pH/mV Meter
with Temperature
R3525
Instruction
Manual
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Table of Contents
Introduction ................................................................................................... 2
Product Quality ............................................................................................. 3
Safety ............................................................................................................ 3
Features ........................................................................................................ 3
Included ........................................................................................................ 3
Specications ................................................................................................ 4
Instrument Description .................................................................................. 5
Display Description ....................................................................................... 5
Operating Instructions ............................................................................. 6-10
Power ON/OFF ........................................................................................ 6
Selecting the Temperature Unit of Measure ............................................ 6
pH or ORP Modes ................................................................................... 6
pH Measurement Mode (Automatic Temperature Compensation) ............ 7
pH Measurement Mode (Manual Temperature Compensation) ................. 7
mV Output Measurement Mode (pH Electrode) ...................................... 8
ORP Measurement Mode (Optional R3525-ELECTRODE2 required) ........ 8
Over Range .............................................................................................. 8
pH Calibration Procedure ..................................................................... 8-9
ORP Calibration ..................................................................................... 10
Battery Replacement .................................................................................. 10
Applications ................................................................................................ 10
Accessories and Replacement Parts .......................................................... 11
Product Care ............................................................................................... 11
Product Warranty ........................................................................................ 12
Product Disposal and Recycling ................................................................. 12
Product Support ......................................................................................... 12
Introduction
Thank you for purchasing your REED R3525 pH/mV Meter with
Temperature. Please read the following instructions carefully before using
your instrument. By following the steps outlined in this manual your meter
will provide years of reliable service.
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Product Quality
This product has been calibrated during the manufacturing process to
meet stated product specications. If a certicate of calibration is required
please contact the nearest authorized REED distributor or authorized
Service Center. Please note an additional fee for this service will apply.
Safety
Never attempt to repair or modify your instrument. Dismantling your
product, other than for the purpose of replacing batteries, may cause
damage that will not be covered under the manufacturer's warranty.
Servicing should only be provided by an authorized service center.
Features
• Measures pH and mV levels in liquids
• Measures ORP (mV) levels in water with R3525-ELECTRODE2 (optional)
• Microprocessor provides automatic buffer solution recognition
• Dual LCD displays pH or mV and Temperature simultaneously
• Automatic Temperature Compensation (ATC)
• User selectable °F or °C
• Designed for handheld or wall mount applications
• Replaceable electrode module
• Low battery indicator and auto shut off
Included
• pH/mV Meter
• pH Electrode
• Protective Holster
• 4 and 7pH Buffer Solution
• Mounting Suction Cup
• Battery
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Specifications
pH
Measuring Range: 0.00 to 14.00pH
Accuracy: ±(0.01pH +1 dgt.)
Resolution: 0.01pH
ORP (Optional R3525-ELECTRODE2 required)
Measuring Range: -1999 to 2000mV
Accuracy: ±(2mV +1 dgt.)
Resolution: 0.1/1mV
Temperature
Measuring Range: 32 to 230°F (0 to 110°C)
Accuracy: ±0.4°F (0.2°C) +1 dgt
Resolution: 0.1°F (0.1°C)
General Specifications
Display: Dual Display, LCD
Auto Shut-off: Yes (after 10 minutes/off)
Low Battery Indicator: Yes
Power Supply: 9V Battery or AC Adapter (optional)
Product Certications: CE
Operating Temperature: 32 to 122°F (0 to 50°C)
Storage Temperature: 14 to 140°F (-10 to 60°C)
Operating Humidity Range: 10 to 80%
Dimensions: 4.3 x 3.0 x 1.2" (108 x 75 x 30mm)
Weight: 0.3lb (135g)
-1999 to 2000mV
±(2mV +1 dgt.)
0.1/1mV
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Instrument Description
1. LCD Display
2. POWER/Calibration Button
3. Up Button
4. Temperature Input Jack
5. Electrode Input (BNC) Jack
6. Power Adapter Input Jack
7. Down Button
8. pH/mV Function Button
Display Description
1. Measurement Mode Indicator
2. pH/ORP (mV) Measurement
Reading
3. Calibration Mode Indicator
4. Calibration Error Indicator
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5. Low Battery Indicator
6. Temperature Measurement
Reading
7. Auto/Manual Temperature
Compensation Indicator
8. Unit of Measure Indicator
Operating Instructions
Prior to first use with the meter, the pH electrode should
be calibrated. Refer to the pH Calibration section
of this manual for further instructions.
