NI WSN-3214 User Manual And Specifications

Ni wireless sensor network 4-channel, quarter/half/full bridge input node

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USER GUIDE AND SPECIFICATIONS

NI WSN-3214

NI Wireless Sensor Network 4-Channel, Quarter/Half/Full Bridge Input Node

This user guide describes how to use the NI WSN-3214 input node and lists its specifications. The

NI WSN-3214 is a four-channel, low-power, wireless quarter-bridge, half-bridge, and full-bridge device

that works with other NI WSN-32xx nodes and gateways to form a wireless sensor network. Figure 1

shows the NI WSN system components.

NI WSN-32xx Nodes

NI 9792 WSN Real-Time Gateway

NI WSN-9791 Ethernet Gateway

Figure 1. NI WSN System Components

NI CompactRIO Chassis

NI 9795 WSN C Series Gateway

PC Running NI Software

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Page 1 NI WSN-3214 NI Wireless Sensor Network 4-Channel, Quarter/Half/Full Bridge Input Node This user guide describes how to use the NI WSN-3214 input node and lists its specifications. The NI WSN-3214 is a four-channel, low-power, wireless quarter-bridge, half-bridge, and full-bridge device that works with other NI WSN-32xx nodes and gateways to form a wireless sensor network.
Page 2: Safety Guidelines
36 NI WSN nodes per gateway, and multiple PCs. When you connect the NI WSN gateway, you can use a separate host PC running Windows, or a NI CompactRIO chassis running NI LabVIEW Real-Time, to display measurement results, status information, and to change the NI WSN gateway and NI WSN-3214 device settings.
Page 3: Safety Guidelines For Hazardous Locations
Safety Guidelines for Hazardous Locations The NI WSN-3214 is suitable for use in Class I, Division 2, Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2, AEx nC IIC T4 and Ex nL IIC T4 hazardous locations; and nonhazardous locations only.
Page 4: Related Documentation
NI WSN system, refer to and enter ni.com/info rdwsnrd In addition to this guide, the following documents may be useful when configuring your NI WSN system: • The getting started guide for your NI WSN gateway(s) •...
Page 5: Software Overview
To set up and use NI LabVIEW with the NI WSN-3214 device, you need the following: • NI WSN gateway • NI WSN-3214 device(s) with a 5–30 V power supply or four alkaline or lithium AA 1.5 V batteries for each node. Refer to the Battery Power section for recommended battery types.
Page 6: Attaching The Ni Wsn-3282 Din Rail (Optional)
Figure 3. Attach the Antenna to the Device Mounting the NI WSN-3214 Device You can mount the NI WSN-3214 on a panel or on a 35 mm DIN rail. For kit accessory ordering information, refer to the NI WSN product page accessory section at .
Page 7 DIN Rail Clip (Without Device) DIN Rail Figure 5. DIN Rail Clip Installation Press down firmly on the NI WSN-3214 to compress the spring until the clip locks into place on the DIN rail. © National Instruments NI WSN-3214 User Guide and Specifications...
Page 8: Using A Panel Mount Accessory
I/O wires. You can use the NI WSN-3280 panel mount accessory to attach the NI WSN-3214 device to a panel or other flat surface. The NI WSN-3281 panel mount accessory also includes a magnetic mount for attaching the NI WSN-3214 device to metallic surfaces.
Page 9 Mounting Hole Figure 7. Panel Mount Accessory Refer to Figure 7 while completing the following steps to mount the NI WSN-3214 on a panel: (NI WSN-3280) Bolt or screw the panel mount accessory to a panel using five 8-32 or M4 screws.
Page 10: Using The Integrated Panel Mount Slots
Figure 8. Slide Retention Clip Down and Tighten Panel Mount Knob Using the Integrated Panel Mount Slots You can also mount the NI WSN-3214 to a panel using the integrated panel mount slots, as shown in Figure 9. Attach three number 8 or M4 pan head screws in the mounting panel, leaving 0.1 in. space under the head of each screw.
Page 11: Installing The Software
After installation of NI-WSN, the NI Wireless Sensor Network Getting Started Guide is available from Start»All Programs»National Instruments»NI-WSN. Powering the NI WSN-3214 Device The NI WSN-3214 device can be powered by either an external power supply or four AA alkaline or lithium batteries. Refer to the Specifications section for details about the input power and battery requirements.
Page 12: Installing Batteries
