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NexSens Technology X2-SDL User Manual

Submersible data logger
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X2-SDL Submersible Data Logger
User Guide
Last Revision: 23 February 2023
Date Generated: 28 February 2023
Copyright © 2023 NexSens Technology, Inc.

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Summary of Contents for NexSens Technology X2-SDL

  • Page 1 X2-SDL Submersible Data Logger User Guide Last Revision: 23 February 2023 Date Generated: 28 February 2023 Copyright © 2023 NexSens Technology, Inc.

  • Page 2: Table Of Contents

    Table of Contents 1. General X2-SDL Body Tag Identification What depth of submersion is the X2-SDL rated for? 2. System Power What type of batteries does the X2-SDL take? Apply Power to the X2-SDL Basic Requirements Input Channels Connector Wiring...
  • Page 3 X2 Logger Diagnostic Readings X2 Meta Parameter Descriptions 5. Troubleshooting and Maintenance Sensor(s) Not Found During X2 Auto-Detection At what voltage should batteries be replaced? Cycle Power X2-SDL O-ring Maintenance X2-SDL Storage Requirements 6. Warranty 7. Service Request Service Request...

  • Page 4: General

    1. General X2-SDL Body Tag Identification Each X2-SDL and SDL-V2 data logger has a body tag number etched into the long housing tube contained between the antenna and sensor bulkheads. This number is incorporated into the default name of the device on WQData LIVE and will often be requested by a technical support specialist in the event remote troubleshooting is required or if NexSens-supplied data services require activation or cancellation.
  • Page 5 X2-SDL default device name. Note all SDLs will have a ‘3’ entered in front of the Body Tag display value.

  • Page 6: What Depth Of Submersion Is The X2-Sdl Rated For

    What depth of submersion is the X2-SDL rated for? The X2-SDL is rated for submersion up to 200ft (~60m). Note that the SDL-CAP accessory is required to fully submerge cellular or radio models containing an external antenna. The antenna port of Wi-Fi only models is epoxied closed and may be completely submerged using the...

  • Page 7: System Power

    What type of batteries does the X2-SDL take? The X2-SDL requires (16) D-Cell Duracell Alkaline batteries. D-cell batteries from other manufacturers may have sub-flush negative terminals which can result in poor contact and may affect the consistency of power supplied to the X2-SDL logger.

  • Page 8: Apply Power To The X2-Sdl

    Apply Power to the X2-SDL The X2-SDL has flexible power input choices that provide several options in terms of type and number of power sources. X2-SDL Data Logger Basic Requirements 5-24 VDC [+/-10%] (Reverse polarity protected) Current Draw (Typical @ 12VDC): Low power sleep: 350uA; Logger Active: 35mA; Wi-Fi Transmitting: 43mA;...

  • Page 9: Connector Wiring

    Connector Wiring Power may be applied to the X2-SDL via the UW-6 receptacle port by a UW-USB-485P for connection to a PC, or from a customized solar power kit. Most applications; however, rely on the internal D-Cell Alkaline batteries during deployment.

  • Page 10: Install Batteries In The X2-Sdl Data Logger

    Note: Due to the double O-ring lid seal this will take significant effort to loosen. b. The 3/16″ ball-point hex driver included in the X2-SDL maintenance kit can be inserted into either of the two recesses in the lid to provide extra leverage.
  • Page 11 3. Note the polarity labels affixed to the inside of each battery tube prior to inserting fresh D-cell batteries. Insert (16) D-cell batteries. 4. Thread the battery lid back on to the top bulkhead of the X2-SDL. 5. Rotate the lid clockwise and tighten securely using the hex driver.

  • Page 12: Universal Pinout

    UW-6 Universal Pinout The schematics and table below details the 6-pin plug and receptacle universal pinout for all 6-pin NexSens cables excluding the 6-pin AC adapter. Figure 1: NexSens UW-6 receptacle pinout Figure 2: NexSens UW-6 plug pinout Figure 3: X2-CBMC/SDLMC MCIL-6-FS 6-pin power Figure 4: NexSens MCIL-6 plug pinout port...
  • Page 13 RS-485 B RS-485 B RS-485 B Green RS-485 A RS-485 A RS-485 A iSIC-V2 X2-CB** G2-RAIN X2-SDL* X2-CBMC** *X2-SDL’s purchased after August 2021 do not include secondary power. **Wire colors for the X2- CB/X2-CBMC follow the UW-6 Bulk Pinout G2-EXO X2-SDLMC...

