ASF1400 datasheet(2/9 Pages) ETC2

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ASF1400 Bidirectional Mass Flow Meter

Introductory Description

The heart of the ASF1400 mass flow meter is

sensor technology. The ASF1400 mass flow meter

therefore provides unbeatable performance at very

attractive system cost. The lowest detectable gas flow

rate is 0.003 sccm, which means a minimum volume

of 3 mm3 gas per minute can be measured. Covering

at the same time a flow range of more than 4 orders

of magnitude, the ASF1400 sets a new standard

wherever mass flow has to be measured or

controlled.

The ASF1400 device measures true mass flow

independent of the ambient temperature and pressure

changes. You simply connect the gas to be measured

to the ASF1400 device to get an instantaneous gas

flow rate at a sampling rate of up to 7Hz (please

A flow range between ±400 sccm can directly be

mea-sured by connecting the ASF1400. To increase

the range, a bypass can be used in conjunction with

the ASF1400 device (see Section 1.4 of this data

sheet).

In addition to mass flow, the ASF1400 device

provides information about the temperature on the

CMOSens® sensor element. Both mass flow and

temperature data are accessed through an RS-232.

The RS-232 interface allows you to directly connect

the ASF1400 device to a PC or PDA using standard

terminal software. If a special interface such as 4-20

mA current output or other is required contact

Sensirion for a customer specific solution.

In general, all gas types can be measured using the

ASF1400 product. However, the standard calibration

gas is nitrogen. Please contact SENSIRION, if you

would like to use the sensor for applications with other

gases.

To get you started quickly, an evaluation package

including ASF1400 devices, software, cables, rubber

hose and bypass is available from Sensirion AG.

CMOSens® sensor technology

CMOSens® is the base technology for all Sensirion

multi sensor modules and sensor systems. The

unification of semiconductor chip and sensor

technology serves as a platform for highly integrated

system solutions with excellent sensor precision and

reliability. With CMOSens®, the on-chip sensor

element forms an integrated whole with a high-end

amplification and A/D converter circuit. Due to the

compact single-chip design, CMOSens® based

sensors are very resistant to electromagnetic

disturbances (EMC), another important technical

advantage of this state of the art sensor technology.

As a result, CMOSens® based multi sensor modules

offer excellent sensor precision, fast response time

and a very large dynamic measurement range. In

addition, the digital intelligence of the CMOSens®

sensor technology enables digital interfaces that

permit an easy link with the system of the customer, a

real advantage and benefit that results in ready-to-use

problem solutions (“Mount&Sense”).

www.sensirion.com

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