Hanna Instruments pH 211R User Manual
Instruction Manual
pH211R
Microprocessor-based
Bench pH/mV/°C Meter
with Analog Output
www.hannainst.com
Dear Customer,
Thank you for choosing a Hanna Instruments Product.
Please read this instruction manual carefully before using the instru-
ment.
This manual will provide you with all the necessary information for
correct use of the instrument, as well as a precise idea of its versatility
in a wide range of applications.
If you need additional technical information, do not hesitate to e-mail
us at tech@hannainst.com.
This instrument is in compliance with the directives.
PRELIMINARY EXAMINATION
Remove the instrument from the packing material and examine it
carefully to make sure that no damage has occurred during shipping.
If there is any damage, notify your Dealer.
Each meter is supplied with:
• HI 1131B glass body pH electrode with BNC and 1 m cable
• HI 7669/2W temperature probe
• HI 76404 electrode holder
• pH 4.01 & pH 7.01 buffer solutions (20 mL each)
• HI 7071S electrolyte solution
• 12 Vdc power adapter
• Instruction manual
Note: Save all packing material until you are sure that the
instrument functions correctly. Any defective items must be
returned in the original packing with the supplied accessories.
TABLE OF CONTENTS
PRELIMINARY EXAMINATION......................................................... 3
GENERAL DESCRIPTION ................................................................3
FUNCTIONAL DESCRIPTION ...........................................................4
SPECIFICATIONS .......................................................................... 5
OPERATIONAL GUIDE ................................................................... 6
pH CALIBRATION.......................................................................... 9
ELECTRODE CONDITIONING & MAINTENANCE............................... 12
TEMPERATURE-RESISTANCE CORRELATION
FOR pH SENSITIVE GLASS .......................................................... 15
TROUBLESHOOTING GUIDE......................................................... 16
ACCESSORIES ............................................................................ 17
WARRANTY ................................................................................ 23
GENERAL DESCRIPTION
The Hanna pH 211R is an advanced microprocessor based bench pH
meter easy to operate, perfect for quality control laboratories.
pH 211R also measures in the temperature and mV ranges.
Temperature compensation is automatic thanks to the HI 7669/2W
temperature probe supplied with the instrument. If necessary the user
can also set temperature compensation manually.
The large display shows pH (or mV) and temperature values
simultaneously.
The user is guided through the calibration process with simple
instructions on the display.
The meter also features 0 to 5 V analog output.
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FUNCTIONAL DESCRIPTION
1) Liquid Crystal Display (LCD)
2) CFM key, to confirm calibration values
3) CAL key, to enter or exit calibration mode
4) ▼°C key, to manually decrease temperature or select pH buffer
5) ▲°C key, to manually increase temperature or select pH buffer
6) MR key, to recall the stored value
7) MEM key, to store a value in memory
8) RANGE key, to select measurement range
9) ON/OFF button, to switch the meter on and off
10) Socket for power adapter
11) BNC connector for measurement electrode
12) Reference electrode connector
13) Temperature probe socket
14) RESET button
15) Positive (+) analog output connector
16) Negative (-) analog output connector
SPECIFICATIONS
Range -2.00 to 16.00 pH
±399.9 / ±2000 mV
-9.9 to 120.0°C
Resolution 0.01 pH
0.1 / 1 mV
0.1°C
Accuracy (@20°C/68°F) ±0.01 pH
±0.2 / ±1 mV
±0.5°C
Typical EMC Deviation ±0.03 pH
±2 mV / ±0.3°C
pH Calibration Automatic, 1 or 2 point
with 5 memorized buffers (pH 4.01, 6.86, 7.01, 9.18, 10.01)
Temperature Compensation
Automatic (with HI 7669/2W probe) or manual
-9.9 to 120°C (14 to 248°F)
pH Electrode HI 1131B glass body, double junction, refillable,
BNC connector and 1 m cable (included)
Temperature Probe HI 7669/2W (included)
Input Impedance 10
Analog Output 0 to 5 VCC not isolated
Analog Output Accuracy ±10 mV
Power supply 12 Vdc adapter (included)
Environment 0 to 50°C (32 to 122°F); RH max 95%
Dimensions 240 x 182 x 74 mm (9.4 x 7.1 x 2.9")
Weight 1.1 kg (2.4 lb.)
12
Ω
54
OPERATIONAL GUIDE
Power Connection
Plug the 12 Vdc adapter into the power supply socket.
Note: Make sure the mains line is protected by a fuse.
Electrode and Probe Connections
Connect the BNC of the pH or ORP electrode to the BNC socket on the
rear panel.
For electrodes with a separate reference, connect the reference electrode plug to the reference socket (#12 on page 4).
For temperature measurements and automatic temperature compensation, connect the temperature probe to the appropriate socket.
Note: To prevent damage to the pH electrode, remove it from the
solution before turning the meter off.
With the meter OFF, detach the electrode from the meter and
immerse it in the storage solution.
TAKING pH MEASUREMENTS
Make sure that the instrument has been calibrated for pH before
taking pH measurements.
• Switch the instrument on by pressing the
ON button. The meter automatically defaults to the pH measurement mode.
• Submerge the tip (4 cm / 1½") of the
electrode and temperature probe into the
sample to be tested. Allow a couple of
minutes for the electrode to stabilize.
(1½")
If measurements are taken successively in different samples, it is
recommended to rinse the electrode thoroughly with water and then
with some of the next sample to be measured.
pH readings are affected by temperature. In order for the meter to
measure the pH accurately, temperature must be taken into consideration. To use the Automatic Temperature Compensation (ATC)
feature, submerge the HI 7669/2W temperature probe into the
sample as close to the electrode as possible and wait for a couple of
minutes.
If the temperature of the sample is known or tests are always
performed at the same temperature, you can simply manually
compensate for it. For this purpose the temperature probe must be
disconnected.
The display will then show the default temperature of 25°C with the "°C" symbol blinking.
Note the temperature of the sample using a
ChecktempC (HI 98501) or another accurate
thermometer as reference.
The temperature can now be adjusted with the ▲°C and ▼°C keys.
4 cm
• The pH reading is displayed on the primary LCD and temperature
on the secondary one.
• To view the mV reading, press the RANGE key.
TAKING ORP MEASUREMENTS
An optional ORP electrode must be used to perform ORP measurements (see accessories).
Oxidation-reduction potential (REDOX) measurements provide the
quantification of the oxidizing or reducing power of the sample tested.
To correctly perform a redox measurement, the surface of the ORP
electrode must be clean and smooth.
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