Hanna Instruments pH 211R User manual

Instruction Manual
pH211R
Microprocessor-based
Bench pH/mV/°C Meter
with Analog Output
www.hannainst.com

32
PRELIMINARY EXAMINATION
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 [email protected].
This instrument is in compliance with the directives.
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.
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
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.

54
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 1012 Ω
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.)

76
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 consid-
eration. 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 tem-
perature 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.
TAKING ORP MEASUREMENTS
An optional ORP electrode must be used to perform ORP measure-
ments (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.
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 elec-
trode plug to the reference socket (#12 on page 4).
For temperature measurements and automatic temperature compen-
sation, 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 de-
faults 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.
• The pH reading is displayed on the primary LCD and temperature
on the secondary one.
• To view the mV reading, press the RANGE key.
4 cm
(1½")

98
• Switch the meter on and press the RANGE
key to enter the mV mode.
• Submerge the ORP electrode tip (4 cm /
1½") into the sample. Allow a few minutes
for the reading to stabilize.
• The meter displays the mV reading on the primary LCD.
• If reading is out of range, "---" will appear on the LCD.
TAKING TEMPERATURE MEASUREMENTS
Connect the HI 7669/2W temperature probe
to the proper socket on the rear panel and
turn the instrument on. Dip the temperature
probe in the sample and allow the reading to
stabilize.
HOLD FUNCTION
Press and hold the MEM key. The last reading will be frozen on the
display until MEM is released. During this operation, the MEM
indicator is also shown on the LCD.
Press MR to recall the previously memorized
reading. The value will be displayed with the
MEM indicator on the LCD.
4 cm
(1½")
OUTPUT RECORDER FUNCTION
Connect the recorder to the analog output socket and turn the
instrument ON. The value on the analog output will be related with
the pH or mV value displayed on the LCD as follows:
pH: 0 7 14
mV: -2000 0 2000
analog output: 0 V 2.5 V 5 V
RESET
The RESET button (#14 on page 4) should only be used when the
instrument displays erroneous messages due to strong electrical inter-
ference or when the power supply was disconnected before switching
the meter off.
After pressing RESET, always recelibrate the unit before proceeding.
pH CALIBRATION
Frequent calibration is recommended. Moreover, the instrument should
be re-calibrated for pH:
a) whenever the pH electrode is replaced
b) at least once a week
c) after testing aggressive chemicals
d) if higher accuracy is required
e) after the RESET button has been pressed
PREPARATION
Pour small quantities of the buffer solutions into clean beakers. If
possible use plastic beakers to minimize any EMC interferences.
For accurate calibration and to minimize cross contamination use two
beakers for each buffer solution. One for rinsing the electrode and the
second for calibration.
If you are measuring in the acid range, use pH 4.01 as second
buffer; if you are measuring in the alkaline range, use pH 10.01 or
pH 9.18 as second buffer.
PROCEDURE
Five memorized buffer values are available for calibration: pH 4.01,
6.86, 7.01, 9.18 and 10.01.
Calibration can be performed at 1 or 2 points. For best accuracy, a 2
point calibration is recommended.

1110
•Press CAL to quit calibration. The meter
will save the one-point calibration data
and return to normal mode.
Two-Point Calibration
Any two of the 5 memorized buffers can be used for this purpose.
However, it is recommended to choose pH 6.86 or 7.01 as the first
point and pH 4.01 (acidic sample) or pH 9.18/10.01 (alkaline
environment) as the second point.
•After the first calibration point is con-
firmed, immerse pH electrode and
temperature probe approx. 4 cm (1½") in
the second buffer solution and stir gently.
The temperature probe should be close to
the pH electrode.
•If necessary, press ▲°C or ▼°C to select a
different buffer value.
Note: The meter will automatically skip the buffer used for the first
point. It also skips pH 6.86 if 7.01 was used, and viceversa,
and pH 9.18 if 10.01 was used, and viceversa.
•The "NOT READY" indication will blink on
LCD until the reading has stabilized.
•When the reading is stable, "READY" and "CFM" will blink. Press
CFM to confirm the calibration.
•If the reading is close to the selected buffer, the meter stores the
calibration point, displays the "Stor" message for 1 second and
returns to normal operational mode.
•If the measured value is not close to the
selected buffer, "WRONG " and "WRONG
" will blink alternately.
In this case check if the correct buffer has been used, or refresh
the electrode by following the maintenance procedure (see "Elec-
trode Maintenance" section). If necessary change buffer or electrode.
Note: Press RANGE to display the temperature reading on the LCD
during calibration.
One-Point Calibration
•Immerse pH electrode and temperature
probe approximately 4 cm (1½") into
any of the available buffer solutions (pH
4.01, 6.86, 7.01, 9.18 or 10.01) and
stir gently. The temperature probe should
be close to the pH electrode.
•Press CAL. The "CAL" and " " indicators, and "7.01" will be
displayed.
Note: The buffer value displayed on the secondary LCD, varies with
temperature. For example, at 20ºC it shows 4.00, 7.03 and
10.06, while at 25ºC it shows 4.01, 7.01 and 10.01.
•If necessary, press ▲°C or ▼°C to select
a different buffer value.
•The "NOT READY" indication will blink on
the LCD until the reading has stabilized.
•When the reading is stable, "READY" and "CFM" will blink. Press
CFM to confirm the calibration.
•If the reading is close to the selected buffer value, the meter stores
the calibration point. The "Stor" message appears on the LCD for
1 second, then the buffer value is displayed on the primary LCD
and the secondary LCD displays the second expected buffer value.
•If the measured value is not close to the
selected buffer, the "WRONG " and
"WRONG " symbols will blink alter-
nately.
In this case check if the correct buffer has been used or refresh the
electrode by following the maintenance procedure (see "Electrode
Maintenance" section). If necessary change the buffer or the
electrode.
4 cm
(1½")
4 cm
(1½")

