MKN CENTER 315 Pocket Digital Thermo-Hygrometer

Overview

The MKN CENTER 315 Pocket Digital Thermo-Hygrometer is a compact, handheld environmental monitoring instrument engineered for reliable, real-time measurement of ambient temperature and relative humidity (RH). Designed around capacitive humidity sensing and precision NTC thermistor technology, the device delivers stable readings across laboratory workbenches, cleanroom pass-throughs, HVAC maintenance points, storage facilities, and field-based quality assurance inspections. Its dual-line LCD display enables simultaneous viewing of both parameters without manual mode switching—critical for rapid environmental verification in time-sensitive workflows. The unit complies with fundamental metrological principles outlined in ISO 9001–compatible calibration practices and supports traceable verification when used with optional external humidity calibration sources (e.g., saturated salt solutions or certified portable calibrators).

Key Features

• True dual-parameter readout: Independent high-contrast LCD simultaneously displays temperature (°C/°F) and relative humidity (%RH) with 0.1-unit resolution
• Rapid thermal and hygric response: Achieves 90% step response in ≤30 seconds under standard airflow conditions (1 m/s), minimizing waiting time during sequential spot checks
• Intelligent power management: Auto-power-off activates after 15 minutes of inactivity; low-battery indicator provides advance warning prior to voltage drop affecting sensor stability
• Functional utility suite: Includes REL (relative deviation), HOLD (data freeze), MAX/MIN tracking with timestamped extremum recall, and user-selectable °C/°F units
• Ruggedized ergonomic housing: ABS+PC polymer casing rated IP42 for dust resistance and limited moisture ingress protection; optimized grip geometry for single-hand operation in gloved environments
• Calibration-ready architecture: Sensor module designed for periodic field verification using NIST-traceable reference standards; no internal potentiometers—calibration adjustments performed via software-assisted offset correction protocols

Sample Compatibility & Compliance

The CENTER 315 is intended for non-invasive ambient air measurement only. It is not suitable for direct immersion, high-velocity duct flow, corrosive atmospheres (e.g., Cl₂, NH₃ >1 ppm), or explosive environments. Its operational envelope aligns with ANSI/ASHRAE Standard 55–2023 thermal comfort guidelines and supports preliminary environmental qualification per ISO 14644–1 Class 8 cleanroom monitoring requirements. While not certified for regulatory submission, its performance characteristics meet baseline expectations for internal QA/QC documentation under GLP frameworks when deployed within validated usage protocols. Device firmware and hardware design adhere to IEC 61000–4 electromagnetic compatibility standards for industrial-grade portable instrumentation.

Software & Data Management

The CENTER 315 operates as a standalone instrument with no embedded Bluetooth, USB, or data-logging capability. All measurements are displayed and retained in volatile memory only during active use. For audit-compliant recordkeeping, users must manually transcribe values into LIMS, ELN, or spreadsheet systems. To support traceability, the unit’s serial number (engraved on rear housing) should be logged alongside each measurement session. Optional third-party humidity calibration kits—including pre-formulated salt standards (LiCl, MgCl₂, NaCl) and temperature-controlled validation chambers—enable routine accuracy verification aligned with ISO/IEC 17025 clause 5.9 requirements.

Applications

• Pre-shipment environmental screening of pharmaceutical secondary packaging in distribution centers
• Baseline mapping of temperature/humidity gradients across museum artifact storage vaults
• Quick verification of incubator or stability chamber ambient drift prior to formal qualification runs
• Field assessment of HVAC system output consistency during commissioning and recommissioning
• Educational laboratory demonstrations of psychrometric relationships and dew point estimation
• Supporting ISO 13485 clause 7.5.11 environmental control documentation for medical device manufacturing zones

FAQ

Does the CENTER 315 support data export or PC connectivity?
No. This is a self-contained display instrument with no digital interface, memory storage, or wireless transmission capability.
Can it be calibrated in-house without sending it to a lab?
Yes—using certified humidity generation methods (e.g., saturated salt standards) and reference thermometers meeting ISO 17025 accreditation, provided documented procedures and uncertainty budgets are maintained.
Is the sensor replaceable by the end user?
No. The humidity and temperature sensing elements are integrated into a sealed, factory-aligned module; replacement requires return-to-factory service.
What is the recommended recalibration interval?
Annually under normal use; every six months in high-cycle or high-contamination environments, per ISO/IEC 17025 clause 7.7.1 guidance.
Does it meet FDA 21 CFR Part 11 requirements?
No—it lacks electronic audit trails, user authentication, or secure data handling features required for regulated electronic records.