Appendix F: RESETTING PRESSURE SENSOR ZERO
If the pressure sensor will not zero as described in section 6.2 use the proce-
dure below to reset the zero point of the sensor.
WARNING :
Changing parameters in field calibration mode can adversely
affect the operation of your analyzer. Follow the instructions carefully.
1. With the analyzer running, press and hold the FUNC and Down Arrow keys for
approximately 2 seconds until a beep is heard. Press and hold the
Scroll/Enter Key down until ‘FILD CAL’ is displayed. The 712 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. 712 Display: ‘CAL’, ‘FLo’, ‘oPEn’. Action : Press the Func Key to bypass.
4. 712 Display: ‘CAL’, ‘FLo’, ‘CLos’. Action : Press the Func Key to bypass.
5. 712 Display: ‘CAL’, ‘LEAK’, ‘rEF’. Action : Press the Func Key to bypass.
6. 712 Display: ‘0ppm’, ‘Co’, ‘rEF’. Action : Press the Func Key to bypass.
7. 712 Display: ‘20.9%’, ‘o2’, ‘rEF’. Action : Press the Func Key to bypass.
8. 712 Display: ‘0.0mbar’, ‘0.0’, ‘oFS’. Action : Press the Scroll/Enter Key. After
the 10 second countdown is complete press the Scroll/Enter Key twice.
9. 712 Display: ‘2000’, ‘A-r’, ‘SEt’. Action : Press the Func Key to bypass.
10. 712 Display: ‘Auto’, ‘oFF’, ‘En’. Action : Press the Func Key to bypass.
11. 712 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 712 will return to normal operation
If the 712 continues to fail to zero the pressure sensor as described in sec-
tion 6.2, return your analyzer to Test Products International.
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Appendix E: MANUALLY INITIALIZING 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 calibration mode can adversely affect the
operation of your analyzer. Follow the instructions carefully.
1. Turn the analyzer on. When the countdown reaches 26, press and hold down
the Up Arrow, Scroll/Enter, and Down Arrow keys together for approximately
5 to 7 seconds. The analyzer will beep and “Fact Cal” will be displayed.
Release the keys. The analyzer 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. 712 Display: ‘CAL’, ‘FLo’, ‘oPEn’. Action : Press the Func Key to bypass.
4. 712 Display: ‘CAL’, ‘FLo’, ‘CLos’. Action : Press the Func Key to bypass.
5. 712 Display: ‘CAL’, ‘LEAK’, ‘rEF’. Action : Press the Func Key to bypass.
6. 712 Display: ‘0ppm’, ‘Co’, ‘rEF’. Action : Press the Scroll/Enter Key. After the
10 second countdown is complete press the Scroll/Enter Key twice.
7. 712 Display: ‘20.9%’, ‘o2’, ‘rEF’. Action : Press the Scroll/Enter Key. After the
10 second countdown is complete press the Scroll/Enter Key twice.
8. 712 Display: ‘0.0mbar’, ‘0.0’, ‘oFS’. Action : Press the Func Key to bypass.
9. 712 Display: ”0C”, “rEF”. Action : Press the Func Key to bypass.
10. 712 Display: “900C”, “rEF”. Action : Press the Func Key to bypass.
11. 712 Display: “120mbar”, “rEF”. Action : Press the Func Key to bypass.
12. 712 Display: “-120mbar”, “rEF”. Action : Press the Func Key to bypass.
13. 712 Display: ‘2000’, ‘A-r’, ‘SEt’. Action : Press the Func Key to bypass.
14. 712 Display: ‘Auto’, ‘oFF’, ‘En’. Action : Press the Func Key to bypass.
15. 712 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 712 will return to normal operation
If the 712 continues to fail to automatically initialize or this procedure fails
to initialize the sensors, return your analyzer to Test Products
International.
46