1312
For refillable electrodes
If the filling solution (electrolyte) is more than 2.5 cm (1") below the
fill hole, add HI 7082 3.5M KCl electrolyte solution for double junction
or HI 7071 3.5M KCl+AgCl electrolyte solution for single junction
electrodes.
For a faster response, unscrew the fill hole screw during measure-
ments.
For AmpHel® electrodes
If the electrode does not respond to pH changes, the battery is run
down and the electrode should be replaced.
MEASUREMENT
Rinse the electrode tip with distilled water. Immerse the tip (bottom 4
cm /1½") in the sample and stir gently for a few seconds.
For a faster response and to avoid cross contamination of the samples,
rinse the electrode tip with a few drops of the solution to be tested,
before taking measurements.
STORAGE
To minimize clogging and assure a quick response time, the glass bulb
and the junction should be kept moist and not allowed to dry out.
Replace the solution in the protective cap with a few drops of
HI 70300 storage solution or, in its absence, filling solution (HI 7071
for single junction or HI 7082 for double junction electrodes). Follow
the Preparation Procedure above before taking measurements.
Note: NEVER STORE THE ELECTRODE IN DISTILLED OR DEIONIZED WATER.
PERIODIC MAINTENANCE
Inspect the electrode and the cable. The cable used for connection to
the meter must be intact and there must be no points of broken
insulation on the cable or cracks on the electrode stem or bulb.
Connectors must be perfectly clean and dry. If any scratches or cracks
are present, replace the electrode. Rinse off any salt deposits with
water.
For refillable electrodes:
Refill the reference chamber with fresh electrolyte (HI 7071 for single
junction or HI 7082 for double junction electrodes). Allow the elec-
trode to stand upright for 1 hour.
Follow the Storage Procedure above.
AmpHel®is a registered Trademark of "Hanna Instruments"
ELECTRODE CONDITIONING & MAINTENANCE
PREPARATION
Remove the protective cap.
DO NOT BE ALARMED IF SALT DEPOSITS ARE PRESENT. This is normal
with electrodes and they will disappear when rinsed with water.
During transport tiny bubbles of air may form inside the glass bulb
affecting proper functioning of the electrode. These bubbles can be
removed by "shaking down" the electrode as you would do with a
glass thermometer.
If the bulb and/or junction is dry, soak the electrode in HI 70300
storage solution for at least one hour.
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 instrument
and immerse it in the storage solution.

