Supply Pressure - Fisher 2500 Series Instruction Manual

Type 2500
A6620/IL
Figure 10. Piezometer-Ring Cage for Flow Line Mounting
Figure 11 shows dimensions, locations, and connec-
tions for controller/transmitter installation. All pressure
connections to the controller/transmitter are 1/4-inch
NPT female.

Supply Pressure

WARNING
Personal injury or property damage may
occur from an uncontrolled process if
the supply medium is not clean, dry, oil-
free, or a noncorrosive gas. Industry
instrument air quality standards de-
scribe acceptable dirt, oil, and moisture
content. Due to the variability in nature
of the problems these influences can
have on pneumatic equipment, Fisher
Controls has no technical basis to rec-
10
10A1211–A
22A9197–B
CD1700–E
A2708–1/IL
Figure 11. Controller/Transmitter Dimensions and Connections
ommend the level of filtration equipment
required to prevent performance degra-
dation of pneumatic equipment. A filter
or filter regulator capable of removing
particles 40-microns in diameter should
suffice for most applications. Use of
suitable filtration equipment and the es-
tablishment of a maintenance cycle to
monitor its operation is recommended.
Supply pressure must be clean, dry air or noncorrosive
gas that meets the requirements of ISA Standard
S7.3-1975 (R1981). Use a suitable supply pressure
regulator to reduce the supply pressure to the normal
operating supply pressure shown in table 3. As shown
in figure 11, a Type 67FR filter/regulator mounts on
the back of the controller/transmitter case and mates
with the supply pressure connection on the controller/
transmitter case. Pipe the supply pressure to the IN
connection of the regulator. Typically, the Type 67FR
filter/regulator accepts supply pressures between 35
and 250 psig (2.5 and 17 bar). For specific regulator
limits, refer to the appropriate regulator instruction
manual.
If operating the controller or transmitter from a high
pressure source [up to 2000 psig (138 bar)], use a
high pressure regulator system, such as the Type
1367 High Pressure Instrument Supply System. For
Type 1367 system installation, adjustment. and main-
tenance information, see the separate instruction
manual.