Test Products International 708 - Manual (Page 11)

4. Turning On & Off
4.1 Turning On
Always: - Before turning on please ensure that the Mini Pump Protection Filter
assembly and the Temperature Sampling Probe complete with In-Line Filter or the
Tubing & In-Line Filter for Leak Detection are not connected to the Gas Sample
Port (see 2.2 or 2.4)
Press and hold down the Power Key and the TPI 708 will start its 30 second
countdown 'PURGE' will be displayed: - The instrument MUST be turned on in a
clean air environment as the 30 second purge will set the Carbon Monoxide level
to Zero and the Oxygen to 20.9%.
Ensure that the filters are clean and dry as dirty or wet filters will result in a loss
of flow rate and 'Lo Flo' will be displayed to inform you that filters should be
changed
During the last 20 seconds of the 30 second purge time the user can scroll
through the following Fuels: - Natural Gas, LPG, Light Oil, Heavy Oil, OPT1 :
Bituminous Coal, OPT 2 : Anthracite Coal, OPT 3: Coke, OPT 4: Butane, OPT 5:
Wood (Dry), OPT 6: Bagasse by pressing the Up Arrow Key to select the Fuel
they are working with. When desired fuel is displayed release the key, displayed
fuel is now selected.
After the 30 second countdown the instrument is ready to take Flue, Temperature,
Pressure or Leak Detection readings and Combustion Display 1 will be the first
display.
The 708 will auto power off if no keys have been pressed for 10 minutes and the
CO level is below 15ppm. This feature can be disabled see Appendix F.
The Scroll/Enter Key allows you to scroll through the combustion displays as out-
lined in section 5.3. The Func Key is used to select the 708 function mode and
allows you to set it to be a combustion analyzer, manometer, thermometer, or
combustible leak detector. In addition, the Func Key is used to access the date
and time display. See section 6 for more information on the Func Key.
4.2 Turning Off
Always: - Before turning off return the instrument to a clean air environment and
allow the Carbon Monoxide level to return to below 15ppm and the Oxygen level
to return to 20.9% (± 0.3%) Press the Power Key to turn the instrument off:-
NOTE Should you attempt to turn the instrument Off and the CO reading is above
15ppm then the instrument will remain On and a short Beep will be heard. The
Instrument can only be switched off if the CO is below 15ppm
The instrument has an auto shut off after 10 minutes should no keys have been
pressed for this period and as mentioned above that the CO is below 15ppm.
Should the CO be above 15ppm then the 10 minute auto shut off countdown will
not begin till the CO has gone below 15ppm
4.3 Activating the Backlight
The display backlight can be activated at any time by pressing and holding down
the Func Key for approximately 2 seconds. The backlight will automatically shut
off after approximately 20 seconds to preserve battery life.
NOTE: When selecting oil as fuel be sure to use the optional
oil filter (A773) or readings could become erratic. See
Appendix E for installation instructions.