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ECA 450 Maintenance
Instruction 0024-9400
65
4.4.1 O
2
, CO, NO, NO
2
, & SO
2
Sensor Replacement
All sensors, with the exception of the HC sensor, are replaced in a similar
manner. Do the following to replace either the O
2
, CO-LO, CO-HI, NO, NO
2
,
or SO
2
sensor.
Material Required:
• Medium Phillips screwdriver
• Replacement sensor (refer to Section 6.1)
Procedure:
1. Remove two screws from sensor-cover plate, and then remove plate to
gain access to sensor compartment. See Figure 4-3.
2. Unplug the printed circuit board from the sensor being replaced by
carefully pulling the board straight up.
3. Note position of sensor pins; then release sensor from its bayonet-type
holder by turning the sensor counterclockwise. Remove sensor by pulling
it straight up.
Note: Discard an old sensor in accordance with local and federal
hazardous waste disposal laws.
4. Remove replacement sensor from its plastic canister. Note that the CO-
LO, CO-HI, SO
2
, and NO
2
sensors have a shorting-spring installed
between two of their pins. Remove and discard this spring before
installing the sensor.
5. Insert sensor into its holder and turn clockwise to lock in place. Ensure
that the sensor pins are positioned as was noted in Step 3.
6. Plug the circuit board, which was removed in Step 2, into the top of the
sensor.
Important! When replacing the O
2
sensor, be sure that the “+” sensor pin
plugs into the circuit board socket that is also marked “+”. Polarity
markings are located on the bottom of the printed circuit board and the
sensor.
7. Install sensor-cover plate that was removed in Step 1.
8. Allow the sensor that was just installed time to stabilize in the circuit
before continuing with this procedure. Stabilization time for all sensors
(except for the NO sensor) is about 1 hour. An NO sensor requires
approximately 4 hours to stabilize.
9. Place analyzer in an area of fresh air and turn it ON. After its warm-up
cycle completes, observe that no sensor error messages should have
appeared.
10. Calibrate the new sensor per Section 3 (except the O
2
sensor which does
not require calibration).
- Model 450 1
- Notice: 2
- Table of Contents 3
- Contents ECA 450 4
- 1 Introduction 5
- 1.3 Technical Data 6
- Accuracy: 7
- 4 Instruction 0024-9400 8
- 1.4 Operation Overview 9
- Introduction ECA 450 10
- 6 Instruction 0024-9400 10
- 1.5.3 POWER (AC Adapter) 11
- 1.5.6 OPT (Option) 11
- 8 Instruction 0024-9400 12
- CALIBRATE 13
- 10 Instruction 0024-9400 14
- 2 Operation 15
- 2.3 Fuel Selection 16
- ECA 450 Operation 17
- Instruction 0024-9400 17
- Operation ECA 450 18
- 14 Instruction 0024-9400 18
- 2.7 Saving Test Data 20
- 2.8 Clearing Memory 20
- 18 Instruction 0024-9400 22
- 2.10 Printing Data 23
- 20 Instruction 0024-9400 24
- 2.12 Data Logging 26
- 24 Instruction 0024-9400 28
- Line 1: Column Headings 30
- 2.14.1 Thermocouple Method 31
- 28 Instruction 0024-9400 32
- 2.14.3 Thermometer Method 33
- 30 Instruction 0024-9400 34
- 2.16 Statistics Mode 36
- 34 Instruction 0024-9400 38
- 2.17.1 Temperature Units 40
- 2.17.2 Pressure Units 40
- 2.17.3 Pollution Units 40
- 2.17.4 Language 41
- 2.17.5 Date 41
- 2.17.6 Time 42
- 2.17.7 O 42
- Reference 42
- 2.17.8 Test ID 43
- 40 Instruction 0024-9400 44
- 42 Instruction 0024-9400 46
- 2.17.9 Display Timeout 47
- 2.17.10 Display Format 47
- 44 Instruction 0024-9400 48
- 2.17.11 Primary Air 49
- 2.17.12 Data Logging 49
- 2.17.13 Statistics 49
- 2.17.14 User Name 49
- 2.17.15 Keypad Sound 50
- 2.17.17 Print Pressure 52
- 2.17.18 Information 52
- 3 Calibration 53
- PRESSURE 54
- ECA 450 Calibration 55
- Calibration ECA 450 56
- 52 Instruction 0024-9400 56
- 3.7 Calibrate HC Sensor 58
- 3.8 Calibrate CO-LO Sensor 59
- 56 Instruction 0024-9400 60
- 3.9 Calibrate SO 61
- Sensor 61
- 3.10 Calibrate NO Sensor 62
- 3.11 Calibrate NO 63
- 3.12 Calibrate CO-HI Sensor 64
- 4 Maintenance 65
- Maintenance ECA 450 66
- 62 Instruction 0024-9400 66
- ECA 450 Maintenance 67
- 64 Instruction 0024-9400 68
- 4.4.1 O 69
- , CO, NO, NO 69
- , & SO 69
- Sensor Replacement 69
- 66 Instruction 0024-9400 70
- 4.4.3 HC Sensor Replacement 71
- PARTICULATE FILTER 72
- (Install with arrow pointing 72
- WATER TRAP/FILTER ASSEMBLY 73
- GAS HOSE 73
- RESET BUTTON 74
- 5 Troubleshooting 76
- 5.3 Error Symbols 77
- 5.4 Troubleshooting Guide 78
- ECA 450 Parts & Service 79
- 76 Instruction 0024-9400 80
- 78 Instruction 0024-9400 82
- 6 Parts & Service 83
- 6.2 Accessories 84
- 6.3 Service Centers 85
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