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1.0
INTRODUCTION
1.1 General Description of the Combustion Analyser
The design of the handheld combustion analyser "CHEMIST 400" is clean and ergonomic with an extremely clear
and user-friendly keypad.
"CHEMIST 400" immediately suggests just how even the most sophisticated engineering can give life to an
incredibly comfortable and easy to use work instrument.
Devised to analyse flue gases, monitor the pollutants emitted and measure environmental parameters,
"CHEMIST 400" uses two electrochemical cells that provide the oxygen and carbon monoxide values while a
third cell is used to measure the pollutants NO and NOx.
The most complete version can house a fourth sensor for measuring NO2, SO2 and CxHy. CO,NO,NO2 and
SO2 measuring sensors are also available with a reduced measuring range, with a resolution of 0.1 ppm and
better accuracy.
Two external sensors measure the environmental parameters; it is also possible to measure flue draught and
carbon black and, with the measuring range of up to 200mbar, system pressure and pressure in the combustion
chamber can be measured and the pressure switches checked.
"CHEMIST 400" is designed for seven main types of combustible substances, among which natural gas, LPG,
Diesel fuel and fuel oil. Another 16 types of which the chemical composition is known can be entered in its
memory. "CHEMIST 400" functions include storing and averaging the measurements acquired, printing the
results (on ordinary rolls of paper) and connecting to the computer for filing the data, using a USB connection.
The memory can store 300 complete analyses and the data downloaded onto a PC by means of dedicated SW
and a mini-USB serial communication cable. It is also interesting to note that "CHEMIST 400" has just one "Li-
Ion" rechargeable battery pack used for powering the instrument and the printer; it also has a luminous and large
(42 x 60mm) LCD display boasting excellent readability thanks to its backlighting and also to the zoom function.
Another characteristic that distinguishes it from other similar products in the market is the fact the power supply
that comes with the product can carry out the dual function of battery charger and power supply for the
instrument which means the user can carry out analyses even if the batteries are completely flat.
Another important function is the possibility of carrying out an autozero cycle with the probe inside the stack,
exploiting a sophisticated flow deviation system.
As far as concerns maintenance, it is useful to know that the user can replace the sensors himself without having
to send the instrument back to the technical assistance centre: in fact, the sensors are pre-calibrated and
"CHEMIST 400" does not need recalibrating.
Moreover:
Operator interface: user-friendly - so much so that it can be used without the instruction manual.
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Luminous and large LCD display: easy readability thanks to the Zoom function and effective backlighting.
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Built-in impact printer using ordinary paper: maximum readability and duration in time and to heat.
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One battery pack: rechargeable for powering the instrument and the printer, indicating the charge level and is
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accessible from outside.
Pneumatic input connectors (gas and pressure/draught) staying inside the profile of the instrument: for
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greater resistance to knocks.
Precalibrated sensors, directly replaceable by the user.
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1.2 General features of the Flue Gas Analyser
CHEMIST 400 is a portable flue gas analyser that was meticulously designed to meet statutory requirements and
specific customer demands. It may be provided in a rugged ABS carry case or waterproof shoulder bag.
The instrument contains one single board with all the basic circuitry, pre-calibrated measuring cells, sampling
pump, membrane keypad, backlit graphic LCD display, high-capacity rechargeable Li-Ion battery pack and plain
paper impact printer. The two halves of the case are firmly secured by eight screws on the rear of the instrument.
The pneumatic path and measuring cells inclusive of electronic micromodule are located on the back side of the
plastic case and are easily accessed for maintenance and replacement by removing the cover carrying the
functions label.
The roll of paper is positioned at the upper end on the rear and may be easily replaced by removing the snap-on
flap.
The pneumatic connectors for flue gas sampling and pressure/draught measurement as well as the flue gas
thermocouple connector are installed on the lower end of the instrument.
On the right hand side are located the Pt100 combustion air probe and the mini-USB connectors.
On the left hand side there is a plug for connecting the external power supply and an 8-pin min-DIN for serial
interface or Deprimometer (optional).
The user interface consists of a constantly active backlit graphic LCD display and membrane keypad. Menu
screens and all user messages can be set in the language of the country where it is used; this can be selected
through the menu in one of the available ones. Use of the analyser is simplified by symbol keys that give direct
access to main instrument functions. Shifting between the various menu screens is easy and user-friendly thanks
to four cursor keys, an '
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' key and '
' key.
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