8911-A

8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz SPECIFICATIONS       FEATURES       Acceleration and temperature output Compact design, stud mount Up to 5-year battery life Low power consumption -20°C to +60°C operating temperature 30kHz resonant frequency APPLICATIONS       Remote condition monitoring Reduced installation costs – no cables Designed for harsh environments Quick and scalable deployment Cost effective monitoring for large plants Secure and interference free transmission Wireless PE Condition Monitoring Accelerometer Programmable, Customer Configurable Corrosion Resistant Stainless-Steel & Polymer Housing Wide Bandwdith to >10kHz Exceptional Long Term Stability Superior Measurement Resolution INTRODUCTION The TE model 8911 wireless accelerometer combines a sensor, data collector, digital signal processor, and radio into one compact, battery-operated device that measures both vibration and temperature data. The model 8911 wireless accelerometer uses the LoRaWAN™ communication protocol, offering a simple, reliable and secure means of expanding condition-based maintenance into plant areas where the cost to install wired systems is prohibitive, making data available to existing process control and information systems. The model 8911 incorporates a piezo-electric accelerometer which offers a wide bandwidth to >10kHz, outstanding measurement resolution and superior long-term stability compared to design using MEMS solutions. The 8911 contains digital signal processing that provides an FFT analysis of the vibration being sensed. The output data describes the center frequency, peak value, bandwidth, and percent of the total spectral content for the eight most significant acceleration peaks in the vibration signal. Because of this feature, the 8911 directly provides the data most needed to plot trends and monitor changes in the performance and condition of factory machinery. TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 1 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz ABSOLUTE MAXIMUM RATINGS(1) Parameter Supply voltage Storage temperature Shock limit ESD (1) Maximum Symbol Vdd TS gmax Min Typ -40 -2 Max 3.5 120 2000 +2 Unit V °C g kV Notes/Conditions Replaceable battery Without battery Human body model limits the device will withstand without damage ELECTRICAL SPECIFICATIONS (Unless otherwise specified, all parameters are measured at 24°C @ 3.0V applied) Parameters Symbol Min Typ Max Unit Power Supply Vdd 3 Average supply current Peak supply current Resolution Sampling Time Battery Life Iavg Ipk 35 Vdc 50 12 5 5 µA mA bits Sec Years Notes/Conditions Replaceable CR123 Battery During Xmit One sample/hr (SF7) OPERATING SPECIFICATIONS (ACCELEROMETER) (Unless otherwise specified, all parameters are measured at 24°C @ 3.0V applied) Parameter Symbol Min Typ Max Unit Dynamic range ±50 g Frequency response 1 10k Hz Frequency response 1 15k Hz Resonant frequency fo 30 kHz Transverse sensitivity 5 % Temperature sensitivity Tc -10 5 % Non-linearity ±1 % Resolution 12 bits Residual noise 0.06 g Notes/Conditions ±1db ±3db From -20 to 60°C FSO RMS OPERATING SPECIFICATIONS (TEMPERATURE SENSOR)(1) (Unless otherwise specified, all parameters are measured at 24°C @ 3.0V applied) Parameter Symbol Min Typ Max Unit Temp measurement range Tr -20 60 °C Accuracy ±1.5 °C Resolution 12 bits Notes/Conditions (1)The temperature sensor is located inside the sensor enclosure. As such, it provides the temperature of the sensor interior, not the ambient temperature around the sensor, nor the temperature of surface to which the sensor is mounted. TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 2 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz ENVIRONMENTAL SPECIFICATIONS Parameter Operating temperature Storage temperature Ambient humidity EMI/RFI/ESD protection Ingress protection Symbol Min -20 -40 0 Typ Max Unit 60 °C 120 °C 95 % IEC61000-4-2, ICE61000-4-6 66 External exposed surfaces: 316L stainless steel POM polymer EPDM o-ring 200 grams IP Media compatibility Weight Notes/Conditions Without battery Non-condensing COMMUNICATION SPECIFICATIONS Parameter Wireless protocol Symbol Min Typ Max LoRaWANTM Class A 868 (EU) 915 (USA) Operating freq (region)(1) Transmit power Receiver sensitivity Activation Activation keys 12 -131 