DM4 Dual-Sensor Zero-Drift Digital Micro-Manometer

measures two independent differential pressures over a span of ±5.0 "wc (±1250 Pa),
and with a display resolution of 0.001 "wc (0.1 Pa), and an accuracy of 1% of the measurement.
The zero drift is automatically removed every 10 seconds, and the internal resolution is 0.0001 "wc (0.025 Pa).

The DM4 is a portable dual channel digital micro-manometer with automatic auto-zero every 10 seconds,
and user selectable display units with a resolution of 0.001 "wc or 0.1 Pa over a ±5.0 "wc (±1250 Pa) range.
It is calibrated for differential pressure, and air flow measurement from several types of calibrated fans
including blower door building air leakage, residential duct leakage, and Pitot tubes for velocity measurements.
(click on thumbnail below for larger image)

DM4 Applications:

Calibrated for Infiltec E3 blower door flow and leakage area,

calibrated for Minneapolis Model 3 blower door flow and leakage area,

calibrated for Pitot tube air velocity,

calibrated for Infiltec DL1 duct leakage flow and leakage area, and

calibrated for Infiltec mobile fans for testing the leakage of large buildings.

Other Uses:

HVAC test and balance,
Data logging pressure and flow,
Radon mitigation,
Furnace draft analysis,
Duct leakage testing,
Pressure balancing,
Combustion safety analysis,
Advanced building diagnostics,
Laboratory safety monitoring,
Process monitoring,
Filter condition checks,
Environmental assessments, and
Orifice pressure measurements.

DM4 Dual Digital Micro-Manometer Specifications

Feature	Specifications
Sensors:	2 independent differential pressure transducers with auto zeroing
Pressure Resolution:	Display resolution in the Pascal mode is 0.1 Pa from 0.0 Pa to ±999.9 Pa and 1 Pa from 1000 Pa to ±1250 Pa. Display resolution in the US units mode is 0.001 "wc from 0.000 "wc to ±5.000 "wc. Internal resolution is 0.025 Pa or 0.0001 "wc over the entire ±5.000 "wc (±1250 Pa) range. and this is the resolution of the serial output.
Pressure Range:	Bi-directional: ±5.0 "wc (±1250 Pa). For higher pressures, see the Infiltec DM5.
Keys:	7 function selection keys.
- Device Key:	Select: Manometer, Pitot tube, E3 blower door, DL1 duct tester, G54 mobile fan devices.
- Units Key:	Dual Manometer: Metric (Pa, Pa), U.S. ("wc, "wc), Mixed ("wc, Pa) Pitot flow: Metric (Pa, m/s), U.S. ("wc, f/m), Mixed (Pa, fpm) Infiltec E3 blower door flow: Metric (Pa, m³/h), U.S. ("wc, cfm), Mixed (Pa, cfm) Infiltec E3 blower door ELA (leakage area): Metric (Pa, cm²), U.S. ("wc, in²), Mixed (Pa, in²) Minneapolis Model 3 blower door flow: Metric (Pa, m³/h), U.S. ("wc, cfm), Mixed (Pa, cfm) Minneapolis Model 3 blower door ELA (leakage area): Metric (Pa, cm²), U.S. ("wc, in²), Mixed (Pa, in²) Infiltec DL1 duct tester flow: Metric (Pa, m³/h), U.S. ("wc, cfm), Mixed (Pa, cfm) Infiltec DL1 duct tester ELA (leakage area): Metric (Pa, cm²), U.S. ("wc, in²), Mixed (Pa, in²).
- Time Avg Key:	Select block average of 1 (default), 2, 4, 8, 16, 32 or 64 seconds.
- Low Flow Key:	Dual Manometer: no function Pitot tube flow: no function Infiltec E3 blower door low flow plate: Off, CRF (Can't reach 50 Pa), 7 holes open, 5 open, 3 open, 2 open, 1 open Minneapolis Model 3 blower door low flow rings: Off, CRF (Can't reach 50 Pa), A Ring, B Ring, C Ring Infiltec DL1 duct tester orifice tubes: Off, 16 cm² tube on, 4 cm² tube on, 1 cm² tube on
- Baseline Key:	Resets the zero building pressure for Infiltec E3 or Minneapolis Model 3 blower door calculations.
- Hold Key:	Holds reading on display until pressed again.
- On/Off Key:	Turn power on and off.
Accuracy:	Dual Pressure: ±1% of display measurement or ±1 digit, whichever is greater. Pitot Flow: ±1.5% of measurement or better from 800-6900 fpm (4-35 m/s) Infiltec E3 blower door flow or ELA: ±1.5% of measurement or better Minneapolis Model 3 blower door flow or ELA: ±1.5% of measurement or better Infiltec DL1 duct leakage flow or ELA: ±1.5% of measurement or better
Display Type:	2x16 high contrast LCD with numbers and characters.
Operating Temperature:	32°F to 122°F. (0°C to 50°C)
Storage Temperature:	-4°F to 160°F. (-20°C to 70°C)
Maximum Pressure:	±25 "wc, ±6 kPa or ±0.9 PSI
Low Battery Display:	Current battery voltage is displayed at startup, "lowbat" displayed when voltage is under 7 volts.
Over Range Indicator:	!!MAX!! displayed when pressure is beyond range ±5.000 "wc (±1250 Pa).
Auto Zero:	Pneumatic switches update zero pressure estimates every 10 seconds.
Weight With Battery:	~16 oz. (~455 grams)
Dimensions:	4.0"x7.5"x1.79" (101.6x190.5x45.4 mm).
Battery Life:	Over 100 hours from six AA alkaline batteries.
Operating Medium:	Air or non-corrosive, non-explosive gas.
Pressure Connections:	Two pairs, barbed for 1/8" ID tubing.
Serial Output:	9600-8N0 pseudo RS232 ASCII records at 1 Hz with LF+CR termination ±50000 range, 0.025 Pa resolution, comma separates two channel values
Microprocessor:	Embedded firmware with serial programmable calibration constants.
Custom Firmware:	Infiltec can modify the DM4 firmware with your fan calibration constants.
Optional Accessories:	E3 blower door, DL1 duct tester, Pitot tube, serial cable, 110 VAC or 220 VAC power adaptor.
Accessories Included:	Battery, soft carrying case, tubing, calibration certificate, user manual.
Warranty:	2 years coverage on parts and labor to repair any defects.

These specifications were updated on October 08, 2023, and are subject to change without notice.

For current DM4 prices, see the Infiltec Radon or Blower Door catalogs, or call (540) 943-2776 weekdays 7AM-4PM ET.

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