Kestrel DROP D3FW Temperature, Humidity & Barometric Pressure Data Logger
| Brand | NK |
|---|---|
| Origin | USA |
| Model | DROP D3FW |
| Channel Count | Multi-channel |
| Dimensions | 60 × 46 × 24 mm (2.36 × 1.81 × 0.94 in) |
| Mounting | Wall-mountable with integrated D-ring |
| Enclosure Material | Engineering-grade ABS plastic |
| Ingress Protection | IP67 |
| Shock Resistance | MIL-STD-810G compliant |
| Weight | 34 g (1.2 oz) |
| Wireless Range | Up to 30 m (100 ft) line-of-sight via Bluetooth® 4.0+ |
| Logging Interval | Configurable from 2 seconds to 12 hours |
| Memory Capacity | Up to 13,000 data points per parameter |
| Battery Life | Up to 3 months (typical use, 1-min interval) |
| Operating Temperature | –20 °C to 60 °C (–4 °F to 140 °F) |
| Relative Humidity Range | 5–95 %RH (non-condensing) |
| Pressure Range | 300–1100 hPa (mbar) |
| Accuracy (Temp) | ±0.5 °C (±0.9 °F) @ 25 °C |
| Accuracy (RH) | ±3 %RH @ 20–80 %RH |
| Accuracy (Pressure) | ±1.5 hPa |
Overview
The Kestrel DROP D3FW is a compact, ruggedized environmental data logger engineered for continuous, unattended monitoring of temperature, relative humidity, and barometric pressure across diverse operational environments. Unlike handheld meteorological instruments, the DROP D3FW operates autonomously—recording time-stamped measurements at user-defined intervals and storing them onboard for later retrieval or real-time streaming via Bluetooth®. Its core measurement architecture employs NIST-traceable thermistor-based temperature sensing, capacitive polymer humidity sensors, and piezoresistive absolute pressure transducers—all calibrated against internationally recognized reference standards. Designed for field-deployed integrity, the device meets IP67 ingress protection and MIL-STD-810G mechanical shock specifications, ensuring reliable performance in fire response zones, pharmaceutical cold chain validation, HVAC commissioning, agricultural microclimate studies, and industrial facility environmental monitoring where regulatory documentation and audit-ready traceability are required.
Key Features
- Triple-parameter logging: Simultaneous acquisition of air temperature, relative humidity, and atmospheric pressure—with derived metrics including dew point, wet-bulb temperature, heat index, density altitude, and pressure trend analysis.
- Bluetooth Smart® (BLE 4.0+) connectivity enables secure, low-power wireless communication with iOS and Android devices within a 30-meter line-of-sight range.
- Configurable logging intervals from 2 seconds to 12 hours, supporting both high-resolution transient event capture and long-term baseline trending.
- Onboard memory stores up to 13,000 timestamped records per measured parameter, with automatic rollover and non-volatile retention.
- Integrated D-ring mounting hardware facilitates rapid wall, beam, duct, or enclosure attachment without tools—optimized for permanent or semi-permanent deployment.
- Factory-calibrated sensors with documented uncertainty budgets; calibration certificates available upon request for GLP/GMP-aligned applications.
- Automatic time synchronization upon mobile device connection ensures ISO 8601-compliant timestamping aligned with UTC.
Sample Compatibility & Compliance
The DROP D3FW is suitable for monitoring ambient air in indoor laboratories, outdoor burn sites, cleanrooms, transport containers, greenhouses, and military encampments. It does not require sample extraction, flow control, or external power—operating exclusively on two standard CR2032 lithium coin cells. The device complies with IEC 60529 (IP67), MIL-STD-810G Method 516.6 (shock), and ASTM D3359 (adhesion testing for housing coatings). While not certified for intrinsically safe hazardous locations, its low-power design and sealed construction support use in Class I, Division 2 environments when installed per NEC Article 500 guidelines. Data export formats (CSV, PDF reports) support integration into FDA 21 CFR Part 11–compliant workflows when paired with validated Kestrel LiNK App configurations and organizational electronic signature policies.
Software & Data Management
Kestrel LiNK—the free, vendor-provided application for iOS and Android—serves as the primary interface for configuration, visualization, and data export. Each mobile device can concurrently manage up to eight DROP units, displaying real-time values alongside min/max/mean statistics and scrollable time-series graphs. Users may define custom alert thresholds for any logged parameter, triggering visual notifications upon breach. All configuration changes—including logging interval, alarm setpoints, and unit preferences—are stored locally on the device and persist through battery replacement. Exported CSV files include full metadata (device ID, firmware version, sensor serial numbers, UTC timestamps, and measurement uncertainties), enabling traceable data lineage for internal audits or regulatory submissions. No cloud storage is mandatory; all data remains under end-user control unless explicitly shared via email or exported to local file systems.
Applications
- Fire & Emergency Response: Documenting pre-burn ambient conditions (temperature inversion, humidity gradients, pressure stability) to support NFPA 1141-compliant prescribed fire planning and post-incident NIST-style environmental reconstruction.
- Pharmaceutical & Biologics Storage: Monitoring warehouse, refrigerator, and transport container environments in alignment with USP , , and EU GDP Annex 9 requirements.
- Facility Commissioning: Verifying HVAC system performance during ASHRAE Guideline 1–2021 functional testing and TAB (Testing, Adjusting, Balancing) protocols.
- Agricultural Research: Capturing microclimatic variables across orchards, vineyards, and controlled-environment agriculture (CEA) facilities for correlation with crop phenology models.
- Military & Field Logistics: Environmental validation of equipment storage conditions per MIL-STD-810G, including thermal cycling and humidity exposure profiles.
FAQ
Is the DROP D3FW suitable for outdoor deployment in rain or snow?
Yes. Its IP67-rated enclosure prevents dust ingress and withstands immersion in 1 meter of water for up to 30 minutes, making it appropriate for prolonged outdoor exposure.
Can historical data be retrieved after the battery is replaced?
Yes. All logged data resides in non-volatile memory and persists across battery changes without loss.
Does the device support NIST-traceable calibration documentation?
Factory calibration data is embedded in firmware. Optional NIST-traceable calibration certificates—issued by an A2LA-accredited lab—are available at time of purchase or as a post-purchase service.
Is Kestrel LiNK compatible with enterprise MDM platforms?
The app does not integrate directly with Mobile Device Management frameworks, but exported CSV/PDF reports are compatible with common document management and LIMS systems.
What is the recommended maintenance interval?
No scheduled maintenance is required. Sensor drift is less than 0.1 %RH/year and 0.02 °C/year under typical operating conditions; annual verification against a reference standard is recommended for GxP-critical deployments.
