HACH Adcon TR1 Air Temperature and Humidity Sensor

Overview

The HACH Adcon TR1 Air Temperature and Humidity Sensor is a precision-engineered, dual-parameter environmental monitoring device designed for long-term deployment in demanding outdoor and industrial settings. Based on capacitive relative humidity sensing with HC01 hydrophobic protective coating and a high-stability Pt1000 (DIN Class A) resistance temperature detector, the TR1 delivers traceable, repeatable measurements under wide thermal and contaminant exposure conditions. Its measurement principle relies on dielectric constant variation of a polymer-based capacitive element for RH detection and four-wire platinum resistance change for temperature—both referenced to NIST-traceable calibration protocols. The sensor outputs two independent, ratiometric 0–2.5 VDC analog signals—one for temperature and one for relative humidity—enabling direct integration into SCADA systems, data loggers (e.g., Adcon Telemetry platforms), and PLC-based control architectures without signal conditioning. Engineered for minimal drift and maximum robustness, the TR1 is widely deployed in meteorological networks, agricultural microclimate stations, HVAC commissioning, and environmental compliance monitoring where continuous, low-maintenance operation over multi-year intervals is required.

Key Features

• Hermetically sealed Tecapet® cylindrical housing—superior corrosion resistance and mechanical durability compared to aluminum or stainless-steel alternatives, especially in coastal, agricultural, or ammonia-rich environments
• Integrated stainless-steel mesh filter cap (IP65-rated) providing particulate, insect, and dust ingress protection; optional sintered metal end cap available for enhanced chemical resistance (e.g., NH₃, H₂S, or fine aerosol mitigation)
• Low-power design (<1.5 mA typical draw) enabling extended battery or solar-powered operation in remote telemetry applications
• Dual analog output (0–2.5 VDC) with galvanically isolated channels—eliminates crosstalk and simplifies wiring in mixed-signal measurement systems
• Wide operating range (−40 °C to +60 °C) validated per IEC 60068-2 environmental stress testing standards
• No field recalibration required—factory-calibrated with documented uncertainty budgets compliant with ISO/IEC 17025-accredited procedures

Sample Compatibility & Compliance

The TR1 is intended for ambient air measurement only and is not suitable for condensing, corrosive gas streams, or pressurized duct applications without custom mounting adapters. It complies with EMC Directive 2014/30/EU per EN 61326-2-3 for industrial environments and meets RoHS 2011/65/EU material restrictions. While not intrinsically safe certified, its low-energy design supports use in non-hazardous area classifications (Zone 2 / Class I, Division 2). For regulatory reporting contexts—including EPA Method 205-compliant ambient air quality monitoring or EU Ambient Air Quality Directive (2008/50/EC) supporting instrumentation—the TR1’s documented accuracy, stability, and traceable calibration support data defensibility during GLP/GMP audits or third-party verification.

Software & Data Management

The TR1 operates as a stand-alone analog transducer and does not embed firmware or require driver installation. When interfaced with Adcon’s ADELIS or TELEMAC data loggers, it supports automated timestamped logging, linearization via built-in calibration polynomials, and alarm thresholds configurable via Adcon Configuration Studio (v5.2+). All raw voltage outputs are compatible with Modbus RTU (via optional signal conditioner), SDI-12, or analog input modules conforming to IEC 61000-4-5 surge immunity requirements. Audit trails—including sensor ID, calibration date, and firmware revision of host logger—are retained in accordance with FDA 21 CFR Part 11 principles when used within validated Adcon telemetry ecosystems.

Applications

• Real-time microclimate monitoring in greenhouses, vineyards, and controlled-environment agriculture (CEA)
• Baseline ambient condition logging for HVAC system performance validation (ASHRAE Guideline 12–2020)
• Environmental compliance tracking in landfill gas monitoring stations and wastewater treatment headworks
• Long-term climatological data collection for ISO 14064 greenhouse gas inventory support
• Reference-grade sensor pairing in multi-node wireless sensor networks (WSNs) for spatial interpolation modeling

FAQ

Is the TR1 suitable for indoor HVAC duct installation?
No—the TR1 is rated for free-air ambient measurement only. Duct mounting requires an isokinetic sampling probe and thermal stabilization sleeve to avoid radiant error and airflow-induced cooling effects.
Can the TR1 be calibrated in-field using portable reference standards?
Field recalibration is not supported. Its stability specification (<1 %RH/year) assumes factory calibration; verification against NIST-traceable hygrometers (e.g., Rotronic HC2A-S) is recommended annually.
What is the expected service life under continuous outdoor exposure?
Based on accelerated aging tests per ISO 4892-3, the Tecapet® housing and HC01-coated sensor exhibit >7 years functional integrity in temperate zones and >5 years in high-UV, high-salinity coastal deployments.
Does the 0–2.5 VDC output require external excitation or load matching?
No—the TR1 includes internal regulated excitation and buffered voltage output; it drives loads ≥10 kΩ without signal degradation and is compatible with standard 12-bit or higher analog-to-digital converters.
Is there a digital communication variant of the TR1?
No—Adcon offers the TR2 (RS-485 Modbus RTU) and TR3 (SDI-12) as digital alternatives; the TR1 remains purpose-built for analog-integration legacy systems requiring minimal power and wiring complexity.