Extech Instruments 407910 Manual de usuario

User's Guide

Heavy Duty

Differential Pressure Manometer

Model 407910

Model 407910 - Version 2.0 - March 2005

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects

in parts and workmanship for one year from date of shipment (a six month limited warranty

applies to sensors and cables). If it should become necessary to return the instrument for

service during or beyond the warranty period, contact the Customer Service Department at

(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact

information. A Return Authorization (RA) number must be issued before any product is

returned to Extech. The sender is responsible for shipping charges, freight, insurance and

Model 407910 - Version 2.0 - March 2005

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

and Atmospheres

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 Accuracy

± 2000 mbar 1

± 29 psi 0.02

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

456

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 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.

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 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 use with the optional PC Interface Data

Acquisition Software/Hardware kit Model 407001.

Support line (781) 890-7440

Technical support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: repair@extech.com

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

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

reilpitluMoTmorF

In of H255370.0gHfonIO

In of H245.2gHfomCO

mm of Hg In of H273930.0O

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Service Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

more infor for Extech 407910

Phone: 01235 838 555

Email: cs@airconcern.co.uk

Web. www.airconcern.co.uk

Air Concern Ltd, Building 173 Curie Avenue Harvell Didcot, Oxfordshire

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