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SD 50
pH
7. Delete Stored Data
Recall Data (see 6.)
Press and hold (3 sec.)
CLEAR will flash
Confirm deletion of stored data
This erases all stored data
Automatic return to normal display
8. Select Buffer System
Power ON
Press and hold (3 sec.)
Press 1 x
Current pH system will flash
Press to confirm
Toggle to change / select (7.00
or 6.86)
Save and exit
9. Set Date/Time display
type
Power ON
Press and hold (3 sec.)
Press 4 x
Date is displayed
Confirm
Toggle to 12 hour clock (am/pm) or
24 hour clock
Save and exit
4. Preparation of buffer
solution
1. Fill a clean beaker with 20 ml distilled water.
2. Add one buffer tablet of the required value
and shake or crush with a clean stirring rod
until the tablet dissolves.
3. Allow to stand for about two minutes to
ensure that the buffer is completely dissolved
and to allow any insoluble particles to settle.
4. Immerse the electrode into the buffer solution and carry out calibration
(see 3. Calibration)
5. Remove the electrode and rinse it thoroughly
6. Use the buffer solution only once
Accuracy
The maximum tolerance of fresh buffer solutions is ±0.05 pH.
5. Selection of pH and mV
mode
Toggle to select mode
Note: mode mV does NOT show
ORP on the display, only millivolt.
6. Recall Data
Power ON
Press and hold (3 sec.)
Most recent memory setting will
flash
Press to recall
Most recent memory setting is
displayed
Toggle to other stored values
Press to exit
Press and hold (3 sec.) to start
calibration
CAL 1 will flash
Wait until
disappears
Press 1 sec.
Calibration will take place
CAL 2 will flash
Exit for 1 point calibration or go to
2nd point calibration
Rinse electrode with distilled
water and immerse into pH 4
L
buffer solution.
CAL 2 will flash
Wait until
disappears
Press and hold (1 sec.)
Calibration will take place
CAL 3 will flash
Exit for 2 point calibration or go to
3rd point calibration
Rinse electrode with distilled
water and immerse into pH 10
H
buffer solution
CAL 3 will flash
Wait until
disappears
Press and hold (1 sec.)
Calibration will take place
3 point calibration is finished
LMH
will appear on screen and
show type of calibration (1 point to
3 point calibration)
1. Power ON/OFF
Press briefly
If ! is displayed,
press to deactivate
Automatically turns off after
8 minutes of inactivity
Press and hold (3 sec.) to turn the
instrument off
Press to activate / de-activate
backlight
2. Taking a reading
Remove protective cap and immerse
the instrument into the sample to be
measured so that the instrument is
submersed to the sealing ring level.
Reading is displayed
Press briefly ! to freeze / unfreeze
Press and hold (3 sec.) to store data
While pressing button, memory
listing (e.g. 01) appears
3. Calibration
Rinse electrode thoroughly with
distilled water before using in each
buffer solution.
Re-calibrate according to individual
recommendations.
Use Lovibond
®
Standard Solutions or
pH buffer tablets in accordance with
the kit manual (see 4.)
Remove protective cap from the
probe. Turn ON, rinse electrode
with distilled water and immerse
the probe into pH 7
M
solution.
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11. Set Temperature
System
Power ON
Press and hold (3 sec.)
Press 3 x
Temperature system will flash
10. Set Date and Time
Power ON
Select Date/Time type first (see 9.)
Press and hold (3 sec.)
Press 2 x
Time will flash
Confirm
Select minutes
To increase
To decrease
Save and change to hours
To increase
To decrease
Save and change to Year
To increase
To decrease
Save and change to Day/Month
To increase
To decrease
Save and exit
Replacement of batteries
pH Buffer
Article No.
72 12 50 pH buffer-set, each 90 ml (25°C)
4.00/7.00/10.00
72 12 52 pH buffer 4.00 (25°C) 1 litre
72 12 54 pH buffer 7.00 (25°C) 1 litre
72 12 56 pH buffer 10.00 (25°C) 1 litre
51 56 00 buffer tablets pH 10 100 pc.
51 56 01 buffer tablets pH 10 250 pc.
51 56 10 buffer tablets pH 7 100 pc.
51 56 11 buffer tablets pH 7 250 pc.
51 56 20 buffer tablets pH 4 100 pc.
51 56 21 buffer tablets pH 4 250 pc.
Warranty
The waterproof SD 50 is warranted to be free
from manufacturing defects for 2 years and
electrode (probe) module for 6 months.
Error Code and Actions
Description Range Action
Electrode not installed Thermistor: Install or replace
or faulty 0.5~100 kΩ electrode
pH out of range 0~14 pH Use new solution
or replace electrode
Electrode is not touching the Immerse electrode
sample solution into solution
Temperature out of 0~60 °C Bring solution to the
range temperature within range
Offset out of range -60~60 mV Use new buffer or
replace electrode
Slope out of range 85%~115%, Use new buffer or
50~68 (mV/pH) replace electrode
mV out of range -1800~1800 mV Use new solution
SD 50 pH Specications/
Features
1 Operating range: 0-60 °C, 0-14 pH,
-1800 mV to +1800 mV
2 pH resolution 0.01 pH. accuracy
± 0,05 pH
3 Selectable buffer system (pH 7.00 or
pH 6.86): 1-, 2- or 3-point-calibration
with auto-recognition
4 Automatic Temperature compensation
5 mV resolution 0.1 mV within
±1000 mV and 1 mV over
±1000 mV, accuracy ±20 mV
6 Temperature resolution and accuracy
0.1 °C, selectable °C or °F
7 T ime and date display with 25 sets of
data storage (non-volatile)
8 22x22 mm LCD display, with backlight
9 2 x CR 2032 batteries
10 Battery life > 25 hr (continuous use,
backlight OFF), low battery indicator on
LCD display
11 Auto-power off to save battery-life
(8 minutes non-use)
Instruction manuals available in further languages, visit www.lovibond.com • Printed in Germany 11/13
Storage of electrode
The sponge in the protective cap should be
moistened with tap water.
Store electrodes dry when instrument is not
being used for longer periods.
Moisten electrode in tap water for some hours
before initial use and after dormant periods.
1 2 3
4 5 6
Replacement of electrode
new electrode
Confirm
Select Temperature style (°F/°C)
Save and exit
Accessories
19 50 017 Battery CR 2032 (2 Batteries
required)
19 48 20 pH replacement electrode
38 48 01 Beaker, 100 ml
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