RKI Instruments 35-3000RKA-10 - Manual (Page 25)

35-3000RK-10 PPM Hexane Sample Draw Detector • 25
6. Connect the humidifier tube from the gas collection bag to the dispensing valve, then
open the clamp.
7. Turn the dispensing valve’s on/off knob counterclockwise to open the dispensing
valve. The gas collection bag begins to fill.
8. Turn the dispensing valve’s on/off knob clockwise to close the dispensing valve when
the gas collection bag appears full.
9. Close the tubing clamp, then disconnect the humidifier tube from the dispensing
valve.
Setting the Zero Reading
1. Open the tubing clamp, then connect the humidifier tube from the gas collection bag
to the sample draw detector’s inlet sample line. This step is not necessary if you
verified a fresh air environment earlier in this procedure.
2. Allow the sample draw detector to sample the gas for one minute. If the inlet line is
long, allow time for the sample to reach the detector, about 1 second per foot of
sample line.
3. Verify a voltmeter reading of 100 mV (± 2 mV).
4. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the
voltmeter reading is 100 mV (± 2 mV).
5. Allow the sample draw detector to draw out any residual gas in the gas collection
bag, then close the clamp. Step 5 through Step 7 are not necessary if you verified a
fresh air environment earlier in this procedure. If you verified a fresh air
environment, go to step Step 1 in the next section, Setting the Response Reading.
NOTE: This step will cause a low flow alarm.
6. Disconnect the humidifier tube from the inlet sample line.
7. Unscrew the dispensing valve from the zero air calibration cylinder, then screw the
dispensing valve onto the hexane calibration cylinder.
Setting the Response Reading
1. Connect the humidifier tube from the gas collection bag to the dispensing valve
(installed on the hexane calibration cylinder), then open the tubing clamp.
2. Turn the dispensing valve’s on/off knob counterclockwise to open the dispensing
valve. The gas collection bag begins to fill.
3. Turn the dispensing valve’s on/off knob clockwise to close the dispensing valve when
the gas collection bag appears full.
4. Close the tubing clamp, then disconnect the humidifier tube from the dispensing
valve.
5. Open the tubing clamp, then connect the humidifier tube from the gas collection bag
to the sample draw detector’s inlet sample line.
6. Allow the sample draw detector to draw calibration gas for one minute. If the sample
line is long, allow time for the sample to reach the detector, about 1 minute per foot of
sample line.
7. Verify that the test points output matches the response output (±2 mV) you
determined earlier.