Conditions on site
CLP
A03616_04_YI0_02
HBM: public
11
5
Conditions on site
Protect the force washer from moisture or weather conditions such as rain,
snow and ice, as well as salt water.
CAUTION
Measurement errors (forces too small or too large) occur if the insulation resis
tance is less than 10
11
ohms. This could lead to measurement errors from the
measuring system, and therefore danger for the operating personnel of the sys
tem in which the transducer is installed.
To obtain a sufficiently high value, all the plug connections have to be kept
thoroughly clean. A strong (greater than 10 N/min at room temperature in ther
mal equilibrium) positive or negative signal drift of the output signal without any
force applied indicates insufficient insulation resistance. The plug connection
contacts should therefore be cleaned with a clean, lint-free cloth and a cleaning
agent (pure isopropanol).
Protect the transducer plug against pollution and under no circumstances touch
the charge amplifier connectors (plug face) with your fingers. The supplied
cover should always be in place when the connection is not in use.
5.1
Ambient temperature
The influence of the temperature on the sensitivity is low and can be ignored.
However, thermal stresses will occur in the force washer if it is heated un
evenly, and these will generate an output signal. The following measures im
prove the stability of the measurement:
S
Make sure that the temperatures of the sensor and the components used to
pre-stress the sensor are as even as possible before starting to measure.
This applies in particular to long measurements and when adjusting the
force washers
