Extech Instruments 407227 Manual de usuario

User's Guide

Heavy Duty pH, mV, & Temperature Meter

Model 407227

•Measures pH, mV and Temperature

•RS-232 PC Interface

•oC/oF switchable

•Front panel Slope and Calibration adjustments

Introduction

Congratulations on your purchase of Extech’s pH, mV, and Temperature Meter. This

professional meter, with proper care, will provide years of safe reliable service.

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Model 407227 Ver. 2.1 Oct. 2002

Page 2

Specifications

General Specifications

Display Dual function LCD with contrast adjust

Input impedance 1012 ohms

Temp. compensation for pH Automatic and manual 32 to 149°F (0 to 65°C)

pH electrode compatibility Any combination pH electrode with BNC connector

Data hold Freezes displayed reading

Memory recall Records / Recalls MAX (maximum), MIN

(minimum), and AVG (average) readings

Auto Power OFF Meter powers off after 10 minutes

PC Interface Serial RS-232 Communication

Over range indication All dashes on display "- - - -"

Sampling time Approximately 0.8 seconds

Operating conditions 32°F to 122°F (0°C to 50°C); < 80% RH

Power supply 9V battery (power consumption 5.7mA approx.)

Weight 0.59 lbs. / 270g (including batteries)

Dimensions 7.1 x 2.8 x1.3" (180 x 72 x 32mm)

Optional accessories ORP Electrode, AC adaptor, datalogger, and data

acquisition WindowsTM software

Range Specifications

Measurement Range Resolution Accuracy (of reading)

pH 0 to 14 pH 0.01 pH ± (0.03 pH + 2 digits)

mV ±1999 mV 1 mV ± (0.5% + 1 digits)

Temperature (oC) 0 to 50oC

50 to 65oC

0.1oC± 1oC

± 4oC

Temperature (oF) 32 to 122oF

122 to 149oF

0.1oF± 1.8oF

± 7.5oF

Meter Description

1. pH Electrode input (BNC jack)

2. RS-232 PC Interface jack

3. LCD display

4. Keypad

5. pH Electrode

6. Calibration potentiometers

7. Temperature sensor input jack

8. LCD Contrast adjustment wheel

9. Protective rubber holster

10. Battery compartment and tilt stand (rear)

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Model 407227 Ver. 2.1 Oct. 2002

Page 3

Temperature Compensation

For accurate pH measurements and calibration, the temperature of the solution under test

must be known. This can be accomplished manually or automatically. Read through the steps

for each (below) and determine that best method for the application at hand:

Automatic Temperature Compensation

NOTE: For Automatic Compensation, the supplied thermometer must be used. Perform

these steps before each use or when the temperature of the solution under test changes.

The thermometer can remain in the solution while taking pH measurements in order to

track temperature changes and compensate for them if necessary.

1. Select ‘pH ATC’ on the meter’s front panel slide-switch.

2. Plug the supplied thermometer into the meter’s temperature sensor input jack.

3. Place the other end of the thermometer into the solution under test.

4. Perform a pH Calibration or take a pH measurement as described later in the manual.

Manual Temperature Compensation

NOTE: For Manual Compensation, an external thermometer is required (separate from the

one supplied with the meter). Perform these steps before each use or when the

temperature of the solution under test changes

1. Place a thermometer in the solution under test and note the reading.

2. Select ‘pH MTC’ on the meter’s front panel slide-switch.

3. Press the "MTC" key and 25.0oC will display on the LCD temperature display line.

Using the ">>" key (for 1 oC steps) and the ">" key (for 0.1oC steps), edit the displayed

temperature. Continue editing until the displayed temperature equals the measured

temperature that was noted earlier.

4. Perform pH calibration or pH measurement normally.

Calibrating a new thermometer

1. Connect the thermometer to the meter’s temperature sensor input jack.

2. Select "pH ATC" via the meter’s front panel slide-switch.

3. Place the temperature probe and a mercury thermometer in water.

4. Adjust VR6 (inside the battery compartment, see diagram below) until the displayed

value matches the mercury thermometer reading.

