FCC ID: 2A85PA89X1N Wireless Vibration Sensor

WIRELESS VIBRATION SENSOR USER 89X1N Series MANUAL Doc# 20023687-26 Revision 0.1 89X1N WIRELESS ACCELEROMETER USER MANUAL REVISIONS DATE 11/01/2022 Revision Change Description Prepared by Rev 0.1 Initial draft NEW Version Approver PRS 20023687-26 Rev. 0.1, 2022-11-01 2 89X1N WIRELESS ACCELEROMETER USER MANUAL Contents 1. Introduction .......................................................................................................................................... 4 2. General Description .............................................................................................................................. 4 2.1. DEVICE START-UP .......................................................................................................................... 4 2.2. MODES OF OPERATION ................................................................................................................. 5 2.3. DATA COLLECTION ........................................................................................................................ 6 2.4. DATA PROCESSING ........................................................................................................................ 6 2.5. COMMUNICATION LoRaWAN ................................................................................................. 8 2.6. BLUETOOTH LOW ENERGY .......................................................................................................... 9 3. Magnetic Switch .................................................................................................................................. 10 4. LED Indicator ....................................................................................................................................... 12 4.1. LoRaWAN Join request examples ............................................................................................. 12 4.2. LoRaWAN Uplink transmission Examples ................................................................................ 13 5. Presets ................................................................................................................................................. 14 5.1. MANAGING PRESETS ................................................................................................................... 16 5.2. ROTATING PRESET MODE ........................................................................................................... 17 6. Battery ................................................................................................................................................. 18 6.1. BATTERY TYPE ............................................................................................................................. 18 6.2. BATTERY LIFE ............................................................................................................................... 18 6.3. BATTERY REPLACEMENT ............................................................................................................. 19 6.4. BATTERY ESTIMATION ALGORITHM ............................................................................................ 19 6.4.1. CURRENT CONSUMPTION PROFILES ................................................................................... 20 7. Dimensions .......................................................................................................................................... 21 8. Mounting Considerations & Accessories ............................................................................................ 21 9. Certifications & Compliances .............................................................................................................. 23 10. REGLUATORY STATEMENTS ............................................................................................................ 23 FCC and IC ............................................................................................................................................... 23 11. Ordering Information ...................................................................................................................... 26 20023687-26 Rev. 0.1, 2022-11-01 3 89X1N WIRELESS ACCELEROMETER USER MANUAL 1. Introduction TE Connectivitys 89X1N Series Wireless Vibration Sensor is composed of the 8931N and 8911N Family of models. Models in series are either 1-axis (8911N) or 3-axis (8931N) accelerometer, and combine a data collector, and a radio into one compact, battery-operated device that measures both vibration and temperature data. These sensors were designed for hash environment and comes with the ATEX certification. Model 8911N and 8931 wireless vibration sensors use 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. In addition to that, they offers a Bluetooth Low Energy interface to ease the embedded settings configuration at the sensor installation. These sensors incorporate a piezo-electric accelerometer which offers a wide bandwidth to >15kHz, outstanding measrement resolution and superior long-term stability compared to design using MEMS solutions. All models contain digital signal processing capability that provides an FFT analysis of the sensed vibration. 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 89X1N series directly provides the data most needed to plot trends and monitor changes in the performance and condition of factory machinery. 2. General Description The 89X1N Series Wireless Vibration Sensor has two BLE modes and one LoRaWAN mode:

