Emerson Fisher Level-Trol 2502 Series, Инструкция по эксплуатации, Страница: 4 / 28

2502 Series Controllers
Instruction Manual
Form 1446
November 2006
4
Table 1. Specifications (continued)
Hazardous Area Classification
2502 Series controllers comply with the
requirements of ATEX Group II Category 2 Gas
and Dust
Operative Ambient Temperatures
(4)
Standard Construction: 40 to 71 _ C ( * 40 to
160 _ F * )
High Temperature Construction:
*
18 to 104
_
C
(0 to 220 _ F).
See figure 2.
Declaration of SEP
Fisher Controls International LLC declares this
product to be in compliance with Article 3
paragraph 3 of the Pressure Equipment Directive
(PED) 97 / 23 / EC. It was designed and
manufactured in accordance with Sound
Engineering Practice (SEP) and cannot bear the
CE marking related to PED compliance.
However, the product may bear the CE marking
to indicate compliance with other applicable EC
Directives.
1. Term defined in ISA Standard S51.1.
2. Natural gas should contain no more that 20 ppm of H2S.
3. Control and stability may be impaired if this pressure is exceeded.
4. The pressure/temperature limits in this document, and any applicable standard or code limitation should not be exceeded.
5. Normal cubic meters per hour (m
3
/hr) at 0 _ C and 1.01325 bar. Scfh=standard cubic feet per hour at 60 _ F and 14.7 psia .
USE INSULATOR (CAUTION! IF AMBIENT DEWPOINT IS
ABOVE PROCESS TEMPERATURE, ICE FORMATION MAY
CAUSE INSTRUMENT MALFUNCTION AND REDUCE
INSULATOR EFFECTIVENESS.)
0 20 40 60 80 100 120 140 160
0 10 20
− 18 − 10
30 40 50 60 70
71
593
500
400
300
200
100
0
0
400
800
1100
− 20 − 29
NO INSULATOR NECESSARY
AMBIENT TEMPERATURE ( _ C)
STANDARD CONTROLLER OR TRANSMITTER
AMBIENT TEMPERATURE ( _ F)
HEAT INSULATOR
REQUIRED
TOO
HOT
NOTE: FOR SERVICE BELOW − 29 _ C ( − 20 _ F) CONTACT FACTORY.
PROCESS
TEMPERA
TURE ( C)
_
PROCESS
TEMPERA
TURE ( F)
_
B1413-1/IL
0 20 40 60 80 100 120 140 200
0 10 20
− 18 − 10
30 40 50 60 70
93
593
500
400
300
200
100
0
0
400
800
1100
− 20 − 29
NO INSULATOR NECESSARY
AMBIENT TEMPERATURE (
_
C)
HIGH-TEMPERATURE CONTROLLER OR TRANSMITTER
AMBIENT TEMPERATURE ( _ F)
HEAT INSULATOR
REQUIRED
TOO
HOT
PROCESS
TEMPERA
TURE ( F)
_
180 160
80 90
USE INSULATOR (CAUTION! IF AMBIENT DEWPOINT IS
ABOVE PROCESS TEMPERATURE, ICE FORMATION MAY
CAUSE INSTRUMENT MALFUNCTION AND REDUCE
INSULATOR EFFECTIVENESS.)
Figure 2. Guidelines for Use of Optional Heat Insulator Assembly
249 Series Sensors
D The Type 249, 249B, 249C, 249K, and 249L
sensors side-mount on the vessel with the displacer
mounted inside a cage (caged) outside the vessel.
D The Type 249BP and 249CP sensors
top-mount on the vessel with the displacer hanging
down into the vessel (cageless).
D The Type 249V sensor side-mounts on the
vessel with the displacer hanging out into the vessel
(cageless).
D The Type 249W sensor top-mounts on the
vessel or on a customer supplied cage.
External sensors provide more stable operation than
do internal sensors for vessels with internal
obstructions or considerable internal turbulence.
WARNING
When replacing the sensor assembly,
the displacer may retain process liquid
or pressure. Personal injury or
property damage due to sudden
release of pressure, contact with
hazardous liquid, fire, or explosion can
be caused by puncturing, heating, or
repairing a displacer that is retaining