Meriam MANOMETERS - Manual (Page 4)

or the high pressure line is below atmospheric pressure
they should be checked for leaks or plugs. Check for
proper zero setting.
Low Reading — Specific gravity of indicating fluid may
be too great: check scale legend and provide correct
indicating fluid. Check for leaks or plugs in high pressure
line, if it is above atmospheric pressure, and or in low
pressure line, if it is below atmospheric pressure. If meter
has a valve by-pass line, this valve must be leak free.
Check vent when used. Check for proper zero setting.
10. Maintenance
Normal maintenance necessary with Meriam manometers
is the occasional cleaning of the tubes. Some manometer
indicating fluids become oxidized with use. Others, over
long periods of time, react with gases and fluids with
which they are in contact, leaving a deposit on the surface
of the fluid, and, in turn, on the tube.
Prior to cleaning the glass tube, a manometerʼs indicating
fluid must be drained using the steam flow drain valve on
well type manometers or by carefully tipping a U-tube
manometer on its side. As the fluid in the manometer
may be classified as a SARA Title III Section 313 Toxic
Chemical and may be harmful to your health if handled
improperly, please consult the Material Safety Data Sheet
(MSDS) sheet supplied with this product for detailed
health and safety information and proper handling
information. Dispose of used indicating fluids and used
cleaning materials according to local, state, and federal
regulations.
The method of cleaning the various models is similar,
but, there are some differences. It is generally more
convenient to clean from the upper end of the manometer.
On installations where accessories or piping is connected
to the upper end of the manometer and it is inconvenient
to remove equipment, the tube can often be cleaned
through the drain plug connection in the lower channel
end block. It is recommended that wherever possible the
instrument be removed to a convenient table where it can
be laid horizontally to afford greatest care in performing
the various operations.
Meriam Cleaning Fluid
A clean manometer is essential for readability
and accuracy. Meriam No. 915E cleaning fluid is
recommended for use in all Meriam manometers. It is
available in gallon containers only.
11. Parts
For replacement and/or spare parts request parts
drawing specifying the following information.
Model number
Serial number
Range
12. Accessories
To broaden the application and simplify operation
of your instrument, Meriam provides the following
accessories:
Return Wells— for over-range protection
Fluid Check Valves — for over-range protection
Line Traps — to keep instruments clean by trapping
dirt from the process.
Moisture & Sediment Traps — to keep instruments
clean by trapping dirt from the process
Pressure Vacuum Variator.— static pressure/vacuum
pressure
Valves & Piping Manifolds — to simplify different
pressure measurements
Sight Feed Bubblers — for metering purge gasses
Table Mount Stands
Cleanout Bore Brushes
Seal Pots — for isolating process fluid from the
instrumentation
Orifice Plates & Flanges
Meriam Instrumentation has pioneered the
development and application of manometry since
1911. The highest standards of accuracy and
practical, high quality design have made the words
MERIAM and MANOMETERS synonymous to
the engineering and research world. We welcome
your inquiries pertaining to manometry, and will be
pleased to help in any way we can.
10920 Madison Ave.
Cleveland, OH 44102
Phone: 216-281-1100 Fax: 216-21-0228
www.meriam.com