BLE advertising mode - Starts automatically when the battery is inserted. Advertising occurs at a rate of once per second. BLE connected (pairing) mode After each advertisement, the user can initiate a change to connected mode. When connected, the user can configure the device and use other special features. LoRaWAN mode After being configured in the BLE connected mode, LoRa is used to communicate with an external network. 2.1. DEVICE START-UP 1) Insert battery (refer to Installation Manual Doc #20023687-24). On-board LED will flash once upon proper installation. 2) The sensor will begin BLE advertising at the rate of once per second. 3) After the first advertisement, the sensor will transmit a Join Request on the LoRa frequency. If successful, sensor data will be transmitted via uplink messages at intervals determined by the sensor default settings. BLE features are disabled during the LoRa communications. 20023687-26 Rev. 0.1, 2022-11-01 4 89X1N WIRELESS ACCELEROMETER USER MANUAL 4) Once LoRa communications are complete, the sensor will revert back to BLE advertising. 5) During advertising, the user can respond and establish the BLE Connected (or pairing) mode. While in Connected mode, the user can configure all sensor variables such as LoRa transmit interval and FFT features. 6) At sixty minutes after start-up, all BLE features are disabled, and data communications will proceed via the LoRa connection. The communication parameters will follow the settings established during the BLE Connected mode time. The sensor configuration can be adjusted via LoRa communications just as it was during the initial sixty-minute BLE time. 7) At any time after the initial sixty-minute BLE mode operation, a new sixty-minute period can be initiated by placing a magnet close to the magnet symbol on the sensor housing. Depending on the how the magnet is applied, either the new BLE mode can be initiated, or the sensor can be reset. See section 4 regarding the Magnetic Switch. 2.2. MODES OF OPERATION The device operation can be summarized by the following state machine diagram. 20023687-26 Rev. 0.1, 2022-11-01 5 89X1N WIRELESS ACCELEROMETER USER MANUAL 2.3. DATA COLLECTION Sensor measurements are performed and transmitted at a configurable interval from 1 min up to 24 hours. This is driven by the Measurement interval parameter. Upon wake-up, the device powers the sensing element and waits for about 3 seconds to let the accelerometer boot and stabilize its output. A measurement consists of reading the battery level, temperature, and a set of 4096 acceleration values at a configurable rate. Data Battery level Temperature Acceleration Unit

C mg Accessibility LoRaWAN, BLE LoRaWAN, BLE None 2.4. DATA PROCESSING The data processing signal chain transforms the acceleration raw data into frequency peaks. 20023687-26 Rev. 0.1, 2022-11-01 6 89X1N WIRELESS ACCELEROMETER USER MANUAL Acceleration data is collected at a chosen sampling frequency. Raw data passes through an anti-aliasing filter. Once a set of acceleration readings is measured (4096 points), the embedded algorithm removes the DC signal (to remove the bias voltage of the sensing element) and multiplies the results by the sensor element calibration sensitivity (mV/g). The algorithm then applies a Hann window to the signal and converts it into a normalized FFT spectrum. Finally, a peak search algorithm extracts the most significant peaks from the spectrum. Certain data is saved for each of the peaks:

Parameter Peak Frequency Peak RMS magnitude Ratio Description Frequency of the peak (Hz) Single frequency peak PMS magnitude (g) Ratio of energy. Maximum peak magnitude plus associated bins divided by total spectrum energy. Note that only Peak values are accessible by the user. Raw data and raw FFT spectrum are stored for internal computation and are not available outside the sensor. From this point, several customer defined options are available to further process the data into useful output information. The customer can establish and configure up to eight windows across the FFT spectrum. For each window, the user can configure the following parameters:

Parameter Peak number Number of bins Description Number of peaks to be found (0 to 24) Number of bins around the main beam to be integrated into the ratio output. This parameter can be used to filter side lobes and avoid multiple peaks found around the same frequency Minimum frequency Maximum frequency Minimum frequency of the search window Maximum frequency of the search window These define the bandwidth of each window 20023687-26 Rev. 0.1, 2022-11-01 7 89X1N WIRELESS ACCELEROMETER USER MANUAL By default, no windows have been established or configured. The peak search covers the full spectrum. Typical FFT spectrum showing the highest eight peaks. It is possible to program up to 8 custom windows to define several regions of interest. Any peak ouside the windows will be ignored. Typical FFT spectrum showing eight peaks and 3 windows 2.5. COMMUNICATION LoRaWAN 20023687-26 Rev. 0.1, 2022-11-01 8 89X1N WIRELESS ACCELEROMETER USER MANUAL The device includes a LoRaWAN MAC 1.0.3 rev A compliant interface (see LoRaWAN 1.0.3 Specification). It operates as a Class A end-device. The LoRaWAN communication protocol operates in an unlicensed radio spectrum. The part number must be selected to match with the region of operation and be in line with the local regulation. Region Europe (EU) United State (US) Frequency 868 MHz 915 MHz Channel Plan EU862-870 US902-928 Common name EU868 US915 The LoRaWAN upload interval can be configured by the customer for any time between one minute and 24 hours (in one-minute steps). Data upload consists of this information:

