• Models available for surface or panel mounting.
• Barb protected by open cage.
• All ferrous parts plated to prevent corrosion.
• Factory calibrated setpoint field adjustable to meet job requirements.
• Neoprene diaphragm element.Pneumatic/Electric Switch, 2 to 24 psi Setpoint Field Adjustable, Surface Mount| Switch Type | Pneumatic/Electric Switch |
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| Switching Action | Make R-W on pressure rise to setpoint plus differential |
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| Overview | Pneumatic-electric switches (P658A,B,E and F) used to convert a pneumatic signal from a controller to an electrical switching action (SPDT) to provide start and stop control of equipment such as fans and pumps. Replacement devices available for Johnson, P |
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| Switch Operation | Converts pneumatic signal to electrical switching action (SPDT) |
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| Electrical Connections | Screw terminals |
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| Motor Load | 1 hp @ 125 Vac, 2 hp @ 250 or 277 Vac |
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| Pilot Duty Ratings | 750 VA @ 125, 250 or 277 Vac |
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| Resistive Load | 25A @ 125, 250 or 480 Vac |
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| Setpoint Range (Field Adjustable) (psi) | 2 to 24 psi |
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| Setpoint Range (Field Adjustable) (kPa) | 14 to 165 kPa |
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| Calibration | Factory Calibrated at 10 psi |
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| Maximum Safe Operating Pressure (psi) | 30 psi |
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| Maximum Safe Operating Pressure (kPa) | 207 kPa |
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| Differential Pressure Range (kPa) | 14 kPa |
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| Differential Pressure Range (psi) | 2 psi |
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| Air connections | Barb fitting for 1/4 in. (6 mm) O.D. plastic tubing |
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| Operating Humidity Range (% RH) | 5 to 95% RH, 80 F (27C) max wet bulb |
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| Mounting | Surface (includes case) |
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| Temperature Range (F) | 40 F to 140 F |
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| Temperature Range (C) | 4 C to 66 C |
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| Dimensions (in.) | 5 3/8 in. high x 3 3/8 in. wide x 2 in. deep |
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| Dimensions (mm) | 137 mm high x 86 mm wide x 51 mm deep |
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| Approvals, Underwriters Laboratories Inc | Category SDFY or SDFY2 |
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| Approvals, Canadian Underwriters Laboratories | Listed, Volume II |
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Product Family
Cross Reference
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| Siemens Building Technologies | 251-0001 |
| Comment | Pressure Elec. Switch |
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| Manufacturer Suggested Replacements |
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