01 SYSTEM OVERVIEW / HX-4 FIELD MONITOR
FIELD TELEMETRY BOARD — UNIT HX-4-7109
STATION ID: 44.98°N 93.26°W
PARAMETER
LIVE FLAP READOUT
OPERATING STATE
ATMOSPHERIC TEMP
SOIL MOISTURE VWC
BAROMETRIC PRESSURE
BATTERY RESERVE
FIG. 01
HX-4 CHASSIS HOUSING SCHEMATIC
Milled aerospace aluminum housing with sealed silicone O-ring gaskets. IP68 submersible rating to 2 meters for 48 continuous hours.
02 FIELD CONFIGURATION / MODULE SUBSYSTEMS
REF 01
ATMOSPHERIC PROBE
Dual platinum RTD temperature and capacitive relative humidity array with sintered bronze shield.
REF 02
SOIL INPUT
High-frequency FDR dielectric permittivity sensor measuring volumetric water content and electrical conductivity.
REF 03
GNSS RECEIVER
Multi-band GPS/GLONASS/Galileo receiver with integrated ceramic patch antenna for sub-meter georeferencing.
REF 04
BATTERY MODULE
Lithium Iron Phosphate (LiFePO4) 12.8V 7Ah hot-swappable pack with integrated solar charge controller.
REF 05
DATA PORT
Mil-spec 8-pin waterproof bayonet coupling supporting RS-485, USB 2.0 Host, and direct LoRaWAN telemetry.
03 OPERATING PROCEDURE / PRE-DEPLOYMENT CHECKLIST
01
INSPECT
Examine enclosure seals, connector pins, and desiccant indicator window for moisture ingress.
02
POWER
Connect LiFePO4 battery pack and verify continuous 12.8V bus voltage on internal rail.
03
CALIBRATE
Perform 2-point relative humidity verification using standard saturated salt reference chambers.
04
POSITION
Mount chassis on non-magnetic surveyor tripod at 1.5m standard WMO observation height.
05
RECORD
Initiate baseline telemetry logging to internal flash memory at 1-second sample cadence.
06
VERIFY
Confirm satellite telemetry handshake and sign off pre-deployment QA validation record.
04 LIVE SPECIFICATION / ENGINEERING TOLERANCES
| SPECIFICATION PARAMETER | RATED TOLERANCE / RANGE | FIELD CONDITION READOUT | COMPLIANCE STATE |
|---|---|---|---|
|
OPERATING TEMPERATURE
Continuous rated range in ambient conditions
|
-40.0°C to +85.0°C (-40°F to +185°F) | ||
|
BATTERY RUNTIME
Internal LiFePO4 pack at 60s sample interval
|
380 Hours Continuous (Solar Autonomous) | ||
|
ENVIRONMENTAL RATING
Ingress protection against dust and liquid
|
IP68 (2.0m depth / 48 hrs immersion) | ||
|
SENSOR TOLERANCE
Atmospheric temperature absolute accuracy
|
±0.08°C at 20°C (NIST Traceable) | ||
|
DATA INTERVAL
Programmable burst or continuous cadence
|
100 ms to 3600 s (User Selectable) | ||
|
DEVICE MASS
Full field assembly including battery module
|
1,420 g ± 15 g (3.13 lbs) |
05 & 06 FIELD NOTES & SERVICE NOTICES
05 / OPERATOR FIELD NOTES
3 VERIFIED RECORDS
SITE 04B / TUNDRA RESEARCH TRANSECT
2026-08-14 09:15 UTC
HX-4 unit deployed at peatland permafrost monitoring plot. Calibration offset verified with reference dry-well thermometer. Zero drift observed across 72h continuous run.
SITE 12A / ALPINE BASIN DEPLOYMENT
2026-08-12 16:40 UTC
Ambient temperature plummeted to -28.4°C during frontal passage. Solar charging suspended automatically per low-temp lithium safeguard protocol. Internal heating element engaged.
REVISION ANNOTATION / REV 04.1
2026-08-01 11:20 UTC
Firmware v4.12 applied. Telemetry compression enabled on LoRaWAN uplink. Memory buffer efficiency increased by 38%.
06 / FIELD NOTICES
▲ CAUTION / NOTICE 08-B
Do not disconnect the atmospheric probe cable while the main 12.8V power rail is energized. Electrostatic discharge into ungrounded RTD sensor terminals may cause permanent calibration drift exceeding ±0.5°C.
ℹ NOTE / DIRECTIVE 14-A
When operating in environments below -20°C, ensure the external solar charge regulator is set to "Cold Battery" mode to prevent dendrite formation in the LiFePO4 cells during rapid charging cycles.
07 DOCUMENTATION & TECHNICAL REFERENCES