NAL​L Series Low Pressure Drop & High Temperature Thermal Mass Flow Meter

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​​​Notice: NALL Series products will no longer be available starting January 1, 2023.

The NALL Series of thermal mass flow meters from Teledyne are among the most trusted flow instruments. For over fifty (50) years, NALLs have provided reliable measurements in a broad variety of applications. However, many of the electronic components have become increasingly difficult to source and we have made the decision to no longer build new NALL Series after 2022. Please note that this decision does not affect our commitment to providing quality mass flow meters and controllers such as our analog 200 and 300 Series and our newer Digital 300 (300 Vue) line of mass flow instruments. We will continue to offer calibration services for the NALL, but repairs will end after this calendar year. We do not take this decision lightly and we are prepared to review your application and work with you to offer alternative flow solutions. 


​P​roduct Bulletins

Product Man​uals

​Software / Firmware

 Related Products

​​​Part Number ​Description
OPT-E 230 vAC Operation
OPT-P Pressure Test to 1500 PSIG
OPT-T 200oC Operation
OPT-H Hermetic Seal
NALL Digital Readout, Box Style Power Supply, 0 - 4 VDC, 115 vAC
​NALL-P / CC Digital Panel Mount Power Supply, 4 - 20 mA output, 115 vAC
NALL-P Digital Readout Panel Mount Power Supply, 0 - 5 VDC, 115 vAC
​NF-Length-NMNALL Series Cables
(8' and Custom Lengths)

​NFT-Length-NM​NALL Series Cables, Hi Temp
(8' and Custom Lengths)


The Original Hastings  Flow Meter, Low Pressure Drop!

The NALL Flow  Meter is the meter that started a legacy .  Operating on a unique thermal principle,  the NALL  Series is the choice  for high temperatures and adverse environmental applications. Inherently linear, the flexible NALL separates the transducer from  the electronics and can meter a wide range of flow.

The NALL series meters  have flow ranges from 0-10 sccm to flows of 0-15,000 slm; provide analog outputs, ultra-low pressure drops, all metal (standard), can be hermetically sealed and operate up to 200℃.  The full scale range  is  specified by the end user.  A NIST traceable calibration certificate is standard.   Available in Monel for use with corrosive gases.

±1% of full scale Accuracy

Buy from the designers, Teledyne Hastings, and experience extraordinary customer service. Let us solve your application challenges, by designing and building your custom flow instruments.

​​​​Applications and Industries

  • Energy / Power Generation
  • High Temperature Process Flows
  • R&D Flow


NALL Series Meter
(User Selectable)
0 - 10 sccm to 0 - 15,000 slm (N2)
Accuracy + 1.0% of full scale
​Repeatability + 0.25% of full scale
Maximum Working Pressure 500 PSIG (Optional 1000 PSIG)
Analog I/O (Standard) ​0 - 5 VDC
Analog I/O (Optional) 4 - 20 mA
Power Requirements
115 volt AC, 50/60 Hz - 15 watt or 230 volt AC
Wetted Materials ​316SS, or Monel, Gold/Nickel Braze