Test Products International 708 - Manual (Page 13)

COMBUSTION ANALYSIS (Continued)
5.2 Procedure
1. Turn the 708 on as outlined in section 4.1. At any time you can activate the
Backlight by holding down the Func/Backlight Key for 2 seconds. The back-
light will automatically shut off after 20 seconds to preserve battery life.
2. Ensure you have connected the Mini Pump Protection Filter assembly and
Temperature Sampling Probe complete with In-Line Filter to the Gas Sample
Port (see 3.2 or 3.4) and the 'K' Type Thermocouple Plug into Thermocouple
(T1) Socket (see 3.4). The GK11M ambient air temperature probe must be
connected to the (T2) socket. (refer to figure below for correct hookup)
WARNING: - Ensure that the In-Line Filter hangs in a vertical position when
readings are being taken, particularly if water is visible. Failure to comply may
result in damage to the instrument.
WARNING: - There is ONLY one correct way to connect the 'K' type thermo-
couple plug into the socket (see 2.4). Forcing the plug into the socket the
wrong way round may result in damage to the instrument.
3. Insert the flue probe into the test location of the device under test. The
probe tip should be in the middle of the flue pipe or exhaust stream. Refer to
figures 1 through 3 for typical test locations.
Mini Pump
Protection Filter
Assembly
Ambient Air
Connection (T2)
GK11M Probe
Flue Probe
Connection (T1)
In-line Filter
Assembly
Flue Probe
Tubing
5. COMBUSTION ANALYSIS
5.1 Overview
Testing for carbon monoxide, oxygen, and stack temperature is very important to
the overall safety and efficiency of heating equipment. The following guidelines
and descriptions are generic and meant to provide you with a basic understand-
ing of combustion testing. TPI always recommends you contact the manufacturer
of the device under test, obtain information specific to the device, and follow the
procedures and safety guidelines for performing tests and affecting repairs.
In general, for most applications flue gas samples should be taken prior to the
draft diverter or any other opening that allows room air to enter the system. This
prevents room air from mixing with gases in the flue and diluting the test sample.
To ensure accurate and consistent combustion tests, it is important gas and tem-
perature samples be taken at the same location. This is easy with the TPI flue
probe because the temperature sensor is an integral part of the probe.
Prior to taking a sample, the device under test should be on and operating.
Putting the flue probe in the sample area prior to starting the device may cause
saturation of the sensors due to the higher initial concentration of carbon monox-
ide that may be encountered upon start up. If this happens, allow your analyzer to
purge in fresh air until the carbon monoxide level returns to 0 ppm and the oxy-
gen level returns to 20.9%. This may take more than an hour depending on how
saturated the sensors are.
The included figures show locations for performing tests on commonly encoun-
tered equipment. Remember to consult with the manufacturer of the device under
test for specific test information.
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.