Table of Contents
Advertisement
TROUBLE SHOOTING
Problem
Possible cause 1
Solution
Possible cause 2
Solution
Problem
Possible cause
Solution
Problem
Possible cause
Solution
Problem
Possible cause
Solution
If you encounter other problems and need scientific/technical assistance, please contact
sales@unisense.com for online support (we will answer you within one workday)
A high and drifting signal
Gas bubbles are present inside the sensor tip due to a short circuit
or electrical shock .
Degas water by boiling and subsequent cooling or by 10 minutes
of vacuum treatment . Immerse the sensor tip for 20 min in the
degassed water . Repeated or prolonged treatment may be
necessary .
The sensor tip is broken .
Replace the H
S microsensor .
2
A slow response .
Insoluble compounds deposited on the sensor tip .
Rinse with 96% ethanol, rinse with 0 .01 M HCl and rinse with
water .
Measurements in two environments with equal H
trations exhibit different signals .
The light intensity differs between the two environments, causing
different light interference .
Try to keep constant light conditions and interpret data with the
light interference in mind .
Signal unstable fluctuatung if the set-up is touched or equipment
is introduced in the medium
Electrical disturbance through the tip membrane
Ground the set-up by connecting the reference plug on the
picoammeter (blue plug) with the medium you are measuring in .
Use the provided blue grounding wire . Leave the other end with
approximately 1 cm un-insulated wire (If you are measuring in e .g .
a sediment, just put the open wire end in the water column) .
S concen
2
23
Advertisement
Table of Contents
