Extech Extech 407910 Manual

99 Washington Street
Melrose, MA 02176

Phone [phone]
Toll Free 1-800-517-8431

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User's Guide

Heavy Duty
Differential Pressure Manometer

Model 407910

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

Specifications

General Specifications

Circuit Custom one-chip LSI microprocessor circuit
Display 0.6" (16mm) 2000 count LCD with function indicators
Units of Measure mBAR, psi, kg/cm2, mm Hg, inches Hg, meter H2O, inches H2O

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 6mA DC (approx.)
Dimensions 7.1 x 2.8 x1.3" (180 x 72 x 32 mm)
Weight 0.76 lbs (345 g)
Accessories Quick-disconnect fittings (2), rubber jacket, and 9V battery

Range Specifications

Range/Units (Max.) Resolution

± 2000 mbar 1
± 29 psi 0.02
± 2.040 Kg/cm2 0.001
± 1500 mm Hg 1
± 59.05 inches Hg 0.05
± 20.40 meters H2O 0.01
± 802 inches H2O 0.5
± 1.974 atmospheres 0.001

and Atmospheres

Accuracy

± 2% full scale @ 23±5
Note: Accuracy includes linearity,

hysteresis and repeatability effects

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Model 407910 - Version 2.0 - March 2005

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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Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com

Model 407910 - Version 2.0 - March 2005

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 face­plate 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 quick­disconnect 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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Model 407910 - Version 2.0 - March 2005

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
display indicators REC, MAX, and MIN disappear.

RS-232 PC Interface

The meter has a built-in RS-232 serial port for use with the optional PC Interface Data
Acquisition Software/Hardware kit Model 407001.

the RECORD/RECALL button until the

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Model 407910 - Version 2.0 - March 2005

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

Calibration and Repair Services



Support line [phone]

Technical support: Extension 200; E-mail: [e-mail]

Repair & Returns: Extension 210; E-mail: [e-mail]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX [phone] - TestEquipmentDepot.com