316SS or Buna-N Diaphragm, Optional Weatherproof Enclosure, Ranges from 3-20 to 50-500 psig

Low Cost and Precision Made. The A1 Pressure Control provides the flexibility required for industrial applications. The A1 pressure switch is ideal for panel mounting wherever a high quality economical open case control is required. Optional weatherproof housing meets NEMA 4X standards. Superior 15 A contact allows direct control of a motor or pump without the use of external relays - a true time and money savings. Unique features include broad temperature limits for increased application possibilities and convenient indicating scale for quick and easy field adjustment. The rugged A1S construction incorporates the feature most often requested by customers; a 316 SS diaphragm pressure element for exceptional compatibility and long service life. The A1B construction offers a lower cost Buna-N diaphragm for those applications not requiring 316 SS. Pressure chambers available are: aluminum with Teflon® impregnated hard coating perfect for oil based hydraulic fluids and non corrosive air and gases, brass for water and water based fluids, and 316 SS for harsher applications. Optional hermetically sealed snap switches are available for harsh environments.

OP enclosure and mounting configuration offers a unit that can be directly mounted through the panel wall keeping the process outside of the panel. Unit has a flush bottom and includes a gasket and mounting nut to insure a tight weatherproof seal against the panel.

Data SheetSPECIFICATIONS
Wetted Materials:
    Pressure Chamber: Aluminum with Teflon® impregnated anodized coating, brass, or 316 SS.
    Diaphragm: 316 SS on A1S, Buna-N on A1B.
    O-ring: Viton® on A1S, Buna-N on A1B.
Temperature Limit: -40 to 180°F (-40 to 82°C).
Pressure Limits: 750 psig (51 bar).
Enclosure Rating: O, and OP enclosure none. PC, PN, SC and SN enclosures meet NEMA 4X standards.
Switch Type: Type 1: SPDT snap switch. Type 1HS: SPDT hermetically sealed snap switch.
Electrical Rating: Switch Type 1: 15 A @ 120/240/480 VAC, 1/8 HP @ 125 VAC, 1/4 HP @ 250 VAC. Switch Type 1HS: 5 A @ 120/240 VAC.
Electrical Connection: Screw terminals on Type 1 switch, terminal block on Type 1HS switch.
Process Connection: 1/8" female NPT and 1/2" male NPT. OP style has 1/8" female NPT and 1/2" male straight thread.
Mounting Orientation: Within 20° of vertical.
Setpoint Adjustment: Knurled screw cap with indicating scale.
Weight: A1S: 9 oz (.25 g), A1B: 6 oz (.17 kg).
Deadband: Fixed, see deadband chart below.

Deadband Chart - psig (bar)

Model	Range	Deadband at Minimum Range	Deadband at Maximum Range
A1S or A1B with Type 1 Switch	3-20 (.21-1.4)	1 (.07)	3 (.21)
	15-150 (1.0-10.3)	5 (.34)	15 (1.0)
	25-250 (1.7-17.2)	8 (.55)	25 (1.7)
	50-500 (3.4-34.5)	15 (1.0)	50 (3.5)
A1S with Type 1HS Switch	3-20 (.21-1.4)	1.5 (.10)	4 (.28)
	15-150 (1.0-10.3)	10.5 (.72)	40 (2.8)
	25-250 (1.7-17.2)	9 (.62)	50 (3.5)
	50-500 (3.4-34.5)	14.5 (.99)	42 (2.9)
A1B with Type 1HS Switch	3-20 (.21-1.4)	2 (.14)	6 (.41)
	15-150 (1.0-10.3)	6 (.41)	25 (1.7)
	25-250 (1.7-17.2)	17 (1.17)	50 (3.5)
	50-500 (3.4-34.5)	12.5 (.86)	44 (3.0)