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 diagnostics, and calibration laboratories that require reliable low-pressure measurement with audit-ready documentation. This configuration covers a 0–120 inches-of-water-column range with ±0.20% full-scale accuracy, while supporting absolute, differential, and gauge pressure modes for versatile testing scenarios.
Each instrument includes a calibration certificate, enabling use as a trusted secondary calibration reference when verifying airflow instrumentation, regulators, and ventilation systems.
Pressure Range & Instrument Specifications
• Pressure Range: 0–120″ w.c.
• Accuracy Options (per order code):
– ±0.20% FS + 1 digit (HM3531DLF300)
– ±0.10% FS + 1 digit
– ±0.05% FS + 1 digit
• 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 document duct pressure, filter loading, and room pressurization for compliance programs. Data transfers to a PC through the infrared interface for reporting and calibration records.
The large graphical LCD presents real-time trend plots, peak values, and valleys — ideal for airflow surveys, containment testing, fume hood balancing, 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
✔ ±0.20% FS low-pressure 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
