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Product Features
  • 4 millisecond flow response
  • High accuracy ±2% of reading
  • High turndown ratio
Delivery options

At Cadmus Products we aim to deliver orders efficiently and at highly competitive rates. 

  • We can ship consignments of all shapes and sizes and hazardous content across the UK and worldwide. Most of our orders are sent via DHL, however sometimes we may use other couriers.
  • If you are purchasing a laboratory product online you can find out the price of shipping checkout. If you are obtaining a quote for a product, then we will email you
    with our best shipping prices along with your quote.
  • Please see our delivery page for full information

TSI Mass Flowmeters 4000 Series


TSI Mass Flowmeters 4000 series incorporate a proprietary platinum film sensor design for measuring gas flows in applications demanding fast response and high accuracy over a wide flow range.

TSI flowmeters have turn-down ratios greater than 1000:1 due to our thermal flow sensing technology and extensive gas calibration process.

The TSI 4000 Series was designed for ultra-low pressure loss to minimize any undesirable effects the flowmeter can have on the readings when installed in-circuit.


  • Low pressure drop
  • Convenient analog output of flow rate
  • Versatile digital output of flow rate, volume, pressure, temperature
  • Built-in temperature and pressure compensation
  • NIST-traceable calibration certificate included at no additional cost

RS232 Interface For Digital Outputs and Configurable Device Options

  • Set analog output zero and scaling
  • Specify start/stop trigger levels for volume measurement
  • Set update rate for LCD display
  • Set sampling rate for analog and digital outputs
  • Select gas calibration
  • Select either standard or volumetric flow measurement
  • Set display units for Model 4140/4143 to L/min or cm3/min
  • Compute volume


  • Product Development
  • Manufacturing
  • Research
  • Field Service
  • Quality Assurance
  • 4040 Flowmeter, 300 L/min, Air, O2, N2, 22mm
  • 4043 Flowmeter, 200 L/min, Air, O2, N2, 1/2 inch
  • 4045 Flowmeter, 300 L/min, Air, O2, N2 3/4 inch
  • 4140 Flowmeter, 20 L/min, Air, O2, N2, 1/4 inch
  • 4143 Flowmeter, 20 L/min, Air, O2, N2, 3/8 inch
  • 41403 Flowmeter, 20 L/min, N2O,Air,O2,N2 1/4 inch
  • 41433 Flowmeter, 20L/min, N2O,Air,O2,N2 3/8 inch
Accessories and Replacement Parts
  • 4199 Flowmeter Battery Pack
  • 1040078 Software, Flowmeter Setup Package
  • 1303583 Computer Cable, 8Pin Mini Din to 9Pin D-Sub
  • 1303584 Analog Cable, 8 Pin Mini DIN to Stripped Leads
  • 1319176 Hard Sided Carrying Case 4000 Series
  • 1319201 Hard Sided Carrying Case 4100 Series
  • 1602292 High Flow Filter 22mm ISO Taper, HEPA Grade (use with Model 4040, 4021x)
  • 1602300 High Flow Filter, 3/8" FNPT, HEPA Grade (use with Model 4043, 4045)
  • 1602317 Low Flow Filter, 1/4" Tube, HEPA Grade (use with Model 4140x)
  • 1602342 Low Flow Filter (use with Certifier FA+ and Model 4143x)
  • 1980339 Owner's Manual, 4040/4043/4045
  • 1980340 Command Set Manual 4000/4100 Series
  • 1980383 Owner's Manual 4140/4143/41403/41433
  • 8918-AT AC Adapter, 100-240 V, Australia Line Cord
  • 8918-EC AC Adapter, 100-240 V, ContinentalEurope Line Cord CEE 7/16, grounded
  • 8918-GB AC Adapter, 100-240 V, UK Line Cord, grounded, fused
  • 8918-NA AC Adapter, 100-240V, U.S. Line Cord NEMA 5-15 plug, grounded
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