Heavy Duty
Differential Pressure Manometer
Model 407910
User's Guide
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Introduction
Congratulations on your purchase of the Extech Manometer Model 407910. This device has a
differential input with convenient quick-disconnect fittings. Eight units of measure are selectable by
front panel pushbutton. Advanced features include Data hold, MAX/MIN record/recall, and RS-232
PC interface. Properly used, this device will provide years of reliable service.
Specifications
General Specifications
Circuit Custom one-chip LSI microprocessor circuit
Display 0.6" (15mm) 6000 count LCD with function indicators
Units of Measure mBAR, psi, kg/cm2, mm Hg, inches Hg, meter H2O, inches H2O and
Input circuit Differential inputs (P1 and P2)
Data Hold Freezes displayed reading
Sensor Built-in piezoelectric sensors
Zero Adjust Front panel push-button
Sample rate 0.8 sec. (approx.)
Compatibility Air or non-corrosive and non-ionized gas
Auto Power OFF Meter turns off after approx. 10 minutes to conserve energy
Data Output RS-232 PC serial interface
Ambient conditions 32 to 122oF (0 to 50oC); < 80% RH
Battery power 9V alkaline battery
Power Consumption 8mA DC (approx.)
Dimensions 7.1 x 2.8 x1.3" (180 x 72 x 32 mm)
Weight 0.46 lbs (210 g) meter only
Accessories Quick-disconnect fittings (2), rubber jacket, and 9V battery
Range Specifications
Range/Units (Max.) Resolution
± 2000 mbar 1
± 29 psi 0.01
± 2.040 Kg/cm2 0.001
± 1500 mm Hg 1
± 59.06 inches Hg 0.02
± 20.40 meters H2O 0.01
± 802 inches H2O 0.5
± 1.974 atmospheres 0.001
Atmospheres
Accuracy
± 2% full scale @ 23±5
Note: Accuracy includes linearity,
hysteresis and repeatability effects
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Meter Description
1. LCD Display – Indicates the measurement data, unit of measure, and user alert symbols as
described in this manual
2. Push-buttons:
POWER – Press to turn the meter ON or OFF
HOLD – Press to freeze the displayed reading
ZERO – Press to null the display (with fittings disconnected)
RECORD/RECALL – Press to access the MIN/MAX recording mode as described later in
this manual
UNIT – Press to select the unit of measure
3. 0.16” (4mm) Quick-disconnect fittings (supplied)
4. P1 Input – 0.16” (4mm) accepts quick disconnect connector
5. RS-232 PC interface jack (3.5mm) – For use with data acquisition software/hardware interface
kit model 407001
6. P2 input – 0.16” (4mm) accepts quick disconnect connector
7. Rubber protective holster (removable)
8. Battery compartment (on rear) – Remove rubber jacket to access compartment
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Basic Operation
Meter Power
This device uses a 9V battery for power. If the meter does not switch on when the POWER button is
pressed or if the display shows LBT, replace the battery (refer to the Battery Replacement section
later in this manual).
In order to conserve battery life, the meter has an automatic power off feature (after 10 minutes). To
defeat this feature, access the RECORD mode by pressing the RECORD/RECALL button. In the
RECORD mode, the meter will remain on until the user turns it off or until the battery weakens.
Unit of measure
Press the UNIT button to select the unit of measure. This meter offers eight (8) units of measure as
listed below, in the specifications chart earlier in this manual, and on the face-plate of the meter.
Units Displayed Symbol
MBAR "m" at bottom of the LCD and "Bar" at the top
Kg/cm2 Kg /cm2
mm of Hg mm /Hg
m H2O m H2O
Atmospheres ATP
PSI PSI
Inches of Hg in/Hg
Inches of H2O inch H2O
Zero Adjust and Offset function
Before use and without fittings attached to the meter, press the ZERO button to calibrate the
meter’s circuitry. The display should then indicate zero.
If it is desired to offset the meter’s display, press the ZERO 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 ZERO button was pressed.
Fittings Connection
Connect tubing to the quick-disconnect fittings and then snap the supplied quick-disconnect fitting(s)
to the P1, P2 (or both) input port(s). If both inputs are used (differential mode), the meter displays a
positive pressure reading if the P1 pressure is greater than P2 and a negative reading if P2 is
greater than P1.
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MIN/MAX Record/Recall Mode
The Record/Recall function tracks the maximum and minimum readings for recall at any time.
1. Press the RECORD/RECALL button once. The REC indicator will appear on the display.
2. Press the RECORD/RECALL button again to view the highest (MAX) reading taken since the
RECORD/RECALL button was first pressed. The MAX indicator and maximum reading will
appear on the display.
3. Press the RECORD/RECALL button again, the MIN indicator and the minimum value will appear
on the display.
4. To return to normal operation, press and hold the RECORD/RECALL button until the display
indicators REC, MAX, and MIN disappear.
RS-232 PC Interface
The meter has a built-in RS-232 serial port. For streaming of data to a PC via the RS232 Output
jack, the optional 407001-USB kit (RS232 to USB cable and driver CD) along with the 407001
software (available free at www.extech.com) are required.
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Battery Replacement
When the low battery indicator LBT 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. Remove the meter's rubber protective jacket by stretching it over the bottom of the meter.
2. Pry open the battery compartment located on the back of the meter using a small coin or
screwdriver.
3. Replace the 9V alkaline battery
4. Replace the battery compartment cover and the protective jacket.
Useful Conversions
Useful conversion Factors
From To Multiplier
In of H2O In of Hg 0.07355
In of H2O Cm of Hg 2.54
mm of Hg In of H2O 0.03937
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