Emerson Fisher 846 Instruction Manual page 11

Instruction Manual
Form 5739
February 2002
67
COVER REMOVAL
(2.62)
CLEARANCE
78
(3.08)
156
(6.15)
NOTE:
1
THE MOUNTING POSITIONS SHOWN ALLOW ANY MOISUTRE BUILDUP IN THE TERMINAL COMPARTMENT
TO DRAIN TO THE SIGNAL WIRE CONDUIT ENTRANCE. DO NOT MOUNT THE TRANSDUCER WITH THE TERMINAL
COMPARTMENT COVER ON THE BOTTOM; MOISTURE MAY ACCUMULATE IN THE TERMINAL COMPARTMENT
OR PILOT STAGE, PREVENTING PROPER TRANSDUCER OPERATION. THE VERTICAL MOUNT IS MOST EFFECTIVE
FOR MOISTURE DRAINAGE IN WET APPLICATIONS.
14B7361-D
A6626–3/IL
(20 psi). Doing so invalidates the
CENELEC flameproof certifications
and could allow flames to spread from
the unit potentially igniting and
causing an explosion.
The supply medium must be clean, dry air or
noncorrosive gas that meets the requirements of
ISA Standard S7.3-1975. An output span of 0.2 to
1.0 bar (3 to 15 psi) requires a nominal supply
pressure of 1.4 bar (20 psi) and a flow capacity not
3
less than 0.11 m /min (4 SCFM). For multirange
performance units with higher output spans, the
supply pressure should be at least 0.2 bar (3 psi)
greater than the maximum calibrated output
pressure.
The air supply line can be connected to the 1/4–18
NPT supply port, or to the supply port of a
filter-regulator mounted directly to the transducer.
215
(8.48)
CENTERLINE
OF ACTUATOR
Figure 2-2. Typical Dimensions with Type 67CFR Filter/Regulator and Gauges
6
(.25)
YOKE MOUNTED
Figures 2-2, 2-3, and 2-4 show all the installation
options.
The mounting boss for the air supply connection
contains two 5/16–18 UNC tapped holes that are
2-1/4 inches apart. The tapped holes allow direct
connection (integral mount) of a Type 67CFR
filter-regulator, if desired. When the filter-regulator is
factory mounted, the mounting hardware consists of
two 5/16–18 x 3-1/2 inch stainless steel bolts and
one O-ring. When the filter-regulator is field
mounted, the mounting hardware consists of two
5/16–18 x 3-1/2 inch stainless steel bolts, two
spacers (which may or may not be required) and two
O-rings (of which only one will fit correctly into the
housing O-ring groove and the other may be
discarded). This is due to the fact that the current
housing has been slightly modified from its original
design, hence, the additional hardware (if needed)
when field mounting the Type 67CFR filter-regulator.
Installation
FOR PROPER MOISTURE
DRAINAGE THIS END
1
MUST BE UP
191
(7.51)
13
(.50)
137
MODULE
(5.38)
COVER
REMOVAL
CLEARANCE
mm
(INCH)
2–3