RKI Instruments 35-3000RK-LEL - Manual (Page 19)

35-3000RK-LEL Combustilbe Gas Sample-Draw Detector • 19
Setting the Zero Reading
1. Open the tubing clamp, then connect the sample tubing from the gas collection bag to
the sample-draw detector’s inlet line. This step is not necessary if you verified a
fresh air environment earlier in this procedure.
2. Allow the sample-draw detector to draw sample for one minute.
3. Follow the directions in the controller’s operator’s manual for setting the zero
reading. If you used a zero air calibration cylinder to set the zero reading, proceed to
step 4. If you verified a fresh air environment, proceed to the next section, Setting the
Response Reading.
4. Allow the sample-draw detector to draw out any residual gas in the gas collection
bag.
5. Close the tubing clamp, then disconnect the gas bag sample tubing from the inlet
fitting.
NOTE: This step will cause a low flow alarm.
6. Unscrew the dispensing valve from the zero air calibration cylinder.
Setting the Span
1. Screw the dispensing valve onto the combustible gas calibration cylinder.
2. Connect the tubing from the gas collection bag to the dispensing valve, then open the
clamp.
3. Open the dispensing valve. The gas collection bag begins to fill.
4. Close the dispensing valve when the gas collection bag appears full.
5. Close the tubing clamp, then disconnect the sample tubing from the dispensing valve.
6. Remove the dispensing valve from the combustible gas calibration cylinder.
7. Open the tubing clamp, then connect the sample tubing from the gas collection bag to
the sample-draw detector’s inlet line.
8. Allow the sample-draw detector to draw sample for one minute.
9. Follow the directions in the controller’s operator’s manual for setting the span.
10. Allow the sample-draw detector to draw out any residual gas in the gas collection
bag.
NOTE: This step may cause a low flow alarm.
11. Disconnect the gas bag sample tubing from the inlet fitting.
12. Unscrew the dispensing valve from the combustible gas calibration cylinder.
Returning to Normal Operation
1. Wait approximately one minute to allow the combustible gas reading to decrease
below the alarm level.
2. Follow the instructions in the controller’s operator’s manual to exit the calibration
mode.