ST50 Air/Compressed Air Flow Meter

Media Compatibility:

• Air

• Compressed Air

• Nitrogen

Agency Approvals:

Output Signals:

• Dual 4-20 mA Analog  (NAMUR NE43 compliant)

• Optional 0-500 Hz pulse for totalizer

Digital Display (Optional):

• LCD, ±9999 counts, user scalable to flow rate engineering units or 0-100%

• Pipe/Line Size Compatibility: 2" to 24" [51 mm to 610 mm]

Flow Rate: 0.75 SFPS to 400 SFPS [0,23 MPS to 122 MPS]

Accuracy: (at calibrated conditions) 

• Standard: ± 2% reading, ± 0.5% full scale 

• Optional:  ± 1% reading, ± 0.5% full scale

Temperature Coefficient: (at calibrated conditions) 
With optional extended temperature compensation; valid from 10% to 100% of full-scale calibration

• Flow: Maximum ± 0.025% of reading/ºF up to 250ºF [±0.05% of reading/ºC up to 121 ºC]

Repeatability: ± 0.5% reading

Temperature Compensation: 

• Standard: 40°F to 100°F [4°C to 38°C];

• Optional:  0°F to 250°F [-18°C to 121°C]

Turndown Ratio: up to 100:1

Flow Element

Installation: Insertion

Type: Thermal dispersion

Material of Construction: 316 stainless steel body with Hastelloy-C thermowell sensors, 316 stainless steel compression fitting with teflon or stainless steel ferrule. Optional: 316 stainless steel packing gland.

Pressure (Maximum Operating without Damage): 

• Stainless steel ferrule: 500 psig [34 bar(g)]

• Teflon ferrule: 150 psig [10 bar(g)]

• Packing gland: 500 psig [34 bar(g)]

Operating Temperature: 

• Stainless steel ferrule: 0°F to 250°F [-18°C to 121° C] 

• Teflon ferrule: 0° to 200° F [-18° to 93° C]

Process Connection: 1/2" MNPT or 3/4" MNPT with stainless steel or Teflon ferrule. Medium pressure packing gland, 1/2" or 3/4" MNPT with either graphite or Teflon packing material. Ball valves optionally available: order FCI part numbers 025172-09 (standard-duty, 1/2" ball valve), 025172-10 (standard-duty, 3/4" ball valve), 011144-05 (heavy-duty, 3/4" ball valve)

Insertion Length (Field Adjustable) 1:

• 1" to 6" [25 mm to 152 mm]

• 1" to 12" [25 mm to 305 mm]

• 1" to 18" [25 mm to 457 mm]

Flow Transmitter

Enclosure: NEMA4X (IP67)
Material
   Standard– Polyester powdered coated, ≤0.4% CU, low/no copper content*² aluminum
                  (*2: Standard effective April 2023)
   Optional-- Stainless steel

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

Input Power: 
DC:18 Vdc to 36 Vdc
AC: 85 Vac to 265 Vac (CE Marking approval from 100 Vac to 240 Vac)

Communication Port: RS-232C

Installation: Integral or remote (50' [15 m] max.)