DETECTOR INSTALLATION (continued)
Testing Operating Voltages and Compensating For Conduit Wire Voltage Drops . (continued)
11. Obtain and record a voltage reading across red and black test points marked B on control module
printed circuit board, for later use in maintenance.
2-6.10 DETECTOR CALIBRATION . Calibrate control module response to detector(s) in accordance with
calibration procedures described in Section 3.
2-6.11 INSTALLATION OF PLUMBING FOR SAMPLE DRAWING DETECTOR ASSEMBLY #0023-4017 :
Installation of #0023-4017 detector (subsection 2-1) in areas where d fusion sampling is infeasible
requires the following materials and equipment (Fig 2-25):
Source of compressed air at 10-15 psi.
¼-inch tubing for inlet, compressed air, and exhaust lines; tubing material to be selected
considering type of sample to be drawn.
Flowmeter and metering valve.
In some installations: in-line moisture trap(s) at low point in run laid to grade.
Recommended for maximum reliability: differential pressure switch to indicate alarm in response
to flow failure.
Install inlet tubing so that line length does not exceed 100 feet (to keep response time short). Install exhaust
line as short as possible to minimize back pressure. When the gases being sampled are at an elevated
temperature, the detector and sample lines should be maintained above the "dewpoint" of the vapors being
sampled to avoid condensation. Install the detector assembly and sample lines as close as possible to the
heated source. If contact with the heat source is not possible, the sample line and reaction chamber should be
heated-traced with steam or electrical heaters as desired.
WARNING AND ALARM CIRCUIT MODIFICATIONS
As manufactured, each control module is provided with a RESET pushbutton