  • Page 14: Buzzer Indicator

    Buzzer Indicator X2-SDL & X2-CB data loggers are equipped with an onboard buzzer to provide audible system status feedback to the user. X2-SDL/X2-CB Buzzer Indicator Status Lookup Event Beep Type Status When power is applied Short beep System boot successful...

  • Page 15: Performing A Measurement System Power Budget

    Performing a Measurement System Power Budget Analyzing a measurement system power budget is a useful practice to help ensure that a proposed system design will meet the monitoring objectives and reliably deliver data. To aid with this, NexSens has developed a power budget tool which can quickly estimate the expected power performance of systems using the most common NexSens buoy platforms, data logger configurations, and commonly integrated NexSens and third-party sensors for deployment locations throughout the world.
  • Page 16 Select sensors from drop-down list.
  • Page 17 b. While the pre-populated sensor list is fairly extensive and frequently updated, there may be cases where a sensor is not listed. In such cases, it is possible to enter up to four devices manually by selecting Custom 1/2/3/4 from the drop-down list. Custom sensor entry.
  • Page 18 c. Once selected, proceed to the Custom User Entry tab of the spreadsheet. Navigate to the Sensor Details section and fill in the prompted information either using data from the device manufacturer or measured data during device testing. Custom sensor data entry.
  • Page 19 d. Note that some instrument types have a number of different configurations which may affect power performance. The predefined sensors in the drop-down list are set up based on a typical configuration and information provided by the manufacturer or NexSens bench testing where applicable. These therefore represent a best approximation based on available information.

  • Page 20: Advanced Custom User Entry

    a. Reserve Days refers to how long the system could operate if starting with near 100% battery charge during an extended period without solar charging, or how long a system without any solar charging can be expected to operate. For solar-charged systems, a rule of thumb is to target at least two weeks (14 days) of reserve power.

  • Page 21: Additional Resources

    Additional Resources CB-Series Buoy Battery Capacities NexSens Solar Panel Photovoltaic Specifications...

  • Page 22: Establish Communication

    3. Establish Communication X2 Data Flow The X2 is designed to provide real-time data to users. The diagrams below outline how the data travels from sensor to user. Wi-Fi X2 to WQData LIVE.

  • Page 23: Cellular

    Cellular X2-C to WQData LIVE.

  • Page 24: Iridium

    Iridium X2-I to WQData LIVE.

  • Page 25: Radio To Cellular

    Radio to Cellular X2-RC to WQData LIVE.

  • Page 26: Radio To Pc

    Radio to PC X2-R to WQData LIVE. Notes: Data is posted to WQData LIVE’s secure MySQL database using HTTP POST protocol Data is transmitted in XML format...

  • Page 27: Wi-Fi

    Wi-Fi Configure Network Settings Wi-Fi only models of the X2 data logger can be configured to upload to the WQData LIVE datacenter over a local wireless network. Establish a connection to the X2’s direct Wi-Fi network. 2. Access the main menu by clicking the menu icon in the top right. X2 Embedded Web main menu.
  • Page 28 A prompt will appear requesting the X2 Wi-Fi to be reset by inserting a magnet into the lid. b. Cycling power (for X2-CB or X2-SDL models) will also accomplish this reset. 7. Disconnect the laptop or mobile device used to configure the logger from the X2’s network to prevent unintentional reconnections.
  • Page 29 Click Save Settings and then Disable reconnection or delete the swipe the magnet (or cycle X2’s Direct network after power) to apply the change. configuration is complete.

  • Page 30: Cellular

    A Static IP and Unrestricted Access are not required. Step 4) Mail SIM card to NexSens Technology for installation and X2 testing It is required that the SIM card for the X2 telemetry be sent to NexSens for pre-shipment installation and testing.

  • Page 31: Install A Sim Card

    Statically ground yourself prior to touching any of the electronics inside the X2-SDL logger. Tools Required: – 3/16″ Ball-Point Hex Driver (included in logger maintenance kit) 1. Use the 3/16″ hex driver to remove the four screws on the bottom bulkhead of the X2-SDL (opposite the white battery lid). X2-SDL screws removed 2.
  • Page 32 SIM card slot 4. Swing the SIM tray open. Open tray on SIM card slot 5. Place the SIM in the tray such that the indentation on the card will align with the same indentation on the holder when closed. Insert SIM card 6.
  • Page 33 Reinsert X2-SDL bolts 8. If the X2-SDL fails to contact the project page on WQData LIVE after being powered back up, verify network coverage at the location is strong and verify the...

