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Technical Instructions

Document No. 155-107P25

RL 243-16

Rev. 1, April, 2000

RL 243 A Commercial Duty Analog

Relay

Siemens Building Technologies, Inc.

Description

The RL 243 A Commercial Duty AnaIog Relay is a pneumatic device designed to provide

a variety of pneumatic control functions such as amplifying, ratio, summing, averaging,

etc. A description of these and other functions can be found in the

Applications

section.

Features

•

Multi-function relay

•

Signal-amplification

•

Low hysteresis

•

Relief assembly to prevent signal lock-up

Product Number

243-0048 Analog Relay with Mounting Bracket

Specifications

Maximum air supply 30 psig (207 kPa)

Ambient temperature range

Operational 40 to 120°F (4 to 49°C)

Storage -20 to 120°F (- 29 to 49°C)

Hysteresis 0.25 psig (1.7 kPa)

Relief valve differential 1.0 psig (6.9 kPa)

Air capacity 400 SCIM (109 ml/s)

Air consumption (max.) 7 scim (2 ml/s)

Air connections Barb for 1/4-inch (6.4 mm) OD

polyethylene tubing

Weight 9 oz. (0.26 kg)

Dimensions See

Figure 16

Accessory

Mounting Bracket (included with product) 243-246

Discontinued

Summary of content (11 pages)

PAGE 1
Technical Instructions Document No. 155-107P25 RL 243-16 Rev. 1, April, 2000 PowersTM Controls ue d RL 243 A Commercial Duty Analog Relay The RL 243 A Commercial Duty AnaIog Relay is a pneumatic device designed to provide a variety of pneumatic control functions such as amplifying, ratio, summing, averaging, etc. A description of these and other functions can be found in the Applications section.
PAGE 2
Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 Applications RL 243 A Commercial Duty Analog Relay The analog relay can be pneumatically piped in a variety of different combinations. Each combination represents a relay application that can be used to perform a specific function in a control loop. These applications are listed in Table 1 and described in Figures 2 through 15 beginning on page 3. Table 1. Analog Relay Applications.
PAGE 3
RL 243 A Commercial Duty Analog Relay Operation, Continued Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 ue d When S port pressure drops more than 1 psig (6.9 kPa) below R port pressure, the internal relief valve opens to vent the R port signal to prevent it from being locked up. tin Figure 1. Analog Relay.
PAGE 4
Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 RL 243 A Commercial Duty Analog Relay Operation, Continued OPERATIONAL FORMULA: T- TR- R Since TD is zero, and TR = T Ratio Relay 2 In = 1 Out Then T = R 2 Input T (psig) Output TR&R (psig) 0 1 4 8 12 d 0 2 8 16 24 ue R cannot be greater than S, and T – TR cannot be less than 0 psig. Figure 3. Ratio Relay 2 in = 1 out. tin Output pressure is equal to one-half the input pressure.
PAGE 5
RL 243 A Commercial Duty Analog Relay Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 Operation, Continued OPERATIONAL FORMULA: Averaging Relay TD + T = R 2 TD + (T – RT) = R Since TR = R, then Output TR & R (psig) 20 20 20 12 10 5 10 6 0 8 2 3 15 13 10 10 6 4 d Lower Input TD (psig) R cannot be greater than S, T – TR cannot be less than 0 psig, and T must always be greater than TD. ue Figure 5. Averaging Relay.
PAGE 6
Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 RL 243 A Commercial Duty Analog Relay Operation, Continued OPERATIONAL FORMULA: TD + (T – TR) = R Highest Pressure Signal Selector or Adjustable Minimum Pressure Relay Input #1 T (psig) Input #2 TD & TR (psig) 5 8 8 15 5 8 12 15 d 0 5 12 12 Output R (psig) ue R cannot be greater than S, and T – TR cannot be less than 0 psig. tin Figure 7. Highest Pressure Signal Selector or AdjustabIe Minimum Pressure Relay.
PAGE 7
RL 243 A Commercial Duty Analog Relay Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 Operation, Continued OPERATIONAL FORMULA: TD + (T – TR) = R Since TR = R, then Minimum Pressure Relay with Characterized Output TD + T = R If TR < T TD = R if Tr > T 2 If TD = 5 psig, then R cannot be greater than S, and T – TR cannot be less than 0 psig. Min Pressure TD (psig) 0 5 10 25 5 5 5 5 Output TR & R (psig) 5 5 7.5 15 ue d Input T (psig) tin Figure 9.
PAGE 8
Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 RL 243 A Commercial Duty Analog Relay Operation, Continued OPERATIONAL FORMULA: TD = R Since T and TR are zero. Direct Acting Relay R cannot be greater than S, and T – TR cannot be less than 0 psig. Output R (psig) 0 3 8 15 0 3 8 15 ue d Input TD (psig) Figure 11. Direct Acting Relay. tin Output pressure varies directly with changes in input pressure.
PAGE 9
RL 243 A Commercial Duty Analog Relay Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 Operation, Continued OPERATIONAL FORMULA: TD + (T – TR) = R. Since T and TR are zero, then TD = R if S > TD, or S = R if S < TD. Lowest Pressure Signal Selector R cannot be greater than S. Output R (psig) 25 0 15 3 0 25 6 10 0 0 6 3 d Input # 2 TD (psig) ue Figure 13. Lowest Pressure Signal Selector. Input # 1 S (psig) Output pressure will equal the lower of the two input pressures.
PAGE 10
Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 RL 243 A Commercial Duty Analog Relay Operation, Continued OPERATIONAL FORMULA: T – TR = R Since TD = 0 Signal Retard Relay R cannot be greater than S, and T – TR cannot be less than 0 psig. Retard TR (psig) 3 6 15 6 15 Output R (psig) 0 1 10 0 8 ue d 5 5 5 7 7 Input T (psig) Figure 15. Signal Retard Relay. tin Output pressure is zero until input pressure exceeds retard setting.
PAGE 11
RL 243 A Commercial Duty Analog Relay Technical Instructions Document Number 155-107P25 Rev. 1, April, 2000 ue d Component Construction Figure 17. Part Identification. Item tin Table 2. Part Identification. Description Qty. Material 1 NoryI Lower Body 2 Diaphragm assembly R I Fairprene & Noryl 3 Ring 2 Noryl Diaphragm assembly TD 1 Fairprene & Noryl Main body assembly 1 NoryI & DeIrin No.