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Siemens POWERS RL 243 MP, Technical Instructions

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Technical Instructions 

RL 243 MP Multi-Purpose Relay 

Document Number 155-042P25 
September 10, 2018 

Page 2 

Siemens Industry, Inc. 

 

Operation, 
continued 

 

Figure 1. 

 

The return line pressure R depends on the force exerted by adjustment spring S

1

 and air 

pressures at TD and TR. TR pressure is exerted against the bottom of the upper 
diaphragm, opposing S

1

. However, if S

1

 is greater than force TR, this difference (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

1

 is adjustable up to an equivalent pressure of 25 psi. 

Specifications 

Instrument air supply 
 

Normal  

0-2 5 psi (0 to 172 kPa) 

 

Maximum  

30 psi (207 kPa) 

Temperature limits 
 

Ambient  

40 to 120°F (4.4 to 49°C) 

 

Storage  

-20 to 120°F (-29 to 49°C) 

Adjustments  

Spring S

1

 0 to 25 psi (0 to 172 kPa) 

 

Hysteresis  

Within 0.25 psi (1.7 kPa) 

 

Relief valve differential  

Within 1.0 psi (6.89 kPa) 

Accessories 
 

Panel mounting  

For flush mounting,  

 

 

 

with adjustable knob, dial 

 

 

 

plate and mounting bracket 

 

Surface bracket  

For exposed surface mounting  

 

 

 

(

Use with Panel Mounting Kit

 

above) 

Summary of Contents for POWERS RL 243 MP

Page 1: ...sembly prevents signal lock up and assures fail safe operation The relay housing is provided with integral brackets to facilitate installation without a separate bracket A single spring adjustment is provided to allow setting the relay for desired operation The relay is adaptable for flush panel mounting to facilitate manual readjustment if desired Product Number 243 0009 Operation The relay outpu...

Page 2: ...d 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 S1 is adjustable up to an equivalent pressure of 25 psi Specifications Instrument air supply Normal 0 2 5 psi 0 to 172 kPa Maximum 30 psi 207 kPa Temperature limits Ambient 40 to 120 F 4 4 to 49 C Storage 20 to 120 F 29 to 49 C Adjustments S...

Page 3: ...ations can be obtained depending upon how it is piped and applied with other devices in a single system Direct acting amplifying See Figure 2 Reverse acting amplifying See Figure 3 Lower pressure transfer relay See Figure 4 Signal advancing relay See Figure 5 Minimum pressure relay See Figure 6 DA or RA limit control See Figures 7 and 8 Signal inverting relay See Figure 9 Characterized minimum pre...

Page 4: ...is adjusted with spring setting Relay is fail safe and cannot generate an output signal unless a source of air is available at S port Figure 3 Figure 3 Reverse Acting RA Amplifying Relay Lower Pressure Transfer Relay Output pressure will equal the lower of the two input signals Internal relief valve prevents signal lock up when pressure at S port drops below relay output pressure maximum different...

Page 5: ...able air supply at S port Figure 5 Figure 5 Signal Advancing Relay Minimum Pressure Relay Relay output will always provide a minimum pressure as adjusted with spring S 1 Variations in input signal below this minimum will not affect output pressure Output pressure will equal input pressure for any value over the minimum setting Air supply to S port can be from EP valve or equivalent to provide inte...

Page 6: ...ntrol Spring S 1 can be adjusted to allow a minimum output which will not be under control of the limiting device Figure 7 Figure 7 Direct Acting DA Limit Control Reverse Acting RA Limit Control Variable pressure signal from primary controller will pass directly to relay output Maximum relay output can be adjusted with spring S 1 An air pressure signal from the limiting device will reduce the poss...

Page 7: ...1 2 of spring setting A further rise in input pressure will reduce output by an equal amount Figure 9 Figure 9 Signal Inverting Relay Characterized Min Pressure Relay Initial input from controller will increase relay output above minimum at a 2 1 ratio until relay output is twice the minimum value A further increase in input pressure will increase the output an equal amount 1 1 ratio Figure 10 Fig...

Page 8: ...000 Your feedback is important to us If you have comments about this document please send them to sbt_technical editor us sbt siemens com Document No 155 042P25 Printed in the USA Page 8 Installation See Installation Instructions 129 121 for more information Multi Purpose Relay with integrel bracket can be installed on panels ducts unit ventilators or any other vertical or horizontal surface Relay...

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