Extech 407228 Operating Manual

User's Guide

Heavy Duty pH, mV, & Temperature Meter

Model 407227

• Measures pH, mV and Temperature

• RS-232 PC Interface

oC/o

•

F 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.

Specifications

General Specifications

Dual function LCD with contrast adjust

Display

Input impedance

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

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

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

Temperature (oF) 32 to 122oF

122 to 149oF

12

ohms

10

(minimum), and AVG (average) readings

acquisition Windows

TM

software

0.1oC ± 1oC

0.1oF ± 1.8oF

± 4oC

± 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)

Model 407227 Ver. 2.1 Oct. 2002

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