Power ON/OFF
Turn the meter on or off by pressing the button.
Selecting the Temperature Unit of Measure
When the meter is rst powered ON, the default scale setting is set to
Celsius (°C). Press and hold the
of measure.
Note: The meter will automatically save the selected unit of measure as
the new default when powered off.
pH or ORP Modes
This meter offers pH and ORP modes of measurement capable of
measuring 0.00 to 14.00pH and -1999 to 2000mV (ORP) (Optional
R3525-ELECTRODE2 required).
pH measurements achieve better results when the temperature
of the solution being tested is known and a temperature
compensation factor is applied. This can be attained using
manual or automatic temperature compensation. The electrode
included with the R3525 automatically compensates for solution
temperature changes with the electrode's built-in thermometer.
The temperature compensation is active when the solution
temperature deviates from room temperature. The temperature
of a solution is displayed on the lower LCD line. For manual
temperature compensation, an external temperature probe is not
connected to the meter and the temperature of the solution under
test is manually entered.
button to switch the temperature unit
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continued...
pH Measurement Mode
(Automatic Temperature Compensation)
Note: Electrodes should always be rinsed before and between
samples with distilled or DI (de-ionized) water to remove all
traces of previous test solution or storage solution.
1. Connect the included pH Electrode into the Input (BNC) Jack and
temperature input jack.
2. Press the
3. Place the pH electrode into the measured solution, so that the tip of
the electrode and junction are fully immersed and stir at a moderate,
uniform rate. The top of the LCD will display the pH value while
the bottom part of the LCD will display the automatic temperature
compensation value.
Note: When measurements have been completed, be sure to store the pH
electrode in its protective cap.
button to select pH mode.
pH Measurement Mode
(Manual Temperature Compensation)
1. Connect the included pH Electrode into the Input (BNC) Jack only.
2. Press the
3. Press the
being tested in °C or °F.
Note: By default, the meters temperature compensation factor is set to
25°C or 77°F.
4. Place the pH electrode into the measured solution, so that the tip of
the electrode and junction are fully immersed and stir at a moderate,
uniform rate. The top of the LCD will display the pH value while
the bottom part of the LCD will display the setting for the manual
temperature compensation value.
Note: When measurements have been completed, be sure to store the pH
electrode in its protective cap.
button to select pH mode.
and buttons to set the temperature of the solution
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continued...
mV Output Measurement Mode (pH Electrode)
Note: The millivolt capability of pH meters can be used to
determine the actual slope of pH electrodes but it is mostly
used to measure the voltage potential difference.
1. Connect the included pH Electrode into the Input (BNC) Jack.
2. Press the
3. Place the electrode into the measured solution, so that the tip of the
electrode and junction are fully immersed and stir at a moderate,
uniform rate.
4. The LCD will display the pH electrode output in mV.
button to select ORP mode.
ORP Measurement Mode
(Optional R3525-ELECTRODE2 required)
1. Connect the ORP Electrode into the Input (BNC) Jack.
2. Press the
3. Place the electrode into the measured solution, so that the tip of the
electrode and junction are fully immersed and stir at a moderate,
uniform rate.
4. The LCD will display the mV.
button to select mV (ORP) mode.
Over Range
When the pH value is under or over the meter's measuring range, the
LCD display will indicate "- - - -". If the electrode is not placed in any
solution or connected to the meter, the LCD display will also indicate "- - - -".
pH Calibration Procedure
In order to obtain the most accurate results possible,
a pH meter should be calibrated at least once a day.
If the pH meter is stored for an extended period of time, prior to calibration,
condition your electrode in pH 4 buffer solution or distilled water for a
minimum of 1 hour.
continued...
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1. Prepare buffer solutions for calibration. It is recommended to start
with pH 7.00 buffer solution, followed by either pH 4.00 or pH 10.00
(whichever is nearest to the expected sample value). Use the pH 4.00
and pH 7.00 buffer solutions when measurements are expected to
be on the lower side of the pH scale. Use the pH 7.00 and pH 10.00
buffer solutions when measurements are expected to be on the
higher side of the pH scale.