Battery status Sensor internal temperature All FFT data as configured by the user Raw sensor data (time domain accelerometer signal) is not available for upload All customer configurable parameters can be adjusted via LoRaWAN using a data download:

Reading/upload interval Number of peaks Number of bins around the peaks Number of windows Window minimum frequency Window maximum frequency Many of the LoRaWAN communication features are adaptive and depend on the network quality. The parameters are negotiated and optimized with the connected gateway. LoRaWAN communications are subject to various regulatory bodies around the world and features in the device firmware help maintain compliance. 2.6. BLUETOOTH LOW ENERGY The device includes a Bluetooth 5.0 Low Energy compliant interface. This is a low power communication technology which should be used at short distances. It makes the 89X1N a connectable beacon which acts as a peripheral by default and switches to a server role (pairing mode) once a remote device (central) is connected. The BLE interface should be used for device configuration only. BLE is activated automatically upon battery insertion. After one hour, the BLE is de-activated to conserve battery energy. BLE can be re-activated by using the magnet switch. After one hour, BLE is de-activated again. 20023687-26 Rev. 0.1, 2022-11-01 9 89X1N WIRELESS ACCELEROMETER USER MANUAL 3. Magnetic Switch The 89X1N has an internal reed switch. This switch is activated when a strong magnet is close to the magnetic sensor location. The magnetic switch location is indicated by the magnet icon on the plastic housing. The magnet must be of sufficient strength and proximity to create a magnetic field of 25 mT at the switch location. 20023687-26 Rev. 0.1, 2022-11-01 10 89X1N WIRELESS ACCELEROMETER USER MANUAL Two different functions are available depending on the user action:

User action Function Activates BLE for another one hour plus trigs a new measurement and a LoRaWAN transmission (uplink if joined, else join request). Resets the sensor. Short tap Hold magnet for 10+

seconds LED One short blink. If user holds the magnet close to the switch for a longer duration, the LED will blink faster. Remove the magnet to only initiate a transmission. Else it going to initiate a sensor reset. Wait for at least 10 seconds, to see the very fast blink. Release the magnet once a very long orange led appears LED indicator 20023687-26 Rev. 0.1, 2022-11-01 11 89X1N WIRELESS ACCELEROMETER USER MANUAL 4. LED Indicator The orange LED indicates the state of the 89X1N. Category Mode Power-on/Reset Description Led turned on at start up to confirm the battery insertion. Join request message sent Pattern A 2 sec long on 3 very short blinks LoRaWANjoin request Uplink Success Fail Status Sending uplink message Operation successful Operation failed The time plots below show the different flash sequences that occur for various actions the sensor is taking. very short blink very short blink 1sec long on 4.1. LoRaWAN Join request examples A normal join request gives 3 fast blinks (few milliseconds on), a 6 second delay then another short blink. In case of error, the LED is turned on for about 1 second. Scenario #4: A LoRaWAN join request is shown with 3 short blinks (few milliseconds on) and about a 6 second later, another short blink (join accept from the gateway). Scenario #5: For EU-868 region, if an error pattern (1 sec on) is shown just after the 3 blinks, it means the device hasnt sent the message due to duty cycle restrictions. Scenario #6: In case no response from the gateway, and after about 6 sec after the 3 short blinks, the LED is turned on for about 1 second. 20023687-26 Rev. 0.1, 2022-11-01 12 89X1N WIRELESS ACCELEROMETER USER MANUAL 4.2. LoRaWAN Uplink transmission Examples Scenario #1: A normal uplink transmission gives 1 short blink (few milliseconds on) and few seconds later, another short blink (ack from the gateway). Scenario #2: For EU-868 region, if an error pattern (1 sec on) is shown just after a short blink, it means the device hasnt sent the message due to duty cycle restrictions. Scenario #3: In case no response from the gateway (Confirmed message up needs a downlink with an acknowledge), delay is about 2 sec after the short blink, the LED is turned on for about 1 second (nack). 20023687-26 Rev. 0.1, 2022-11-01 13 89X1N WIRELESS ACCELEROMETER USER MANUAL 5. Presets The 89X1N has several adjustable functions that tailor the output data to meet user needs. To easily manage these functions, the 89X1N has a feature called Preset. This feature allows the user to combine functions into commonly used or unique preset configurations. The presets are divided in three different categories:

User: editable area which allows the user to create his own configurations. Factory predefined: read only preset which are callable for an easy and fast configuration Factory customer predefined: same as above, read-only and hidden area reserved for identified customers including their own private settings By default, the 89X1N uses the User preset 0. Any change to the sensor settings such as Bandwidth, Measurement interval, Windows count will affect the user preset 0 only. The table below shows the various preset configurations. There are 16 user adjustable configurations (ID 0 15) and 15 factory predefined configurations (ID 64 78). BW

(Fs/2.56

) Meas interva l Window s Count Windows FreqMi n FreqMa x Integ bin Peak s Category Preset Name User User preset 0 User preset 1 User preset 15 89X1_Legac y ID 0 1

.. 14.4k 1 hour 14.4k

.. 1 hour

.. 15 14.4k 1 hour 64 14.4k 1 hour Factory Predefine d BW1K6_ULP 65 BW4K8_ULP 66 BW9K6_ULP 67 BW1K6_LP 68 1.6k 4.8k 9.6k 1.6k BW4K8_LP 69 4.8k BW9K6_LP 70 BW1K6_STD 71 BW4K8_STD 72 BW9K6_STD 73 74 BW1K6_HR 75 BW4K8_HR BW9K6_HR 76 BW9K6_RTH 77 BW1K6_RTL 78 9.6k 1.6k 4.8k 9.6k 1.6k 4.8k 9.6k 9.6k 1.6k 1 day 1 day 1 day 0.5 day 0.5 day 0.5 day 1 hour 1 hour 1 hour 10 min 10 min 10 min 5 min 55 min 0 0

.. 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 bandwidth bandwidth

.. . bandwidth bandwidth 0 0 0 0 0 0 0 0 0 0 0 0 1.6k 0 1.6k 4.8k 9.6k 1.6k 4.8k 9.6k 1.6k 4.8k 9.6k 1.6k 4.8k 9.6k 9.6k 1.6k 20 20

.. 20 20 4 4 4 4 4 4 4 4 4 4 4 4 4 4 8 8

.. 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 8 14 20023687-26 Rev. 0.1, 2022-11-01 89X1N WIRELESS ACCELEROMETER USER MANUAL 20023687-26 Rev. 0.1, 2022-11-01 15 89X1N WIRELESS ACCELEROMETER USER MANUAL 5.1. MANAGING PRESETS By default, the sensor uses the User Preset 0. It is possible to switch between 2 presets by writing the preset identifier to be loaded in a specific register. It can be done anytime. Once the preset loaded, the parameters shown in the previous table are applied and are instantaneously effective. If the selected preset is a user preset, the parameters of the active preset can be modified (and saved) in the usual way (over BLE or LoRaWAN) using the default commands. 20023687-26 Rev. 0.1, 2022-11-01 16 89X1N WIRELESS ACCELEROMETER USER MANUAL 5.2. ROTATING PRESET MODE In addition to the presets, the 89X1N implements a feature called Rotating mode. This provides the user a way to alternate between two presets continuously. After the execution of a preset, the second preset queued in the mode will be loaded, then once executed it comes back to the first. The example below shows how to take advantage of the rotating mode. Here 2 presets are configured with 2 different bandwidth and measurement interval. The self-Rotating mode automatically switches between #0 and #1 without any external user action required. With the example, every 1 hour will result of having 2 measurements: one with a high frequency band and another (5min later) with a low bandwidth but with a higher resolution. 20023687-26 Rev. 0.1, 2022-11-01 17 89X1N WIRELESS ACCELEROMETER USER MANUAL 6. Battery 6.1. BATTERY TYPE To meet various certification requirements, the following battery must be used:

Parameters Manufacturer Reference Technology Nominal voltage Capacity at 20C Operating temperature range Typical value SAFT LS 17330 Primary lithium-thionyl chloride (Li-SOCl2) 3.6 V 2100 mA

- 60C/+ 85C 6.2. BATTERY LIFE Depending on customer settings (measurement interval) and on LoRaWAN network quality, the 89X1N battery life could go up to 10 years. The number of measurements per day will affect the battery life. More measurements will reduce the battery life. Theorical lifetime 10

) r a e y

e m i t e f i L 8 6 4 2 0 0 2 4 6 8 10 12 14 16 18 20 22 24 Transmission period (hours) SF7 SF9 SF11 20023687-26 Rev. 0.1, 2022-11-01 18 89X1N WIRELESS ACCELEROMETER USER MANUAL 6.3. BATTERY REPLACEMENT The 89X1Ns battery must be replaced if depleted. Unscrew the plastic housing and remove it from the base. Carefully use a small tool (such as a flat screwdriver) to remove the battery. Note that it MUST be replaced by the same battery type as shown above. Substitute batteries may damage and/or bring uncontrolled behavior to the sensor. Double check the polarity and then insert the new battery inside the holder. Re-attach the plastic cover on the sensor. Refer to the Installation Manual (Doc# 20023687-24} for specific details regarding battery installation and replacement. When complete, the battery life estimator in the firmware must be reset to a full battery status. 6.4. BATTERY ESTIMATION ALGORITHM 20023687-26 Rev. 0.1, 2022-11-01 19 89X1N WIRELESS ACCELEROMETER USER MANUAL 6.4.1. CURRENT CONSUMPTION PROFILES 20023687-26 Rev. 0.1, 2022-11-01 20 89X1N WIRELESS ACCELEROMETER USER MANUAL 7. Dimensions 8. Mounting Considerations & 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 89X1N accelerometer. 20023687-26 Rev. 0.1, 2022-11-01 21 89X1N WIRELESS ACCELEROMETER USER MANUAL 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. Note Some mounting accessories may be supplied with sample orders. For production deliveries, desired mounting accessories must be ordered as a separate item. 20023687-26 Rev. 0.1, 2022-11-01 22 89X1N WIRELESS ACCELEROMETER USER MANUAL 9. Certifications & Compliances CERTIFICATIONS 8911N and 8931N Wireless Sensors with characteristic (EX) in model name are certified for Intrinsic Safety to the following classification:

IS Class I, Div1, Groups A, B, C, and D;

Class I Zone 0, AEx ia IIC T4 Ga;

Ex ia IIC T4 Ga;

ll 1 G Ex ia IIC T4 Ga Please see section 12 for details on how to order. 10. REGLUATORY STATEMENTS FCC and IC This Radio Equipment is Certified for FCC (US) and ISED (Canada). This equipment does not support simultaneous transmissions. Changes or modifications not expressly approved or authorized by TE Connectivity for compliance could void the user's authority to operate the equipment. FCC Warning:

THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES.OPERATION IS SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY NOT CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE UNDESIRED OPERATION. Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does not cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to correct the interference by one or more of the following measures:

20023687-26 Rev. 0.1, 2022-11-01 23 89X1N WIRELESS ACCELEROMETER USER MANUAL Re-orient or relocate the receiving antenna Increase the separation between the equipment and the receiver Connect the equipment to an outlet on a circuit that is different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. Industry Canada (IC) Warning:

This device complies with ISED Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Le prsent appareil est conforme aux CNR dISED Canada applicables aux appareils radio exempts de licence. Lexploitation est autorise aux deux conditions suivantes : (1) lappareil ne doit pas produire de brouillage, et (2) lappareil doit accepter tout brouillage radiolectrique subi, mme si le brouillage est susceptible den compromettre le fonctionnement. IMPORTANT NOTE:

Radiation Exposure Statement:

This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. Dclarationd'exposition aux radiations:

