RKI Instruments 35-3000RKA-10 User Manual
Page 15
35-3000RK-10 PPM Hexane Sample Draw Detector • 15
NOTE:
The following procedure assumes the use of a calibration kit that includes a
calibration gas cylinder, a dispensing valve with an on/off knob, a gas bag, and a
humidifier tube to connect the gas bag to the dispensing valve and to the sample
draw detector inlet fitting. A demand flow regulator calibration kit is also
available.
WARNING: The controller is not an active gas monitoring device during the response
test.
Preparing for the response test
1.
Verify that the display reading at the controller is 0 ppm.
If the display reading is not 0, set the zero reading as described in “Calibration” on
page 23, then continue this procedure.
2.
Follow the instructions in the controller’s operator’s manual for entering calibration
mode.
3.
Set a voltmeter to measure in the millivolt (mV) range.
4.
Open the housing door, then plug the voltmeter leads into the test points on the
amplifier.
Plug the positive lead into the red + test point; plug the negative lead into the black -
test point.
5.
Use the following formula to determine the correct test points output for the test
sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a test sample of 250 ppm hexane and a fullscale setting of 500 ppm
hexane, the correct output is 300 mV.
300 (mV) = (250/500) X 400 +100
6.
Run one end of the humidifier tube through the tubing clamp provided with the
calibration kit and connect this end to the fitting on the gas collection bag.
WARNING: The humidifier tube used with this calibration kit includes polyurethane
tubing on each end of the humidifier tube to facilitate making connections
to hose barbs. Do not clamp on the middle braided tube section of the
humidifier tube. Only clamp on the polyurethane tube on either end of the
humidifier tube.
7.
Connect the humidifier tube from the gas collection bag to the inlet sample line.
Allow the sample-draw pump to draw out any residual gas in the gas collection bag.
8.
Close the tubing clamp.
NOTE:
This step will cause a low flow alarm.
9.
Disconnect the humidifier tube from the inlet sample line.
10. Screw the dispensing valve onto the test gas cylinder.