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Sensor Maintenance and Calibration 

 

 

 

 

 

Periodic Maintenance:

  The SPOD is a low maintenance device and is designed to 

operate remotely with no user intervention.  Occasional inspections for damage 

and cleanliness are recommended to maintain optimum performance. 

 

 

Sensor Calibration:  

Depending on application requirements and environmental 

conditions, periodic calibrations may be required to maintain target accuracy.  

Contact Sensit for ordering calibration gases, calibration hardware, and 

calibration instructions. 

 

 

Sensor Replacement:  

The PID sensor assembly is designed to be field 

replaceable.  Sensit recommends factory service when replacing the sensor to 

ensure overall sensor performance.  Contact Sensit for more information. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Summary of Contents for SPOD

Page 1: ...1 SENSIT SPOD Sensor Operation Manual and Configuration Guide Version 1 0 August 12 2019 For Questions Contact jmelby gasleaksensors com ...

Page 2: ... Attached mounting flanges Voltage Requirements 18V 24V DC Charging wired adapter or solar panel Current Requirements 2A max current draw when charging Operating Runtime 3 5 days battery backup 1 Operating Temp 10 C to 50 C 2 Data Outputs Digital wired output 3 3V TTL USB Wireless 4G IoT Cellular Included 2 Optional analytics on server 4 SD card data backup 5 ...

Page 3: ...act the manufacturer for more information 3 Requires SIM card and suitable data plan on AT T or T mobile Verizon service is pending 4 Cloud based analytics can be developed with additional contract 5 When removing SD card to obtain data it is recommended to power off the sensor box prior to reinserting the SD card to avoid possible errors If the system stops responding or any SD errors are observe...

Page 4: ...ies are required 3 Factory calibration conducted with 1ppm isobutylene and ultra zero air 4 PID Sensors are sensitive to high amounts of humidity and may rail at the upper output if humidity is excessive The SPOD contains an internal sensor heater to minimize humidity interference 5 If the unit has been off for an extended period of time it could take several minutes to an hour for the PID reading...

Page 5: ... MQTT Topics HTTP Content Type application x www form urlencoded HTTP Body Field Identifiers ID MODULE STAT DATA MQTT Content Type JSON MQTT Tags deviceId time iodb Post Location Adjustable in Menu APN Adjustable in Menu TLS SSL HTTPS and MQTTS with server authentication3 Notes 1 4G CAT M1 and NB IoT 2 Modem is pending Verizon certification 3 Client authentication possible with additional developm...

Page 6: ...6 Sensor Exterior Features Front Exterior ...

Page 7: ...7 Sensor Interior Features Front Interior ...

Page 8: ... if failure Green LED if successful Charging Status Green LED if Charging Calibration Mode Solid Flashing Blue LED in Calibration Sensor Status Red LED if initialization failure PID or Weather Station SD Card Status Red LED if failure Green LED if successful ...

Page 9: ...or trending toward reasonable values keeping in mind the stabilization time for sensors that have been powered off or exposed to high VOC concentrations Additionally it may take up to 30 seconds for the ultrasonic anemometer to report valid environmental data For information on USB headings and field identification please see page 10 3 When installing orient the weather sensor such that it is poin...

Page 10: ...HTTP or MQTT protocol is selected verify successful initialization after startup with Cellular status If PERIODIC protocol is used wait for required amount of time before cellular post 5 If power is hooked up wait for 1 minute after power up to verify the charging status LED is illuminated Please note that if the battery is completely full the charging status LED will not illuminate 6 When install...

Page 11: ...t Arb Units Field 3 Sensor 2 Temp1 Arb Units Field 4 Heater 2 Output1 Arb Units BATT Battery Voltage Volt CHRG Charging Current mA RUN Operating Current mA TRIG Field 1 Trigger Flag 0 or 1 if threshold exceeded Field 2 Trigger Counter Adjustable Field 3 Sample Flag 0 or 1 if sample acquired LAT2 GPS Latitude Degrees LON2 GPS Longitude Degrees Notes 1 The control circuit board is designed to suppor...

Page 12: ...12 Ultrasonic Anemometer Mounting Instructions ...

Page 13: ...tdoors 2 Install pole on tripod Pole mounting attachment may differ from image below 3 Set leg height of tripod and spread legs with a minimum of 30 from perpendicular 4 For added stability in high wind or long term deployments place sandbags against all legs Catch tab with bag to hold down ...

Page 14: ...f SPOD 6 Use the longer 1 long screw nut to tighten on pole 7 Tighten sufficiently to prevent rotation 8 Place SPOD as far up as possible on pole to avoid blocking anemometer Note The images below are used for reference SPOD appearance will differ from image below ...

Page 15: ...stallation Optional 1 Lift up on side with 2 knobs to unfold panel 2 Fold down angular supports on both sides and remove 2 knobs on bottom 3 Reattach knobs vertical angular supports on both sides flat washer lock washer wing nut ...

Page 16: ...ossible as this will drastically reduce panel output power and efficiency 6 Route cable to SPOD unit 7 Plug cable into SPOD Power USB connection 8 Power on SPOD unit Note Alternative solar mounts and solar panel extension cables can be purchased from Sensit Please contact Sensit for more information if your application requires an alternative solar mounting setup ...

