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INM MTL 130-0126 Rev 13
13
4.3 Making measurements
The sample flow rate should be set at 100-300 ml/min.
It is essential that the range setting is appropriate to the measurement being made. The ranges
are as follows
• Range 1: 0 to 100% Carbon Dioxide in Air
• Range 2: 0 to 100% Hydrogen in Carbon Dioxide
• Range 3: 90 to 100% Hydrogen in Air (or Hydrogen purity range, automatically
selected when the instrument is powered up)
4.3.1 K6050
For low pressure samples (less than 25mm water gauge) turn the front panel rotary switch to
“Pump” to increase the flow rate if necessary.
4.4 Changing range
From Range 1, press the up arrow key once for Range 2 and once again for Range 3.
The down arrow key (“ ”) scrolls back through the ranges and the selected range is shown at
the bottom of the display.
Using a combination of the H
2
in CO
2
/Range relay and the CO
2
in
Air/Range relay it is possible to
monitor externally which of the three ranges has been selected.
To acieve this, the mode setting in both the H
2
in CO
2
and CO
2
in Air alarm settings needs to be set
to range. (refer to section 5.5)
Table 2 indicates the status of these relays when they are set to range.
Note:-
These settings are based on the relays being energised in process normal operation
Instrument
mode
Condition
H
2
in CO
2
Relay
set to range
CO
2
in Air Relay
set to range
CO
2
in Air Relay
set to range
Measure
CO
2
in air range
selected
De-energised
Energised
Always off
H
2
in CO
2
range
selected
De-energised
De-energised
Always off
H
2
in air range
selected
H
2
in air range
selected
De-energised
Always off
Calibration
All conditions
Energised
Energised
Always off
Table 2
- Range alarm function