Thank You
Thank you for choosing a Hanna Instruments product. Please read
this instruction manual carefully before using the instrument.
For more information about Hanna Instruments and our products,
visit www.hannainst.com.
For technical support, contact your local Hanna Instruments
Office or email us at [email protected]
Find your local Hanna Instruments Office at www.hannainst.com
Functional Description
Preliminary Examination
Remove the instrument from the packing material and examine
it carefully to make sure that no damage has occurred during
shipment. If noticeable damage is evident, contact your local Hanna
Instruments Office.
Note: Save all packing material until you are sure that the
instrument functions correctly. All defective items must be
returned in the original packing together with the supplied
accessories
.
Each meter is supplied with:
• HI73127 pH electrode
• HI73128 electrode removal tool
• 1.5V batteries (4 pcs.)
• Instruction manual
• Calibration card
General Description
HI98127
(pHep®4) and
HI98128
(pHep®5) are waterproof
pH and temperature meters. The housing has been completely
sealed against humidity and designed to float. All pH readings are
automatically temperature compensated (ATC), and temperature
values can be displayed in °C or °F units.
These meters can be calibrated at one or two points with auto-
buffer recognition and against five memorized buffer values. A
stability indicator is displayed on the LCD to ensure measurements
are highly accurate.
At start-up, these meters indicate battery level and will display a
low battery symbol to alert the user if the batteries need to be
replaced. In addition, the Battery Error Prevention System (BEPS)
avoids erroneous readings by turning the meter off when battery
voltage levels are too low.
The included
HI73127
pH electrode can be easily replaced and the
stainless steel encapsulated temperature sensor facilitates faster
and more accurate temperature measurement and compensation.
1. ATC (Automatic Temperature Compensation) indicator
2. Stability indicator
3. Battery life percentage indicator
4. Low battery indicator
5. Secondary display
6. Primary display
7. Measuring unit for primary display
Specifications
Range
-2.0 to 16.0 pH (
HI98127
)
-2.00 to 16.00 pH (
HI98128
)
-5.0 to 60.0 °C /
23.0 to 140.0 °F
Resolution
0.1 pH (
HI98127
)
0.01 pH (
HI98128
)
0.1 °C / 0.1 °F
Accuracy
(@25 °C / 77 °F)
±0.1 pH (
HI98127
)
±0.05 pH (
HI98128
)
±0.5 °C / ±1.0 °F
Temperature
Compensation
automatic
Environment
-5 to 50 °C (23 to 122 °F); RH 100%
Calibration
1 or 2 points with 2 sets of memorized
buffers (pH 4.01 / 7.01 / 10.01 or
pH 4.01 / 6.86 / 9.18)
Electrode
HI73127
pH electrode (included)
Battery Type
1.5V (4 pcs.)
Battery Life
with BEPS / approx. 300 hours
Auto-off
after 8 minutes of non-use
Dimensions
171 x 41 x 26 mm (6.7 x 1.6 x 1.0”)
Weight
84 g (3.0 oz)
Calibration
For better accuracy, frequent calibration of the instrument is
recommended. In addition, the instrument must be recalibrated
whenever:
a) The pH electrode is replaced.
b) After testing aggressive chemicals.
c) Where high accuracy is required.
d) At least once a month.
Calibration procedure
From normal measuring mode, press and hold the /MODE button
until “OFF” on the secondary LCD is replaced by “CAL”. Release
the button. The LCD enters the calibration mode displaying “pH
7.01 USE” (or “pH 6.86 USE” if the NIST buffer set was selected).
After 1 second the meter activates the automatic buffer recognition
feature. If a valid buffer is detected then its value is shown on
the primary display and “REC” appears on the secondary LCD. If
no valid buffer is detected, the meter keeps the “USE” indication
active for 12 seconds, and then it replaces it with “WRNG”,
indicating the sample being measured is not a valid buffer.
To quit calibration and reset to default values
• After entering the calibration mode and before the first point is
accepted, it is possible to quit the procedure and return to the last
calibration data by pressing the /MODE button. The secondary LCD
displays “ESC” for 1 second and the meter returns to the normal
measuring mode.
• To reset to the default values and clear a previous calibration,
press the SET/HOLD button after entering the calibration mode
and before the first point is accepted. The secondary LCD displays
“CLR” for 1 second, the meter resets to the default calibration
and the “CAL” tag on the LCD disappears.
LCD Description
Battery
compartment
Liquid Crystal
Display
/MODE
button
SET/HOLD
button
Temperature
sensor
HI73127 pH
electrode
1
2
3
4
7
6
5
All rights are reserved. Reproduction in whole or in part is prohibited without the
written consent of the copyright owner, Hanna Instruments Inc., Woonsocket, Rhode
Island, 02895, USA.
Hanna Instruments reserves the right to m odify the design, construction, or
appearance of its products without advance notice.
Recommendations for Users
For a
single-point calibration
with buffers pH 4.01, 9.18 or 10.01,
the meter automatically accepts the calibration when the reading
is stable; the meter displays the accepted buffer, with the message
“OK 1”. After 1 second the meter automatically returns to the
normal measuring mode. If a single-point calibration with buffer
pH 7.01 (or pH 6.86) is desired, then after the calibration point
has been accepted the /MODE button must be pressed in order to
return to normal mode. After the button is pressed, the meter shows
“7.01” (or “6.86”) - “OK 1” and, after 1 second, it automatically
returns to the normal measuring mode.
Note: A two-point calibration is recommended for better
accuracy.
For a
two-point calibration
, place the electrode in pH 7.01 (or pH
6.86) buffer. After the first calibration point has been accepted,
the “pH 4.01 USE” message appears. The message is held for
12 seconds, unless a valid buffer is recognized. If no valid buffer is
recognized, then the “WRNG” message is shown.
If a valid buffer (pH 4.01, 9.18 or 10.01) is detected, then the meter
completes the calibration procedure. When the buffer is accepted,
the LCD shows the accepted value with the “OK 2” message, and
then the meter returns to the normal measuring mode.
Note: When the calibration procedure is completed, the “CAL”
tag is turned on.
Before using Hanna Instruments products, make sure that they
are entirely suitable for your specific application and for the
environment in which they are used. Any variation intro-
duced by the user to the supplied equipment may degrade the
meter' s performance. Avoid touching the electrode area. To avoid
damages or burns, do not put the meter in microwave oven. For
yours and the meter's safety do not use or store the meter in
hazardous environments.