  • Page 34: Set An Apn On An X2 Data Logger Using Connect

    Set an APN on an X2 Data Logger Using CONNECT Users who have sourced their own mobile data accounts and installed a SIM card will need to configure the associated APN in the X2 logger using the CONNECT software. Power Up RTU Connect the X2 logger to a PC and launch the CONNECT software.
  • Page 35 3. Select Turn Power ON to startup the X2’s RTU. a. Note that this process may take up to 30 seconds to complete (15-sec typical). b. The RTU will power down every 10 minutes and will require the RTU power to be turned on again. c.
  • Page 36 Verify Current APN Settings 1. To confirm the active APN settings, select and send the AT+CGDCONT? command from the Direct Command list. Response to AT+CGDCONT? command displaying the modem’s currently configured APN profiles. 2. Depending on the model of cellular X2, the system will actively use either the APN setting profiles on the modem.
  • Page 37 b. If the required APN is not on the list, which will often be the case, enter the proper APN enclosed in quotations. Example of setting a custom APN on a 4G Verizon X2. 4. Active cid a. In most instances, only one cid will be necessary and this cid will match the Active cid. However, it is possible to set two different PDP contexts with varying cids.
  • Page 38 Successful connection of a Verizon modem, indicated by the return of an IP address. a. Successful connections will display the IP address the modem was assigned during its connection request. b. Connections that fail will display one of many messages (facilitated by the extended error code activation in step 1).
  • Page 39 CONNECT view modem model command. 2. Check which mode the modem is currently in by entering: AT#FWSWITCH? Check current mode command. Current mode is Verizon. 3. Change the mode by entering: a. AT#FWSWITCH=1,1 (Verizon) b. AT#FWSWITCH=0,1 (AT&T/International) At this point, complete the update by cycling power (turn off and on) the modem. Change from Verizon to AT&T/International mode.
  • Page 40 4. Resend the AT#FWSWITCH? to ensure a successful change. Confirm successful mode change. Change the active SIM card holder on ME90G1-WW The ME90G1-WW worldwide modem contains two SIM card holders. If cellular service is purchased through NexSens, a SIM will be inserted into the SIM holder 0 slot, which is active by default. However, if cellular service is not purchased through NexSens, a SIM will be inserted into the SIM holder 1 slot as a backup.
  • Page 41 AT#GPIO=8,1,1,1 The SIM holder slot 1 is now the active slot. 4. Enable the active SIM card holder by sending: AT#SIMDET=1 SIM holder 1 is enabled. 5. To save the settings in volatile memory, send: AT&W Check that the active SIM holder slot has changed by reading the SIM ID in the Modem Info area, which should show a new SIM ID.

  • Page 42: Iridium

    Iridium Setup Gmail Account to Allow WQData LIVE Access (Iridium) X2 Iridium satellite data loggers transmit data messages via the Iridium network to an email server. The data messages are then downloaded from the email server to the WQData LIVE web datacenter. In order to facilitate this process, NexSens hosts a secure Gmail account as a medium to store and upload data to WQData LIVE.
  • Page 43 4. Use the keypad icon at the top right of the screen to open the Google account settings. Click on Account. Figure 2: Google account. 5. Choose Security. Figure 3: Google Security tab. 6. Scroll down to Signing in to Google. Change the 2-step verification to on.
  • Page 44 Figure 4: Enable 2-step verification. 7. Select App Passwords and under Select app choose Other (custom name). In the space provided enter wqdatalive. Figure 5: Enter wqdatalive and click Generate. 8. Click Generate. A new app password should appear. Copy and save this password to a separate location.
  • Page 45 Figure 6: Generated app password. 9. Insert this app password into the Iridium account information on WQData LIVE while configuring the X2 logger. a. Note: Do not include the spaces shown in the password. b. If the Iridium system was setup previously, all Iridium information entered previously should remain the same, while the password will now be entered as the new generated app password.

