SFM3000 datasheet(5/7 Pages) ETC2

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Version 2 – February 2014

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3.4

Mechanical fitting

Fittings of the SFM3000 sensor correspond to the

international standard ISO5356-1:2004. Details about this

type of connection can be found in the description of the

standard. To minimize the risk of connectors being

accidentally disconnected, latching connectors can be

suggested.

It is also possible to insert O-rings in the grooves and

attach tubes with an inner diameter of 23 mm to the

SFM3000.

Cross section of recommended O-ring

4. Instructions for Use

4.1

Calibration orientation

The sensors are calibrated horizontally as depicted in the

following graph:

4.2

Inlet flow conditions

In order to provide good flow conditions, the inner

diameter of the connecting tube has to be approximately

the same as the inner diameter of the SFM3000 main flow

channel. The inlet tube has to be straight and at least 10

cm in length. The SFM3000 is equipped with meshes on

the in- and outlets of the flow channel to reduce

turbulences and thus improve the stability.

Please refer to the application note “Inlet conditions for the

SFM3000 Mass flow meters” for more information.

4.3

Temperature compensation

The SFM3000 sensor features digital temperature

compensation. The temperature is measured on the

CMOSens® chip by an on-chip temperature sensor. This

data is fed to a compensation circuit that is also integrated

on the CMOSens® sensor chip. Thus, no external

temperature compensation is necessary.

4.4

Sensor handling

The SFM3000 sensor is designed to be robust and shock

resistant. Nevertheless, the accuracy of the high-precision

SFM3000 can be degraded by rough handling. Sensirion

does not guarantee proper operation in case of improper

handling. Note: avoid applying any mechanical stress to

the solder joints of the sensor during or as a result of PCB

assembly.

4.5

ESD

The electronics of the SFM3000 sensor consist of a single

automotive qualified chip. It complies with the following

ESD norms:

AEC Q 100 002 (4kV HBM)

AEC Q 100 003 (200V MM)

Although the sensor complies with these norms, it does

not mean the sensor is immune against ESD.

The sensor is shipped in an antistatic tray to prevent

electrostatic discharge. To avoid damage to the sensor,

ground yourself using a grounding strap or by touching a

grounded object before touching the sensor. Furthermore,

store the parts in an antistatic package when not in use.

4.6

I2C Interface and communication

Due to I2C interface restrictions, the cable length from the

sensor to the microprocessor is recommended to be as

short as possible and certainly not above 30 cm. For wires

longer than 10 cm it is mandatory to shield the SDA and

SCL.

In case data is read from the sensor, the first data byte of

the transaction must always be acknowledged by the

master.

It must be possible to reset the sensor through a hard

reset, i.e. powering off and on the sensor, in case the

sensor freezes.

I2C Communication details are given in the application

note “I2C Functional Description for SFM3000”.

d1 = 19mm

d2 = 2mm

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