©Johnstone Supply eCatalog 216

COMMERCIAL CONTROLS Pneumatics

Barber-Colman Selector Relays • Compares, selects and transmits the highest and/ or lowest of up to two pneumatic input signals • Small and lightweight • L38-497 can be used with restricted signals down to 0.5 SCFH • L38-496 can be used as volume booster relay when larger quantity of air is required to move multiple actuators

Specifications: • Power consumption: 1.7Va • Maximum supply air: 30 PSI • Air consumption: 0.017 SCFM at main port when used as volume booster

A

B

Each

Fig. Order # Mfg. #

Model #

Description

Dimensions

L38-496 2372-351 R432-11

A B

Selects Lowest of Two Signals/Volume Booster

1-3/16" Diam. x 1-3/16" L

369.00 329.00

L38-497

2372-352 R432-2

Selects Highest of Two Signals

1-1/8" Diam. x 1" L

Barber-Colman PNEUMODULAR ® Diverting Relays • Converts a proportional pneumatic signal into a positive pneumatic switching action

Specifications: • Maximum supply air: 30 PSI • Air capacity: 60 SCFH • Air consumption: 1 SCFH

• Feeds or exhausts branch lines, diverts supply line to either one or two branch lines, or diverts one of two supply lines to one branch line • Positive SPDT snap action pneumatic switching • Adjustable setpoint

• Dimensions: 2" W x 4-1/8" H x 2-15/16" D for L38-493 ; 2" W x 4-1/8" H x 3-1/8" D for L38 492

A

B

Each

Fig. Order # Mfg. #

Model #

Type

Set Point Range

Diff.

L38-492 2353-501 R503-1 L38-493 2354-501 R504-1

A B

Adjustable Setpoint, Requires Main Air Connection 3 to 20 PSI Adjustable Setpoint, No Main Connection Required 4 to 8 PSI

0.2 to 0.6 PSI 4 PSI Fixed

985.00 655.00

Barber-Colman PNEUMODULAR ® Reversing Relay • Reverses the action of a control signal • Field mounted or mounted to a Pneumodular ® socket • Proportional output with adjustable offset Specifications: • Maximum supply air: 30 PSI

• Air consumption: 0.017 SCFM • Airflow capacity: 230 SCIM • Crossover point: preset at 8 PSI; adjustable from 2 to 15 PSI • Connections: 1/4" O.D.; 5/32" I.D. poly tubing • Dimensions: 1-7/8" W x 2-1/16" H x 2-9/64" D

Each

Order # Mfg. #

Model #

Description

L38-494 2360-501

R516

Reversing Relay

545.00

Barber-Colman Pneumatic to Electric Switching Relay • Converts gradual pressure change into positive electric switching action • SPDT switch action • 3 to 25 PSI setpoint range with 2 PSI fixed differential • May be wall or panel mounted Specifications: • Maximum supply air: 30 PSI • Switch rating: 21A non-inductive @

120/240/480VAC; 1 HP @ 120VAC; 2 HP @ 240VAC • Dimensions: 2-1/2" W x 3-11/16" H x 2-7/16" D

Each

Order # Mfg. #

Model # R471-1

Description

L38-495 2364-211

Pneumatic to Electric Switching Relay

579.00

Barber-Colman PNEUMODULAR ® Gradual Switch • Manually sets output pressure from 0 to 20 PSI

Specifications: • Maximum supply air: 30 PSI • Air consumption: 1 SCFH • Air capacity: 8 SCFH

• May be flush mounted to a panel face, on a Pneumodular ® socket, or on a bracket for surface mounting

• Connections: 1/4" O.D.; 5/32" I.D. poly tubing • Dimensions: 1-7/8" W x 2-1/16" H x 3-1/2" D

Each

Order # Mfg. #

Model #

Description

L38-499 2390-501

S510

Gradual Switch 0 to 20 PSI Output

1145.00

421

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