Master-Touch - Model Series 8000-8100MP - Inline Remote Thermal Mass Flow Meter
From Explosion Proof
Inline style thermal mass flow meters include a flow section that is usually specified to match the user’s flow conduit and is then plumbed directly into the process line. This design has the sensing elements mounted directly in the flow section for exposure to the process gas. Our inline style thermal mass flow meters are available in sizes from 1/4″ pipe through 4″ pipe or tube, and are provided with a variety of options such as MNPT ends, tube end fittings, butt weld ends, flanged end configurations, etc. as required. Pipe sizes in excess of 4″ typically require insertion style thermal mass flow meters.
Remote style thermal mass flow meters utilize two enclosures. One enclosure is mounted at the point of measurement on the flow section or on the probe assembly. This enclosure may be rated for either hazardous environments or for ordinary, non-hazardous environments, as necessary. The second (remote) enclosure is usually placed in a readily accessible location rated for non-hazardous conditions. (Contact the factory for information concerning remote explosion-proof enclosure). The remote enclosure includes the all of the electrical connections as well as the linearizing electronics and the display/keypad assembly. Only a four-wire, twisted-pair cable is required to carry the input power and flow signal between the two enclosures.
Thermal mass flow meters use the principle of convective heat transfer to directly measure mass flow. EPI’s proprietary thermal mass flow sensors use two ratiometrically-matched, reference-grade platinum Resistance Temperature Detectors (RTDs). The platinum sensing element wire is encapsulated in a 316 Stainless Steel sheath or, if specified, a Hastelloy C sheath. Our microcontroller operated smart sensor technology preferentially heats one RTD; the other RTD acts as the temperature reference. The process gas flow dissipates heat from the first RTD, causing an increase in the power required to maintain a balance between the RTDs. This increase is directly related to the gas molecular rate of flow. Our sensors are temperature compensated for a wide process gas temperature range and insensitive to pressure changes, so the output signal is a true mass flow rate signal.
Below is the standard remote configuration for pipe
Below configuration will support either 24VDC option or AC115/AC230 option to the remote enclosure.
The flow element transmitter is agency approved for explosion proof locations and the remote enclosure is used in ordinary area locations. See below options for upgrading remote enclosure to explosion proof.
CSA/CUS, ATEX, IECEx, KOSHA
Linear signal output
0–5 VDC & 4–20 mA (Flow and Temperature)
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 @ 10 SFPM (.051 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*
Gas temperature coefficient (GTC)
0.02% Full Scale/°C
Pressure rating maximum
500 PSI Std.
Input power requirement
24VDC @ 250mA
115 VAC 50/60 Hz optional
230 VAC 50/60 Hz optional
Flow Transmitter power requirements
5 watts maximum
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.