Instruction manual

120-00004 REV A 10/6/2011 4000 DIGITAL MANUAL PAGE 10
2.2 Sampling
Analyzer must be zeroed prior to sampling (section 2.1).
Set the FUNCTION switch to SAMPLE to activate the pump. If the
INLET or OUTLET is blocked, the pump may stall. Note: Running
the Analyzer with blocked INLET or OUTLET may lead to the
sensor leaking caustic electrolyte leading to analyzer
damage. Power analyzer off, and clear the blockage. To reset
the pump, set the FUNCTION switch to ZERO momentarily and
then switch again to SAMPLE.
Nominal sample rate in MOST analyzers is approximately 1.0,
0.2 liter per minute. NOTE: For hydrazine analyzers with the
measuring range of 0-100ppb the sample flow rate is 2.2 0.2
liters per minute. The Average sample run time, starting with fully
charged “C” NiCd batteries, is 12 hours. If the BATTERY TEST
“A” indication is down to 100 on the LCD display, the flow rate
may have started to decrease. This is usually not a problem
unless very precise readings are required.
Sampling from high pressure may only be achieved by using the
method indicated in (fig. 5).
Note: The sample to the Interscan Analyzer must be drawn
perpendicular to the Sample flow stream.
Pressurized
Sample
Minimum flow
rate 1.4 liters per
minute
To Interscan
Analyzer inlet
To Ambient pressure or
Vacuum not to exceed 3
inches of water.
(fig. 5)