Appendix G: MANUALLY INITIALIZING SENSORS
Manually Initializing the Carbon Monoxide and Oxygen Sensors
If the CO or O2 sensor fails to initialize, this procedure can be performed to
try and manually initialize the sensor(s).
WARNING :
Changing parameters in field calibration mode can adversely
affect the operation of your analyzer. Follow the instructions carefully.
1. Press and hold the Scroll/Enter Key down until ‘FILD CAL’ is displayed. The
709R will cycle through a 30 second countdown then display ‘CAL’, Air’,
gAS’.
2. Use the Up Arrow Key to select ‘Air’ by making it blink. Press the Scroll/Enter
Key to accept the selection.
3. 709R Display: ‘CAL’, ‘FLo’, ‘oPEn’. Action : Press the Func Key to bypass.
4. 709R Display: ‘CAL’, ‘FLo’, ‘CLos’. Action : Press the Func Key to bypass.
5. 709R Display: ‘0ppm’, ‘Co’, ‘rEF’. Action : Press the Scroll/Enter Key. After the
10 second countdown is complete press the Scroll/Enter Key twice.
6. 709R Display: ‘20.9%’, ‘o2’, ‘rEF’. Action : Press the Scroll/Enter Key. After the
10 second countdown is complete press the Scroll/Enter Key twice.
7. 709R Display: ‘2000’, ‘A-r’, ‘SEt’. Action : Press the Func Key to bypass.
8. 709R Display: ‘Auto’, ‘oFF’, ‘En’. Action : Press the Func Key to bypass.
9. 709R Display: ‘CAL’, ‘StoP’, ‘go’. Action : Press the Up Arrow Key to select
‘StoP’ by making it blink and press the Scroll/Enter Key to accept the selec-
tion. The 709R will return to normal operation
If the 709R continues to fail to automatically initialize or this procedure
fails to initialize the sensors, return your analyzer to Test Products
International.
3.2 Back View
Sample and Pressure Inlet Ports:
Connection for Gas Sampling Probe (see
3.4, 5.2, 6.2)
Connection for Mini Pump
Protection Filter
(see 3.4 & 6.2)
Connections for Pressure Tubing:
(see 3.4 & 6.2)
Calibration and Information Label:
Displays calibration information and
Displays serial number
Battery Compartment:
Holds batteries
Rubber Boot
Protects the instrument
Calibration and
Information
Label
Battery
Compartment
Rubber
Boot
Connection for
Mini Pump
Protection Filter
Connections for
Pressure Tubing
Sample and
Pressure Inlet
Ports
