Mengshen 1890 Handheld Manometer Instruction Manual

Mengshen 1890 Handheld Manometer Instruction Manual

Introduction
The meter can measure the differential pressure/positive pressure/negative pressure, there are 11 uints can be selectable, as inH2O,psi, bar, mbar ,kPa, inHg, mmHg,ozin,ftH2O,cmH2O,kgcm, Equipped with a simple hose connection device, it is used for testing Ventilation and air conditioning system, spot check, clean room, or any gas pressure system troubleshooting. Easy operation and clear reading. it is an indispensable testing tool for HVAC technician, maintenance enginers and science researchers.

Meter Diagram

The meter has six buttons.

1.  UNITS
2.  DIF
3.  HOLD
4.  ON/OFF
   A. REC
   B. BACKLIGHT

Display Description

1. Hold Function
2. Differential Mode
3. Primary Data Screen
4. Record Mode
5. MAX/MIN/AVG
6. Low Battery Indicator
7. Pressure Unit Indicator
8. Relative Time Clock

Function| Range| Resolution| Function| Range| Resolution
---|---|---|---|---|---
inH2O| ± 55.40| 0.01| Ozin2| ±32.00| 0.01
Psi| ±2.000| 0.01| ftH2O| +4.612| 0.001
Mbar| ± 137.8| 0.001| cmH2O| 140.6| 0.1
kPa| ±13.79| 0.1| Kgcm2±0.140| 2±0.140| 0,001.
inHg| ±4.0720 4.072| 0.01| Bar| ±0.137| 0.001
mmHg ±| 103.4| 0.1| | |
Display| Dual LCD
---|---
Accuracy| +0.3%FSO(25°C)
Repeatability| ±0.2%(Max+/-0.5%FSO)
Linearity/Hysteresis| ±0.29% FSO
Maximum Pressure| 10psi (HT-1890, HT-1890B, HT-1890C)
20psi (HT-1891)
100psi (HT-1892.HT-1893)
150psi (HT-1895)
Response Time| 0.5Seconds typical
Low Battery Indicator| Yes
Under Range Indicator| Err.1
Operating Conditions| Err.2
Storage Conditions| 32°F to 122°F(0 to 50°C)
Storage Conditions| 14°F to 140F°(-1 to 60°C)
Power Supply| 1X 9V Battery (included) or External 9VDC
Standard Accessories| Pouch & Tubing

Operation

1. ON/OFF button:
   to turn on or off the power
   Press the ON/OFF button to turn on the power of manometer. When turned on, the screen will be displayed for about two seconds and then will display the normal measurement mode.

2. Clearance button:
   When turned on, if there is no input differential pressure, instrument will not be cleared by itself. Necessarily need to be manually cleared, press the HOLD button for about 5 seconds,
   The screen will show it will be cleared later.

3. UNITS button:
   intermittently press the UNITS button there will revolve various units at the bottom of the screen. These units are as follows: bar, mmHg, Ozin2, Kgcm2, psi, infH20, Kpa, ftH2O, inflg,  cmf420,mbar,

4. DIF button:
   the pressure value when pressing the DIF button subtracting the pressure value before pressing.

5. HOLD button:
   pressing the HOLD button will keep the current measured result. Pressing once more will lift the hold function.

6. REC button
   this button is on the side of the instrument, intermittently press this button will display the maximum, minimum, average result in process of recording measuring. Meanwhile the other function buttons are locked and can not operated. Long pressing the REC button for about 5 seconds and it will quit recording mode.

7. Backlit button:
   pressing the backlight button and the backlight will turn on. In dark environment can use this function. Press the backlight button again to turn off the backlight.

8. Automatic power-off function:
   it will automatically power off if instrument not work for more than 25 minutes. This can extend the battery life. If do not want to turn off the power, press hold button first, then press the ON/OFF button to start.. LCD will show “ON” to close the function of automatic power-off. Error Codes
   retro message will appear on the display 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.

Battery Replacement
When the battery power falls low, “BAT” will appear on the LCD. Replace the 9V battery

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