  • Page 46: Setup Iridium (Sbd) Data Account

    All Iridium-enabled X2 data loggers must have an active SBD (short-burst data) account in order to send measurement data to WQData LIVE. While NexSens Technology can configure and manage Iridium (SBD) data account plans, users may prefer to set up their own data services.
  • Page 47 2. Select the desired provider from the list. a. Note that every provider will have different SBD plan capacities and pricing. b. It is advisable to check with multiple providers to find the most competitively priced options for the required data amount. Figure 2: Iridium data service provider listing, based on selected region and country.
  • Page 48 c. Having the data sent to a second mailbox address is recommended. 5. If asked, the following features are not required for the account: a. Ring Alerts b. Geo Data Flag c. MO Ack Flag...

  • Page 49: Setup Iridium Logger Through Connect

    Setup Iridium Logger Through CONNECT Satellite/iridium transmission is more expensive than other traditional forms of communication (e.g., cellular, radio, Wifi). Therefore, it is imperative that the end-user only transmit the most useful diagnostic and sensor parameters. The CONNECT software can set these parameters and their log/transmission interval before the data logger transfers data to the web.
  • Page 50 3. Re-apply 12VDC power and listen for the audible beeps or view the LEDs on the appropriate X2 logger model. X2 Pole Mount LED Indicators X2-CB/X2-SDL Buzzer Pattern Indicator If receiving insufficient signal strength, move the logger into an area devoid of overhead obstructions.
  • Page 51 ADMIN | Settings tab. 3. Click on the Advanced Device Remote Configuration drop-down menu and choose the logger. Enter code ‘nexsens’ when prompted. Advanced device remote configuration drop-down menu. 4. Click the UPDATE button underneath Update Binary Format. A prompt should display showing the command was sent successfully. 5.

  • Page 52: Iridium Transmission Delay

    Iridium Transmission Delay Compared to data loggers utilizing cellular, radio, or Wi-Fi telemetry, Iridium systems have an additional step in the data upload process which may cause a delay in the time it takes from the logger recording a measurement to data being posted on WQData LIVE.
  • Page 53 Iridium X2 data flow.

  • Page 54: Radio

    Radio Set Up a NexSens Radio Network Each XBEE radio module that ships with a NexSens radio X2 has a unique identifier. Both the base and field nodes use this identifier to establish connections throughout the radio network. All field radios in the network must have the identifier information for the base station as a destination for their logged data.
  • Page 55 Add the base radio module. 5. The Digi Base Radio station should appear in the Radio Modules list. Establish Connection with the X2 Base Station...
  • Page 56 1. Power on the NexSens base station and click the Link icon next to the Digi Base Radio module to search for the NexSens base station. Digi base radio search for NexSens base station. 2. Once the NexSens base station is found, select Add selected devices at the bottom of the interface.
  • Page 57 NexSens base station found. 3. Open the NexSens base radio settings by selecting the NexSens base station (Example: X2-RC-DG-01300) under the list of radio modules.
  • Page 58 NexSens X2 base radio station. 4. Scroll down to the Addressing section and copy the SH Serial Number High and SL Serial Number Low. a. This is the identifier that will be written into the settings of each field node. NexSens base radio unique serial number.
  • Page 59 Field devices found. 2. A new list of radio modules will appear below the base station. Select one of the new modules to open the module settings. Read the field radio settings. 3. After the settings are completely loaded, scroll down to the Addressing section and insert the identifier copied previously into the DH Destination Address High and DL Destination Address Low.
  • Page 60 4. Complete this process for all of the field radio nodes. Detect Field Radios 1. Power down the entire network, including the base station. 2. On WQData LIVE, Access the Advanced Device Remote Configuration Tool. 3. Scroll to Radio Settings at the bottom of the interface and choose Yes for the New Value. a.

  • Page 61: Connect Sensors

    NexSens to check compatibility. X2-SDL X2-CB X2 Environmental Data Logger X2-SDL Submersible Data X2-CB Buoy-Mounted Data Logger Logger Tier 1 Sensors These sensors will be automatically detected by the X2. If multiple sensors are connected to the same logger, they must be addressed uniquely.
  • Page 62 Analog Analog RS-485 SDI-12 RS-232 Kipp & Zonen Pyranometers Li-COR Underwater and NexSens T-Node FR/TS210 Pro-Oceanus Solu-Blu Terrestrial PAR Sensors Temperature Strings Observator ANALITE Dissolved C02 Sensor NEP5000 [Turbidity] SDI-12 SDI-12 or RS-232 SDI-12 SDI-12 SDI-12 Sea-Bird Scientific Seametrics CT2X Seametrics PT12 Level Seametrics TempHion Sequoia LISST-ABS...

