Extech Instruments 407227 User 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.
Shop for Extech products at:
1.877.766.5412
ShopExtech.com
Model 407227 Ver. 2.1 Oct. 2002
Page 2
Specifications
General Specifications
Display
Dual function LCD with contrast adjust
Input impedance
10
12
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 Windows
TM
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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Shop for Extech products at:
1.877.766.5412
ShopExtech.com
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