User Guide Heavy Duty Differential Pressure Manometer Model HD755 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.com Back to the Extech HD755 Product Page Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 FAX 781.665.0780 - TestEquipmentDepot.
Meter Description 1. P2 input 2. AC adaptor jack 3. P1 Input 4. LCD Display – Indicates the measurement data, unit of measure, elapsed timer, and function symbols as described in this manual 5. USB PC interface jack (3.5mm) – For use with data acquisition software 6. UNIT button – Press to select the unit of measure 7. DIF button– Press to display differential pressure. Also used to OFFSET the displayed readings. 8. RECORD button– Press to access the MIN/MAX/AVG recording mode 9.
Basic Operation Meter Power The HD755 uses a 9V battery for power. If the meter does not switch on when the POWER button is pressed or if the display shows BAT, replace the battery. When the POWER buttons is pressed, the meter performs a short self-test and reverts to the settings in place when the meter was last turned off. Automatic Power-off Feature In order to conserve battery life, the meter has an automatic power off feature (after 20 minutes).
MIN-MAX-AVG Record Mode with Elapsed Timer The RECORD function tracks the maximum (MAX), minimum (MIN), and average (AVG) readings with a time stamp. The elapsed timer is displayed on the lower right-hand corner of the LCD and informs the user of the time a MAX or MIN reading was recorded. 1. Press the RECORD button once. The REC indicator will appear on the display and the displayed elapsed timer will start (HH:MM:SS format [hours:minutes:seconds]). 2.
Specifications General Specifications Display Units of Measure Accuracy Repeatability Linearity/Hysteresis Maximum Pressure Response time Input circuit Input Ports Data Hold Sensor Zero / Offset function Sample rate Compatibility Auto Power OFF PC Interface Storage conditions Operating conditions Battery power Battery life Dimensions Weight Four digit LCD with function indicators 2 BAR, mBAR, psi, kg/cm , mm Hg, inches Hg, kPa, feet H2O, 2 inches H2O, cm H2O, and oz in ±0.3%FS + 1d (@ 25°C) ±0.2% to 0.
Battery Replacement When the low battery indicator BAT appears on the display or if the meter does not switch on when the POWER button is pressed, it is necessary to replace the battery. To replace the battery: 1. Open the battery compartment by sliding the meter’s rear panel in the direction of the embossed arrow. 2. Replace the 9V alkaline battery 3. Replace the battery compartment cover. Conversions Useful conversion Factors From To Multiplier in of H2O in of Hg 0.
