Bypass Set-up

When used in a bypass set-up, as illustrated below, the D6F-P

mass flow sensors can measure flow rates far beyond the 1

LPM in-line rating. The pressure differential required to pull

airflow through the sensor can be accomplished by installing a

flow restrictor between the two ports or through the use of a

flow cross in large ducts, as shown in the HVAC application.

HVAC Application

The D6F-P mass flow sensor is ideal for

damper control in variable air volume

systems, where low flow rates are

difficult to measure with differential

pressure sensors.

Precautions

1. Avoid use in excessively dirty, wet environments

2. Do not use in the presence of flammable gases (e.g.

hydrogen, methane, ethane) and liquefied petroleum gas. In

addition, do not use with corrosive gases (e.g. chlorine, sulfur,

acids, alkalis, etc.).

3. Install so that gas flows from “+” to “-” stamped ports.

4. For best results (optimum accuracy), mount horizontally.

5. Use 2 suitable M2.6 screws for mounting. Do not exceed a

fixing torque of 0.59 Nm.

6. Do not modify D6F- in any way.

7. Do not place any object in or close to the inlet and outlet

orifices.

8. Do not use the sensor in any of the following environments:

• a location that receives significant radiant heat

• a place where intense light may radiate down

• where fast changing temperatures occur

• locations prone to freezing, high humidity, condensation

• where large magnitudes of vibration or shock could occur

9. Noise countermeasures: VERY IMPORTANT: Take suitable

precautions to minimize the effects and potential for induced

electrical noise. Install away from apparatus that generates strong

high frequencies, surges and spikes. Take particular care to

install away from AC power transformers, live mains power lines

and high power magnetic circuits. Attach a surge suppressor and

a noise filter to the peripheral equipment.

10.Ensure good grounding is achieved by grounding the GND

terminal to the peripheral equipment’s main ground frame

connection and its associated regulated power supply.

11.Do not make a direct solder connection to the integral

terminals on the connector model type. The use of optional cable

‘D6F-CABLE2’ is recommended for attachment to ensure correct

connection (D6F-P0010A2). Solder PCB terminals after securing

the sensor to the board (D6F-P0010A1).

12.D6F- is a precision component. Keep in original packaging

and remove only when ready for installation. Damage may occur

if subjected to excessive force (e.g. dropped or kicked). Any item

suspected to be damaged should be discarded.

13.Immediately following installation, a qualified person should

perform checks to ensure safe, satisfactory operation.

4

MEMS Mass Flow Sensor

D6F-P