1514
TEMPERATURE-RESISTANCE CORRELATION FOR
HANNA pH SENSITIVE GLASS
The resistance of glass electrodes partially depends on the temperature.
The lower the temperature, the higher the resistance. It takes longer time
for the reading to stabilize if the resistance is higher. In addition, the
response time will suffer to a greater degree at temperatures below 10°C.
Since the resistance of the pH electrode is in the range of 200 Mohm,
the current across the membrane is in the pico Ampere range. Large
currents can disturb the calibration of the electrode for many hours.
For these reasons high humidity environments, short circuits and
static discharges are detrimental to a stable pH reading.
The pH electrode's life also depends on the temperature. If constantly
used at high temperatures, the electrode life is drastically reduced.
Typical Electrode Life
Ambient Temperature 1- 3 years
90 °C Less than 4 months
120°C Less than 1 month
High concentrations of sodium ions interfere with readings in alkaline
solutions; the pH at which the interference starts to be significant
depends upon the composition of the glass. This interference is the
alkaline error and causes the pH to be underestimated. Hanna's glass
formulations have the indicated characteristics.
CLEANING PROCEDURE
General Soak in Hanna HI 7061 general cleaning solution for
approximately 30 minutes.
Removal of films, dirt or deposits on the membrane/junction:
- Protein Soak in Hanna HI 7073 protein cleaning solution for
15 minutes.
- Inorganic Soak in Hanna HI 7074 inorganic cleaning solution
for 15 minutes.
- Oil/grease Rinse with HI 7077 Oil & Fat cleaning solution.
IMPORTANT: After performing any of the cleaning procedures rinse
the electrode thoroughly with distilled water, refill the reference cham-
ber with fresh electrolyte (not necessary for gel-filled electrodes) and
soak the electrode in HI 70300 storage solution for at least 1 hour
before taking measurements.
TROUBLESHOOTING
Evaluate the performance of your electrode based on the following.
•Noise (readings fluctuate up and down) could be due to:
– Clogged/Dirty Junction: refer to the Cleaning Procedure.
– Loss of shielding due to low electrolyte level (in refillable
electrodes only): refill with fresh HI 7071 for single junction or
HI 7082 for double junction electrodes.
•Dry Membrane/Junction: soak in HI 70300 storage solution for
at least 1 hour.
•Drifting: soak the electrode tip in warm (approx. 50-60°C)
Hanna HI 7082 solution for one hour and rinse the tip with
distilled water. Refill with fresh HI 7071 for single junction
electrodes and HI 7082 for double junction electrodes (refillable
electrodes only).
•Low Slope: refer to the cleaning procedure above.
•No Slope: check the electrode for cracks in glass stem or bulb
and replace the electrode.
•Slow Response/Excessive Drift: soak the tip in HI 7061
solution for 30 minutes, rinse thoroughly in distilled water and
then follow the Cleaning Procedure above.
-2
0
-2
0
-10
0
+1
0
+2
0
+
30
+4
0
+
50
+
60
+7
0
+
80
+
90
°
C
-10
-10
Ω
-10
-10
-10
-10
Ω
2x109
1x109
2x108
1x108
2x107
1x107
-20 -10 0 +10 +20+30+40 +50 +60 +70 +80 +90 °C
Alkaline Error
1.0 Mol L-1 Na+
0.1 Mol L-1 Na+
Sodium Ion Correction for the Glass at 20-25°C
Concentration pH Error
13.00
13.50
14.00
12.50
13.00
13.50
14.00
0.10
0.14
0.20
0.10
0.18
0.29
0.40

