UNISENSE HYDROGEN SENSOR, User Manual

Page: 14 / 24

14
MEASUREMENTS
Hydrogen sensors can be used for a wide variety of
measurements (see our web page for further information www .
unisense .com) . The most common use of hydrogen sensors is for
making profiles in e .g . sediment or animal tissue where a high
spatial resolution is wanted, or for hydrogen measurements in
water samples .
m
ounting of tHe sensors
Although the Unisense microsensors are made of glass, the
tip is flexible and can bend slightly around physical obstacles .
The sensor is thus rather sturdy in the longitudinal direction .
However, large obstacles like stones or lateral movements of the
sensor when the tip is in contact with a solid substrate may cause
the tip to break .
Furthermore, due to the small size of the microsensor tip and
to the steepness of gradients in many environments, even a
displacement of the sensor tip of few microns may change its
environment .
Therefore, we recommend that measurements should be
performed only in a stabilized set-up free of moving or vibrating
devices . We recommend the Unisense lab stand LS and the
Unisense micromanipulator MM33 (MM33-2 or MMS) for
laboratory use . For in-situ use, we recommend our in situ stand
(IS19) and a micromanipulator .
e
lectrical noise
The signal of the microsensor is very small (10
-13
to 10
-10
ampere) .
Although both the Unisense picoammeters and the Unisense
Hydrogen microsensors are very resistant to electrical noise from
the environment, electrical fields may interfere with the sensor
signal . Therefore we recommend that unnecessary electrical/
mechanical equipment is switched off and the sensor or wires are
not touched during measurements and signal recording .
Micromanipulator