KT-401P Air Negative Ion Detector

Overview

The KT-401P Air Negative Ion Detector is a compact, handheld electrostatic field-based sensor instrument engineered for rapid, on-site quantification of negative air ion concentration in ambient and localized environments. It operates on the principle of air ion current collection via a polarized electrode system, where incident negative ions induce a measurable microcurrent proportional to ion density—converted and displayed in real time as ions per cubic centimeter (ions/cm³). Designed for field-deployable use rather than laboratory-grade metrology, the KT-401P delivers repeatable relative measurements suitable for qualitative assessment and comparative analysis across diverse settings—including indoor air quality screening, functional textile evaluation, and performance verification of commercial negative ion generators. Its ultra-low-profile form factor (78 × 27 × 9 mm) and dual LR44 battery operation enable continuous portable operation without external power dependency.

Key Features

• 3.5-digit LCD display with automatic range scaling and peak-hold functionality for transient maximum value capture
• Measurement range spanning 1 × 10⁴ to 1999 × 10⁴ ions/cm³, with fixed resolution of 1 × 10⁴ ions/cm³
• Dedicated negative-ion detection mode only—no bipolar or positive-ion capability
• Compact necklace-mountable design optimized for personal exposure monitoring and spot-checking
• Low-power consumption architecture supporting >200 hours of typical operation per battery set
• Robust ABS housing with ESD-resistant surface finish for stable electrostatic performance in dry environments

Sample Compatibility & Compliance

The KT-401P is intended for gaseous-phase measurement of small air ions (mobility range ~0.5–2.0 cm²/V·s) generated by corona discharge, radioactive sources, or photoelectric emission. It is compatible with static and low-velocity airflow conditions (<0.5 m/s), making it suitable for testing near ionizers, HVAC outlets, textile surfaces treated with ion-emitting coatings, and wellness product demonstration setups. While not certified to ISO 16000-23 (indoor air—measurement of air ions) or IEC 61000-4-2 (ESD immunity), the device conforms to general electromagnetic compatibility (EMC) requirements for Class B digital apparatus under GB/T 17626 (Chinese national standard series). It is not intended for regulatory compliance reporting or GLP/GMP-controlled environments requiring traceable calibration.

Software & Data Management

The KT-401P is a standalone, analog-front-end instrument with no embedded memory, Bluetooth, USB, or data logging capabilities. All readings are displayed in real time and retained only during active measurement; no internal storage or export interface is provided. Peak-hold values remain visible until manually reset via the dedicated function button. For documentation purposes, users must manually record observed values or integrate the unit into third-party imaging workflows (e.g., smartphone screen capture synchronized with environmental annotations). Calibration is factory-set and non-user-adjustable; periodic verification against a reference ion counter (e.g., AIRCOM AIC-2 or AlphaLab Air Ion Counter) is recommended annually for critical applications.

Applications

• Verification of output stability and spatial decay profiles from consumer-grade negative ion generators
• Comparative screening of ion-emitting fabrics, paints, ceramics, and polymer composites under controlled humidity conditions
• Educational demonstrations of atmospheric ion physics and electrostatic phenomena in university physics labs
• Indoor environmental health assessments—particularly in wellness centers, spas, and post-renovation dwellings
• Pre-deployment field checks prior to installing fixed-network ion monitoring systems

FAQ

Does the KT-401P measure positive ions or only negative ions?
It measures negative ions exclusively. The internal electrode bias and signal processing chain are configured for anion detection only.
Can this instrument be calibrated by the user?
No. Calibration is performed at the factory using a reference ion source. No user-accessible calibration trimmers or software routines are included.
Is the KT-401P suitable for outdoor use in rain or high humidity?
No. It is rated for indoor or sheltered use only. Relative humidity above 70% RH may cause condensation on the sensor aperture and lead to unstable readings.
What is the expected battery life under normal usage?
With two fresh LR44 cells, typical continuous operation exceeds 200 hours. Battery life decreases significantly below 0°C or above 40°C ambient temperature.
Does the device comply with FDA, CE, or RoHS directives?
It carries RoHS 2011/65/EU compliance marking for restricted substances. It does not bear CE marking for EMC or LVD, nor is it FDA-regulated, as it is not a medical device.