Cetquipementestconforme Canada limitesd'exposition aux radiations dans un environnement non contrl. Cetquipementdoittreinstall et utilis distance minimum de 20cm entre le radiateur et votre corps. 20023687-26 Rev. 0.1, 2022-11-01 24 89X1N WIRELESS ACCELEROMETER USER MANUAL EU Conformity Hereby, Measurement Specialties (China), Ltd. a TE Connectivity Company, declares that this Wireless Vibration Sensor is in compliance with essential requirements and other relevant provisions of the following directives:

Directive 2014/53/EU Directive 2014/30/EU Directive 2014/35/EU Model Families: 8911N & 8931N Product Description: Wireless Vibration Sensor Operating Bands: BLE 2.4GHz, Lora 868MHz Max Output Power for E.U. Unit Configuration, BLE: +1.654dBm (-2.476 dBm EIRP) Data Communication, Lora: +5.252dBm (+7.402 dBm EIRP) Manufacturer/Brand: TE Connectivity Ltd Manufacturer:

Measurement Specialties (China) LTD No 26 Langshan Road 518057 Shenzhen-Nanshan District, China European Contact:

TE Connectivity Sensors France 4 Rue Gaye Marie 31027 Toulouse France 20023687-26 Rev. 0.1, 2022-11-01 25 89X1N WIRELESS ACCELEROMETER USER MANUAL 11. Ordering Information Model Number:

8 9 1 N -

Sensor Axis 1 Uniaxial 3 Triaxial Certification NX None EX Explosive Atmospheres:

ATEX/IECEx/US/CANADA IS CL I, DIV 1, GRP A, B, C, D, T4;

CL 1. ZN 0, AEx ia IICT4 Ga;

II 1 G, Exia IIC T4 Ga;

Tx/Rx Frequency A 915 MHz (USA) E 868 MHz (EMEA) Part Number AC-D04210 AC-A04209 AC-D03636 AC-D03665 AD-D03664 Mounting Accessories Description Adhesive Mounting Stud Magnetic Mounting Stud x 28 by x 28 Double-ended Male Stud x 28 by M6 Double-ended Male Stud x 28 by M5 Double-ended Male Stud 20023687-26 Rev. 0.1, 2022-11-01 26 89X1N WIRELESS ACCELEROMETER USER MANUAL 20023687-26 Rev. 0.1, 2022-11-01 27

For all Models containing 8911N and 8511N in their name convention Trademark Label Product Label EX Label NX Label 2022 TE Connectivity. Confidential & Proprietary. Do not reproduce or distribute externally including non-authorized representatives and distributors. Create a sustainable future by limiting print copies, and recycling paper. For all Models containing 8931N and 8531N in their name convention Trademark Label Product Label EX Label NX Label 2022 TE Connectivity. Confidential & Proprietary. Do not reproduce or distribute externally including non-authorized representatives and distributors. Create a sustainable future by limiting print copies, and recycling paper.

Measurement Specialties (China), Ltd. C5266091_X10_Ed.2 Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 Subject: Request for Confidentiality FCC ID: 2A85PA89X1N To Whom It May Concern, Date: May. 05, 2022 Pursuant to the provisions of Sections 0.457 and 0.459 of Commission's rules

(47CFR0.457, 0.459), we are requesting the Commission to withhold the following attachment(s) as confidential document from public disclosure. Exhibits ID Label/Location Attestation Statement External Photos Block Diagram Schematics Test Report Test Setup Photos Users Manual Internal Photos Parts List / Tune Up RF Exposure Info Operational Description Cover Letter(s) SDR Software / Security Info Long-Term Confidentiality No No No No No NOTE 1 NOTE 1 No No Short-Term Confidentiality NOTE 2 No No No No No No NOTE 1: Long-Term Confidentiality may be permitted under special conditions (See II. LONG-TERM CONFIDENTIALITY, Section 3 of KDB 726920, use last in force) NOTE 2: Short-Term Confidentiality can be requested for a maximum of 180 days from the date of the grant. Above mentioned document contains detailed system and equipment description are considered as proprietary information in operation of the equipment. The public disclosure of above documents might be harmful to our company and would give competitor an unfair advantage in the market. In case of short-term Confidentiality, the applicant requests the exhibits selected above are withheld from public view for a period of __180__ days from the date of the Grant of Equipment Authorization and prior to marketing. It is our understanding that all measurement test reports, FCC ID label format and correspondent during certification review process cannot be granted as confidential documents and those information will be available for public review once the grant of equipment authorization is issued. 1/1 C5266091_X10_Ed.2 Sincerely, Signature:

