E Instruments 4400, Руководство пользователя

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@IST01530EEJ 01 917 5A0 19 041 1
Keypad
Adhesive polyester keypad with preformed keys featuring main control functions (pos. in Fig. 2.2).
Display
Backlit 128 x 64 pixel LCD display (pos. in Fig. 2.2), with 8 lines x 20 characters available. Allows the user to
view the measured parameters in the most comfortable format; a Zoom function displays the measured values in
magnified form.
CAUTION: If the instrument is exposed to extremely high or extremely low temperatures, the quality of
the display may be temporarily impaired. Display appearance may be improved by acting on the contrast
key.
Printer
Internal 24-column impact printer for use with ordinary Non-Thermal paper, (pos. in Fig. 2.2). Thanks to the
use of ordinary paper and an ink ribbon, running costs are lower and the printout is more legible and longer-
lasting when compared to printouts obtained by other systems, besides being much more resistant to heat.
The print menu is accessed by pressing the relative key and, besides enabling read-out printing, the menu also
allows you to modify print settings and to advance the paper manually so as to facilitate paper roll replacement.
Rechargeable Battery Pack
The instrument is provided with a 12VDC, 2A power supply pack to charge the internal batteries.
The socket for connecting the battery charger to the instrument is shown as item in Fig. 2.2. Once the charge
is started the display turns on and shows the charge status.
Serial connector (Mini Din 8-pole)
In of Fig.2.2 we find the socket of the serial cable for connecting the instrument to an external probe, for
example, to the draft gauge (optional), or to the ionization current probe (optional).
Mini/USB connector
In of Fig.2.2 we find the socket of the serial cable for connecting the instrument to a personal computer.
Sample pump
The sample pump located inside the instrument is a DC-motor-driven diaphragm pump, powered by the
instrument, and is such as to obtain optimal flow of the sampled gas being analyzed.
Flue Sampling Probe
Stainless steel probe with plastic handgrip (see of Fig.2.2). The Standard Length of the steel probes is 12
inches (300 mm). Other available lengths are 180 mm, 750 mm and 1000 mm with adapter cone for the flue
hole, diameter 8-22 mm. A flexible probe is also available with a 300 mm long tip, for measuring inside flues
where the fumes picking point is difficult to reach. All probes have a nominal outside diameter of 8 mm.
Connection to an analyzer via a 3-meter rubber hose and replaceable condensate separator and fine dust filter
unit (see of Fig.2.2).
Measurement cells
The instrument uses pre-calibrated gas sensors of the long-lasting FLEX-Sensor series for measuring oxygen
(O
2
), carbon monoxide CO (compensated in hydrogen H
2
), nitrogen oxide (NO), nitrogen dioxide (NO
2
) and
sulphur dioxide (SO
2
). An automatic internal device dilutes the concentration of CO when the instrument measures
high concentrations. The diluting system also allows the CO sensor measuring range to be extended up to 50,000
ppm (for full scale 8,000ppm sensor). The valve for the optional automatic fast autozero lets the operator turn the
instrument on with the probe inserted in the flue. Up to 4 alarms can be programmed with visual and acoustic
warning for the same number of measuring parameters.
The measuring cells are the electrochemical type. The UNI 10389-1 standard prescribes that the instrument must
be calibrated once a year by an authorized laboratory to issue calibration certificates. When the cells are flat they
can be replaced easily by the user without having to send the instrument away and without complicated
calibration procedures requiring sample mixtures as they are supplied already calibrated.
E Instruments does, however, certify measurement accuracy only when a calibration certificate has been issued
by its own laboratory or by an authorized laboratory.
Temperature sensors
Flue gas temperature is measured by means of a thermocouple inserted in the tip of the probe.
The thermocouple is connected to the instrument via a compensated cable (pos. in Fig. 2.2.) housed in a
special seating in the rubber hose of the sample probe.
Connection to the instrument is achieved via a temperature-compensated male connector.
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