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ST98B-AN Thermal Mass Flow Meter for Air and Nitrogen

Thermal Mass Flow Meter ST98B-CA

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Thermal Mass Flow Meter Summary

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

The ST98B-AN 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  
Aeration pond monitoring  


Flow Range: 1.25 to 125 sfps  [0.4 to 38 nmps] in
Air or Nitrogen 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 454 ºC]
Repeatability: 0.5% reading
Turndown Ratio
: Factory set at 100:1
Temperature Compensation: 30 F [ -1 C]
Temperature Range: 40 to 100 F  [4 to 38 C]
Pressure Range: 10 to 50 psia  [0.7 to 3.4 bar(a)]
Enclosure: Powder coated carbon steel rated for NEMA and CSA Type 4, water and dust tight
(meets IP66).
Agency Approvals:
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 inch male NPT stainless steel compression fitting with adjustable Teflon ferrule.
Insertion Length (Field Adjustable) 1:
1 to 6 inches [25 to 152 mm]
1 to 12 inches [25 to 305 mm]
Operating Temperature: Up to 200 F [93 C]
Operating Pressure: Up to 150 psig [10 bar(g)]

Flow Transmitter

Operating Temperature: 0 to 140 F  [-18 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 to 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 to 5 Vdc, 1 to 5 Vdc or 0 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 ft. [7.6 m] PVC cable for remote configuration.
Optional Communicator/Programmer: FCI Model FC88 Hand-held plug-in interface.

Note 1: After installation, stainless steel ferrule will be permanently fixed at the installed length.
Note 2: Output signal is isolated from input power on Vac powered units only.


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