Switches
Humidistats
and
Thermostats Controllers Sensors Relays Switches Actuators Valves Accessories
Engineering
Guide
Cross
Reference
70-6925 65
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
Air Connections: Compression fitting 1/4 in. (6 mm) O.D. tubing
Mounting: Holes in back of case
Operating Humidity Range (% RH): —
Temperature Range: -30 F to +125 F (-34 C to +52 C)
Maximum Safe Operating Pressure: 25 psi (170 kPa)
Switch Operation: Converts pneumatic signal to electrical switching
action
Switch Type: Pneumatic/Electric Switch
Frequency: 50 Hz; 60 Hz
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
Approvals:
Underwriters Laboratories, Inc.
Listed
M27128
KNOCKOUT FOR 1/2 IN. (13) CONDUIT
(TOP, BOTTOM, AND BACK)
(COVER REMOVED)
2-7/8 (73)
2-3/4
(70)
7
(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
M5436
TO CONTROL
SIDE OF FAN
MOTOR STARTER
B
W
R
TO OTHER
CONTROLLED
DEVICES
CONTROLLER
BRANCH LINE
Product
Number
Electrical
Connections
Differential Pressure
Range Switching Pressure
Voltage Description Includes(psi) (kPa) (psi) (kPa)
P643A1007 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 120 Vac;
208 Vac;
240 Vac;
277 Vac;
480 Vac
Pneumatic / Electric Switch including
Spdt switch and adjustable differential
SPDT switch
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