The 400 Series is a new family of flow instruments which is specifically designed to meet the needs of the industrial gas flow market. Each instrument in the series can be driven by a +24 VDC power supply. In addition, the “I” family in the 400 Series features an IP-65 enclosure which will allow the use of the instrument in a wide variety of environments.

Mass flow techniques provide more RELIABLE, REPEATABLE AND ACCURATE gas flow rate measurements compared to volumetric methods such as rotometers and turbine meters. Mass flow measurements use the density of the gas to translate mass flow units (kg or lbs) to units of familiar volumetric terms (liters/min). However the measurements are still mass units (we call those units STANDARD liter/min (slm)) and they do not change with temperature and pressure changes. We do this by referencing just one, specific temperature and one specific pressure (STP).

Features +/- (0.5% of reading + 0.2% of Full Scale) for 0 - 2,500 slm Remote Electronics Available - 0 - 10 to 0 - 350-HFM-I-401 Flow 0 - 100 - 0 - 2500slm-HFM-I-405 Ranges IP65 Weatherproof Package NIST Tracable Calibration Built in Totalizer Analog and Digital Output Accessories For Meters And Controllers PowerPod Models 100, & 400 24 Volt Power Supply RS 232 Cable USB-RS 232 Cable Industrial Ethernet Cable Ethernet RJ45 _ M12 Converter Flow Service Plan

Applications • Industrial Gas Distribution • Fuel Cell Testing • Pharmaceutical Production • Secondary Calibration Reference • Gas Generations

Go To Volume (Flow Rate) Conversions

400-I Series Mass Flow MeterSpecification (Based on Nitrogen)
Standard Temperature and Pressure - 0° C and 760 Torr

Specification	Mass Flow Meter HFM-I-401	Mass Flow Meter HFM-I-405
Product Bulletins	Download a pdf	Download a pdf
Manuals	HFM-I-401	HFM-I-405
Drawings	HFM-I-401	HFM-I-405
Full Scale Flow Range	0-10slm to 0-350slm	0-100 slm to 0-2500 slm
Accuracy	+/- (0.5% of reading + 0.2% of Full Scale) +/- 1%	+/- (0.5% of reading + 0.2% of Full Scale) +/- 1%
Repeatability	+/-0.1% of Full Scale	+/-0.1% of Full Scale
Standard Pressure Rating	500 psig	500 psig
Pressure Coefficient of Span	+0.01%/psi of reading (0-1000 psig N2)	+0.01% of reading/psi (0-1000 psig N2)
Pressure Drop	1.1 psi at full scale flow	5.1 psi at full scale flow
High-Pressure Option	1500 psig	1000 psig
Warm Up Time	30 minutes 2 min for +/- 2% of full scale	30 minutes 2 min for +/- 2% of full scale
Operating Temperature	-20 - 70oC	-20 - 70oC
Temperature Coefficient of Meter	Zero <0.05%/o C of Full Scale Span <0.16%/ o C of Reading	Zero <0.05%/o C of Full Scale Span <0.16%/ o C of Reading
Leak Integrity	< 1 x 10-9 sccs He	1 x 10-9 sccs He
Power - Meter	18 - 38 VDC 3.5 watts (Ethernet) 2.5 watts (RS 232/485)	18 - 38 VDC 3.5 watts (Ethernet) 2.5 watts (RS 232/485)
Flow Signal	0-5.00 VDC, 0-10 VDC 0-20 mAmp, 4-20 mAmp	0-5.00 VDC, 0-10 VDC 0-20 mAmp, 4-20 mAmp
Attitude Sensitvity of Zero	< 2% of Full Scale	< 2% of Full Scale
Settling Time of Meter	</= 2 sec (0% to 100% FS)	</=0.5 sec (0% to 100% FS)
Wetted Material - Meter	302 SS, 316 LSS, Ni 200 Viton®	302 SS, 316 LSS, Ni 200 Viton®
Analog Connector	Internal Terminal Block	Internal Terminal Block Circular Connector
Digital Communication	RS 232 (STD) RS 485 and Ethernet	RS 232 (STD) RS 485
Pin out diagrams	H - Pin out	H - Pin out
Fittings	1/2" Swagelok®	1" Swagelok®
Weight (approx)	12 lbs	18 lbs

*Accuracy is for Nitrogen. See manuals for Gas Conversion Factors