Solar Light PMA2170 Precision Thermo-Hygrometer Probe

Overview

The Solar Light PMA2170 is a high-precision, NIST-traceably calibrated thermo-hygrometer probe engineered for simultaneous measurement of ambient relative humidity (RH) and temperature across demanding laboratory, industrial, and controlled-environment applications. Designed exclusively for integration with the Solar Light PMA2100 digital meter, the PMA2170 operates as a smart, self-identifying sensor module—embedding signal processing firmware, unit-conversion algorithms, and calibration metadata directly into its onboard memory chip. This architecture eliminates manual instrument configuration: upon connection to the PMA2100, the probe automatically transmits its unique calibration coefficients and functional parameters, ensuring full interchangeability and metrological traceability without user intervention. The core sensing element employs a temperature-compensated capacitive polymer film, fabricated to stringent tolerances and pre-calibrated at multiple RH/temperature points across its operational range. Its low-hysteresis response, combined with a hydrophobic thin-film filter and robust stainless-steel housing, ensures long-term stability (<1% RH/year drift), resistance to particulate contamination, and minimal self-heating (<100 µW), critical for non-intrusive measurements in thermally sensitive environments.

Key Features

• Smart probe architecture with embedded EEPROM storing calibration data, signal processing logic, and unit conversion routines
• Temperature-compensated capacitive polymer sensor delivering high accuracy (±3% RH from 10–90% RH; ±1 °C temperature) and low hysteresis
• NIST-traceable factory calibration performed at multiple points across the full 0–100% RH and −10 to +60 °C ranges
• Modular design enabling rapid sensor replacement without recalibration or system downtime
• Instant dew point calculation and display in °F, °C, or K—computed in real time using integrated psychrometric algorithms
• Flexible cable options (standard 0.3 m; optional 1.5 m) with industry-standard connector interface compatible with PMA2100 base units
• Robust mechanical construction: 1-inch diameter ergonomic handle, 0.5-inch sensor tip, total length 11 inches, weight 10 oz

Sample Compatibility & Compliance

The PMA2170 is optimized for non-destructive, in-situ monitoring of ambient air conditions in static or low-velocity environments. It is not intended for immersion, high-pressure, or corrosive gas applications. Its sealed sensor assembly and hydrophobic filter make it suitable for cleanrooms (ISO Class 4–5, e.g., 10-class environments requiring ~38% RH), hospital operating suites (targeting 60% RH per ASHRAE Guideline 170), and electronics manufacturing areas where electrostatic discharge (ESD) control mandates strict RH management (typically 30–70% RH). The probe complies with general requirements for environmental monitoring instrumentation under ISO/IEC 17025:2017 (clause 6.4.10 on equipment verification) and supports GLP/GMP-aligned workflows through its inherent traceability and audit-ready calibration records. While not FDA 21 CFR Part 11–certified as a standalone device, its data output—when paired with a validated PMA2100 logging system—can be incorporated into compliant data acquisition protocols when accompanied by appropriate procedural controls.

Software & Data Management

The PMA2170 operates without proprietary software: all measurement computation—including dew point, wet-bulb temperature, and absolute humidity—is performed internally and transmitted digitally to the PMA2100 display unit via a deterministic serial protocol. The PMA2100 supports analog output (0–5 V or 4–20 mA) and RS-232 communication for integration into SCADA, LabVIEW, or custom data logging platforms. Raw sensor outputs are not exposed; instead, fully processed, temperature-compensated values are delivered with consistent 0.1-unit resolution across all supported units (°F, °C, K, %RH). For archival purposes, users may export timestamped readings via the PMA2100’s data port using third-party terminal emulators or OEM-supplied utilities—enabling CSV export for traceability documentation, trend analysis, or compliance reporting. No cloud connectivity or firmware updates are required; calibration integrity is preserved through hardware-based memory storage.

Applications

• Environmental validation of ISO-certified cleanrooms and pharmaceutical manufacturing suites
• Real-time RH and temperature monitoring in semiconductor fabrication and ESD-sensitive assembly lines
• Reference-grade humidity verification for HVAC commissioning and thermal chamber qualification (e.g., oven, incubator, stability chambers)
• Dew point monitoring in compressed air systems and inert gas purge environments
• Material conditioning studies for hygroscopic substrates including paper, adhesives, textiles, and composite laminates
• Educational demonstrations of psychrometrics, thermal comfort indices (ASHRAE 55), and moisture migration phenomena
• Supporting infrared (IR) radiometry setups where ambient humidity affects atmospheric transmission correction models

FAQ

Is the PMA2170 compatible with instruments other than the PMA2100?
No—the probe’s smart interface, automatic configuration handshake, and digital signal encoding are specifically designed for use with the Solar Light PMA2100 meter only. It is not electrically or protocol-compatible with generic data loggers or third-party controllers.

Does the probe require periodic recalibration?
While the sensor exhibits excellent long-term stability (<1% RH/year), annual recalibration against NIST-traceable standards is recommended for applications requiring ISO/IEC 17025 compliance or regulatory audit readiness. Field verification using saturated salt solutions is permissible for interim checks.

Can the sensor tip be cleaned if contaminated?
Yes—the hydrophobic membrane filter allows gentle cleaning with deionized water and lint-free wipes. Harsh solvents, abrasives, or ultrasonic cleaning must be avoided to preserve polymer film integrity and calibration fidelity.

What is the maximum allowable air velocity during measurement?
For optimal accuracy, airflow across the sensor tip should remain below 1 m/s. Higher velocities may induce evaporative cooling effects and transient RH errors; use of a radiation shield or aspirated enclosure is advised in ventilated environments.

Is the probe rated for outdoor use?
The PMA2170 is rated for indoor and sheltered ambient environments only. It lacks IP65 or higher ingress protection and is not designed for direct exposure to rain, condensation, or UV degradation.