Insertion Flow Meter, Master-Touch 9800MP HAZ FAT

Description

The Master-Touch 9800MP HAZ FAT insertion flow meter is a rugged, cleanable, thermal mass flow meter for gases. These units consist of a sensor assembly which utilizes two RTD (Resistance Temperature Detector) sensing elements. The sensors consist of reference grade platinum, ceramic, glass, as well as stainless steel. Two platinum resistance sensors are built upon the ceramic substrate and then receive a thin glass coating. The assembly is then slipped into a stainless-steel sheath for corrosion and abrasion resistance.

The sensor assembly is large, rugged, and relatively insensitive to dirt buildup. During operation, the temperature sensor constantly measures the ambient temperature of the gas and maintains a reference resistance on one side of a bridge circuit. The second sensor is forced through self-heating to a constant temperature above that of the gas stream and is controlled by the temperature sensor as well as the bridge circuitry. The bridge maintains the overheat temperature and also counterbalances the temperature effects through EPI’s proprietary temperature compensation techniques.

Features a certification for hazardous locations (HAZ) with an explosion‑proof enclosure, thus ensuring safe operation in classified environments.
Employs Flow Averaging Tube (FAT) technology to average multiple sensing points and deliver accurate mass flow measurements, even in short straight‑run ducts.
Provides direct mass flow output without the need for separate temperature or pressure compensation, thus simplifying system integration and control.
Perfect for easy insertion style mounting into existing pipelines or ducts, which minimizes installation costs as well as downtime.

Master-Touch 9800MP Insertion Flow Meter for Hazardous Locations

Insertion style thermal mass flow meters include a sensor and probe assembly that inserts into the process gas flow conduit. This allows the process gas to flow across the flow inlet tube. Master-Touch 9800MP insertion flow meters 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 flow meters have all the electrical components and connections within one enclosure. This enclosure offers a rating for hazardous environments. The enclosure can mount directly to the inline flow section or to the insertion probe assembly at the point of measurement. The enclosure includes all the electrical connections as well as the linearizing electronics and the display / keypad assembly.

Flow Averaging Thermal Mass Flow Meter from Eldridge Products Inc. (EPI)

Our patented Flow Averaging Tubes (FAT) use the principle of convective heat transfer to directly measure mass flow and are suitable for most applications with limits in available straight run. In many installations, the up-stream straight run can reduce to three diameters. The probe has several large diameter inlet ports along the length of the upstream impact surface.

The pressure at each inlet port averages inside the tube to create the axial flow through the tube and across the flow sensor. The gas returns to the main flow stream through the ports 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.

Superior Insertion Flow Measurement and Calibration

EPI insertion flow meters provide accurate, consistent, and rapid real-time flow measurement with a sensor that is both temperature and pressure corrective. In addition, each flow meter features calibration using standards traceable to the National Institute of Standards and Technology (NIST).

Accuracy: ±(1% of reading + 0.5% of full scale + GTC)
Repeatability: ±0.2% of full scale
Sensor response time: 1 second to 63% of final value
Gas temperature coefficient (GTC): 0.02% full scale/˚C
Gas pressure effect: negligible over ±50% of factory calibration pressure

Master-Touch 9800MP HAZ FAT for Hazardous Locations

EPI’s HAZ series full assembly is suitable for use in hazardous locations with T2, T3, and T4 approvals available in domestic and also in international markets. The diecast aluminum, NEMA Type 4X watertight enclosure is both flame and explosion-proof and features a corrosion resistant finish.

Domestic: CSA/CUS