Name: Paul Li Title: Staff R&D Product Development Engineering 1/1

C5266091_X8_Ed.1 Letter of Authorization Measurement Specialties (China), Ltd. Company: Measurement Specialties (China), Ltd. Address: No. 26 Langshan Road, Shenzhen High-Tech Park (North) Nanshan District, Shenzhen 518057, China Product Name: Wireless Vibration Sensor Model Number: 8911N-NX-A, 8911N-EX-A, 8931N-NX-A, 8931N-EX-A FCC Identifier: 2A85PA89X1N We authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, to act on our behalf on all matters concerning the above named equipment. Any individual within LGAI Technological Center S.A. is authorized to act on our behalf and take action on the application. We declare that authorize LGAI Technological Center S.A., Ronda de la Font del Carme, s/n, 08193 Bellaterra, Spain, is allowed to forward all information related to the approval project to the Federal Communication Commission and to discuss any issues concerning the approval application. Any and all acts carried out by LGAI Technological Center S.A. on our behalf shall have the same effect as acts of our own. Name: Paul Li Date: May 05, 2023 Title: Staff R&D/Product DVL Engineer Signature of applicant:

1/1

US Agent for Service of Process LETTER OF ATTESTATION C566091_X23_Ed1 TO:

Office of Engineering Technology Federal Communications Commission 7435 Oakland Mills Road Columbia, MD 21046 US Agent for Service of Process:

Company Name: TE Connectivity FRN: 0033410929 Vincent Wong Contact Name:

Address: 6801 Kaiser Drive, Fremont, CA USA 94555 Telephone1-341-465-2096 Email: vincent.wong@te.com This letter is to confirm that the US Agent for Service of Process accepts responsibility to act as a local representative on behalf of (Measurement Specialties (China), Ltd.). The US Agent for Service of Process is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause 2.911. Applicant:

Company name: Measurement Specialties (China), Ltd. Product Description: Wireless Vibration Sensor 2A85P Grantee code:

2A85PA89X1N FCC ID:

Contact Name:

Paul Li Address: No. 26 Langshan Road Shenzhen High-Tech Park (North) Nanshan District Shenzhen 518057 China Telephone No: +8675533305088 (4400) Email: paul.li@te.com The Applicant is aware of and agrees to comply with the requirements outlined in the FCC Equipment Authorization Program, Report and Order FCC 22-84, and clause 2.911. Date: Date: 02/07/2023 Applicants Name:

Title: Staff R&D/Product DVL Engineer Signature US Agent for Service of Processs Name:

Vincent Wong Title: Mgr. R&D/Product DVL Engineer Signature 1/1

No. 26 Langshan Road Shenzhen High-Tech Park (North) Nanshan District Shenzhen 518057 Tel (+1) 234 567 8901 Measurement Specialties (China), Ltd. A TE Connectivity Company Declaration for model numbers We, Name:

Address: No. 26 Langshan Road Shenzhen High-Tech Park (North) Nanshan District Shenzhen Measurement Specialties (China), Ltd. 518057 China City:

Country: China Shenzhen Hereby declare that this equipment:

Product description: Wireless Vibration Sensor Type designation(s): 8911N-NX-A, 8911N-EX-A, 8931N-NX-A, 8931N-EX-A Trademark:

TE Connectivity The differences between all model numbers are in the following table:

Product Description or Discrepancy All models are identical except for Detection Angle (1 represents uniaxial and 3 represents triaxial) and explosion-proof performance (EX represents ATEX and NX represents Non-ATEX). Model 8911N-EX-A and 8931N-EX-A were chosen for final test. The circuit design and layout between of all model numbers are the same. Name: Paul Li Title: Staff R&D/Product DVL Engineer Date: Dec.09.2022 Signature of applicant: