®
INSPECTION
Before installation carefully check the Model Number on
each instrument against the receiving paperwork and
the intended application. Inspect for shipping damage
and, if damaged, report it immediately. Verify when
the unit is unpacked and in a vertical position that the
pointer is on zero. If the pointer is off zero see
TROUBLE SHOOTING section 2 for instructions
on zeroing the pointer.
NOTE: BEFORE
ATTEMPTING
REPAIRS,
CONTACT YOUR LOCAL MID-WEST
REPRESENTATIVE OR OUR FACTORY.
FAILURE TO DO SO WILL VOID ANY
WARRANTY.
PRODUCT DESCRIPTION
The Model 116 design for cryogenic applications are
all-metal differential pressure gauges capable of
operating at low differential pressures for up to 500
PSI of line pressure.
The DPI is equipped with a Bi-directional Over Pressure
Relief Valve (OPV). When the Differential Pressure
exceeds 130% of the range the OPV equalizes the
pressure between the Hi and Lo sides. Dual top and
bottom connections are provided as standard. The DPI
is also equipped with a pointer zero “micro-adjust”. If
necessary the pointer can be re-zeroed.
CAUTION:
Rapid pressurization can cause severe damage
to the sensing element. Rapid pressure change
(either increase or decrease) is a change in
pressure occurring fast enough to drive the
instrument full scale in one (1) second or less.
See installation portion of this I.O.M. for
guidance in how to prevent rapid
pressurization.
Model 116 DPI
Installation and Operating Instructions
Mid-West
Instrument
BULLETIN NO. IM116DPI/08
