TSI Incorporated 8550, Руководство по эксплуатации и обслуживанию

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Chapter 4
22
1. Locate the calibration collar and slide it over the sensing probe. Make
sure that the collar completely covers the CO
2
diffusion holes. Refer to
Figure 4–1.
Figure 4–1: CO
2
Calibration
2. Install the regulator onto the zero calibration gas cylinder and connect
tubing from the cylinder to the fitting marked
“GAS IN”
and turn the
gas on (0.3 L/min). Make sure the cylinder is not empty. It should
quietly “hiss” when it is on.
3. To put the Q-T
RAK
into CO
2
calibration mode, first put the instrument
into Survey mode, and then press and hold the
CO
2
key. The display
begins to count down from five to zero. When the count reaches zero,
release the
CO
2
key immediately. The words
“CALIBRATE ZERO”
should appear on the display. If not, try again.
Note : DIP switch 2 must be set to the “User Calibration” (ON) position or
the Q-T
RAK
will not go into CO
2
calibration mode. Please refer to
Appendix B: “Internal DIP Switch Settings.”
4. Press the SAMPLE key to take a zero measurement. The Q-T
RAK
will
display a 60-second count-down. When the count-down is completed,
the display shows the word
“CALIBRATE 1,”
the next span
concentration (typically 1000 ppm), and the arrow symbols (
!"
) will
be blinking. Turn off the regulator and disconnect the zero calibration
gas.