Apera Instruments LabSen 841 User Manual

®
LabSen electrochemical sensors are premium pH electrodes backed by proprietary sensor
technologies and components from Switzerland. LabSen 841
membrane, ideal for strong base solutions, and solutions with high temperature.
This probe has following features:
 Impact-resistant membrane (see the right picture), there is no danger of electrode
breakage during normal use.
 Tested in high temperature and strong base conditions, the service life of the probe
is 5 times longer than normal electrodes (test condition: 60℃, 1M NaOH solution).
 Blue gel inner solution, does not flow and will not cause a bubble.
 Silver ion trap reference prevents the contamination of the junction when testing
samples containing sulfides and proteins.

1. Technical Data

Measuring Range
Temperature Range
Shaft Material
Membrane Shape
Reference
Junction

2. Usage and Maintenance

2.1 Measurement suggestions:
(a) The electrode can measure strong base solutions lighter than 1mol/L (pH=14), with good
repeatability and stability. Stirring is recommended while measuring to speed up stabilization.
(b) Rinse the probe with deionized or distilled water after each measurement and store it in 3M KCL
solution.
(c) The performance of the electrode will be reduced if it measures strong base solution frequently.
Users may use 1% HF solution (about 0.5mol/L) to soak the probe for 5-8 seconds, then soak in
3M KCL solution for more than 2 hours, and then rinse with deionized or distilled water to
recondition the probe.
2.2 The connector of the electrode should be kept clean and dry. If contaminated, please clean it with
medical cotton and absolute alcohol and blow dry to prevent the short circuit of the electrode and
slow reaction of electrode.
2.3 The electrode's measuring tip should be soaked in the soaking bottle containing 3M KCL soaking
solution to keep the membrane hydrated and junction unblocked. When measuring, please unscrew
the bottle cap, pull out the electrode and rinse it with deionized or distilled water. After using, please
put the electrode back into the bottle and screw tight the cap. Clean the bottle and replace the
storage solution if the storage solution gets turbid and mildewed. The electrode should never be
soaked in purified water or buffer solution for long.
®
LabSen 841 Strong Base pH Electrode
User Manual
（2-14）pH
（0~100）℃
Lead-free Glass
Cylindrical
Silver Ion Trap
Ceramic
®
pH Electrode adopts a special H glass
Electrolyte
Soaking Solution
Electrode Dimension
Connector
Cable
3M KCL
3M KCL
（Φ12×120）mm
BNC
Φ3×1m