DH Instruments MOLBLOC-S Инструктивный лист
Просмотреть онлайн или скачать pdf Инструктивный лист для Измерительные приборы DH Instruments MOLBLOC-S. DH Instruments MOLBLOC-S 2 страницы. Recommendations for molbloc-s installation
The molbloc-S is a high precision metrological
instrument whose stability over time is a key component
in the performance of the molbloc/molbox™ mass flow
calibration system. molbloc-S, like any high accuracy
standard, should be handled, operated, and stored
with care.
Use the following guidelines whenever
installing and using the molbloc-S.
AVOID PARTICULATE AND MOISTURE
CONTAMINATION
Particulate and moisture contamination must be
avoided. Potential sources of contamination, such as
an unclean gas supply or device to be calibrated,
should not be connected upstream of the molbloc-S
without the use of a 5 micron sintered metallic filter
upstream of the molbloc-S.
With the exception of ambient air, the molbloc-S
should only be used with dry gases. Air compressed
on-site (generally known as instrument air) should be
filtered to remove oil, moisture and particulates.
The final dew point temperature of the calibration gas
should be – 40 °C or lower.
MOLBLOC-S CONNECTIONS
The molbloc-S elements designated 5E1-S through
2E3-S have VCR face seal inlet connections and ISO-
KF Style vacuum flange outlet connections. The 5E3-
S and 1E4-S molbloc-S elements utilize ISO-KF Style
vacuum flanges for both the inlet and outlet. See the
relevant sections for further details.
CONNECTING,
DISCONNECTING
MOUNTING MOLBLOC-S WITH VCR
SEAL FITTINGS
In making the molbloc-S flow connections, always use
soft O-rings. They allow a leak free connection to be
accomplished with minimal torque, and they provide a
source of flexibility between the molbloc-S and
elements to which it is connected, protecting the
molbloc-S from mounting stresses.
Use the following O-ring seals for making molbloc-S
®
VCR
connections:
VCR
FACE
PART NO.
MOLBLOC-S
SEAL
DESIGNATOR
SIZE
DHI
5E1-S
1/4 in.
102070
and 1E2-S
2E2-S
1/2 in.
102912
thru 2E3-S
5E3-S and
n/a
n/a
1E4-S
AND
®
FACE
PART NO.
PARKER
SEAL GROUP,
O-RING DIV
COMPOSITION
Fluorocarbon
2-202
rubber (FKM),
®
Viton
Fluorocarbon
2-207
rubber (FKM),
®
Viton
n/a
n/a
Recommendations for
®
molbloc-S
Instruction Sheet
Making and Breaking Procedure for molbloc-S
VCR Face Seal Connection
Install the recommended soft O-ring securely against
the sealing surface in the nut of the mating fitting.
Align the mating nut with the molbloc's male VCR
fitting and thread the nut onto the fitting. Hold the
molbloc-S with your hand, rotate the nut until
resistance is felt when the O-ring begins to compress.
Holding the molbloc-S with your hand, tighten the
nut an additional 1/2 turn. A wrench may be used
on the nut if desired, but do not tighten beyond
one half turn. If more than one half turn is needed
to make a leak free connection, the O-ring may be
damaged and should be replaced.
To break the fitting, hold the molbloc-S with your
hand and loosen the nut until it is completely
backed off.
Never use wrenches to hold the molbloc-S body.
CONNECTING,
DISCONNECTING
MOUNTING MOLBLOC-S WITH ISO-KF
STYLE VACUUM FLANGES
The ISO-KF Style vacuum flange fitting utilizes an
internal centering ring and an external overpressure ring
clamp. The seal is affected by the uniform application
of pressure by the clamp on the 15° surface of the
mating stainless steel flanges. These mating flange
surfaces compress a Viton O-ring that is held in place
by the centering ring. The overpressure ring keeps
the O-ring in place, and maintains a leak free
connection when the system is subjected to internal
pressures above vacuum level.
reusable, rotatable, and can operate leak free in
vacuum applications up to 10
pressures of 700 kPa (100 psig).
Installation
AND
This connection is
-8
Torr, and in positive