TARGET Series | ENMET Corporation |
6.3.2 Zero Adjust
The calibration zero procedure is activated by pressing the SELECT button again. This starts a 30 second count down timer, at the end of which, the zero reading is stored in memory. The next screen displays the span gas concentration.
CAL: O2/CO/H2S/Mth Sampling CLEAN AIR MENU:Exit
Sample in 30 sec.
Example:
Display of Calibration Count Down
CAL: O2/CO/H2S/Mth Apply
NOTE: The oxygen sensor requires only the initial 30 second clean air procedure.
6.3.3 Applying Span Gas
Attach the calibration adapter to the cylinder of span gas and calibration shield. See figure 8.
CAUTION: Some gas require that the Target Sampling Shield and flow demand regulator be used for calibration. See Section 8.0, Table 3 and 4.
I | BRH L | : |
F A SENSOR IS INSTALLED IN | OCATION | |
Place instrument on charge over night. |
| |
The BRH sensor should be calibrated before any others. If the BRH sensor is installed in the TARGET, it will | ||
become contaminated if exposed to the combination or test gas and must be calibrated separately. | ||
If the BRH sensor is being calibrated with the | ||
1/3 full with clean, tap water. The tube should NOT go under the water line. No bubbles should be visible when | ||
| gas is flowing. See figure 8. | |
NOTE: The arrow on the humidifier bowl points in the opposite direction of airflow. | ||
If the BRH sensor is being calibrated with the | ||
| indicated. Use the storage case to support the humidifier while in use. See figure 8. | |
NOTE: The arrow on the humidifier bowl points in the same direction of airflow. | ||
|
| supplied starting November 2002. |
Failure to follow both of the BRH steps will cause an inaccurate calibration. | ||
F | A | : |
OR |
| LL OTHER SENSORS INSTALLED |
Use the reactive gases calibration adapter which does not have a humidifier bowl. For CO, O2, Methane sensor | ||
calibration these sensors may be calibrated simultaneously or individually using the combination calibration gas and reactive gases calibration adapter. See figure 8.
NOTE: When calibrating CO, O2 and CH4, with individual gas cylinders, the BRH calibration adapter should be used.
Failure to do so will cause an inaccurate calibration.
SPAN gas concentrations are not adjustable in this calibration procedure. SPAN gas concentrations are, by design, the concentrations available with ENMET calibration kits. See Section 8.0 for the default concentrations. If other concentrations are to be used for calibration, the calibration procedure in the Advanced Maintenance menu must be followed.
NOTE: If the span gas value has been previously changed in the Advanced Maintenance menu, that change is carried over to this procedure.
Attach the calibration shield to the sensor end cap of the instrument. See Figure 8A. Guide the flap of the shield into the groove on the bottom of the end cap and bring the top of the shield towards the top of the end cap. Tighten the thumb screw into the threaded hole in the sensor end cap.
TOP
Threaded hole for thumb screw
Sensor
End Cap
BOTTOM
Groove
Sensor
End Cap
| Thumb screw |
| Calibration Shield |
| Sensor End Cap |
Thumb screw | with Calibration |
Calibration Shield | Shield attached |
| |
Flap of Shield |
|
Figure 8a: Calibration Shield Attachment
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