Tube fittings and ball valve retractor assemblies, with or without a mounting flange, are also available from the factory as options. The tube length is determined by the size of the process pipe. Large ducts or stacks may require multiple averaging tubes to achieve the very best accuracy. For problematic or unique installations, please consult the factory.

Integral style thermal mass flowmeters have all of the electrical components and connections located within one enclosure. This enclosure may be rated for either hazardous environments (MP Series) or for ordinary, non-hazardous environments (MPNH Series), as necessary. The enclosure is mounted directly to the inline flow section or to the insertion probe assembly at the point of measurement. The enclosure includes the all of the electrical connections as well as the linearizing electronics and the display/keypad assembly.

Our patented Flow Averaging Tubes™ (FAT™) use the principle of convective heat transfer to directly measure mass flow, and are well suited to most applications with limited available straight run. In many installations, the up-stream straight run can be reduced to three diameters. The probe has a number of large diameter inlet ports along the length of the upstream impact surface. The pressure at each inlet port is averaged inside the tube to create the axial flow through the tube and across our flow sensor. The gas returns to the main flow stream through the ports located near the sensing elements. Anomalies in the actual flow profile or installations in non-circular ducts may still some require minor adjustment to achieve the best accuracy.


Linear signal output
0–5 VDC & 4–20 mA (Flow and Temperature)

Signal Interface
RS232 & RS485 Modbus RTU embedded
Optional HART or Profibus DP

LCD (flow rate, flow total, gas temperature)

Accuracy, including linearity (Ref.: 21°C)
±(1% of Reading + 0.5% of Full Scale + GTC)

±0.2% of Full Scale

Sensor response time
1 second to 63% of final value

Turn down ratio
100:1 @ 15 SFPM (.076 NMPS) Minimum Reading

Electronics PCB temperature range
-40° to 158°F (-40° to +70°C)

Environmental temperature range
-40° to 140°F (-40° to +60°C)

Gas temperature range
40°–150°F (5°–65°C)

Gas temperature coefficient (GTC)
0.05% Full Scale/°C @ 40°–100°F (5°–40°C)
0.10% Full Scale/°C @ 100°–150°F (40°–65°C)

Pressure rating maximum
500 PSI

Input power requirement
24VDC @ 250mA
115 VAC 50/60 Hz optional
230 VAC 50/60 Hz optional

Flow Transmitter power requirements
5 watts maximum

RAM Back-up
Lithium Battery

Wetted materials
316 Stainless Steel (Hastelloy optional)

Standard temperature & pressure (STP)
70°F & 29.92″ Hg (Air .075 lb./cubic foot)

NIST traceable calibration

NOTE: Specifications subject to change without notice. 

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