MultiRAE - Shawcity Limited
MultiRAE - Shawcity Limited
MultiRAE - Shawcity Limited
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
esponse to test gas. Readings that go up to 2000 ppm and then decrease may be caused<br />
by saturation of the VOC sensor by gas concentrations over 2000 ppm.<br />
2.9.2 To test the sensor and lamp, place the unit in Diagnostic Mode (Section IV).<br />
2.9.3 Press the [MODE] key to reach the Lamp Failure Threshold screen. The threshold<br />
value is set to about 6 counts above the value obtained with no lamp in the PID. Page 8-4<br />
of the <strong>MultiRAE</strong> manual contains information on setting this value.<br />
2.9.4 If the Lamp Failure threshold is OK, press [MODE] repeatedly to get back to the<br />
raw data screen. Refer to the PID values in table 2.1.<br />
2.9.5 Zero values below the normal range, or a weak response to test gas, may indicate<br />
that the lamp is not illuminating sufficiently, or that the UV light is blocked by<br />
contamination on the lamp window. Remove the cover, gas piping plate, PID static<br />
shield, and PID sensor block. Remove the lamp, clean the crystal with anhydrous<br />
methanol, and reinstall the lamp. Turn on the unit. Caution: wear safety glasses to<br />
protect your eyes from UV light. Be aware that there are high voltages across the<br />
lamp electrodes. Check for a visible violet glow from the lamp. If there is no glow,<br />
then replace the lamp.<br />
2.9.6 Examine the sensor block for contamination, condensation, or corrosion. Soak and<br />
agitate the sensor in anhydrous methanol, preferably in an ultrasonic cleaner. Dry<br />
thoroughly. If there are still visible signs of contamination or corrosion, then replace the<br />
sensor.<br />
2.9.7 Reassemble and test the raw sensor output. If the delta value is still low try<br />
replacing the lamp, then the sensor. If the delta values are still low, then there is an<br />
electronic problem.<br />
3.0 Electronic Troubleshooting<br />
3.1 Power On Problem<br />
3.1.1 If the unit will not turn on, first check the battery pack, AC adapter, and fuses. If<br />
the alkaline battery adapter is installed, then the A/C adapter will not power the unit.<br />
Both the rechargeable batteries and the alkaline adapter have internal fuses, which can<br />
not be replaced.<br />
3.1.2 Try resetting the microprocessor by unplugging the battery pack. Wait a few<br />
minutes, and then reconnect the battery.<br />
20
Change language