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