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406800    V2.1    11/06 

Operation 

Power 

Press the ON/OFF button to turn power on or off. The meter will perform a short self-test 
when turned on. The meter defaults to the setting used during the last operation. 

 

 

Zero Adjust and Offset 

Before use and without fittings attached to the meter, press the 

HOLD

 button for more than 2 

seconds to zero the meter. The meter will reset and display “

o o o o

” from right to left. “0.0” 

will now be displayed. 

 

If it is desired to offset the meter’s display, press the 

DIF

 button while taking a measurement. 

Subsequent readings will be the difference between the current measurement and the 
measurement that was on the display when the 

DIF

 button was pressed. 

 
 

Data Hold 

Press the HOLD

 

button momentarily to freeze the displayed reading. The '

HOLD

' icon will 

appear on the upper left-hand side of the display. Press the HOLD button again to return to 
normal operation. 
 
 

Record 

The MAX/MIN mode allows the user to view only the highest (

MAX

) or lowest (

MIN

) readings 

with relative time stamp. 

1. Press 

the 

REC

 button once and “

REC

” appears on the display (All other functions 

are locked out except for Power & Backlight). The relative time clock also appears 
in the secondary display and starts counting. 

2. Press 

the 

REC

 button again and “

MAX

” appears on the display. The display is now 

showing the maximum pressure and relative time that it was recorded. 

3. Press 

the 

REC 

button again to display the minimum “

MIN

” reading with the relative 

time. 

4. Press 

the 

REC

 button again to continue recording min/max measurements. 

5. 

To exit the MIN/MAX mode, press the 

REC

 button for 3 seconds to return to normal 

operation. 

 

Backlight Display 

Press the        key to turn on the backlight. It will remain on for 30 seconds. 

 
 

Automatic Power Off 

The meter will automatically shut off after 20 minutes to conserve battery life. To disable Auto 
Power Off, hold down the 

HOLD

 button and turn the meter on. An “

n

” will appear in the 

display indicating that Auto Power Off mode is disabled. The meter will return to normal 
operation when it is turned off.  
 

Unit

 

Press the 

Unit

 button momentarily and the meter will cycle through the 11 available units of 

measure as indicated by the cursor on the bottom of the display. 

Summary of Contents for 406800

Page 1: ...User s Guide Differential Pressure Manometer Model 406800 ...

Page 2: ... 10 18inHg 0 01inHg mmHg 258 5mmHg 0 1mmHg ozin 2 80 00oz in 2 0 01oz in 2 ftH2O 11 53ftH2O 0 01ftH2O cmH2O 350 1cmH2O 0 1cmH2O kgcm 2 0 351kg cm 2 0 001kg cm 2 Display Dual LCD Accuracy 0 3 FS Repeatability 0 2 to 0 5 FS Linearity Hysteresis 0 3 FS Combined Accuracy 1 1 FS 5 to 4psi 4 to 5psi unspecified Connectors Two metal 4 8mm ports for flexible tubing Maximum Pressure 20psi Response Time 0 5...

Page 3: ...fferential Function and Zero Offset 8 AC adaptor input 9 Min Max Record 10 RS 232 input Note The battery compartment is located on the bottom of the instrument Display Description 1 Hold Function 2 Differential Mode 3 Primary Data screen 4 Relative Time Clock 5 Pressure Unit indicator 6 Low Battery indicator 7 Max Min 8 Record Mode 1 2 3 4 5 6 7 8 9 10 ...

Page 4: ...ive time stamp 1 Press the REC button once and REC appears on the display All other functions are locked out except for Power Backlight The relative time clock also appears in the secondary display and starts counting 2 Press the REC button again and MAX appears on the display The display is now showing the maximum pressure and relative time that it was recorded 3 Press the REC button again to dis...

Page 5: ...ce Cleaning and storage 1 The meter should be cleaned with a damp cloth and mild detergent when necessary Do not use solvents or abrasives 2 Store the meter in an area with moderate temperature and humidity refer to the operating and storage range in the specifications chart earlier in this manual Battery Replacement When the battery power falls low BAT will appear on the LCD Replace the 9V batter...

Page 6: ...efore any product is returned to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied war...

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