Output Connections; Instrument Connection; Vent - Fisher 4070 Instruction Manual

I/P UNIT,
TYPE 4070
INPUT SIGNAL GAUGE
PORT FOR TYPE 4060
INSTRUMENT
CONNECTION
OUTPUT
CONNECTION
SUPPLY
CONNECTION
OUTPUT
CONNECTION
A7227 / IL
Figure 5. Positioner Pressure and Gauge Connections
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-
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.
The supply medium must be clean, dry air or noncor-
rosive gas that meets the requirements of ISA Stan-
dard S7.3-1975. The supply pressure should not ex-
ceed the following limits:
For the actuator and positioner, do not exceed
the maximum pressure rating of 125 psig (8.6 bar).
For the valve, do not exceed the maximum allow-
able thrust of the specific valve.
Connect supply pressure to the positioner supply port
S. Gauge port S is sealed with a plug. To install a sup-
ply gauge, unscrew the plug and install an appropriate
gauge.

Output Connections

For Type 585C actuators, connect the positioner out-
put port C1 to the actuator lower cylinder (yoke) con-
nection. Connect output port C2 to the actuator upper
cylinder connection.
For Type 585CR actuators, connect the positioner
output port C1 to the actuator upper cylinder connec-
tion. Connect output port C2 to the actuator lower cyl-
inder (yoke) connection.
For single-acting operation plug port C1 for increasing
signal to open or close. Plug C2 for decreasing (re-
verse) signal to close.
Gauge ports C1 and C2 are sealed with plugs. To
install gauges, unscrew the plugs and install gauges.
GAUGE
PORTS

Instrument Connection

Connect the control device 3 to 15 psig (0.2 to 1.0 bar)
output to the positioner input port I. If a gauge is de-
sired, remove the plug from port I
propriate pressure gauge.
The Type 4070 electro-pneumatic positioner requires
a 4 to 20 milliampere dc current input signal from the
control device. For connections to the Type 4070, re-
fer to the electrical connections section.

Vent

If a flammable, toxic, or reactive gas is
to be used as the supply pressure me-
dium, personal injury or property dam-
age could result from fire or explosion
of accumulated gas or from contact with
toxic, or reactive gas. The positioner/ac-
tuator assembly does not form a gas-
tight seal, and when the assembly is en-
closed, a remote vent line, adequate
ventilation, and necessary safety mea-
sures should be used. A remote vent
pipe alone cannot be relied upon to re-
move all hazardous gas. Vent line pip-
ing should comply with local and re-
gional codes and should be as short as
possible with adequate inside diameter
and few bends to reduce case pressure
buildup.
The port (OUT) is for venting the unit. All air from the
positioner, actuator, and I/P unit is vented to atmo-
sphere through this port. This port should be left open
Type 4060 & 4070
and install an ap-
p
WARNING
5