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Technical Instructions
Document Number 155-042P25
September 10, 2018
Operation,
continued
Specifications
Page 2
The return line pressure R depends on the force exerted by adjustment spring S
pressures at TD and TR. TR pressure is exerted against the bottom of the upper
diaphragm, opposing S
1
minus TR) is transmitted by the stem to the main diaphragm below. The other force
acting downward on the main diaphragm is caused by the air pressure at TD. These
downward forces are balanced by air pressure R pushing up on the main diaphragm.
Spring force S
is adjustable up to an equivalent pressure of 25 psi.
1
Instrument air supply
Normal
Maximum
Temperature limits
Ambient
Storage
Adjustments
Hysteresis
Relief valve differential
Accessories
Panel mounting
Surface bracket
Figure 1.
. However, if S
is greater than force TR, this difference (S
1
RL 243 MP Multi-Purpose Relay
0-2 5 psi (0 to 172 kPa)
30 psi (207 kPa)
40 to 120°F (4.4 to 49°C)
-20 to 120°F (-29 to 49°C)
Spring S
0 to 25 psi (0 to 172 kPa)
1
Within 0.25 psi (1.7 kPa)
Within 1.0 psi (6.89 kPa)
For flush mounting,
with adjustable knob, dial
plate and mounting bracket
For exposed surface mounting
(Use with Panel Mounting Kit above)
Siemens Industry, Inc.
and air
1
1
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