Calibration Gases
Two gas standards are used to calibrate the pCO
2
and pO
2
sensors.
Cal Gas provides the calibration point for 1 and 2 point pCO
2
and
pO
2
calibrations. Cal Gas contains 5.00 ± 0.05% carbon
dioxide and 12.00 ± 0.05% oxygen, balanced with
nitrogen and is NBS traceable.
Slope Gas provides the slope point for 2 point pCO
2
and pO
2
calibrations. Slope Gas contains 10.00 ± 0.05% carbon
dioxide balanced with nitrogen and is NBS traceable.
WARNING Compressed gas cylinders require careful handling. To prevent
damage and possible personal injury, observe the following precautions:
• Never drop cylinders, allow them to strike each other or subject
them to other strong shocks.
• Secure cylinders to a wall or bench, or place in a cylinder base
support stand.
• Never drag, roll or slide cylinders, even for short distances. Use a
suitable hand truck to move cylinders.
• Never tamper with safety devices in regulators or cylinders.
• Use these gases for the calibration of clinical and research
instrumentation only. US Law prohibits dispensing these gases for
drug use.
• The contents are under pressure – do not puncture.
• Do not use or store near heat or open flame.
• Do not expose cylinders to temperatures above 54°C (130°F) as this
may cause the contents to vent or explode.
• Never throw cylinders into fire or incinerators. Follow the disposal
instructions on the cylinders.
Calibration
The 248 automatically calibrates using one of the following user-
selectable methods. Five minutes before a calibration is due a
countdown message appears on the Ready screen. Samples can still be
measured during this time.
Fixed Time
The 248 automatically calibrates at a specified time interval. The
interval is user-selectable, and can be 30 or 60 minutes. A 1 point
calibration is carried out at every interval. A full 2 point calibration is
carried out at every fourth interval.
For example:
When the interval is set to 30 minutes, the 248 automatically carries
out a 1 point calibration every 30 minutes, and a 2 point calibration
every 2 hours.
Page 1-12 248 Operator’s Manual
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