2. Connect the included pH Electrode into the Input (BNC) Jack and
temperature input jack.
3. Turn the meter on by pressing the
button.
4. Place the electrode into the pH buffer solution, so that the tip of
the electrode is fully immersed in the buffer solution, and stir at a
moderate, uniform rate.
5. Press and hold the
button for approx. 3 seconds to enter
calibration mode.
6.
The LCD will display "CAL" indicating the calibration process has begun.
7. The instrument automatically recognizes the solution and calibrates
to that value.
Note: If the solution is inaccurate by more than 1pH from either the 4, 7,
or 10pH buffer, or if the electrode slope is low or too high, the meter will
abort the calibration ("End" will be displayed).
8. During calibration, the pH reading ashes on the main display.
9. When calibration is complete, the meter will display "SA", followed
by "End" and resumes normal operation.
10. Repeat steps 4 through 8 for pH 4.00 and pH 10.00 buffer solutions.
11. When the 2- or 3- point calibration is complete, the meter will display
the percentage of slope (PTS), followed by "SA", then by "End" and
resumes normal operation.
Note: If the PTS is below 70% or above 130%, the electrode must be
replaced while a slope of 100% is ideal.
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continued...
ORP Calibration
(Optional R3525-ELECTRODE2 ORP Electrode required)
Calibration is not required for ORP mode, however, you can spot check
ORP measurements with the use of a specic ORP standard solution to
ensure the electrode is still within specications.
Battery Replacement
When the low battery icon appears on the LCD, the battery must
be replaced.
1. Disconnect the electrode.
2. Remove the instrument's protective holster by pulling it over the
top of the meter (make sure that the electrode is disconnected).
3. Remove the battery cover on the back.
4. Replace the 9V battery.
5.
Slide the battery cover back into place following the correct orientation.
6. Replace the protective holster.
Applications
• Water conditioning
• General purpose pH measurement
• Aquariums
• Wastewater monitoring
• Beverage production
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Accessories and Replacement Parts
• R3525-ELECTRODE Replacement pH Electrode
• R3525-ELECTRODE2 Optional ORP Electrode
• R3525-ADP Power Adapter
• R1404 pH Buffer Solution, 4.01, 500ml
• R1407 pH Buffer Solution, 7.0, 500ml
• R1410 pH Buffer Solution, 10.0, 500ml
• R1420 Electrode Storage Solution, 500ml
• R1425 Electrode Cleaning Solution, 500ml
• CA-05A Soft Carrying Case
Don't see your part listed here? For a complete list of all accessories and
replacement parts visit your product page on www.REEDInstruments.com.
Product Care
To keep your instrument in good working order we recommend the following:
• Store your product in a clean, dry place.
• Change the battery as needed.
• If your instrument isn't being used for a period of one month or longer
please remove the battery.
• Clean your product and accessories with biodegradable cleaner. Do not
spray the cleaner directly on the instrument. Use on external parts only.
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Product Warranty
REED Instruments guarantees this instrument to be free of defects in
material or workmanship for a period of one (1) year from date of shipment.
During the warranty period, REED Instruments will repair or replace, at no
charge, products or parts of a product that proves to be defective because
of improper material or workmanship, under normal use and maintenance.
REED Instruments total liability is limited to repair or replacement of the
product. REED Instruments shall not be liable for damages to goods,
property, or persons due to improper use or through attempts to utilize the
instrument under conditions which exceed the designed capabilities. In
order to begin the warranty service process, please contact us by phone
at 1-877-849-2127 or by email at info@reedinstruments.com to discuss
the claim and determine the appropriate steps to process the warranty.
Product Disposal and Recycling
Please follow local laws and regulations when disposing or recycling your
instrument. Your product contains electronic components and must be
disposed of separately from standard waste products.
Product Support
If you have any questions on your product, please contact your authorized
REED distributor or REED Instruments Customer Service by phone at
1-877-849-2127 or by email at info@reedinstruments.com.
Please visit www.REEDInstruments.com for the most
up-to-date manuals, datasheets, product guides and software.
Product specifications subject to change without notice.
All rights reserved. Any unauthorized copying or reproduction of
this manual is strictly prohibited without prior written permission
from REED Instruments.
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