Teledyne 8800T - Trace moisture analyzer - transmitter - Manual (Page 17)

Section 3: Instrument
page 13
3.1 Precautions using the 8800T
The 8800T uses state-of-the-art microelectronics to provide
a miniature full functioning instrument. The user should
consider 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
• If weather proofing is required consult your representa-
tive for an optional cover.
3.1.1 Electromagnetic Compatibility Considerations
The 8800T has been designed and verified by testing to
meet the requirements of the EC Council EMC Directive
89/336/EEC, for Industrial, Scientific & Medical equip-
ment. The sensor ground (8800T housing) is isolated from
the 4-20mA loop, however they are also shunted with a
2000pF capacitor and a 33V Transient Voltage Suppressor;
this prevents electrostatic buildup, noise pick-up, and in
conjunction with the internal fuse protects the instrument
from over-voltage inputs. Please consider the following
electromagnetic interference issues during installation:
•
In order to provide an acceptable noise environment for
the 8800T or any other digital equipment in the proxim-
ity of inductive loads, it is recommended that there be
varistors placed across the inductors to keep down the
high voltage spikes during transitions.