Crison 50 48 Manual De Instrucciones página 10

Multisensor 50 48
Introduction
The 50 48 consists of a pH electrode, a EC sensor, a Pt electrode and
a temperature sensor, all integrated into a unique body.
SAFETY NOTE
Before use with hazardous substances, find out about the relevant
hazards, protective measures, and what to do in an emergency.
Electrode preparation
Remove the storage protector by unscrewing
Before using the sensor for the first time or after not being in use for
long time, it is recommended to immerse the electrode in ethanol
for 15 s. Afterwards, rinse with distilled water.
MP-8 connector (IP 67). Connect and disconnect to the instrument
by pushing/pulling. Do not unscrew it.
Calibration
Multisensors must be calibrated with standard solutions before
measurement.
See multimeter instruction manual.
Measurements. Recommendations
• During calibration and measurement the buffers, standards and
samples must be slightly stirred.
In fi eld, these type of sensors allow stirring the sample directly
holding it by the handle.
• The sample must cover the membrane, the Pt wire, the EC elec-
trodes and diaphragm
tween them.
• After measurement, immediately rinse the sensor with distilled
water. Dry it with soft tissue, only by contact, without rubbing.
• Between measurements the membrane should be immersed in
aqueous solution. The most appropriate place is the storage pro-
tector with some KCl 0.01M (conductivity standard 1413 µS/cm).
Before measurement rinse with distilled water.
WARNING
• Do not leave the multisensor immersed in distilled water.
• Do not bend the multisensor body, the interior is glass made.
• Do not bend the cable on the handle level.
• Never unscrew the MP-8 connector.
Maintenance
• Maintain the membrane's surface
or knocking.
• When an electrode gets dirty, the simply rinsing with distilled wa-
ter is not suffi cient. The most suitable cleaning solution is which
acts in a most selective way over the contamination.
• Re-hydration. A "dry" electrode recovers by immersing in di-
luted HCl solution for several hours.
Life of an electrode
The average life expectancy of the multisensor due to the pH mem-
brane is approximately one year. The multisensor's life depends on
the working conditions.
A multisensor used for more than six months that does not response
appropriately after regeneration, must be replaced by a new one.
If a multisensor has too short life span, less than three months,
ask us about it. Probably the multisensor is not suitable for the ap-
plication.
10
. Verify that there are not air bubbles be-
clean. Protect it from friction
.