Datasheet

D6F-D
MEMS 2-Axis Flow Sensor
Save energy with airflow sensing.
Optimize air conditioning control
without sacrificing quality.
• Two-axis sensing to detect not only the airflow speed but also the
airflow direction.
• Link up to 32 Sensors to achieve visualization over a wide range.
• Compact package for greater installation flexibility.
RoHS Compliant
Refer to the Safety Precautions on page 39 and Common
Precautions for the D6F Series on page 40.
Ordering Information
Applicable Medium
Air (See note.)
Flow Range
Model
±1.0m/s
D6F-D010A32-00
Note: Dry gas must not contain large particles, eg dust, oil, mist.
Characteristics/Performance
Characteristics
Item
Rating
Power-supply Voltage
4.5 to 5.5 VDC
Storage Temperature
-10 to 55°C (without freezing and condensation)
Operating Temperature
0 to 40°C
Storage Humidity
30 to 85%
Operating Humidity
30 to 80%
Note: With no condensation or icing.
Performance
Item
Flow Velocity
Flow Direction
Characteristic
Range
±1.0m/s in each axis
Accuracy
±3%F.S. in each axis
Range
0 to 360°
Accuracy
±15° (at 0.3m/s)
Note: 1. Flow velocity is determined by our standard wind tunnel (300 mm
square), and this does not indicate the flow velocity specified in
Measurement law. (Fig.1 shows our standard wind tunnel)
Fig. 1. Wind Tunnel
Fan
Laminar Element
Flow velocity
measurement point
Laminar element
2-Axis Flow Sensor
@300
200
300
300
300
200
(Unit: mm)
2500
35
D6F-D
MEMS 2-Axis Flow Sensor
Connection
Fig. 2. Block Diagram
Sensing
Element
Signal
Processing
MCU
RS485
Interface
RJ-45
Connector
1. VCC
2. GND
3. NC
4. TRD(−)
5. TRD(+)
6. NC
7. GND
8. VCC
X-Axis
Flow Sensor
Y-Axis
Flow Sensor
1. VCC
2. GND
3. NC
4. TRD(−)
5. TRD(+)
6. NC
7. GND
8. VCC
Pin
Symbol
1
VCC
Function
2
GND
3
NC
Non-Connection
4
TRD(-)
Serial Interface
5
TRD(+)
Serial Interface
6
NC
Non-Connection
7
GND
Ground
8
VCC
Power Supply Voltage
Power Supply Voltage
Ground
The sensor has two port of RJ-45 connectors (8 pins), and all the pair of each pin is connected internally.
These connectors can be used for daisy chain wiring when using multiple devices on the same bus (multi-drop connection).
The standard CAT5e straight LAN cable can be used for the electrical connection.
Interface
Item
Interface
Specifications
RS-485
Wire Connection
Multi-drop connection with daisy chain wiring (32 devices max.)
Communication system
2 wires : Half duplex
Baud rate
9600bps or 38400bps : DIP switch* selectable
Protocol
Modbus-RTU
Transmission code
Binary
Data length
8 bit
Stop bit
1 bit
Parity
None
Response time
250 ms max.
Command interval
10 ms min. (Minimum wait time after receiving the response from the device to the consecutive command transmission)
Slave address
1 to 32 (0x01 to 0x20) : DIP switch* selectable
Termination resistor
Built-in termination resistor : DIP switch* selectable
* The communication settings of this device can be set by DIP switch configuration as shown in Fig. 3.
All bits are switched off before shipment.
36
D6F-D
MEMS 2-Axis Flow Sensor
Fig. 3. DIP Switches
Circuits
8
1
ON
OFF
Function
ON
OFF
Enable
Disable
38400bps
9600bps
8
Built-in termination resistor
7
Baud rate
6
None
-
-
5
Slave Address : bit 4
1
0
4
Slave Address : bit 3
1
0
3
Slave Address : bit 2
1
0
2
Slave Address : bit 1
1
0
1
Slave Address : bit 0
1
0
Note: Slave address of the device = 1 + (5 bit of integer consisting of circuit
number 1 to 5).
Fig. 4. Connection Example to Link Three Sensors
Fig. 4 shows an example of multi-drop connection when connecting three devices on the same bus.
In this case, slave address, baud rate and built-in termination resistor of each device must be set properly.
SlaveAddress 0x01
Termination: Disable
SlaveAddress 0x02
Termination: Disable
SlaveAddress 0x03
Termination: Enable
Master
37
D6F-D
MEMS 2-Axis Flow Sensor
Dimensions (Unit: mm)
D6F-D010A32-00
Y axis (−)
60 dia.
