178 • Preparing for Calibration or Bump Testing Gas Tracer Operator’s Manual, CSA
4. Continue to hold the AIR
▲
button until the display prompts you to release it.
The Gas Tracer will count down from 8 as it sets the fresh air reading for all
channels. If the combustible channel is set as %LEL only or vol% only, there is
no countdown period. The fresh air reading is set immediately.
Filling the Gas Bag
Use the following procedure to fill the gas bag with calibration gas.
1. Slide the tubing clamp onto the tubing and connect the tubing onto the sample
bag’s inlet. Leave the clamp unclamped for now.
2. Connect the other end of the tubing to the regulator’s or dispensing valve’s
hose barb fitting.
NOTE:
If you are filling the gas bag with ppm calibration gas, do not use the 6
inch humidifier tube at this point.
3. Fill the gas collection bag by screwing the fixed flow regulator onto the
calibration cylinder or by screwing the dispensing valve onto the calibration
cylinder and turning the knob counterclockwise.
NOTE:
If the regulator has no on/off knob, then gas will begin to flow at 0.5
LPM as soon as the regulator is connected to the cylinder.
4. Allow the gas to dispense until the gas collection bag is a little over half full.
5. If a fixed flow regulator without a knob is used, disconnect it from the cylinder
and immediately clamp down the hose clamp to prevent the release of gas
from the gas collection bag. If a fixed flow regulator with a knob or a
dispensing valve is used, turn the knob clockwise to stop the gas flow, clamp
down the hose clamp and remove the regulator or dispensing valve from the
cylinder.
6. Disconnect the tubing from the regulator or dispensing valve.
