Michell Instruments Pura 2-Wire, Руководство пользователя

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Pura 2-Wire/3-Wire/Digital Transmitter
User’s Manual
8 97070 Issue 12.1, March 2016
INSTALLATION
2.6.2 Pura OEM & PRM Connection
The Pura OEM and PRM have been assembled and packaged within a Class 100 clean-
room environment. To maintain this level of cleanliness the packaging should only be
opened within the same, or cleaner, environment.
Michell Instruments recommends the use of Swagelok
®
retained gasket assemblies,
containing silver plated, stainless steel ¼” VCR gaskets, when connecting the Pura into
a gas line. The distance between the inlet and outlet gas connection ports is set at a
pitch of 120mm (4.7”).
1. Install the sealing gasket onto the VCR connections on either the
Pura or the connecting gas lines. Ensure that the Pura is offered
into the gas line with reference to the gas fl ow direction and the
inlet port, as indicated on the Pura body.
Inlet
Outlet
Figure 11
Inlet/Outlet Identi fi cation
NOTE: In order to identify the Inlet and Outlet without
dismantling the instrument it is necessary to look through the
Inlet/Outlet holes. Looking through the INLET hole a shiny end
can be seen, looking through the OUTLET hole an elongated
shape can be seen.
2. Tighten the female nut fi rmly, fi nger tight.
3. Hold the Pura transmitter stationary with a spanner/wrench and
tighten the gas line nut 1/8 of a turn using a second spanner/
wrench.
4. Repeat this operation on the remaining gas connection port.
CAUTION: Over-tightening the nuts can cause irrecoverable
damage to the seals and seatings.