38
5.
Press 'CAL' to calibrate.
Calibration is now complete.
Tg - Ta: A calculation of the temperature rise in the combustion process. The units i.e °C/°F can be
changed in the Setup menu.
6.3
METHOD FOR ZERO CALIBRATION
The Firetron 1000 automatically performs a zero calibration each time it is switched on. A zero cali-
bration may also be initiated by manually selecting the 'Recalibrate' option from the main menu. The
ABORT function key allows early termination of the Zero calibration cycle. The completion or abor-
tion of this cycle records the voltage outputs of the cells as exposed to fresh air. The cell zero values
are displayed under the 'Diagnostics' menu.
IMPORTANT: The fresh air used for zero calibration is drawn through the
sample probe. Remove the probe from the flue gas stream before any recalibra-
tion is undertaken. The cell zero values are displayed under the Diagnostics
menu.
NOTE: Cell zeros should be virtually 0.0V (offset should be less than + 20mV) except: the Oxygen
sensor (span value) which should be around 1.6V to 2.0V.
6.4
SUGGESTED METHOD FOR SPAN CALIBRATION
The individual gas sensors can be calibrated using the appropriate calibration gas. This applies to all
gases except Oxygen. It is necessary to have information on the individual calibration gases i.e. type
and concentrations. This information has to be entered to perform an accurate calibration of the sen-
sors. It is recommended that a zero calibration (Refer to Section 6.3) is performed immediately prior
to performing a gas span calibration.
1.
Follow all precautions for using hazardous gases.
2.
Assemble the following equipment: Certified Calibration Gas with Pressure regulator; Suitable
gas pipe; 'T' junction connector; Bubbler or water-filled beaker or similar.
3.
On the Firetron 1000 select 'Manual Cal'.
EXIT
F1
F2
F3
F4
AMBIENT XXC
Use cursor keys to enter current
ambient temperature
Press "ENTER’ when readly to cal.
EXIT
F1
F2
F3
F4
Press ‘CAL’ to calibrate
PROBE:
XXX.XX
°
C
AMBIENT
XXX.XX
°Χ