If both battery and external power are connected, the NI WSN-3214 functions from the external power input. The device is designed to provide battery backup in the event of loss of external power and automatically switches to battery power when external power is lost.
Page 13 Reinstall the 2-position mini-combicon plug in the device and tighten the retaining screws. Caution You must use a UL Listed ITE power supply marked LPS with the NI WSN-3214. The power supply must also meet any safety and compliance requirements for the country of use.
Page 14: Device Interface
Device Interface Figure 12 shows the NI WSN-3214 device interface. Antenna I/O Connector WSN Connect Button Reset Button Signal Strength/Status LEDs Pro2 Port (Reserved for Future Use) User LED 5–30 V External Power Input Battery Slots/Polarity Indicators Figure 12. NI WSN-3214 Node Interface NI WSN-3214 User Guide and Specifications ni.com...
Page 15: Signal Strength/Status Led Indicators
Signal Strength/Status LED Indicators The NI WSN-3214 has four signal strength/status LED indicators, which flash twice before displaying signal strength information. Table 1 shows the status and signal strength LED patterns. Table 1. Signal Strength and Status LED State/Node Status...
Page 16: Reset Button
Refer to your NI WSN gateway documentation for detailed instructions about how to connect a NI WSN-3214 to the NI WSN gateway. The NI WSN-3214 is equipped with a WSN connect button, as shown in Figure 12. The button controls network connection and the LEDs, which display connection status.
Page 17 R —Half-bridge completion resistors located inside the NI WSN-3214. • —Quarter-bridge completion resistor located inside the NI WSN-3214. You can select to use a bridge completion of 350 Ω or 1 kΩ. • must be equal to the nominal resistance of the active gage (R •...
Page 18 The ratio of the bridge output voltage to the excitation voltage is calculated internally on the NI WSN-3214. Shunt Calibration is only supported for quarter-bridge. If you are switching from using a quarter-bridge to a half-bridge or full-bridge configuration, you need to specify 1 for Shunt Calibration, and then perform Offset Null in the software.
Page 19 The ratio of the bridge output voltage to the excitation voltage is calculated internally on the NI WSN-3214. Shunt Calibration is only supported for quarter-bridge. If you are switching from using a quarter-bridge to a half-bridge or full-bridge configuration, you need to specify 1 for Shunt Calibration, and then perform Offset Null in the software.
Page 20 (top) while the other is mounted in the direction of bending strain on the opposite side (bottom). • Half-bridge completion resistors (R and R ) are provided by the NI WSN-3214. • Sensitive to bending strain. • Rejects axial strain.
Page 21 The ratio of the bridge output voltage to the excitation voltage is calculated internally on the NI WSN-3214. Shunt Calibration is only supported for quarter-bridge. If you are switching from using a quarter-bridge to a half-bridge or full-bridge configuration, you need to specify 1 for Shunt Calibration, and then perform Offset Null in the software.
Page 22 The ratio of the bridge output voltage to the excitation voltage is calculated internally on the NI WSN-3214. Shunt Calibration is only supported for quarter-bridge. If you are switching from using a quarter-bridge to a half-bridge or full-bridge configuration, you need to specify 1 for Shunt Calibration, and then perform Offset Null in the software.
Page 23 Sensitivity ~ 1.0 μV/V per με, for GF = 2.0, ν = 0. • – ε ε –ν AI– – ε ε ν – /EX– COMP RS– NI WSN-3214 Figure 22. Full-Bridge Type II Circuit Diagram © National Instruments NI WSN-3214 User Guide and Specifications...
Page 24 The ratio of the bridge output voltage to the excitation voltage is calculated internally on the NI WSN-3214. Shunt Calibration is only supported for quarter-bridge. If you are switching from using a quarter-bridge to a half-bridge or full-bridge configuration, you need to specify 1 for Shunt Calibration, and then perform Offset Null in the software.
Page 25 Poisson’s ratio is a material property of the specimen you are measuring. • —Measured voltage of the bridge. • —Excitation voltage provided by the NI WSN-3214. • —Offset compensated ratiometric bridge output defined by the following equation: V CH ...
