Mid-West Instrument 109 Series Installation And Operating Instructions

Mid-West
Installation and Operating Instructions -
F
1. Safety
Before installing verify compatibility to the process
media and temperature in contact with the wetted
parts. Incompatible media and / or operation at
temperature extremes
degradation of materials which could result in
safety risk to personnel.
Verify the selected pressure range (differential
pressure and working
specification for your application.
Warning! Remaining media may result in a
risk to personnel, environment etc.
Use sufficient
measures when
transporting the product.
1.1
Intended use: The differential pressure gauges
are used for monitoring differential pressures in
industrial applications. The manufacturer shall not
be liable for any claims if the product is used in
applications contrary to the intended use.
1.2
Personnel: Personnel installing and putting this
instrumentation into service shall be suitably trained
and qualified in accordance with local codes,
practices and regulations.
®
Instrument
can cause premature
pressure) are within
precautionary
removing and
Model 109 Series
PRODUCT DESCRIPTION
The Model 109 is a precision differential pressure
gauge capable of working in systems requiring medium to
high differential pressure readout. A test quality bourdon
tube assembly is used to sense the differential pressure.
The assembly is encapsulated in a high pressure chamber
that is fitted with a pressure connection to the inside of the
bourdon tube and a second connection to the pressure
chamber.
The output shaft of the bourdon tube and gauge
movement is magnetically coupled through the solid wall
of the pressure chamber to a sensitive jeweled pointer
shaft in the dial housing outside the chamber. The
bourdon tube is protected against over-range, in either
direction, to the rated working pressure by a bi-directional
relief valve.
MODEL 109
B 3.20
[81.3 mm]
A
.82
[20.9 mm]
C
Bulletin No: IM109/18
Supersedes IM109/01
5.00
HI LO
[126.5 mm]
1/4 NPT
PROCESS PORT
2.00
(2) PLACES
[50.8 mm]
LENGTH C
0.81
[20.6 mm]
1.62
[41.3 mm]
1/4-20 UNC
(5) THREADS
FOR MOUNTING
(2) PLACES