Extech Instruments 406800 User manual

User's Guide

Differential Pressure Manometer

Model 406800

406800 V2.1 11/062

Introduction

Congratulations on your purchase of the Extech 406800 Differential Pressure Manometer.

This device measures Gauge/Differential Pressure from 0 to 138.3 inH2O (inches of water).

It features 11 selectable units of measure: inH2O, psi, bar, mbar, kPa, inHg, mmHg, oz/in2,

ftH2O, cmH2O, kg/cm2. 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

inH2O ±138.3inH2O 0.1inH2O

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

ozin2±80.00oz/in20.01oz/in2

ftH2O ±11.53ftH2O 0.01ftH2O

cmH2O ±350.1cmH2O 0.1cmH2O

kgcm2±0.351kg/cm2 0.001kg/cm2

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 122ºF (0 to 50ºC)

Operating Conditions 32 to 122ºF (0 to 50ºC); < 80% RH non-condensing

Storage Conditions -4 to 140ºF (-20 to 60ºC); <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.

406800 V2.1 11/063

Meter Description

1. 4.8mm input connectors

2. Dual LCD Display

3. On/Off

4. Data Hold and Zero Adjust

5. Unit of Measure

6. Backlight

7. Differential 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

406800 V2.1 11/064

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.

406800 V2.1 11/065

RS-232 PC Communications Interface

The meter has a built-in RS-232 serial port for use with the optional PC Interface Data

Acquisition Software/Hardware kit (407752).

Error Codes

An error message will appear on the display if the meter fails an internal diagnostic test.

Note: Error messages E10L and E2UL will not display on the LCD. They will be transmitted

to the PC via the RS-232 cable.

1. Err.1: Pressure value is over the range.

2. Err.2: Pressure is below the range.

3. Err.3: DIF function, the differential pressure value is over range.

4. Err.4: Zero function, disconnect tubing or repair/replacement necessary.

5. E10L: RS-232 error, Pressure value is over the range.

6. E2UL: RS-232 error, Pressure is below the range.

Maintenance

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 battery by

removing the Phillips screw on the battery compartment door and accessing the battery

compartment. Ensure that the compartment cover is securely fastened when finished.

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.

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

Warranty

EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of

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

warranty applies on 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 EXTENSION 210 for authorization or visit www.extech.com for

more 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 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 warranties or merchantability or fitness for a specific

purpose and will not be liable for any direct, indirect, incidental or consequential damages.

Extech's total liability is limited to repair or replacement of the product. The warranty set forth

above is inclusive and no other warranty, whether written or oral, is expressed or implied.

more infor for Extech EX542

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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