Teledyne 402REU - Hydrocarbon analyzer - Manual (Page 31)

Total Hydrocarbon Analyzer Operations
4-7 Teledyne Analytical Instruments
the fuel supply. Within 5–30 seconds the flame out indicator
light will come on.
3. Open the cylinder supply valve and re-ignite the flame.
4.6.2 Ignition and/or Flame Guard Circuit Failure
If the flame ignition or guard circuits do not operate as described in
the above two sections, proceed as directed in Chapter 5: Maintenance &
Troubleshooting.
4.7 Calibration
Switch the gas selector valve to ZERO and observe that the meter
drives downscale. Switch the range switch to the LOW range and adjust
the zero control such that an on scale indication is observed. A recording
should be made so that the stabilization progress of the instrument can be
observed. After a stable reading is obtained:
1. “Zero” the analyzer by adjusting the zero control until the
meter reads the methane concentration indicated on the zero gas
tank, if other than 0 PPM; otherwise set the meter to zero.
2. After a stable zero reading is obtained, “span” the analyzer.
a. Switch the range switch to the range which gives the highest
resolution of the span gas used (usually the high range), and
observe that the meter reads zero.
b. Switch the gas selector valve to SPAN and observe that the
meter drives upscale. Wait until stable ready is obtained.
c. Adjust the span control until the meter reads the methane
concentration indicated on the span gas tank.
d. Repeat this procedure to confirm proper calibration.