Page 26 Analog Input Circuitry Excitation Voltage The NI WSN-3214 uses a fixed 2 V excitation to supply the bridges. This is generated internally from the external power supply or batteries. Bridge excitation current is limited to 6.4 mA per channel. The...
Page 27 5.7mA Shunt Calibration Remote sensing corrects for resistances from the EX pins on the NI WSN-3214 to the sensor, and shunt calibration corrects for these errors and for errors caused by wire resistance within an arm of the bridge. Shunt calibration is most useful with quarter-bridge sensors because there may be significant resistance in the wiring to the active resistor in the bridge.
Page 28: Noise Considerations
One common scenario is to observe the 50 Hz or 60 Hz noise in the spectrum of your measurement. This can be caused by a nearby device that is supplied from the mains. The WSN-3214 is capable of filtering the 50 Hz and 60 Hz in this situation by selecting the filter acquisition modes in NI-WSN or in NI LabVIEW WSN.
Page 29: Controlling Digital Inputs And Outputs
DGND pin on the NI WSN-3214. Or, connect the DGND pin on the NI WSN-3214 to Earth GND.
Page 30 The NI WSN-3214 device has two bi-directional digital I/O channels. Each channel supports eight operational modes depending on whether the channel is configured as digital output or digital input. The NI-WSN software controls the different modes of operation by turning on and off the high side and low side switches.
Page 31 You can connect only one external DIO PWR supply to the NI WSN-3214. The power supply provides the current for the devices you connect to the NI WSN-3214. Connect the power supply positive lead to DIO PWR terminal and the power supply negative lead to one of the DGND terminals.
Page 32 DGND NI WSN-3214 Figure 31. Connecting a Device to the NI WSN-3214 in Drive Low (Sinking) Mode 3V TTL Logic (Open-Collector with Pull-Up) The 3V TTL Logic (Open-Collector with Pull-Up) mode can be used to connect to 3 V and 5 V logic inputs with TTL Logic compatible thresholds.
Page 33 NI WSN-3214 Figure 33. Connecting a Device to the NI WSN-3214 in Drive High and Low Mode Connecting Digital Inputs You can connect a variety of sensors, switches, and industrial devices to the NI WSN-3214 device. Refer to the Specifications section to ensure compatibility.
Page 34: Battery Considerations
At each waveform interval the NI WSN-3214 transmits the acquired data to the gateway. The size of the acquired data varies along with the number of channels being measured and with the number of samples per waveform.
Page 35 3 Channels 4 Channels Waveform Interval (Seconds) Test Conditions: NI-WSN, 1 Sample per Waveform, 50/60 Hz High Rejection, 350 Ω Full-Bridge Figure 35. NI-WSN Battery Life Versus Waveform Interval and Number of Channels © National Instruments NI WSN-3214 User Guide and Specifications...
Page 36 Figure 37. NI-WSN Battery Life Versus Number of Samples per Waveform NI LabVIEW WSN If you are using NI LabVIEW WSN, the expected battery life of your NI WSN-3214 can vary greatly based on your NI LabVIEW WSN program, waveform interval, waveform sample rate, number of samples per waveform, acquisition mode or bridge type.
Page 37 4 Channels, 100 Samples Time Interval (Seconds) Test Conditions: NI LabVIEW WSN Module, up to 10 User-defined Variables Sent per Radio Interval, 50/60 Hz High Rejection Figure 39. NI LabVIEW WSN Battery Life Versus Time Intervals, Number of Channels, and Number of Samples per Waveform with No Waveform Sent Over the Radio ©...
Page 38 50 Waveforms Time Interval (Seconds) Test Conditions: NI LabVIEW WSN Module, 10 Samples per Waveform, 50/60 Hz High Rejection, 4 Channels, 350 Ω Full-Bridge Figure 40. NI LabVIEW WSN Battery Life Versus Time Interval and Number of Waveforms Acquired for Each Waveform Sent Over Radio 350Ω...
Page 39 4CH 50/60Hz High Rejection Time Interval (Seconds) Test Conditions: NI LabVIEW WSN Module, 10 Samples per Waveform, 4 Channels, 350 Ω Full-Bridge, 10 Waveforms Acquired, 1 Waveform Sent Over Radio for a Sampling Interval Figure 42. NI LabVIEW WSN Battery Life Versus Time Interval and Acquisition Mode for Multiple Waveform Acquisitions ©...
Page 40 36 DIO PWR Figure 43. NI WSN-3214 Pinout TEDS Channels The TEDS channels on the NI WSN-3214 are reserved for future use by National Instruments. Specifications These specifications are typical from –40 to 70 °C, and assume high rejection strength mode and 50/60 Hz filter rejection mode unless otherwise noted.
