406800 V2.1 11/06
2
Introduction
Congratulations on your purchase of the Extech 406800 Differential Pressure Manometer.
This device measures Gauge/Differential Pressure from 0 to 138.3 inH
2
O (inches of water).
It features 11 selectable units of measure: inH
2
O, psi, bar, mbar, kPa, inHg, mmHg, oz/in
2
,
ftH
2
O, cmH
2
O, kg/cm
2
. Additional features include: Data Hold, Auto Power Off disabled,
and an RS-232 for capturing readings to a PC using optional software (407752). Careful
use of this meter will provide years of reliable service.
Specifications
Function Range
Resolution
inH
2
O
±138.3inH
2
O 0.1inH
2
O
psi
±5.000psi 0.001psi
bar
±0.344bar 0.001bar
mbar
±344.7mbar 0.1mbar
kPa
±34.47kPa 0.01kPa
inHg
±10.18inHg 0.01inHg
mmHg
±258.5mmHg 0.1mmHg
ozin
2
±80.00oz/in
2
0.01oz/in
2
ftH
2
O
±11.53ftH
2
O 0.01ftH
2
O
cmH
2
O
±350.1cmH
2
O 0.1cmH
2
O
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 seconds typical
Compatibility
Air or Non-Corrosive Gases
Low Battery Indicator
Yes
Overrange Indicator
Err.1
Underrange Indicator
Err.2
Compensated Temperature Range
32 to 122
º
F (0 to 50
º
C)
Operating Conditions
32 to 122
º
F (0 to 50
º
C); < 80% RH non-condensing
Storage Conditions
-4 to 140
º
F (-20 to 60
º
C); <80% RH non-condensing
Power Supply
1 x 9V battery
Dimensions / Weight
7.1 x 2.8 x 1.1” (182 x 72 x 30mm); 7.7 oz. (220g)
Note:
Exceeding maximum pressure will cause sensor damage.
