RenKe RS-YS-GPRS-Y-LY GPRS-Based Temperature and Humidity Transmitter with Data Logging and Bluetooth Printing

Overview

The RenKe RS-YS-GPRS-Y-LY is a rugged, industrial-grade temperature and humidity transmitter and data logger engineered for continuous environmental monitoring in mobile and remote deployment scenarios. It operates on the principle of capacitive sensing using a certified Swiss-origin humidity and thermistor-based temperature measurement module, delivering traceable accuracy under varying ambient conditions. Unlike conventional wired transmitters, this device leverages cellular GPRS (and optional 4G LTE) connectivity to transmit time-stamped sensor data—up to four independent temperature/humidity channels plus one digital input—to cloud-based platforms without local infrastructure. Its embedded microcontroller supports autonomous operation during network outages, storing up to 65,000 records locally and resuming transmission upon reconnection—a critical capability for cold chain logistics, pharmaceutical transport, and unattended field installations. Designed for compliance with ISO 17025-aligned environmental validation workflows, it supports configurable alarm thresholds, audit-ready logging intervals, and GLP-compatible data integrity features including timestamped event flags and parameter change logs.

Key Features

• Swiss-made capacitive humidity sensor and NTC temperature probe with long-term stability: ≤1 %RH/year and ≤0.1 °C/year
• GPRS/GSM communication via China Mobile or China Unicom SIM cards; optional 4G LTE support for enhanced throughput and latency control
• Configurable data acquisition frequency (2 s minimum) and upload interval (5 s to 10,000 s)
• On-device LCD display with Chinese interface; password-protected calibration for temperature (±0.4 °C @ 25 °C) and humidity (±2 %RH @ 25 °C, 5–95 %RH)
• Integrated buzzer and optional external sound-light alarm output for real-time over-limit notification
• One digital input channel supporting door magnetic switches or dry-contact signals
• Bluetooth-enabled thermal printer interface for on-site report generation (up to 4-column print layout)
• Dual power architecture: wide-range DC 10–30 V input with internal rechargeable backup battery (≥48 h runtime)
• Local storage with user-defined logging cycle (1 min to 24 h); automatic overflow overwrite protection
• SMS-based configuration and status query—supports bilingual (Chinese/English) command syntax

Sample Compatibility & Compliance

The RS-YS-GPRS-Y-LY is suitable for monitoring air, enclosed cabin environments, refrigerated containers, pharmaceutical packaging zones, and HVAC ducts. Its probe operating range (−40 °C to +120 °C, default −40 °C to +80 °C) and housing IP rating (IEC 60529 IP54 typical) ensure reliable performance in demanding transport and warehouse applications. While not certified as a primary metrology standard, its A-grade accuracy meets requirements for routine verification per ISO 14644-1 (cleanrooms), WHO TRS 961 Annex 9 (cold chain), and USP <1079> (good storage and distribution practices). The device supports time-synchronized data export in CSV format, enabling traceability in FDA 21 CFR Part 11-compliant environments when deployed with validated cloud platforms (e.g., RenKe RS-RJ-K software or third-party MQTT brokers).

Software & Data Management

Data is natively compatible with RenKe’s free web-based environmental monitoring cloud platform and the RS-RJ-K desktop application, both supporting multi-user access control, role-based dashboards, and customizable alert rules. All uploaded records include UTC timestamps, sensor ID tags, and metadata such as battery voltage and signal strength. The system maintains immutable audit trails for configuration changes and alarm events. For integration into enterprise SCADA or MES systems, RESTful API endpoints and Modbus TCP gateways are available upon request. Local data retrieval is supported via USB-C or Bluetooth export, ensuring offline verification capability without dependency on network availability.

Applications

• Pharmaceutical cold chain validation and real-time shipment monitoring (e.g., vaccine transport vehicles)
• Warehouse and cold room environmental qualification per EU GDP Annex 9 and ICH Q5C
• Industrial process air quality supervision in food processing, electronics manufacturing, and printing facilities
• Energy management in smart buildings—tracking HVAC efficiency and occupancy-correlated thermal load
• Power substation cabinet environmental surveillance (temperature/humidity-induced corrosion prevention)
• Calibration laboratory auxiliary monitoring for stability chamber cross-checking

FAQ

What cellular networks does the device support?
It operates on China Mobile and China Unicom 2G/3G GPRS networks by default; 4G LTE support (including China Telecom) is available as an optional firmware upgrade.
Can the device function without a SIM card?
Yes—it will continue local logging and display functions, but GPRS transmission, SMS alerts, and cloud synchronization require an active SIM card with data service.
Is the Bluetooth printer interface compatible with standard Android/iOS thermal printers?
No—the built-in Bluetooth module is designed exclusively for RenKe-branded portable thermal printers; generic BLE printers are not supported.
How is data integrity ensured during intermittent network coverage?
The device implements store-and-forward logic with CRC-16 checksum validation for each stored record; transmission resumes from the last acknowledged packet after recovery.
Does the unit support NIST-traceable calibration certificates?
Factory calibration reports are provided; however, full NIST-traceable certification requires third-party accredited labs and is not included in standard delivery.