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SET UP AND PURGE OF THE CALIBRATION GAS DISPENSER
Calibration Gas. The gas required for automatic calibration of the catalytic combustion
and CO sensors is Bascom-Turner's methane calibration gas (Part No. MC-105) containing 2.5
±0.05% methane and 100 ppm ±2 ppm CO in air. It is provided in a disposable aluminum tank
containing 105 liters of gas, sufficient for at least 300 calibrations.
The thermal conductivity sensor can be calibrated with either pure methane or "pure"
system gas provided by the user.
Calibration Gas Dispenser.
atmospheric pressure to ensure accurate calibration. Bascom-Turner recommends using the
Calibration Gas Dispenser (Part No. CGD-001) which regulates and displays the delivery
pressure, approximately 5 to 10 inches of water, with a front panel pressure gauge.
The components of the calibration gas dispenser shown assembled in Figure 10 include:
SAFETY PRECAUTIONS: For your safety please read these instructions carefully. To
operate the flow regulator on a compressed gas cylinder, it is required that you be trained in its
proper use or be under competent supervision.
1.
Wear safety glasses when installing a gas regulator on a gas cylinder.
2.
Never heat or expose a gas cylinder to temperatures above 125
3.
Be certain that the gas stream is shut off at the regulator when not in use.
4.
Vent all calibration gas to outside air.
INSTALLING CALIBRATION GAS TANK
1.
Inspect cylinder's and regulator's Standard Compressed Gas Association (CGA)
connections for damage, dirt, dust, oil, or grease. Do not use if either is damaged.
Remove all traces of foreign materials with a clean, lint-free cloth.
2.
Be sure both the regulator and cylinder have compatible CGA fittings. Do not
attempt to use an adapter to connect incompatible CGA fittings.
The calibration gas must be delivered at or near
Description
Calibration gas dispenser
Methane calibration gas
Flow regulator
Mounting bracket for gas
APPENDIX I
Part Number
CGD-001
MC-105
FR-001
MB-001
36
o
F.
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