Lovibond SD 50 Manual

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 solution.
M
4. Preparation of buffer
Press and hold (3 sec.) to start
calibration
solution
CAL 1 will flash
1. Fill a clean beaker with 20 ml distilled water.
2. Add one buffer tablet of the required value
Wait until
disappears
and shake or crush with a clean stirring rod
until the tablet dissolves.
Press 1 sec.
3. Allow to stand for about two minutes to
Calibration will take place ensure that the buffer is completely dissolved
and to allow any insoluble particles to settle.
4. Immerse the electrode into the buf-
CAL 2 will flash
fer solution and carry out calibration
(see 3. Calibration)
Exit for 1 point calibration or go to
5. Remove the electrode and rinse it tho-
2nd point calibration
roughly
6. Use the buffer solution only once
Rinse electrode with distilled
water and immerse into pH 4
Accuracy
L buffer solution.
The maximum tolerance of fresh buffer solu-
CAL 2 will flash
tions is ±0.05 pH.
Wait until disappears
5. Selection of pH and mV
mode
Press and hold (1 sec.)
Calibration will take place
CAL 3 will flash
Exit for 2 point calibration or go to
3rd point calibration

6. Recall Data

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
L H will appear on screen and
M
show type of calibration (1 point to
3 point calibration)

7. Delete Stored Data

8. Select Buffer System

Toggle to select mode
Note: mode mV does NOT show
ORP on the display, only millivolt.

9. Set Date/Time display

type
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
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
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
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