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 accurate mid-range low-pressure measurement with audit-ready documentation. This configuration spans a 0–120 inches-of-water-column range with ±0.10% full-scale accuracy, while supporting absolute, differential, and gauge pressure modes for flexible testing.
Each instrument ships with a calibration certificate, enabling use as a dependable secondary calibration reference when validating airflow instruments, 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 (HM3531DLF600)
– ±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 storage for more than 10,700 readings, this HM35 manometer enables hygienists and technicians to document duct pressure, filter loading, room pressurization, and ventilation stability. Results export easily to a PC via the infrared interface for reporting and compliance documentation.
The large graphical LCD shows live trend curves, peak values, and valleys — perfect for airflow surveys, fume-hood balancing, containment testing, and laboratory diagnostics.
Applications
• Industrial hygiene monitoring
• HVAC and ventilation testing
• Calibration laboratories
• Room pressurization verification
• Duct system diagnostics
• Pressure transmitter validation
• QA and compliance programs
Why Professionals Specify the HM35 Series
✔ ±0.10% FS accuracy for low-pressure systems
✔ 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
