Super Systems 1500 VRSD - Manual (Page 12)

Model 1500 VRSD Operations Manual
Super Systems Inc. Page 12 of 28
Operation
To obtain consistent accurate readings from the unit, be sure that the element in the
bowl filter on the side of the instrument is clean and functional. Not only will this
ensure that the sample reading is not abnormally high (since soot tends to trap
moisture), but it will also prevent soot and other contaminants from entering the unit
and damaging the sensor. The optimum flow rate of the sample gas should be between
1.5 and 2.0 Standard Cubic Feet per Hour (SCFH), although a flow rate as low as 1.0
SCFH is acceptable. If the unit is reading less than 1.0 SCFH, verify that there are no
obstructions to the flow such as a clogged sample line or a poorly adjusted knob on the
1500 VRSD flow meter.
Heat Treat Furnace Sampling: A gas sample may be extracted from a process using the
built-in pump. The sample tube from which the sample is taken out of the furnace
should extend into the furnace past the HOT face of the refractory. For accurate
results, a designated sample port should be used to extract the sample. SSi offers a
sample port assembly (part number 20263) which is ideal for this purpose.
Endothermic Generator Sampling: For applications under pressure, the pump should be
switched off and the flow controlled by the small restriction valve on the flow meter. A
flow rate between 1.5 and 2.0 SCFH is ideal. The sample should be taken from the
endothermic gas manifold after the gas has been cooled. NOTE: Allow the sample port
“to blow out any soot” before connecting the sample tube. Failure to do so will
unnecessarily coat the sample tubing assembly and possibly some internal components
with soot, resulting in inaccurate readings and exposing the sensor to potential
damage.
Returning the Unit to SSi
This analyzer contains some components that may require periodic replacement based
on the amount of use that the unit experiences and the methods in which it is used. If
service on the unit is necessary, it should be sent back to Super Systems, Inc. for repair.
To minimize damage to the mounting feet on the enclosure, it is possible to unscrew
them and rotate them 180 degrees (so they point into the enclosure instead of away
from it). This will reduce the likelihood that they will be damaged during shipment. If
the original packaging is not available, the analyzer should be surrounded by impact-
absorbing materials and placed in a box. It is the responsibility of the shipper to ensure
that the unit arrives at SSi undamaged.