X axis (+)
X axis (−)
Y axis (+)
LED Display
Green: Power Indicator
Yellow: Lit when communication
A
Description A
34.7
Power switch Knob position
LEFT: ON (default)
Right: OFF
Cross B-B
30
7
B
3 dia.
Depth1.5
3.6
3.2
*
2.5
6.3 dia.
7
22
3.2
8
B
38
* When using the fixing hole, Please do not exceed
the depth (3.6 mm) of the shaded portion.
D6F-D
MEMS 2-Axis Flow Sensor
Safety Precautions
• Places where the device receives strong electric field effect or
Caution
The sensor is a precision device, and if large shock and load is
applied, it may cause a failure or characteristic change. Please
do not use the sensor which is added excessive shock to the terminals, discompose the cover, or has fallen.
magnetic field effect.
● Noise Countermeasures
• Please check electrical noise condition before actual use. The
device may not perform as intended by the effect from electrical noise.
• The voltage input that exceeds absolute maximum ratings
Precautions for Correct Use
● Applicable medium and Device mounting
• Depending on the mounting position and the ambient environment, the foreign object such as dust can adhere to the inside
of the device and can cause clogging of the part of flow path.
As a result, the device may not perform as intended. And, the
characteristic specified in this document may not be maintained. Please use the device after enough ex-ante evaluation
under the condition of actual use in order to confirm the performance and safety in the application.
• For the gasses other than the applicable medium, please use
the device in your responsibility after the confirmation of its
performance and safety.
However, do not use in the presence of inflammable gases,
such as hydrogen, methane, ethane, and a liquefied petroleum
gas. In addition, do not use with corrosive gases (such as chlorine, sulfur, acid, alkali, ammonia etc.)
must not be applied. This can damage the electrical circuit of
the device. Place the protection circuit as needed, so that the
voltage to the lines will not exceed absolute maximum ratings.
• Take particular care to install away from AC power transformers, live mains power lines and high power magnetic circuits.
• The device may not operate properly where the place with the
equipment that generates strong high-frequency wave or
surge.
• Please attach surge absorber or noise filter to the peripheral
equipment that generates noise.
• In order to prevent inductive noise, wiring of the device must
be separated from the power line with the high voltage and
large current.
• When using with a switching regulator or DC-DC convertor,
switching noise may affect the device operation.
● Handling
• Please handle with countermeasure against static electricity.
• The direction of the arrow on top of the body shows the posi-
• Do not make a direct solder connection to the integral termi-
tive direction of the device output in each axis. Please install
nals; this may result in damage, and possibly cause failure. It
the device in a correct direction corresponding to the direction
is recommended to use the standard straight CAT5e LAN
of the flow. With the wrong installation, the device cannot measure flow direction correctly.
• After installation, the device may not perform as intended by
the presence of a flow obstacle around the device.
• After Installation, the device operation and its performance
should be checked before actual use in the application.
cable and to ensure correct connection.
• Do not mix up the wiring. This can damage the device and
cause the failure.
• Power must be supplied from the single source. And, do not
apply different voltage to the device from each connector. This
may damage the device and also the host equipment (master).
• Horizontal device orientation (top cover side up) is recom-
• After wiring cables, please do not apply excessive pulling force
mended. If the device orientation is not horizontal, the output
to the connector. Tensile force of 12N or more can cause the
may shift as an offset more than +/3%F.S.. For more details of
offset compensation features, please refer to the communication specification.
• The device may not operate properly, if a foreign object or a
flow obstacle is placed around the entrance of the flow path.
failure.
• Changing DIP switch setting must be done when in power off
state.
● Communication
• When using the multiple devices on the same bus, please
● Use environment
make sure that there is no device that has the same slave
Please do not use the device in the following environments:
address, please refer to the communication specification
• Places where the device directly receives radiant heat from an
apparatus.
• Places where the device is exposed to water, salt water, water
droplets and oil splash.
• Places where the device is exposed to direct sunlight.
• Places with volatile gas, inflammable gas or corrosive gas
(such as chlorine, sulfur, acid, alkali, ammonia etc.)
(No.MDPE-12-0146).
• When using built-in termination resistor, please enable it only
to one device at the end of the bus.
• Please make sure that there are no multiple devices with termination resistors enabled.
• Please make sure that baud rate setting must be same for the
host equipment (master) on the same bus.
• Places where frequent temperature changes.
• Places where dusty condition.
• Places with the possibility of freezing and dew condensation.
• Places where the device receives large magnitudes of vibration and shock.
39
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