ST98B-CA Mass Flow Meter

Yellow FCI ST98 meter box and insertion sensor

Mass Flow Meter Summary

The ST98B-CA BASIC insertion type FlexMASSter sets a new standard for thermal mass flow meter performance, ease of use and installed value for Compressed Air service. This field selectable insertion unit features an application-specific instrument package for fast ordering, simple installation and precision measurement. 

The ST98B-CA BASIC features FCI's popular ST98 Series innovative flow element design with leading-edge flow transmitter electronics and temperature compensation to ensure optimum performance in process temperatures that vary up to ± 100°F. It is available with all of the below listed standard features for a very attractive price and with quick delivery as soon as 5 business days ARO.


  • Monitoring air flow to burners
  • Optimization of combustion air control systems


Flow Range: 6 SFPS to 600 SFPS  [1,83 NMPS to 183 NMPS] in compressed air at standard conditions 70°F [21,1°C] and 14.7 psia [1,01325 bar (a)].

Accuracy: (at calibrated conditions)  ± 1% reading + 0.5% full scale

Temperature Coefficient:
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 454ºC]

Repeatability: ± 0.5% reading

Turndown Ratio: Factory set at 100:1

Temperature Compensation: ± 30°F [± -1°C]

Temperature Range: 60°F to 120° F  [16°C to 49°C]

Pressure Range: 35 psig to 150 psig  [2,4 bar(g) to 10 bar(g)]

Enclosure: Powder coated carbon steel rated for NEMA and CSA Type 4, water and dust tight 
(meets IP66)

Agency Approvals:  FM, CSA, ATEX and CE Marking

N.I.S.T. Certified Test Lab Calibration: Standard

Flow Element

Materials of Construction: All welded 316L stainless steel for all wetted surfaces

Process Connection: 0.75" MNPT stainless steel compression fitting with stainless steel ferrule

Insertion Length (Field Adjustable)1:
  • 1" to 6" [25 mm to 152 mm]
  • 1" to 12" [25 mm to 305 mm]

Operating Temperature: Up to 200°F  [93°C]

Operating Pressure: Up to 150 psig  [10 bar(g)]

Note 1: After installation, stainless steel ferrule will be permanently fixed at the installed length

Flow Transmitter

Operating Temperature: 0°F to 140°F  [-18°C to 60°C]

Input Power (Field Selectable)2: 85 to 265 Vac or 22 to 30 Vdc; 16 watts maximum

Output Signal (Field Selectable):
  • Current: 4-20 mA source; 800 ohms maximum load (with field selectable low [3,6 mA] or high [21 mA] instrument fault indication; per NAMUR guideline NE 431).
  • Voltage: 0 Vdc to 5 Vdc, 1 Vdc to 5 Vdc or 0 Vdc to 10 Vdc; 100,000 ohms minimum load

Digital Communication Port: RS-232C

Optional Display: 2 lines, 16 characters per line. Indicates flow rate and process temperature or totalized flow (field selectable).

Optional Remote Configuration:
  • Flow Element Enclosure: Powder coated aluminum rated for NEMA Type 4X and hazardous locations Groups B, C, D, E, F and G, CENELEC EEx d IIC
  • Flow Transmitter Enclosure: Powder coated carbon steel rated for NEMA and CSA Type 4, water and dust tight (equivalent to IP66)

Optional Interconnecting Cable: 25' [7,6 m] PVC cable for remote configuration

Optional Communicator/Programmer: FCI Model FC88 hand-held plug-in interface

Note 2: Output signal is isolated from input power on Vac powered units only


  • ATEX
  • CCoE
  • CE
  • CPA
  • CRN
  • CSA
  • FM
  • IECEx
  • IECEx Test Report
  • HART