1716
ACCESSORIES
pH CALIBRATION SOLUTIONS
HI 70004P pH 4.01 buffer solution, 20 mL sachet, 25 pcs
HI 70007P pH 7.01 buffer solution, 20 mL sachet, 25 pcs
HI 70010P pH 10.01 buffer solution, 20 mL sachet, 25 pcs
HI 7004L pH 4.01 buffer solution, 500 mL bottle
HI 7006L pH 6.86 buffer solution, 500 mL bottle
HI 7007L pH 7.01 buffer solution, 500 mL bottle
HI 7009L pH 9.18 buffer solution, 500 mL bottle
HI 7010L pH 10.01 buffer solution, 500 mL bottle
HI 8004L pH 4.01 buffer solution in FDA bottle, 500 mL
HI 8006L pH 6.86 buffer solution in FDA bottle, 500 mL
HI 8007L pH 7.01 buffer solution in FDA bottle, 500 mL
HI 8009L pH 9.18 buffer solution in FDA bottle, 500 mL
HI 8010L pH 10.01 buffer solution in FDA bottle, 500 mL
ELECTRODE MAINTENANCE SOLUTIONS
HI 70300L Storage solution, 500 mL bottle
HI 80300L Storage solution in FDA bottle, 500 mL
HI 70000P Rinsing solution, 20 mL sachet, 25 pcs
HI 7061L General cleaning solution, 500 mL bottle
HI 8061L General cleaning solution in FDA bottle, 500 mL
HI 7073L Protein cleaning solution, 500 mL bottle
HI 8073L Protein cleaning solution in FDA bottle, 500 mL
HI 7074L Inorganic cleaning solution, 500 mL bottle
HI 7077L Oil & Fat cleaning solution, 500 mL bottle
HI 8077L Oil & Fat cleaning solution in FDA bottle, 500 mL
HI 7071 3.5M KCl+AgCl electrolyte solution, 4 x 50 mL bottle,
for single junction electrodes
HI 8071 3.5M KCl+AgCl electrolyte solution in FDA bottle, 4 x 50
mL, for single junction electrodes
HI 7072 1M KNO3electrolyte solution, 4 x 50 mL bottle
HI 8072 1M KNO3electrolyte solution in FDA bottle, 4 x 50 mL
HI 7082 3.5M KCl electrolyte solution 4 x 50 mL bottle, for
double junction electrodes
HI 8082 3.5M KCl electrolyte solution in FDA bottle, 4 x 50 mL,
for double junction electrodes
TROUBLESHOOTING GUIDE
Symptoms Problem Solution
The meter is slow in
responding or gives
faulty readings
The meter does not ac-
cept the 2nd buffer
solution for calibration
The reading drifts
Display shows:
Display shows:
Display shows:
Display shows:
"WRONG "
and
"WRONG "
Display shows:
"WRONG "
and
"WRONG "
The meter does not
work with the tempera-
ture probe
The meter fails to cali-
brate or gives faulty
readings
The electrode is not work-
ing or the reference
junction is clogged
Out of order pH electrode
Defective pH electrode
Out of range pH scale
Out of range tempera-
ture scale
Out of range mV scale
Erroneous buffer solution
used for offset calibra-
tion
Defective electrode
Erroneous buffer solution
used for slope calibration
Defective electrode
Out of order temperature
probe
Out of order pH electrode
Leave the electrode in a stor-
age solution after cleaning
the junction. If problem per-
sists, replace the electrode
Follow the cleaning proce-
dure. If this doesn't work
replace the electrode
Replace the electrode
a) Recalibrate
b) Make sure the pH sample
is in the 0 to 14 range
c) Check the electrolyte level
and the general state of
the pH electrode
Make sure the temperature
is in the 0 to 100°C range
and the temperature probe is
plugged in
Electrode not connected
Make sure the buffer setting
is correct and the solution is
fresh. Replace the buffer if
necessary
Replace the electrode
Make sure the buffer setting
is correct and the solution is
fresh. Replace the buffer if
necessary
Replace the electrode
Replace the probe
Replace the electrode

1918
HI 1330B
Glass body, semimicro, single junction, refillable, combination pH
electrode. Use: laboratory, vials.
HI 1331B
Glass body, semimicro, single junction, refillable, combination pH
electrode. Use: flasks.
HI 1230B
Plastic body, double junction, gel-filled, combination pH electrode.
Use: general, field.
HI 2031B
Glass body, semimicro, conic, refillable, combination pH electrode.
Use: semisolid products.
HI 1332B
Plastic body, double junction, refillable, combination pH electrode.
Use: general purpose.
120 mm
4.7"
5mm
0.2"
5mm DIA
0.2"
"S" VERSION
HI 1330
120 mm
4.7"
12 mm
0.5"
"
S
"
VERSION
HI 1230
75 mm
2.
95
"
6 mm
0.25"
"
S
"
VERSION
HI 2031
120 mm
4.7"
12 mm
0.5"
"S" VERSION
HI 1332
210 mm
8.25"
8 mm
0.3" 7.5mm DIA
0.29"
"S" VERSION
HI 1331
ORP PRETREATMENT SOLUTIONS
HI 7091L Reducing pretreatment solution, 500 mL bottle
HI 7092L Oxidizing pretreatment solution, 500 mL bottle
pH ELECTRODES
All electrode part numbers ending in B are supplied with BNC
connector and 1 m (3.3') cable.
HI 1043B
Glass body, double junction, refillable, combination pH electrode.
Use: strong acid/alkali.
HI 1053B
Glass body, triple ceramic, conic shape, refillable, combination pH
electrode. Use: emulsions.
HI 1083B
Glass body, micro, Viscolene, non-refillable, combination pH electrode.
Use: biotechnology, micro titration.
HI 1131B
Glass body, single junction, refillable, combination pH electrode.
Use: general purpose.
120 mm
4.7"
12 mm
0.5"
9.5mm DIA
0.37"
"S" VERSION
HI 1043
120 mm
4.7"
12 mm
0.5"
"S" VERSION
HI 1053
120 mm
4
4
.
.
7
7
"
12 mm
0.5" 5 mm
0.2" 3 mm
0.12" 3.0 mm DIA
0.12"
HI 1083
120 mm
4.7"
12 mm
0.5"
9.5mm DIA
0.37"
"S" VERSION
HI 1131