  • Page 63: Tier 2 Sensors

    Tier 2 Sensors These sensors require limited setup prior to connection. The scope of setup varies by sensor type but typically includes setting up a template, configuring the device or selecting the parameter output. These tasks are often done with a separate PC program provided by the sensor manufacturer. The X2 data logger has a pre-defined script for each sensor in this tier.

  • Page 64: Tier 3 Sensors

    Tier 3 Sensors These sensors are not commonly supported by the X2, but can be added through the creation of a user-defined script. The script is written in Lua and utilizes NexSens-created functions to simplify programming. As long as the sensor communicates using SDI-12, RS-485, or RS-232 and can be powered from a 12V supply, it should be compatible with the X2.

  • Page 65: Connect Software

    CONNECT Software User-generated generic scripts are possible to create using the CONNECT software; however, it is recommended to contact NexSens before creating a script. Click the logo below to link to the CONNECT software section of the NexSens Knowledge Base to download and learn about CONNECT.

  • Page 66: Uw Connectors

    UW Connectors UW-8 Sensor Port Pinout NexSens X2 and G2-Series data loggers incorporate UW-8 receptacles for connection of sensor cables with UW-8 plug connectors. The pinout for the UW-8 data logger sensor ports is as follows: Figure 1: NexSens X2/G2 data logger 8-pin (UW-8) sensor port pinout. Pin # SensorBUS Signal Wire Color...

  • Page 67: Plug Pinout

    While this is critical for use on buoys (X2-CB, X2-SDL data loggers) and in other wet environments, users may in some cases choose to install UW Field Wireable Plugs (part number UW-FWP).

  • Page 68: X2 Sensor Detection

    X2 Sensor Detection Traditionally, programming software is required to indicate the communication protocols, sensor addresses, measurement commands, data format, and power requirements of all sensors connected to an environmental data logger. X2 data loggers are designed to simplify the programming and setup process for users by automatically scanning each of its sensor ports for sensors connected to the logger.

  • Page 69: Setup In Wqdata Live

    Setup in WQData LIVE Creating a WQData LIVE Project Data loggers and measurement data are organized into Projects on WQData LIVE. Projects may contain one or more Sites for further organization, and each Site may contain one or more data loggers. To create a Project: 1.
  • Page 70 4. Fill out the fields in the corresponding menu to title the Project, and then click CREATE PROJECT. Figure 3: Create Project interface. 5. The main project Dashboard will appear. Create and name a Site within the new project as desired by going to Admin | Settings at the top, then to the Project/Site tab and selecting New Site.

  • Page 71: Adding A Data Logger To A Wqdata Live Project

    Adding a Data Logger to a WQData LIVE Project During first-time configuration, data loggers are added to WQData LIVE Projects using a Claim Code supplied with each data logger. To assign a data logger using a Claim Code: 1. Log in to WQData LIVE and find the username in the top right hand corner of the page. Mouse over the username to reveal a drop down menu and click PROJECTS.
  • Page 72 3. After selecting or creating a Project, click on the ADMIN tab and then Settings located at the top of the dashboard. Figure 3: Navigate to ADMIN | Settings at the top of the project dashboard. 4. Click on the gray bar that says Project/Site to open a drop-down menu. Choose Sites to open a second drop-down menu.
  • Page 73 6. Add a new logger by entering the Claim Code in the field near the bottom of the Sites menu. Then click Add Device. a. Locate the Claim Code on the serial label attached to the data logger’s Quick Start Guide. Figure 5: Data logger serial label.

  • Page 74: Changing Sensor Log Intervals

    Changing Sensor Log Intervals Configure independent sensor Log Intervals for each device connected to an X2 or G2-Series data logger through the Device Remote Device Configuration tool. To update sensor log intervals in WQData LIVE: 1. Navigate to the Device Remote Configuration tool within the administrator settings.