OTAA Factory defined 14 -137 Unit Notes/Conditions MHz Other frequencies available Contact factory dBm dBm Custom keys available Contact factory (1) Each operating frequency is part number specific BLOCK DIAGRAM TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 3 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz TYPICAL ACCELEROMETER FREQUENCY RESPONSE CURVE TYPICAL TEMPERATURE RESPONSE CURVE TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 4 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz DIMENSIONS TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 5 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz MOUNTING CONSIDERATIONS AND ACCESSORIES A solid mounting method is required to get optimum performance from the accelerometer. Any loose parts or unsecured mounting features will introduce noise and corrupt the signals of interest. Shown below are six different mounting options available for the 8911 accelerometer. ¼-28 UNF-2A THD 1/4-28:1/4-28 Male Stud P/N AC-D03636 1/4-28 UNF Female THD (Integrated part of the sensor) ¼-28 UNF-2A THD ¼-28 UNF-2A THD M6 x 1.0-6g THD Adhesive Mounting Stud P/N AC-D04210 1/4-28:M6 Male Stud P/N AC-D03665 ¼-28 UNF-2A THD ¼-28 UNF-2A THD M5 x 0.8-6g THD Keeper (removeable) Magnetic Mounting Stud P/N AC-A04209 1/4-28:M5 Male Stud P/N AC-D03664 For the adhesive mounting stud, secure with a rigid adhesive such as epoxy or cyanoacrylate. Do not use pressure sensitive adhesives or foam tapes. For the magnetic mounting stud, remove the keeper prior to attachment. The magnetic mounting will have a 30 lb pull strength when attached to a ferrous surface. TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 6 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz LoRaWAN™ Uplink Payload 0 Battery - - 1 n Peaks Detected 2 3 Temperature (LSB First) 6 7 Integration Size (LSB First) 8 12 13 Peak 1 9 10 Peak 1 11 Peak 1 Peak 2 Frequency (LSB first) Magnitude (LSB first) Ratio … Frequency, Magnitude, Ratio pattern will repeat n times, once for each peak. Total Energy is the total energy (integrated over the whole FFT) Integration Size is the size of the integration around the peak. For each peak detected, the embedded algorithm will integrate over a range around the peak to measure the relative energy around this peak, and will also have the effect to disable detection of new peaks around this detected peak Frequency is the center frequency of the peak detected Magnitude is the magnitude value of the peak detected Ratio is the locally integrated (over ‘Integration Size’ Hz) around this peak compared to the total energy Data conversion: Parameter Battery (%) Temperature (°C) Total Energy (g) Integration Size (Hz) Frequency (Hz) Magnitude (g) Ratio (%) - 4 5 Total Energy (LSB First) Range 0 - 100 -20 to 60°C 0 - 40 0 - 18000 0 - 18000 0 - 40 0 - 100 Resolution 1% / bit 0.1°C / bit 0.001g / bit 1Hz / bit 1Hz / bit 0.001g / bit 1% / bit Offset 0% -100°C 0g 0Hz 0Hz 0g 0% Hex Data Range 0x00 to 0x64 0x0050 to 0x00A0 0x0000 to 0x9C40 0x0000 to 0x4650 0x0000 to 0x4650 0x0000 to 0x9C40 0x00 to 0x64 Error code 0xFF 0xFFFF N/A N/A N/A N/A N/A Custom payload configurations available upon request. The number of peaks detected by the algorithm is currently fixed at 8. This leads to a minimum LoRaWAN™ payload size of 48bytes, preventing the SF12 to be used in the US 915 configuration. Consequently, even if the network requests the device to use SF12, the device will use SF11 as the payload would not fit in the SF12 frame. LoRaWAN™ Configuration Downlink Payload The device sampling period can be adjusted by sending a downlink LoRaWAN™ frame in the following format: 0 1 2 3 4 0x02 Sampling period in seconds (MSB first) Minimum sampling period is 60 seconds, maximum period is 86,400 seconds (24 hours) TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 7 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz WORKFLOW When the sensor powers up it performs a self-diagnostic then tries to join the LoRaWAN™ network using OTAA. The sensor tries to join the network every 10 second and increases the join timer at every failed attempt by 20%, up to 1 hour maximum. After a successful join the sensor enters sampling mode. Once a LoRaWAN™ network has been joined, the sensor will loop through this workflow with a user defined