Emerson Fisher FIELDVUE DVC2000 Instruction Manual page 21

100
80
60
40
20
0
−20
−40
−10
0
NOTES
ZONE 1: STANDARD GX BONNET AND STANDARD DVC2000 MOUNTING APPLY.
ZONE 2: REQUIRES GX EXTENSION BONNET OR HIGH TEMPERATURE DVC2000 GASKET SET.
Figure 2-9. Guidelines for Applying High Process Temperature Solutions to the Fisher GX and FIELDVUE DVC2000
Note
The GX extension bonnet option is an
alternate way to address the high
process temperature influence on the
DVC2000. However, if the extension
bonnet is used, the high temperature
DVC2000 mounting kit is not required.
If the process and ambient
temperatures exceed the limits
indicated by zone 2, then the DVC2000
high temperature mounting kit can not
be used. If temperatures exceed zone
2, you must use an extension bonnet
or bracket mounted instrument.
Identify the yoke side to mount the DVC2000 digital
valve controller based on the actuator fail mode. Refer
to the GX Control Valve and Actuator System
instruction manual (D103175X012).
1. Isolate the control valve from the process line
pressure and release pressure from both sides of the
valve body. Shut off all pressure lines to the actuator,
releasing all pressure from the actuator. Use lock-out
procedures to be sure that the above measures stay in
effect while you work on the equipment.
2. Loosely attach the feedback pieces and magnet
assembly to the valve stem connector. Do not tighten
the fasteners because fine adjustment is required.
July 2009
−50
0 50 100
PROCESS TEMP (_C)
150 200 250
ALIGNMENT TEMPLATE
LINE UP WITH UPPER
EXTREME OF VALID
TRAVEL RANGE
W9218
Figure 2-10. Air-to-Open Fisher GX Magnet Array Alignment
CAUTION
Do not install a magnet array that is
shorter than the physical travel of the
actuator. Loss of control will result
from the magnet array moving outside
the range of the index mark in the
feedback slot of the DVC2000 housing.
3. Using the alignment template (supplied with the
mounting kit), position the feedback array inside the
retaining slot.
4. Align the magnet array as follows:
Installation
300
2-7
2