VICI D-2-I - Manual (Page 7)

3
dynamic range whereas, in the D-2, a unique system of feedback to the
bias electrode is employed. It operates by comparing the detector output
current to a reference value and changing the bias voltage to maintain the
detector current at the reference value. (E.g., in the presence of an electron-
capturing compound, the bias voltage must be raised to maintain constant
detector current.) The bias voltage, scaled to an appropriate range, is the
linearized output signal representing the concentration of the capturing
compound. This results in a linear dynamic range of more than five orders
of magnitude. The feedback is incorporated in such a way that it is by-
passed in the PDHID mode.
Safety Notes and Information
Symbols
HIGH VOLTAGE
Voltages presenting the risk of electric shock are present in
several places in the equipment. Avoid contact with hazard-
ous live parts. Do not probe into openings or attempt to
defeat safety mechanisms.
HOT SURFACE
The surface of the detector body may be hot while in op-
eration (possibly in excess of 250°C). Caution should be
observed.
ATTENTION
Refer to the manual.
PROTECTIVE EARTH
This internal connection provides protection against electric
shock from mains voltages and should not be removed.
Installation Category
This equipment has been designed for installation category (overvoltage
category) II, pollution degree 2. It has been approved for use in heavy
industrial environments. It has been tested to EN Class A limits and may
not be used in residential environments.
Safety
This instrument has been designed and tested in accordance with the
product safety standard, EN61010. It has left the factory in a safe
condition. This instruction manual contains important information and
warnings which must be followed by the user to insure safe operation and to
retain the instrument in a safe condition. The case, chassis, and measuring
terminals are connected to the protective earth contact of the mains inlet.
The instrument operates with a three-conductor power cord having a
protective earthing conductor and a plug with an earthing contact. The
Introduction