COSA Xentaur Xentaur HDT - Manual (Page 20)

Section 3: Instrument
page 13
3.1 Precautions using the HDT
The HDT uses state-of-the-art microelectronics to provide a
miniature full functioning transmitter. The user should con-
sider the following precautions when using any sensitive
electronic device.
•
Do not install the unit near heat sources such as radia-
tors or air ducts.
• Do not install the unit in places subject to extreme
mechanical vibration or shock. If this is not avoidable,
use resilient mounting. If in doubt, call your representa-
tive.
• Observe the appropriate electrical safety codes and reg-
ulations.
3.1.1 Electromagnetic Compatibility Considerations
The HDT has been designed and verified by testing to meet
the requirements of the EC Council EMC Directive 89/336/
EEC, for Industrial, Scientific & Medical equipment. The
sensor and the 4-20mA loop are electrically connected,
however they are isolated from the HDT housing and sam-
ple cell fitting threads, refer to Appendix D. Please consider
the following electromagnetic interference issues during
installation:
•
In order to provide an acceptable noise environment for
the HDT or any other digital equipment in the proximity
of switching inductive loads, it is recommended that
there be varistors placed across the inductors to keep
down the high voltage spikes during transitions.
• Circuitry activated by relay contacts should account for
the contact bounce, one simple debouncing method is
placing a capacitor across the relay contacts.
• AC power wiring should be routed as far away from the