Product Description
Ultra-Precision Digital Differential Pressure Manometer – 0–120″ w.c.
The Series HM35 ultra-precision digital differential pressure manometer is engineered for industrial hygiene programs, HVAC commissioning, and calibration laboratories requiring maximum low-pressure accuracy with traceable documentation. This configuration spans a 0–120 inches-of-water-column range with ±0.05% full-scale accuracy, while supporting absolute, differential, and gauge pressure modes for demanding verification tasks.
Each instrument includes a calibration certificate, enabling it to function as a trusted secondary calibration reference for airflow instrumentation, regulators, pressure transmitters, and ventilation systems.
Pressure Range & Instrument Specifications
• Pressure Range: 0–120″ w.c.
• Accuracy Options (per order code):
– ±0.20% FS + 1 digit
– ±0.10% FS + 1 digit
– ±0.05% FS + 1 digit (HM3531DLF100)
• Media Compatibility: Air and compatible gases
• Wetted Materials: 18/8 stainless steel
• Operating Temperature: 32 to 122°F (0 to 50°C)
• Storage Temperature: –4 to 140°F (–20 to 60°C)
• Humidity: 95% RH max, non-condensing
• Display: Graphical backlit LCD, 128 × 64 resolution
• Memory Capacity: 10,742 readings
• Recording Interval: 1 second to 24 hours or manual
• Power Supply: (3) AA batteries or 6–9 VDC external
• Current Draw: 25 mA (without backlight, IR, or buzzer)
• Ingress Protection: IP54 / NEMA 3
• Weight: 10.5 oz (270 g)
• Pressure Connections: 4/6 mm hose or 1/8″ NPT
• Approvals: CE
Integrated Data Logging & Graphical Trend Display
With onboard memory for more than 10,700 readings, this HM35 manometer allows hygienists and technicians to capture duct pressure, room pressurization, and filter loading with audit-ready records. Data downloads easily to a PC through the infrared interface.
The large graphical LCD presents live trend curves, peak values, and valleys — ideal for fume-hood balance checks, containment testing, ventilation surveys, and laboratory diagnostics.
Applications
• Industrial hygiene monitoring
• HVAC and ventilation testing
• Calibration laboratories
• Room pressurization verification
• Duct diagnostics
• Pressure transmitter validation
• QA / compliance programs
Why Professionals Specify the HM35 Series
✔ ±0.05% FS ultra-precision accuracy tier
✔ Inches-of-water-column measurement
✔ Absolute, differential, and gauge modes
✔ Secondary calibration reference capability
✔ Onboard data logging with PC export
✔ Graphical trend visualization
✔ Stainless steel wetted components
✔ IP54 enclosure
✔ Battery or external power operation
