HM-H7 High Negative Pressure Air Sampler

Product Introduction

The HM-H7 is a flagship high negative pressure dual constant-flow air sampler manufactured by HM Instruments, engineered for demanding air quality monitoring applications in mining, heavy industry, and high-altitude environments. The instrument features dual independent constant-flow sampling channels that maintain stable flow rates even under extreme negative pressure conditions, ensuring reliable particulate collection when conventional samplers lose accuracy. With a particulate sampling flow range of 10 to 130 L/min at ±2.0% accuracy, the HM-H7 captures TSP, PM10, and PM2.5 samples in compliance with HJ 93-2026, HJ/T 374-2007, and JJG 943-2011 standards. The pre-gauge pressure range of -35 to 35 kPa and atmospheric pressure range of 50 to 110 kPa enable operation at high altitudes and in deep mine shafts where air density and pressure deviate significantly from standard conditions. The sampling timer supports intervals from 1 minute to 99 hours 59 minutes, accommodating both short-term grab samples and extended 24-hour compliance monitoring. Powered by AC 220V ±10% 50Hz or DC 29.4V/5A external battery, the HM-H7 weighs approximately 4.0 kg and measures 165 × 330 × 275 mm, making it field-portable while delivering industrial-grade performance. At $1,200, it represents the top-tier configuration in HM Instruments' air sampler lineup.

Applications

• Mine and tunnel air quality monitoring — particulate and gas sampling in underground mining operations

• High-altitude environmental monitoring — air quality assessment in plateau and alpine regions

• Industrial occupational health — workplace airborne particulate and contaminant sampling

• Emergency response monitoring — rapid deployment for air quality assessment after industrial incidents

• Environmental compliance — routine TSP, PM10, and PM2.5 monitoring per national standards

• Heavy industry emission sampling — steel, cement, and chemical plant perimeter monitoring

• Scientific research — atmospheric aerosol collection for environmental and climate studies

Features

1. High negative pressure dual constant-flow channels — maintains stable sampling flow under extreme negative pressure conditions where standard samplers fail.

2. Particulate sampling flow range 10 to 130 L/min with accuracy better than ±2.0% — compliant with HJ 93-2026 and HJ/T 374-2007 for TSP, PM10, and PM2.5 monitoring.

3. Dual independent sampling channels — simultaneous gas and particulate sampling, or dual-channel particulate sampling with separate flow control.

4. Flow stability better than ±2.0% — automatic compensation for filter loading and pressure variations ensures consistent sample volume accuracy.

5. Pre-gauge pressure range -35 to 35 kPa — wide-range pressure sensing enables operation in deep mines and pressurized environments.

6. Atmospheric pressure range 50 to 110 kPa — automatic barometric compensation for high-altitude deployment up to approximately 5,000 meters.

7. Sampling time from 1 minute to 99 hours 59 minutes — supports both short-term spot checks and extended 24-hour compliance sampling.

8. AC/DC dual power supply (AC 220V ±10% 50Hz or DC 29.4V/5A) — flexible field and stationary operation in locations with unreliable mains power.

9. Power consumption below 100W — energy-efficient design compatible with battery and solar power systems for remote deployment.

10. Noise level below 60 dB(A) — quiet operation suitable for indoor and residential area monitoring.

11. Compact dimensions (165 × 330 × 275 mm) and approximately 4.0 kg — portable form factor for field transport in rugged terrain.

12. Compliance with HJ 93-2026, HJ/T 374-2007, HJ/T 375-2007, and JJG 943-2011 — full regulatory coverage for environmental and occupational monitoring.

Main Parameters

Technical Parameters

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