Calibration Solutions
for Pressure
and Flow™
Instruction Sheet
molstic™ hi flow
molstic™ hi flow
molstic™ hi flow
molstic™ hi flow
P/N 401663
molbloc™ Mounting System
DESCRIPTION
molstics provide an engineered solution to the practical issues of mounting a molbloc, connecting a gas supply,
regulating the pressure and connecting the device to be tested. Highest quality components are integrated into
a convenient, compact assembly.
molstic, hi flow (P/N 401663) is designed for use with the 1E5 molbloc at flows up to 100 slm. It does not
accommodate any other size molblocs.
A gas supply is connected using a quick connector. A 2 micron filter protects the downstream components.
Then, an adjustable (0 kPa/0 psig to 700 kPa/100 psig) regulator sets molbloc upstream pressure and protects
the molbox transducers against accidental overpressure. A bellows shut-off valve, just before the molbloc,
allows the gas supply upstream of the molbloc to be shut-off. A connection and a vertically adjustable DUT
platform are provided downstream of the molbloc for mounting a device under test or the optional metering
valve kit.
START UP
Starting up a molstic requires connecting a gas pressure supply, adjusting the pressure regulator if necessary,
and connecting the device or system to be tested downstream of the molbloc.
!
Connect the gas supply:
Connect a gas supply to the quick connector stem (1/4 in. SWG
®
, NUPRO
®
SS-QC4-D-400). Ideally, inlet supply pressure is regulated to approximately 760 kPa (110 psig). In no
case should the supply exceed 1 MPa (150 psig). Note:
Be sure the molstic isolation valve (1) is
closed
(handle down) before connecting the quick connector stem to the quick connector. Do not connect
or disconnect the quick connector with a pressure greater than 1.5 MPa (200 psi) on either side.
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Install the molbloc:
Install the molbloc onto the molstic (see molbloc INSTALLATION below).
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Adjust the pressure regulator:
The molstic is delivered with the pressure regulator set to 270 kPa
absolute (40 psia) (about 165 kPa gauge (26 psig)), the most common molbloc upstream pressure setting.
Depending on the molbloc’s pressure dependent calibration type, a different molbloc upstream pressure
setting may be needed (see the molbloc calibration report). To adjust the regulator, cap the pressure
downstream of the molbloc. Open the molbloc isolation valve (1). Read the molbloc upstream pressure
using the [P&T] function of the molbox (see the molbox Operation and Maintenance Manual). Adjust the
molbloc upstream pressure to the desired value by inserting a screwdriver into the regulator stem (4) and
rotating the adjustment screw until the desired pressure is set. Note:
The regulator is NOT self venting.
If desired, once the desired pressure is set, lock the regulator stem by tightening the jam nut on the stem.
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Install the MFC/device under test:
The downstream connection is 1/2 in. VCR.
If desired, install the
1/2 in. to 1/4 in. VCR adaptor provided in the molstic accessories. For DUT fittings other than VCR, use
the appropriate adaptor (not supplied). If desired, install the DUT platform (2) to assure that the DUT is at
the correct height for alignment with the molstic downstream fitting (see DUT PLATFORM INSTALLATION
AND OPERATION below). If you have a metering valve option for manual flow control, install it here.
The metering valve option requires use of the 1/2 in. to 1/4 in. adaptor.
Q U IC K C O N N E C T
S TE M W ITH ¼ IN .
S W AG EL O K F IT T IN G
Q U IC K
C O N N E C TO R
½ IN .
V C R
