Product Description
Series HM35 Ultra-Precision Digital Differential Pressure Manometer – 0–28″ w.c., Model HM3531DLC100
The Series HM35 ultra-precision digital differential pressure manometer is engineered for laboratories, industrial hygiene programs, and HVAC commissioning teams that require maximum low-pressure accuracy with traceable documentation. Covering a 0–28 inches-of-water-column range with a ±0.05% full-scale accuracy tier, this model supports absolute, differential, and gauge pressure modes while capturing system behavior through integrated data logging.
Each unit ships with a calibration certificate, allowing it to function as a dependable secondary calibration reference for airflow systems, pressure transmitters, regulators, and controlled-environment verification.
Low-Pressure Range & Instrument Specifications
• Pressure Range: 0–28″ w.c.
• Accuracy Tier: ±0.05% FS + 1 digit (per order code)
• Media Compatibility: Air and compatible gases
• Wetted Materials: 18/8 stainless steel
• Display: Graphical backlit LCD (128 × 64)
• Memory: 10,742 readings
• Logging Interval: 1 second to 24 hours or manual
• Power: (3) AA batteries or 6–9 VDC external
• Ingress Protection: IP54 / NEMA 3
• Pressure Connections: 4/6 mm hose or 1/8″ NPT
• Approvals: CE
Built-In Data Logging & Graphical Display
This HM35 manometer records more than 10,700 pressure readings, enabling technicians to document duct static pressure, room pressurization, filter loading, and ventilation performance for compliance programs. Data transfers easily to a PC through the infrared interface.
The large graphical LCD displays real-time pressure trends, peak values, and valleys — ideal for HVAC diagnostics, cleanroom testing, containment verification, and laboratory airflow surveys.
Why Professionals Specify the HM35 Series
✔ Ultra-precision ±0.05% FS accuracy tier
✔ Digital differential pressure measurement
✔ Onboard data logging with PC download
✔ Secondary calibration reference
✔ Graphical trend visualization
✔ IP54 enclosure for lab or field use
✔ Battery or external power operation
