USER GUIDE Heavy Duty Differential Pressure Manometer Model HD750 99 Washington Street Melrose, MA 02176 Phone 781-665-1400 Toll Free 1-800-517-8431 Visit us at www.TestEquipmentDepot.
Introduction Congratulations on your purchase of the Extech Manometer Model HD750. This device measures gauge and differential pressure in the range of ±5.000 psi. The HD750 offers eleven (11) units of measure (user selectable by front panel pushbutton) and has a differential input that uses convenient quick‐disconnect fittings. Advanced features include DATA HOLD, MIN‐MAX‐AVG RECORD mode, ZERO/OFFSET, AUTO POWER OFF, and USB PC interface.
Display 1. USB data output active 2. Differential Pressure Mode 3. Data Hold Mode 4. Primary display 5. Record Mode 6. MAX/MIN/AVG indicators 7. Low Battery Indicator 8. Pressure unit of measure 9. Elapsed Timer 3 HD750-EU-EN V1.
Basic Operation Meter Power The HD750 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).
Zero Adjust and Offset function The unit must be kept in the upright position when ZEROING or when taking measurements. To ZERO the meter: Before use and without fittings attached to the meter, press and hold the HOLD button for 3 seconds or until the display shows all zeroes. To OFFSET meter readings: Press the DIF button while taking a measurement. Subsequent readings will represent the difference between the current measurement and the measurement that was on the display when the DIF button was pressed.
Specifications General Specifications Display Units of Measure Accuracy Repeatability Linearity/Hysteresis Combined Accuracy 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 BAR, mBAR, psi, kg/cm2, mm Hg, inches Hg, kPa, feet H2O, inches 2 H2O, cm H2O, and oz in ±0.3%FS (@ 25°C) ±0.
Range Specifications Range/Units (Max.) ± 0.344bar ± 344.7mbar ± 5.000psi ± 0.351Kg/cm2 ± 258.5 mm Hg ± 10.18 inches Hg ± 34.47kPa ± 11.53feet H2O ± 138.3inches H2O ± 351.5cm H2O ± 80.00oz in2 Resolution 0.001 0.1 0.001 0.001 0.1 0.01 0.01 0.01 0.1 0.1 0.01 Warning: Pressure inputs of 10 psi or higher will damage the instrument. Do not apply pressure higher than the maximum pressure listed in the specification table 7 HD750-EU-EN V1.
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.