  • Page 75: Changing Data Logger Transmission Interval

    Changing Data Logger Transmission Interval The Transmit Interval in the Device Remote Configuration Tool determines how often a data logger will power up its telemetry modem to contact the WQData LIVE web datacenter. On each transmission, the data logger will: Upload all newly logged data.

  • Page 76: Run Remote Sensor Detection

    Run Remote Sensor Detection WQData LIVE can remotely run a new sensor detection on an X2 data logger. Before proceeding, reference the X2 Sensor Detection overview and the Auto-Detection Troubleshooting guide. The detection process will permanently alter the X2 data logger programming. Only attempt sensor detection when adding a new sensor to the system or making changes to existing sensor configurations.
  • Page 77 4. Click SAVE and complete the confirmation prompt to submit the command for processing. a. Prior to submitting the sensor detection command, double-check that all considerations laid out in the Sensor Detection Troubleshooting guide have been met. Figure 3: Sensor detection confirmation prompt.

  • Page 78: X2 Logger Diagnostic Readings

    Buoy-mounted X2-CB systems utilizing the solar charged batteries in the data well. c. X2-SDL data loggers accepting power from an SBP500 battery pack (or other external source) via the central 6-pin port on its bottom bulkhead. Depending on the power source*, the following values are typical: a.
  • Page 79 UW-6 plug connector will be registered as Secondary Power. Secondary power is typically only utilized by X2-SDL systems running on internal D-cell batteries. All other systems will return ~0V (as shown), indicating that no secondary power input is present. 5. Sensor Power – The X2 regulates power to its sensor ports. Depending on the state of the system’s primary or secondary power, the X2 will boost or reduce sensor power to maintain a nominal 12V output.
  • Page 80 9. Internal Temperature – Registers the ambient temperature inside the housing of the X2 logger. 10. Internal Humidity – Reflects the amount of moisture in the air inside the X2 housing. Acceptable values will range from a slight negative percentage (effectively zero) up to ~50%. If humidity is reported to be greater than 50%, the desiccant bag inside the X2-CB should be replaced and the...
  • Page 81 As with cell signal strength, the cell status parameter applies to all telemetry types including cellular, radio, Iridium satellite, and Wi-Fi. Values of zero indicate that no errors were observed. If status errors appear frequently and data transmissions are affected, contact NexSens Technology and supply the status error code for troubleshooting.

  • Page 82: Troubleshooting And Maintenance

    Old SLA-type batteries, or those that have fallen to a voltage that is too low, may be unable to output the system current required for detection. Once all of the above have been verified, re-run sensor detection. Contact NexSens Technology for further assistance if the sensor still is not identified.

  • Page 83: At What Voltage Should Batteries Be Replaced

    At a minimum, however, it is recommended that the (16) D-Cell batteries inside an X2-SDL be replaced when the reported system voltage falls to 8V (1V per cell). Information on battery replacement can be referenced here.

  • Page 84: Cycle Power

    5. Once the large washer at the bottom of the white battery lid makes contact with the battery terminals, power will be applied to the SDL. a. For X2-SDL or SDL-V2 data logger models, a buzzer will emit a sound when power is applied.

  • Page 85: X2-Sdl O-Ring Maintenance

    X2-SDL O-ring Maintenance The X2-SDL contains (3) user-servicable O-rings, all located on the white battery lid. All O-rings should be inspected during each battery change. General Maintenance Keep O-rings clear from debris that may affect even surface contact with the housing.
  • Page 86 External EPDM 243 (larger) and EPDM 241 (smaller) Lid O-rings.

  • Page 87: X2-Sdl Storage Requirements

    X2-SDL Storage Requirements The following practices should be carried out when storing an X2-SDL data logger for an extended period of time: Remove all D-Cell batteries inside the data logger. battery installation procedure can be referenced for removal guidance. Batteries left inside may leak and corrode the internal compartment of the logger.

  • Page 88: Warranty

    Limitation of Warranty This warranty is not applicable to any NexSens Technology, Inc. product damage or failure caused by failure to install, operate or use the product in accordance with NexSens Technology, Inc. written instructions; abuse or misuse of the product;...

  • Page 89: Service Request

    7. Service Request Service Request To return equipment for evaluation and repair, request Return Authorization (RA) are the following link: NexSens Return Authorization An email authorization receipt with reference number will be sent to print and include with your shipment. Products within the warranty period will be fixed at no charge.

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