Maintenance; Cleaning Of Optical Lens/Mirror; Function Test - Simtronics GD10-P00 Operating Manual

6 MAINTENANCE

The GD10P has no user adjustable parts. It is not recommended to open the GD10P, as this will
change the internal atmosphere, and the initial calibration could be affected. Opening the GD10P
voids all warranty offered at the time of sale.

6.1 Cleaning of optical lens/mirror

Remove the weather protection by unscrewing the front cover plate (two screws), use a soft,
clean tissue to rub off the contamination. The window and mirror are made of sapphire, which
is highly resistant to scratching. Make sure that the whole optical surface is clean.
For difficult contaminants the mirror and lens can be cleaned with an equal-part
mixture of isopropyl alcohol and water. Do not perform any testing of the detector
before this solution has dried and residues have been wiped away.

6.2 Function test

In order to perform function test of the detector, a test gas can be applied
through a 6 mm test nozzle on the front of the Weather Protection housing as
shown in the figure and observe the effect on the detector 4-20mA analog
output or through the control system.
This is a simple test to verify the main function of the detector, please note the
actual reading may be substantially lower than the calibration gas concentration
due to leaks/ventilation of the weather protection. As long as the detector
responds to the gas, the function of the detector is verified.
1) Clean the optical surfaces
2) Verify that the zero point (at no gas) is within the tolerance for the detector. Normal readings
should be below 4.5mA
3) Apply gas as shown. If there is no air movement, a test gas flow of minimum four liters per
minute will give approximately the same value as the test gas.
If there is an air movement of 0.5 m/sec., the test gas flow has to be increased (up to 20 liters
per minute) to get a reasonable reading. Covering the ventilation grille will also help getting a
higher reading. However, you may not be able to reach the actual gas concentration, any reading
above 10% is OK.
GD10P User Manual Page 25 of 44 850-811250-Rev.06b