VR6

Inside battery compartment

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Model 407227 Ver. 2.1 Oct. 2002

Page 4

pH Operation

IMPORTANT NOTE: Manual or Automatic Temperature Compensation (covered earlier in

this manual) must be performed before proceeding with pH calibration and pH

measurements.

pH CALIBRATION

Note that the meter must be calibrated before each use

1. Press the POWER key to turn the meter on (if it isn’t already on).

2. Connect the Combination pH electrode to the meter’s BNC input socket and place the

electrode in a pH 7 buffer solution.

3. Turn the CAL pH7 potentiometer on the front panel until the display reads 7.00

4. Rinse the electrode with distilled water.

5. Place the electrode in the pH 4 or pH 10 buffer solution.

6. Turn the SLOPE pH potentiometer until the display reads 4.00 or 10.00.

7. Rinse the electrode in distilled water.

8. Repeat as necessary.

Note that if the adjustments described above do not yield a 4, 7, or 10 pH reading, as the

case may be, the electrode may require replacing.

pH MEASUREMENTS

1. Connect the combination pH electrode to the meter’s BNC input socket.

2. Turn the meter on using the POWER key.

3. Place the electrode in the test solution and read the displayed pH value.

4. After measuring, rinse the electrode with distilled water.

ORP Operation (millivolts)

1. Connect the mV electrode (not supplied) to the BNC input jack at the top of the meter.

2. Turn the meter on using the POWER switch.

3. Select ‘mV’ (millivolts) via the meter’s front panel slide-switch.

4. Place the electrode in the test solution and read the millivolt (ORP) value.

5. Rinse the electrode with distilled water before storing.

Note that calibration is not required for the ORP function.

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Model 407227 Ver. 2.1 Oct. 2002

Page 5

Advanced Features

MIN MAX AVG Record / Recall Mode

1. Press the RECORD key (the REC indicator will appear on the LCD).

2. Press the CALL key to view the highest (MAX) reading recorded since the RECORD

key was first pressed. The MAX indicator will appear on the LCD.

3. Press the CALL key to view the lowest (MIN) reading recorded since the RECORD key

was first pressed. The MIN indicator will appear on the LCD.

4. Press the CALL key to view the average (AVG) reading recorded since the RECORD

key was first pressed. The AVG indicator will appear on the LCD.

5. Press the RECORD key again to exit this mode.

6. Note that the Auto Power OFF feature is disabled in this mode.

Automatic Power OFF Feature

This meter is equipped with a battery conservation feature that automatically shuts off the

power after approximately 10 minutes. To defeat this feature, put the meter in the MIN

MAX AVG Record / Recall mode by pressing the RECORD key. To turn the meter off, exit

the Record mode first (by pressing the RECORD key until the RECORD display icon

switches off) and then pressing the POWER key.

Data Hold

Press the HOLD key to freeze the displayed reading. The DH indicator will switch on in the

Data Hold mode. Press the HOLD key again to exit the Data Hold mode and the DH

indicator will switch off.

RS-232 Serial PC Interface

The 407227 is equipped with an RS-232 serial data port. This interface was designed to

operate with the Extech Data Acquisition Software (Part Number 407001). For detailed

information contact your distributor or refer to the 407001 manual.

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Model 407227 Ver. 2.1 Oct. 2002

Page 6



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: [email protected]

Repair/Returns: Ext. 210; Email: repair@extech.com

Website: www.extech.com

Battery Replacement

The low battery indicator (LBT) appears on the LCD when the 9V battery needs replacing.

1. Remove the meter's rubber protective holster.

2. Open the battery compartment using a small coin or screwdriver.

3. Replace the 9V battery and re-assemble the meter.

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

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 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 ext. 210 for authorization or visit our

website at www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA

number). 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.

Shop for Extech products at: 1.877.766.5412

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