Instruction Manual
D200124X012
2500 and 2503 Controllers/Transmitters
June 2017
5
Figure 2. Guidelines for Use of Optional Heat Insulator Assembly
0
20
40
60
80
100
120
140
160
USE INSULATOR (CAUTION! IF AMBIENT DEWPOINT IS ABOVE
PROCESS TEMPERATURE, ICE FORMATION MAY CAUSE INSTRUMENT
MALFUNCTION AND REDUCE INSULATOR EFFECTIVENESS.)
0
10
20
−
18
−
10
30
40
50
60
70
71
593
500
400
300
200
100
−
40
0
400
800
1100
−
20
NO INSULATOR NECESSARY
AMBIENT TEMPERATURE (
_
C)
STANDARD CONTROLLER OR TRANSMITTER
AMBIENT TEMPERATURE (
_
F)
HEAT INSULATOR
REQUIRED
TOO
HOT
NOTE:
FOR APPLICATIONS BELOW -29
_
C (-20
_
F), BE SURE THE SENSOR MATERIALS OF CONSTRUCTION
ARE APPROPRIATE FOR THE SERVICE TEMPERATURE.
PROCESS TEMPERATURE ( C)
_
PROCESS TEMPERATURE ( F)
_
0
20
40
60
80
100
120
140
200
0
10
20
−
18
−
10
30
40
50
60
70
105
593
500
400
300
200
100
0
0
400
800
1100
−
20
NO INSULATOR NECESSARY
AMBIENT TEMPERATURE (
_
C)
HIGH‐TEMPERATURE CONTROLLER OR TRANSMITTER
AMBIENT TEMPERATURE (
_
F)
HEAT INSULATOR
REQUIRED
TOO
HOT
PROCESS
TEMPERATURE
(
C)
_
PROCESS TEMPERATURE ( 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.)
CV6190-E
B1413‐3
−
40
−
29
−
18
100
220
thank
Table 4. Displacer and Torque Tube Materials
Part
Standard Material
Other Materials
Displacer
304 Stainless Steel
316 Stainless Steel, N10276, N04400, Plastic, and Special Alloys
Displacer Stem, Driver Bearing,
Displacer Rod and Driver
316 Stainless Steel
N10276, N04400, other Austenitic Stainless Steels, and Special Alloys
Torque Tube
N05500
(1)
316 Stainless Steel, N06600, N10276
1. N05500 is not recommended for spring applications above 232
_
C (450
_
F). Contact your
or application engineer if temperatures exceeding this limit are required.
Installation
2500 and 2503 controller/transmitters work in combination with 249 displacer‐type sensors. The factory attaches the
controller/transmitter to the sensor, unless it is ordered separately.
If using natural gas as the pneumatic supply medium, natural gas will be used in the pressure connections of the unit
to any connected equipment. The unit will vent natural gas into the surrounding atmosphere.
WARNING
Always wear protective clothing, gloves, and eyewear when performing any installation operations to avoid personal
injury.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
CAUTION
Do not use sealing tape on pneumatic connections. This instrument contains small passages that may become obstructed
by detached sealing tape. Thread sealant paste should be used to seal and lubricate pneumatic threaded connections.
