KANOMAX GTI-115 Handheld Differential Pressure Meter
| Brand | KANOMAX |
|---|---|
| Origin | Japan |
| Model | GTI-115 |
| Pressure Type | Differential |
| Measurement Medium | Air |
| Pressure Range | –2500 to +2500 Pa |
| Accuracy | ±0.5% of reading ±1 Pa |
| Resolution | 0.1 Pa |
| Wind Speed Range | 0.20–60.0 m/s |
| Wind Speed Accuracy | ±1.5% of reading (at 10.0 m/s) |
| Wind Speed Resolution | 0.01 m/s |
| Airflow Range | 0–999999 m³/h |
| Airflow Resolution | 1 m³/h |
| Operating Temperature | 0–60°C (non-condensing) |
| Storage Temperature | –20–70°C (non-condensing) |
| Power Supply | 4 × AA batteries or DC 5 V AC adapter |
| Battery Life | >15 hours |
| Weight (with batteries) | ~360 g |
| Data Storage Capacity | 10,000 records |
| Data Export | USB flash drive |
| Display | Full-color TFT LCD |
Overview
The KANOMAX GTI-115 Handheld Differential Pressure Meter is a precision-engineered instrument designed for high-fidelity differential pressure, air velocity, and volumetric airflow measurements in HVAC commissioning, cleanroom validation, pharmaceutical facility qualification, and industrial process monitoring. Based on piezoresistive silicon pressure sensing technology with temperature-compensated signal conditioning, the GTI-115 delivers stable, repeatable readings across its full –2500 to +2500 Pa differential pressure range. Its integrated microprocessor enables real-time conversion of differential pressure signals—when used with standardized pitot tubes or averaging probes—into calibrated air velocity (m/s) and volumetric airflow (m³/h), conforming to ISO 14644-3, ASHRAE Guideline 12, and ISO 5801 principles for duct and grille testing. The device operates exclusively with gaseous media (air, nitrogen, dry compressed air) and is not rated for liquid or corrosive gas applications.
Key Features
- True differential pressure measurement with dual-port stainless steel pressure ports and zero-stability calibration retention
- Simultaneous real-time display of ΔP (Pa), air velocity (m/s), and volumetric airflow (m³/h) on a 3.5-inch full-color TFT LCD
- High-resolution data acquisition: 0.1 Pa pressure resolution, 0.01 m/s velocity resolution, and 1 m³/h airflow resolution
- Onboard storage for up to 10,000 timestamped measurement records with internal clock synchronization
- Direct USB mass-storage mode for plug-and-play export to USB flash drives—no proprietary software required
- Post-acquisition data review: scrollable history, selective record deletion, and on-device statistical analysis (min/max/mean)
- Low-power architecture supporting >15 hours of continuous operation on four AA alkaline cells; optional DC 5 V AC adapter for benchtop use
- Rugged, ergonomic housing rated IP42 for dust resistance and incidental moisture protection during field deployment
Sample Compatibility & Compliance
The GTI-115 is validated for use with standard pitot-static tubes (e.g., Prandtl-type, S-type), thermal anemometer probes (for comparative verification), and certified averaging duct probes meeting ISO 5801 Annex C specifications. It complies with IEC 61000-4 electromagnetic immunity standards and meets CE marking requirements under the EU Measuring Instruments Directive (MID) for portable pressure measuring devices. While not intrinsically safe, it is suitable for non-hazardous environments per ATEX Zone 2 / Class I, Division 2 guidelines when operated within its specified temperature and humidity limits (0–60°C, non-condensing). Calibration traceability follows JIS Z 8001 and NIST-traceable reference standards; factory calibration certificates include uncertainty budgets per ISO/IEC 17025.
Software & Data Management
Data management is intentionally hardware-native: measurements are stored in CSV-compatible plain-text format directly readable by Excel, MATLAB, or LIMS platforms. Each record includes UTC timestamp (with user-configurable time zone), sensor ID, pressure reading, derived velocity/flow values, and status flags (e.g., “under-range”, “over-range”, “low battery”). No cloud connectivity or vendor lock-in is implemented—eliminating compliance risks associated with remote data transmission in regulated environments (e.g., FDA 21 CFR Part 11, EU GMP Annex 11). Audit trails are preserved via immutable file timestamps and sequential record numbering; manual calibration logs may be appended as metadata files on the same USB drive.
Applications
- HVAC system balancing and TAB (Testing, Adjusting, Balancing) per ASHRAE Standard 111
- Cleanroom differential pressure mapping for ISO 14644-1 classified zones (e.g., between gowning rooms and production suites)
- Filter integrity testing via upstream/downstream pressure drop monitoring during DOP/PAO scanning
- Pharmaceutical isolator and RABS pressure cascade verification per EU GMP Annex 1
- Exhaust hood face velocity validation in laboratories (ANSI/AIHA Z9.5)
- Energy audit workflows requiring simultaneous static pressure and airflow quantification in supply/return ducts
- Academic research in fluid dynamics education where low-range differential pressure correlates with laminar flow regimes
FAQ
What pressure reference does the GTI-115 use?
It measures true differential pressure between two independent ports—no fixed atmospheric or vacuum reference is assumed. Users must connect high- and low-pressure lines explicitly.
Can the GTI-115 measure gauge or absolute pressure?
No. It is exclusively a differential pressure meter. Gauge or absolute measurements require dedicated transducers with sealed or vented reference chambers.
Is calibration required before each use?
Zero calibration is recommended prior to critical measurements, especially after large ambient temperature shifts (>10°C) or mechanical shock. Full span calibration is performed annually or per ISO/IEC 17025 intervals.
Does the device support custom probe coefficients?
Yes—users may input probe-specific K-factors (e.g., for non-standard pitot tube geometries) via the configuration menu to correct velocity calculations.
Are firmware updates available?
Firmware revisions are distributed via KANOMAX’s authorized service centers only; no over-the-air or end-user update capability exists to maintain regulatory integrity.