Page 17: ...ter with a serial port terminal software program e g CoolTerm Sensor Quickstart Instructions 1 Connect the USB cable to the SPOD and computer and establish the communication link in the terminal software 2 Turn on power switch and observe initialization process After initializing the microcontroller and printing SPOD information the system will system will prompt the user to Enter Configuration Mo...

Page 18: ...lar modem This is required for communication with any online servers Default Resets all options to the factory default Not recommended without consulting Sensit Display Displays all current settings in the terminal window An example print out is shown below Please not that system settings may differ from device to device depending on the application System DATE 08 09 19 11 57 06 Sensor ID SPOD0010...

Page 19: ...ways on and fixing position Highest power draw INTERVAL GPS turns on at and interval determined by RATIO x ODR SINGLE GPS turns on at power up and remains off until system is reset HEAT Adjust CONSTANT or HUMID heat settings The CONSTANT setting means that the sensor heater is on at all times if enabled The HUMID setting means that the sensor heater is on only if humidity exceeds a predefined thre...

Page 20: ...the initial data may have the wrong date and time until the clock adjusts EXIT Leave the root menu and starts system operation Detailed Cellular Menu Information Menu Item Description Location APN Carrier APN Setting Cellular Menu CREDENTIALS MQTT Username and Password Cellular Menu HOST Server Location Address Cellular Menu NETWORK Cellular Network Configuration Cellular Menu PROTOCOL Data Transf...

Page 21: ...onstantly at interval determined by the output data rate ODR PERIODIC Buffers data according to the RATIO setting at the output data rate After the required number of samples has been collected the modem will turn on post all data and then turn off The interval of cellular cycles is determined by ODR x RATIO RATIO Set the number of required samples between cellular cycles for the PERIODIC cellular...

Page 22: ...Not Searching 1 Registered Successfully 2 Not registered Searching 3 Registration Denied 4 Unknown Status 5 Registered Successfully Roaming CSQ Value dBm Meaning 0 113 Absolutely no Signal 1 111 Very Weak Signal 2 10 109 to 93 Weak Signal 10 20 81 to 73 Moderate Signal 21 30 71 to 53 Strong Signal 31 51 Very Strong Signal 99 Unknown Not Detected X Value ...

Page 23: ...of bytes and checksum If errors are observed verify that the certificate file is loaded on the microSD card and properly named TOPICS Set the publish and subscribe topic used for MQTT cellular protocol EXIT Leave the cellular configuration menu and enter the root menu Detailed Output Menu Information Menu Item Description Location MODE Output Mode Settings Output Menu ODR Data Rate Setting Output ...

Page 24: ...ailed Sample Menu Information Menu Item Description Location SAMPLETEST Test Sample Trigger Sample Menu SAMPLETIME Sample Acquisition Time Sample Menu TRIGGERTIME Time Above Trigger Threshold Sample Menu TRIGGERVAL Trigger Threshold Value ppb Sample Menu EXIT Exit Sample Menu Sample Menu SAMPLETEST Manually toggles the sample collection device for testing the setup SAMPLETIME Sets the duration of ...

Page 25: ...ensor Calibration Depending on application requirements and environmental conditions periodic calibrations may be required to maintain target accuracy Contact Sensit for ordering calibration gases calibration hardware and calibration instructions Sensor Replacement The PID sensor assembly is designed to be field replaceable Sensit recommends factory service when replacing the sensor to ensure over...

Page 26: ...erm is available for Windows Mac and Linux CoolTerm can be downloaded for free from here http freeware the meiers org 1 Extract Software_CoolTerm to the directory of your choosing To avoid certain permissions issues do not extract into Program Files It is recommended to extract to the desktop if possible 2 Open the CoolTerm application You may receive an error indicating that no serial ports are f...

Page 27: ...om the list of available options as shown below All default options should be correct but please verify Click on Port dropdown list and make note of any available ports Plug in the USB cable and wait for hardware installation to finish Click Re Scan Serial Ports The newly added port is the USB cable Select this port ...

Page 28: ...elect Terminal options from list of available options and select Line Mode as shown below Line mode adds a text entry bar at the bottom of the screen that is useful for sending commands to the connectedsensor ...

Page 29: ...of available options and check Ignore Receive Signal Errors Selecting this option reduces the possibility of the serial connection closing upon a received serial error such as connecting or disconnecting the cable or power cycling the unit ...

Page 30: ... as shown in Figure 4 a Click Save As and save the connection settings as a file that you can share or store on the computer b Click Save As Default to change these settings to the default settings when starting the program If you are running off the CD this option will give you an error as there is no default file ...

Page 31: ...al This will be useful for evaluation purposes a To start a capture go to Connection dropdown menu Capture to Textfile Start or hit Ctrl R R Enter a file name and click save b To stop the capture navigate back to the menu entry and click stop or hit Ctrl Shift R Shift R ...

Page 32: ...rranty is rendered Units out of warranty will be repaired for a service charge Internal repair or maintenance must be performed by a Sensit Technologies authorized technician Violation will void the warranty Units must be returned postpaid insured and to the attention of the service department for warranty or repair This warranty gives you specific legal rights and you may have other rights which ...

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