Below is our insertion style Agency approved Explosion Proof enclosure. Model numbers based on probe OD.
Master-Touch™ Series 8800MP 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 sensing elements. 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 must be specified upon ordering. For other probe diameters and lengths, 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.
Thermal mass flowmeters 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.
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 @ 15 SFPM (.076 NMS) 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: Specification subject to change without notice.