3. spot check 4. air conditions of a room 5. any gas pressure system troubleshooting. Easy operation and clear reading are the major features of AR1890. Therefore, it is doubtlessly an indispensable testing tool for HVAC technician, maintenance engineers and science researchers.
3. Buttons Description The meter has six buttons: 1. UNITS 2. DIF 3. HOLD 4. ON/OFF A. REC B. BACKLIGHT 4. Display Description 1. Hold Function 2. Differential mode 3. Primary Data Screen 4. Record Mode 5. MAX/MIN/AVG 6. Low Battery Indicator 7.
5. Resolution And Range of Units Function Range Resolution Function Range Resolution Ozin2 ±32.00 0.01 inH2O ±55.40 0.01 ftH2O ±4.612 0.001 ±2.000 0.001 Mbar ±137.8 cmH2O ±140.6 ±13.79 0.01 Kgcm2 ±0.140 0.001 inHg ±4.072 0.001 ±0.137 0.001 mmHg ±103.4...
6. Operation 1. ON/OFF button: -Press the ON / OFF button to turn on/off manometer. -When turned on, the screen will be displayed for about two seconds and the normal measurement mode will appear afterwards. 2. Clearance button: -If there is no input dierential pressure, instrument will not be cleared by itself. -When manually clearance is needed, press the HOLD button for about five Seconds, -->the screen will show ----it will be cleared later.
7. Error Codes An error message will appear on screen if the meter fails an internal diagnostic test. 1. Err. 1: Pressure value is over the range. 2. Err. 2: Pressure value is below the range. 8. Battery Replacement When the battery power is low, “BAT” will display on the screen to remind you for replacing the 9V battery.