Honeywell P643 Catalog Page

Pneumatic Switches

M27128

KNOCKOUT FOR 1/2 IN. (13) CONDUIT (TOP, BOTTOM, AND BACK)

(COVER REMOVED)

2-7/8 (73)

2-3/4

(70)

(178)

3-5/8

(92)

5/8 (16)

FOR 1/4 (6) O.D. TUBE

3-13/16

(97)

PLUGGED TEE

MOUNTING HOLES

MOUNTING HOLE

P643 Pneumatic/Electric Switch

Used to convert a pneumatic signal from a controller to an electrical switching action to provide start and stop control of equipment such as fans and pumps. Replacement devices available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell pneumatic/electric switches. Adjustable setpoint.

• Adjustable differential.

• Externally visible scales.

• Heavy-duty switch.

• Integral gage connection.

Dimensions in inches (millimeters) P643A Typical Piping

CONTROLLER BRANCH LINE

M5436

Air Connections: Compression fitting 1/4 in. (6 mm) O.D. tubing Current: 120 Vac: 8.0 AFL, 48.0 LRA, 17.0 A resistive; 208/240 Vac:

5.1 AFL, 30.6 ALR, 17.0 A resistive; 270 Vac: 17.0 A resistive; 480 Vac: 3.5 AFL, 21.0 ALR, 10.0 A resistive

Frequency: 50 Hz; 60 Hz Temperature Range: -30 F to +125 F (-34 C to +52 C) Maximum Safe Operating Pressure: 25 psi (170 kPa) Switch Operation:

action

Switch Type: Pneumatic/Electric Switch Mounting: Holes in back of case

Approvals: Underwriters Laboratories, Inc:

Converts pneumatic signal to electrical switching

B W R

TO OTHER CONTROLLED DEVICES

TO CONTROL SIDE OF FAN MOTOR STARTER

Listed SDFY

Pneumatic

Differential Pressure Range Switching Pressures

Product Number Electrical Connections

Includes(psi) (kPa) (psi) (kPa)

P643A1007/U Knockouts (3) for 1/2 in. conduit 3 to 13 psi adjustable 20 to 90 kPa adjustable 0 to 22.5 psi 0 to 155 kPa SPDT switch

70-6910 689

Controls