Nakshatra
Temperature + humidity
Single-channel WiFi temperature and humidity logger, internal or external sensor.
- Range
- −30 to +70 °C · 0–100 %RH
Vayu – GSM Data Logger for Remote Sites & Reefer Trucks
Vayu is a GSM data logger that reports over a SIM card, so it keeps working at remote sites and on vehicles where Wi-Fi does not reach. It measures temperature and humidity and suits reefer trucks and outdoor locations.
GSM versions are available. Contact us to confirm network compatibility for your country.
- Measures
- Internal temperature + RH
- Temperature range
- −30 to +70 °C
- Humidity range
- 0–100 %RH
- Sensor
- Internal
- Battery
- 5000 mAh
- Measures
- Internal temperature + RH, plus external temperature probe
- Temperature range
- Internal −30 to +70 °C; external −100 to +70 °C
- Humidity range
- 0–100 %RH
- Sensor
- Internal + external probe
- Probe / cable
- 3 m external probe
- Battery
- 5000 mAh
Showing Vayu
The name
Why We Call It Vayu
Sanskrit "Vayu" means air or wind, which reaches everywhere. Vayu monitors where Wi-Fi doesn't reach.
Key features
Vayu: GSM Data Logger Features
Best for: Remote sites, reefer trucks, outdoor and no-Wi-Fi locations.
- SIM-based GSM connectivity: no Wi-Fi needed on site
- Internal temperature + humidity sensor, −30 to +70 °C and 0–100 %RH
- Vayu Pro adds an external temperature probe on a 3 m cable, −100 to +70 °C
- 5000 mAh rechargeable battery with USB Type-C charging
- ±0.5 °C and ±2 %RH accuracy
Specifications
Vayu Specifications
Each variant side by side, followed by the specifications shared by every Prithvi logger.
Swipe sideways to see every variant.
| Specification | Vayu | Vayu Pro |
|---|---|---|
| Measures | Internal temperature + RH | Internal temperature + RH, plus external temperature probe |
| Temperature range | −30 to +70 °C | Internal −30 to +70 °C; external −100 to +70 °C |
| Humidity range | 0–100 %RH | 0–100 %RH |
| Sensor | Internal | Internal + external probe |
| Probe / cable | — | 3 m external probe |
| Battery | 5000 mAh | 5000 mAh |
| Common to all variants | ||
| Accuracy | ±0.5 °C (±2 %RH on RH models) | |
| Resolution | 0.1 °C (0.1 %RH) | |
| Storage | Up to 1,00,000 records | |
| Logging interval | 1–60 min (configurable) | |
| Cloud sync interval | 1–60 min (configurable) | |
| Battery life | About 3 months at a 10-minute logging interval | |
| Charging | Universal USB Type-C; rechargeable Li-ion battery | |
| Connectivity | Wi-Fi, plus offline data download via PC software. GSM and LoRa versions available on request. | |
Loggers can be calibrated by our parent lab through our Calibration service.
Applications
Where Vayu Is Used
Industries where we recommend this series, and what it typically monitors there.
Vaccine & Cold Chain
- Vaccine refrigerators
- Cold rooms
- Reefer trucks and containers
- Last-mile delivery
Logistics & Warehousing
- Temperature-controlled warehouses
- Distribution centres
- In-transit consignments
Monitoring
Cloud Monitoring Dashboard & Mobile Alerts
Every Vayu works with the monitoring dashboard, so readings, alerts and reports are in one place.
- Real-time alerts via email, SMS, mobile app and dashboard
- Multi-level escalation (Level 1 → 2 → 3) if an alert isn't acknowledged
- Alert acknowledgement with root-cause and corrective-action notes
- Role-based user access and a complete audit trail (supports 21 CFR Part 11, GMP and GDP compliance)
- Location hierarchy for multi-site monitoring (organisation → site → room → device)
- Reports as graph, table or both; export to PDF, Excel and CSV
- Calibration and mapping reports stored against each device and room, ready for audits
- Substitute device while a logger is away for calibration, with its data merged back so there are no gaps
- Consignment (in-transit) monitoring with journey reports
- Door-open monitoring and hooter alarms
Accessories
Accessories
Accessory compatibility is confirmed by our team when we prepare your quote.
External Hooter with Door Sensor
Wi-Fi hooter giving instant audible alarms on any excursion. Supports up to 4 door sensors, with an alarm if a door stays open beyond the set time. One hooter can serve multiple loggers. Cable length configurable. 12 V DC adapter, 12 V external hooter. Logs door open/close and excursion events.
Charging Dock
Charges replaceable logger batteries so a charged spare is always ready, minimising downtime.
FAQ
Vayu Questions
Answers to what buyers ask most about this series.
Does Vayu need Wi-Fi?
No. Vayu is SIM-based and sends its data over the mobile network.
What is the difference between Vayu and Vayu Pro?
Vayu Pro adds an external temperature probe on a 3 m cable, rated from −100 to +70 °C, alongside the internal temperature and humidity sensor.
Will Vayu work in my country?
Network compatibility outside India has to be confirmed first. Contact us with your country and mobile operator and we will check before you order.
Which GSM data logger suits a reefer truck or a remote site?
Vayu, which sends its readings over the mobile network and measures temperature and humidity. Vayu Pro adds an external temperature probe on a 3 m cable, rated from −100 to +70 °C. See shipment temperature data logger uses.
What does Vayu cost?
Share your requirement and we will send a clear quote.
Related
Compare with Other Series
- 1 channel
- 2 channels
Rajmudra
2 × temperature, or 2 × temperature + humidity (Pro)
Two-channel WiFi logger for temperature, or temperature and humidity, at two points.
- Range
- −100 to +200 °C · Pro: −30 to +70 °C, 0–100 %RH
- 4 channels
Dhruva
4 × temperature, or 4 × temperature + humidity (Pro)
Four-channel WiFi logger for multi-point temperature or temperature and humidity.
- Range
- −100 to +200 °C · Pro: −30 to +70 °C, 0–100 %RH
Get Solution
Ask About Vayu
Tell us where it will be used and how many you need. We'll confirm the right variant and send you a clear, itemised quote.