period. If the LoRaWAN™ transmission fails too many times the sensor will consider it has left the LoRaWAN™ network and will go back to joining a network. - Pressing the push button on the sensor at any point during the sensor’s life cycle will automatically trigger a new capture and data analysis. BATTERY LIFE The Sensor battery life will greatly depend on LoRa® spread factor (SF), therefore on sensor proximity from a gateway and network quality. Theorical lifetime 10 Lifetime (year) 8 6 4 2 0 0 2 4 6 8 10 12 14 Transmission period (hours) SF11 TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 SF9 16 18 20 22 24 SF7 Page 8 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz USING AND DISPLAYING DATA FROM THE SENSOR The sensor vibration data in its FFT format can be used to construct visual displays and tables that provide significant information regarding the operation and health of the machinery to which it’s attached. Examples are shown below: Raw Data: Basic Data Table: Peak Frequency (Hz) Amplitude of Peak 2056 2882 694 8 4122 5994 3805 1713 Total Energy 168 46 25 23 20 15 12 10 % of Total Spectral Energy 23 10 5 3 5 2 4 2 2.605g FFT Visual Display: TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 9 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz CONTROLS AND INDICATORS The sensor has a single push button and 2 LEDs that indicate its status, one blue and one red.      Pressing the push button on the sensor at any point during the sensor’s life cycle will automatically trigger a new capture and data analysis. This is useful when setting up the sensor in an application. No waiting for a data capture from the normal cycle. Blue LED: - will light-up for two seconds when sensor requests to join LoRaWAN™ network, and receives join acceptation - will light-up shortly when sensor samples data, transmits LoRaWAN™ payload, receives acknowledgement Red LED: - will light-up for two seconds if the LoRaWAN™ network join request is not accepted - will light-up short shortly if a transmitted LoRaWAN™ payload is not acknowledged Illumination of the colored LEDs can be seen through the translucent cover when it’s attached. To gain access to the push-button and indicator LEDs, simply unscrew the top portion of the sensor housing and locate these components on the PC board. See image below. TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 10 8911 WIRELESS ACCELEROMETER LoRaWAN™ 868/915MHz ORDERING INFORMATION 8911-x A E Part Number AC-D04210 AC-A04209 AC-D03636 AC-D03665 AD-D03664 Tx/Rx Frequency 915 MHz (USA) 868 MHz (EMEA) Mounting Accessories Description Adhesive Mounting Stud Magnetic Mounting Stud ¼ x 28 by ¼ x 28 Double-ended Male Stud ¼ x 28 by M6 Double-ended Male Stud ¼ x 28 by M5 Double-ended Male Stud Note – Unit is shipped without a battery. Batteries are available from any of our distribution partners or at most retail locations that sell batteries. NORTH AMERICA EUROPE ASIA Measurement Specialties, Inc., a TE Connectivity Company Tel: 800-522-6752 customercare.hmpt@te.com MEAS France SAS a TE Connectivity Company Tel: +31 73 624 6999 customercare.lcsb@te.com Measurement Specialties (China), Ltd., a TE Connectivity Company Tel: 0400-820-6015 customercare.shzn@te.com TE.com/sensorsolutions MEAS France SAS and Measurement Specialties (China) , Inc., are TE Connectivity companies. TE Connectivity, TE, TE connectivity (logo) are trademarks. All other logos, products and/or company names referred to herein might be trademarks of their respective owners. The information given herein, including drawings, illustrations and schematics which are intended for illustration purposes only, is believed to be reliable. However, TE Connectivity makes no warranties as to its accuracy or completeness and disclaims any liability in connection with its use. TE Connectivity‘s obligations shall only be as set forth in TE Connectivity‘s Standard Terms and Conditions of Sale for this product and in no case will TE Connectivity be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuse of the product. Users of TE Connectivity products should make their own evaluation to determine the suitability of each such product for the specific application. © 2017 TE Connectivity Ltd. All Rights Reserved. TE CONNECTIVITY SENSORS /// MODEL 8911 02/2020 Page 11