Page 41: Analog Input Characteristics
C and the expected temperature variation is 20 °C, then the typical offset error for the measurement is as follows: × × 20°C ------ - ------ ------ - offset error (0.06% of range) °C © National Instruments NI WSN-3214 User Guide and Specifications...
Page 42 2.8 ms Aperture time 0.14 5.5 ms Aperture time 10.8 ms Aperture time 0.07 21.5 ms Filter: 50 Hz 0.09 Low Power Filter: 60 Hz Low Power Filter: 50 Hz 0.08 High Rejection NI WSN-3214 User Guide and Specifications ni.com...
Page 43 Power-on output state..........High impedance DIO pin capacitance..........2,000 pF Digital Input Modes (configurable per channel) ......24 V Sinking, 24 V Sinking with Power Management, Logic, Contact Closure Input voltage range ..........3.3 to 24 VDC maximum © National Instruments NI WSN-3214 User Guide and Specifications...
Page 44 3V TTL Logic mode pull-up ......>2 V with I DO protection Voltage ............+30 VDC maximum Reversed voltage ..........None Short circuit (sourcing) Trip current ..........0.26 A minimum, 1.2 A maximum Trip time..........<250 μs, at 1.2 A Overcurrent (sinking)........6.5 A maximum NI WSN-3214 User Guide and Specifications ni.com...
Page 45: Wireless Characteristics
Internal battery ............4 AA 1.5 V alkaline or lithium batteries Only use the following batteries ......Energizer E91 AA, alkaline Duracell MN1500 AA, alkaline Energizer L91 AA, lithium Due to regulations, the frequency bands depend upon country of operation. © National Instruments NI WSN-3214 User Guide and Specifications...
Page 46: Physical Characteristics
External Power Caution You must use a UL Listed ITE power supply marked LPS with the NI WSN-3214. The power supply must also meet any safety and compliance requirements for the country of use. Voltage range ............5 to 30 V Power input mating connector .......2-position mini-combicon,...
Page 47: Rf Safety Warning
The NI WSN-3214 is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control, and laboratory use: • IEC 61010-1, EN 61010-1 • UL 61010-1, CSA 61010-1 Note For UL and other safety certifications, refer to the product label, or go to ni.com/...
Page 48: Shock And Vibration
AS/NZS CISPR 11: Group 1, Class A emissions • FCC 47 CFR Part 15B: Class A emissions • ICES-001: Class A emissions The NI WSN-3214 also meets the requirements of the following EMC standards for intentional radiators: • EN 300 328 •...
Page 49: Regulatory Information
Communications Electroniques et des Postes (http://www.arcep.fr) pour la procédure à suivre. Italia: General authorization required for outdoor use. Check with reseller for procedure to follow. E'necessaria un'autorizzazione generale per l'uso esterno. Verificare con i rivenditori la procedura da seguire. © National Instruments NI WSN-3214 User Guide and Specifications...
Page 50 Hereby, National Instruments, declares that this NI WSN-3214 is in compliance with the essential requirements and other relevant provisions of Directive 1999/5/EC. Español Por medio de la presente National Instruments declara que el NI WSN-3214 cumple con [Spanish] los requisitos esenciales y cualesquiera otras disposiciones aplicables o exigibles de la Directiva 1999/5/CE.
Page 51: Online Product Certification
övriga relevanta bestämmelser som framgår av direktiv 1999/5/EG. Íslenska Hér með lýsir National Instruments yfir því að NI WSN-3214 er í samræmi við grunnkröfur [Icelandic] og aðrar kröfur, sem gerðar eru í tilskipun 1999/5/EC. Norsk National Instruments erklærer herved at utstyret NI WSN-3214 er i samsvar med de...
Page 52: Environmental Management
Environmental Management NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers. For additional environmental information, refer to the NI and the Environment Web page at ni.com/...
Page 53: Where To Go For Support
Web sites, which provide up-to-date contact information, support phone numbers, email addresses, and current events. LabVIEW, National Instruments, NI, ni.com, the National Instruments corporate logo, and the Eagle logo are trademarks of National Instruments Corporation. Refer to the Trademark Information at ni.com/trademarks for other National Instruments trademarks.

NI WSN-3214 User Manual And Specifications

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