11
K800000000SE 023942A0 080914
Keypad
Silicone rubber keypad 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.
Battery charger socket
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 the combustion air probe.
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 analysed.
External suction unit
Stainless steel probe with plastic handgrip (see of Fig.2.2). Length of the steel probe is 180 mm, 300 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 analyser via a 3-metre rubber hose and replaceable condensate separator and fine dust filter
unit (see of Fig.2.2).
Measurement cells
The instrument uses precalibrated gas sensors of the long-lasting FLEX-Sensor series for measuring oxygen (O
2
),
carbon monoxide CO
(high immunity to Hydrogen - H
2
) and nitrogen oxide (NO). 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 authorised
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.
Seitron does, however, certify measurement accuracy only when a calibration certificate has been issued by its
own laboratory or by an authorised 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 means 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 means a temperature-compensated male connector.
The cold junction is compensated by a Pt100 resistance thermometer which measures the temperature at the
thermocouple connector (pos. in Fig. 2.2).
The type K thermocouple (nickel/nickel chromium) permits continuous measurements up to 800°C. If special-
purpose probes are used, the instrument is able to measure temperatures as high as 999.9°C.
A Pt100 resistance thermometer located inside the instrument measures the internal temperature; this sensor is
also used to measure the ambient temperature.
Should the user want to measure the combustion air temperature directly in the intake duct, the optional remote
Pt100 sensor must be used - this measurement is recommended for more precise calculation of plant efficiency.
Remote temperature probe
The temperature probe consists of a Pt 100 probe, complete with 2 m cable and 7.5/17 mm pit adapter
(pos. in Fig. 2.2). This probe is used to measure the combustion air temperature, within a range of -10°C to
+100°C, when boiler efficiency is to be calculated precisely.
M
B
A
C
D
E
O
N
1
2
3
4
5
6
7
8
L
F
