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Digital Flowmeters
A all-in-one instrument to read flow, temperature and pressure. Fast and accurate with very low pressure drop. NIST traceable calibration certificate provided. Portable, with NiCad rechargeable batteries. (See notes on botom)
Model 4100
Model 4043
Model 4000
0.01-20 LPM 0-200 LPM 2.5-300 LPM
+/- 2% of reading or 0.005 LPM whichever is greater. +/- 2% of reading or 0.05 LPM whichever is greater. +/- 2% of reading or 0.05 LPM whichever is greater.
4ms to 63% of full flow 4ms to 63% of full flow 4ms to 63% of full flow
5"x2.9"x3.8" 7.2"x2.5"x2.1" 7.2"x4.5"x5"

• +/-2% of reading for high accurcy

• Built in temperature and pressure compensation

• Readings in volumetric liters per minute or standard liters per minute. (corrected for pressure and temperature known as mass flow) LPM

• Convenient analog of flow rate

• Digital output of flow rate

• Standard LPM are defined as 21.1C (70 F) and 101.3 kPa (14.7 psia).

PC Interface Connection with RS232
Select either volumetric or standard flow measurement for display
configure the device with various options:

• Set sampling rates for analog and digital outputs

• Set update rate for LCD display

• Compute volume

Calibrator kit includes calibrator, single pack NiCad battery, standard 120 VAC battery charger, connector hose, 2 connectors and operating manual.
APB-806000 Digital Flowmeter Model 4000, 2.5-300 STD LPM
APB-806100 Digital Flowmeter Model 4043, 0-200 STD LPM
APB-806200 Digital Flowmeter Model 4100, .001-20 STD LPM
TSI's Digital Flow Meter vs NIOSH (its up to you)

The TSI flow meter is a hot-wire mass flow device that works quite well, but such devices do not meet the NIOSH definition of a primary device as TSI claims in their web site. NIOSH states in The Industrial Environment, Its Evaluation and Control (CDC, NIOSH, 1973) on page 104, "Primary measurements generally involve a direct measurement of volume on the basis of the physical dimensions of a closed space." They are describing devices like bubble meters and spirometers that use a measured volume that is dimensionally verifiable. The TSI device clearly does not meet that description, and would be a secondary device as described later in the same text.

I asked the TSI technical group about this and was referred to some text in the NIOSH Manual of Analytical Methods in Part 7 of Chapter D on page 27. It statesŠ

"The choice of a reference instrument will depend on where the calibration is to be performed. For laboratory use, primary standards, such as a spirometer or a bubble meter are recommended. Several electronic soap bubble calibrators and one dry-cell calibrator are commercially available as primary calibrators. Other instruments, such as a wet-test, mass-flow, or a dry-gas meter, may be used."

They are interpreting the last sentence to say that those devices are primary. The statement clearly lists bubble meters and spirometers as primary in the second sentence. The third sentence adds electronic bubble meters and the (piston) dry-cell as primary. The last sentence includes mass-flow meters as "other instruments" that are acceptable, but clearly does not call them primary. The TSI claim is taking a very liberal interpretation of that paragraph in my opinion, and it ignores the definition in the other NIOSH text book referenced above.


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