ST98HP and ST98UP Mass Flow Meters
for High Purity Air and Gas Applications
Mass Flow Meter SummaryThe ST98 High and Ultra High Purity mass
flowmeters are ideally suited for the pharmaceutical, biotech, food
& beverage and semiconductor industries. FCI's thermal dispersion
technology provides exceptionally accurate and repeatable
indications of mass flow rate. The sensing element combines two
matched precision resistance temperature detectors (platinum RTDs).
The active RTD is preferentially heated with a constant current. The
reference RTD is preferentially heated with a constant current. The
reference RTD senses at the process fluid temperature. As flow
passes the element a resistance differential is produced
proportional to the mass flow rate.
Condenser/evaporator flow control
air flow monitoring
gas discharge monitoring
CIP and SIP
flow and temperature monitoring
flow measurement and monitoring
Flow Range: 2.0 to 3183 SCFM [3.4 to 5409 NCMH]
in air at standard conditions for 70°F [21.1°C] and 14.7
psia [1.01325 bar(a)], typical to most gases. All gases must
be compatible with the flow element material.
Accuracy: (at calibrated conditions)
Flow: ± 1% reading + 0.5% full scale accuracy
Temperature: ± 2° F [± 1° C] (for display only; flow
rate must be grater than 5AFPS [1.5 AMPS])
With optional temperature compensation. Valid from 10% to 100% of full-scale calibration
Flow: Maximum ± 0.015% of reading/ºF up to 850ºF [±0.03% of reading/ºC up to 454 ºC]
Flow: ± 0.5% reading
Temperature: ± 1° F [± 0.6° C] (flow rate must be
greater than 5 AFPS [1.5 AMPS])
Turndown Ratio: Factory set and field adjustable from
10:1 to 100:1 within the calibrated flow range.
Standard: ± 30° F [± -1° C]
Optional: ± 100° F [± 38° C]
Agency Approvals: ASME BPE, Cenelec (T4 Rated), CE
Mark per EMC Directive 89/336/EEC; FM. CSA, and CRN pending.
N.I.S.T. Certified Test Lab Calibration: Standard
Flow ElementMaterials of Construction: All
welded 316L stainless steel
ST98 HP: 15 Ra electropolish (standard); 10 Ra
electropolish (optional); Hastelloy C with 15 Ra
ST98 UP: 10 Ra or 15 Ra electropolish (standard)
Operating Pressure: 0 to 250 psig [17 bar(g)].
Designed pressure to 1000 psig [69 bar(g)], maximum
operating pressure limited by customer specified process
Process temperature -40° to +350° F [-40° to +177° C];
integral electronics rated from 0° to 140° F
[-18° to +60° C]
Optional: -100° to +500° F [-73° to +260° C];
integral electronics rated to 140° F [60° C]
Flow Element Process Connection:
ST98 HP: 1 inch [25 mm] sanitary flange
ST98 UP: 1 inch [25 mm] VCR connector
Operating Temperature: 0° to 140° F [-18° to +60° C]
Input Power: 85 to 265 Vac, 22 to 30 Vdc; 7 watts
maximum, 230 mA maximum.
Current: 4 to 20 mA; 700 ohms maximum load.
Voltage: 0 to 10 Vdc, 0 to 5 Vdc or 1 to 5 Vdc;
100,000 ohms minimum load.
Communication Port: EIA-232 [RS-232] HART and
Profibus Communications (optional): Two way.
Optional Display: 2 lines, 16 characters per line.
Indicates flow rate and process temperature or totalized
Remote Encloruse (if selected):
Standard: NEMA/CSA Type 4 carbon steel, Type 4X
aluminum or stainless steel (meets IP66); nonincendive for
Class 1, Division 2, Groups A, B, C, D; Suitable for Class
II, Division 2, Groups F and G; Class III, Division 2.
Optional: NEMA/CSA Type 4X aluminum (meets IP66);
Nonincendive for Class 1, Division 1, hazardous locations,
Group B, C, D, E, F and G; and EEx d llC.