FTS Adaptor Kit for molbloc-S™
P/N 401932
Installation and Operation Instructions
This document describes the hardware setup and
other recommendations for testing the orifice flow
meters used for verification/calibration of flows into
PM2.5 particulate monitoring instruments. The Chinook
Engineering Streamline flow transfer standard (FTS) is
used by leaving the inlet to the orifice open to
atmosphere and drawing the air flow through the device
utilizing a downstream vacuum source (sub-atmospheric
pressure).
HARDWARE REQUIRED
•
molbloc-S elements: Designated 2E2-S and 5E1-S
•
End flange conversion kit, 1/4 in. VCR, P/N 401935
(allows the placement of 2E2-S molbloc-S on 1/4 in.
molstic-S)
•
molstic-S Platform: Dual, 1/4 in. with low flow metering
valve, P/N FAM0009-01-3, with option -04-2
•
Vacuum source and interconnecting hardware
INSTALLATION OF FTS ONTO MOLSTIC-S
1. Chinook
FTS
3. Filter
2. FTS adaptor
4. Double female VCR coupler
5.
Metering
valve
Remove and retain the VCR tube adaptor together
with the double female VCR coupler from the filter
element’s inlet connection, located on the inlet of
the molstic-S. Discard the VCR gasket, which is
for one-time use.
Place the included VCR soft o-ring into the groove
inside of the FTS adaptor.
Connect the FTS adaptor to the filter element’s
inlet connection. Refer to the VCR face seal usage
instructions in the molbloc-S instruction sheet,
document no. 560050, supplied with molbloc-S.
Carefully slide the Chinook Engineering FTS over
the adaptor until the adaptor “bottoms out” inside
the FTS.
PARTS INCLUDED IN FTS ADAPTOR KIT
SHIPMENT
The following parts are included in the FTS adaptor kit
shipment:
P/N 401932
FTS Adaptor Kit
DESCRIPTION
QTY
PART NO.
Adaptor, FTS to 4VCR
1
123659
1/4 in. VCR Face Seal O-ring
1
101421
APPLICATION NOTES
When operating the 200 sccm/kPaa molbloc-S in
sub-atmospheric conditions, its full-scale flow rate
is 20 slm (STP: 0 °C and 101.325 kPaa) at 101.325 kPaa.
In order to adjust flow through the FTS to the volumetric
flow rate of 16.67 lpm, the inlet absolute pressure to
this molbloc-S will have to be approximately 77 kPaa.
At its lowest volumetric flow rate of approximately 4 lpm,
the inlet absolute pressure will be 20 kPaa.
The 50 sccm/kPaa molbloc-S has full-scale flow rate
of 5 slm (STP: 0 °C and 101.325 kPaa) at 101.325 kPaa,
and will flow approximately 3 lpm at 55 kPaa. At its
lowest volumetric flow rate of approximately 1 lpm, the
inlet absolute pressure will be 20 kPaa.
The regulating valve in the configuration described
above is used to restrict the flow rate and thereby
reduce the molbloc-S inlet pressure. As long as the
vacuum source can maintain the molbloc-S outlet
pressure to that of no greater than 0.5x that of the inlet
pressure, the FTS can be checked at multiple flow
rates down to approximately 2 slm for the
200 sccm/kPaa, and 0.5 slm for the 50 sccm/kPaa
REFERENCE FLOW MEASUREMENT
In order for the molbox or COMPASS for molbox PC
software to properly calculate volumetric flow rate,
the prevailing conditions of ambient temperature,
absolute pressure, and relative humidity of the air
flowing into the FTS must be determined and entered.
If the FTS has the associated instrumentation capable
of measuring these values it should be used for
this procedure. Typically, the ambient temperature,
barometric pressure, and relative humidity of the
