Series 8600-8700MP Inline Thermal Mass Flow Meter


This series meter is great for where agency approvals are required for Explosion Proof area locations. See specifications.


Thermal Mass Flow Meters


Master-Touch™ Series 8600MP–8700MP Flow Meters

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

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.

Integral style thermal mass flow meters 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.

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.



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

Event Relay Rating one with Frequency or two, 1 Amp @ 30Vdc (33W)

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 @ 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*
-40°–392°F (-40°–200°C)

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

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.

Product Details

Below is the standard remote configuration for pipe <= 2-1/2″. 3″ thru 4″ flow bodies come with flanges as standard. Options for ends can be MNPT, Flanged, Butt end. 3/4″ pipe and greater normally come with FSA (flow conditioning plates).


Master-Touch™ Series 8600MP & 8700MP Flow Meters Specifications

Model Numbers

8636MP 1/4″ X 6″ 3.5
8649MP 3/8″ X 6″ 6.0
8659MP 1/2″ x 7″ 13.0
8669MP 3/4″ x 7″ 60.0
8689MP 1″x 8″ 90.0
8710MP 1 1/4″ x 10″ 150
8712MP 1 1/2″ x 14″ 200.0
8716MP 2″ x 14″ 350.0
8720MP 2 1/2″ X 14″ 500.0
8724MP 3″ x 14″ 750.0
8732MP 4″ x 14″ 1350.0