POTTER PS120A Series High Low Pressure Switch Owner’s Manual

POTTER PS120A Series High Low Pressure Switch

PS120-1A Single Switch – Stock No. 1341201
PS120-2A Double Switch – Stock No. 1341202

UL, cUL, and CSFM Listed, FM and LPC Approved, NYMEA Accepted, CE Marked

• Dimensions: 4 3/4″ (12,1cm)W x 2 1/4″ (5,7cm)D x 4 3/8″ (11,1cm)H
• Enclosure:

  •   * Cover – Die-cast with textured red powder coat fi nish

  • Base – Plated Steel
• Pressure Connection: 1/2″ NPT Male
• Factory Adjustment:
  • PS120-1A: Operates on decrease at 110 PSI (7,6 BAR)
  • PS120-2A: Operates on increase at 130 PSI (9 BAR), and on decrease at 110 PSI (7,6 BAR
• Pressure Range: 10 – 175 PSI (0,7 – 12,1 BAR)
• Maximum Differential: Approx. 2 lbs. at 20 PSI (0,14@1,4 BAR) 5 lbs. at 175 PSI (0,35@12,1 BAR)
• Maximum System Pressure: 250 PSI (17,2 BAR)
• Switch Contacts: SPDT (Form C) 15.0 Amps at 125/250VAC, 2.5 Amps at 30VDC One set in PS120-1A, Two sets in PS120-2A
• Environmental Specifications:
  • Indoor or outdoor use
  • NEMA 4/IP55 Rated Enclosure – when used with proper conduit fittings
  • Temperature Range: -40°F to 140°F (-40°C to 60°C) (Not for use in hazardous locations)
• Service Use:
  • Automatic Sprinkler NFPA-13
  • One or two family dwelling NFPA-13D
  • Residential occupancy up to four stories NFPA-13R
  • National Fire Alarm Code NFPA-72
• Tamper: Cover incorporates tamper resistant fasteners that require a special key for removal. One key is supplied with each device. For optional cover tamper switch kit, order Stock No. 0090134.

The Potter PS120A Series are pressure actuated switches designed primarily to detect a 10 PSI (0,7 BAR) increase and/or decrease from normal system pressure in automatic fi re sprinkler systems.
Typical applications are pressure supervision in systems with excess pressure.

INSTALLATION AND TEST PROCEDURES

• Mounting: Device should be mounted in upright position (threaded connection down).
  Requires NEMA type 4 conduit hub for outdoor installations.

• Wet System (with excess pressure): Connect PS120A in the excess pressure line on the system side of any shut-off or check valve.
  Provision for testing the unit can be accomplished with the installation of a Potter Bleeder Valve (Model BVL) in the line to the PS120A.

• Testing: The operation of the pressure supervisory switch should be tested upon completion of installation and periodically thereafter in accordance with the applicable NFPA codes and standards and/or the authority having jurisdiction (manufacturer recommends quarterly or more frequently).
  CAUTION: Testing the PS120A may activate other system connected devices.

DIMENSIONS

NOTE:
TO PREVENT LEAKAGE, APPLY TEFLON TAPE SEALANT TO MALE THREADS ONLY.

WARNING:
USE OF PIPE JOINT CEMENT MAY RESULT IN OBSTRUCTION OF APERTURE AND LOSS OF SIGNAL.
FIELD ADJUSTMENTS: The operating point of the switch (or switches on the PS120-2A) can be adjusted to any point between 10 and 175 PSI by turning the adjustment knob(s) clockwise to raise the actuation point, and counter- clockwise to lower the actuation point. In the case of the PS120-2A, the two switches operate completely independently of one another, and each switch may be adjusted to actuate at any point the system requires. Final adjustment should be made with a pressure gauge.

Typical Sprinkler Application

Pressure Switch Terminations

Typical Electrical Connections

Ordering Information

Switch Terminal Connections Clamping Plate Terminal

CAUTION:
An uninsulated section of a single conductor should not be looped around the terminal and serve as two separate connections. The wire must be severed, thereby providing supervision of the connection in the event that the wire becomes dislodged from under the terminal.

Engineer/Architect Specifi cations

Pressure supervisory switch shall be a Model PS120A as manufactured by Potter Electric Signal Co. of St. Louis, MO and shall be installed on the sprinkler systems as shown on the drawings and/or as specifi ed herein.
Switches shall be provided with a 1/2″ NPT male pressure connection and shall be connected into the excess pressure supply line on the system side of any shut off valve. A Model BVL Bleeder Valve as supplied by Potter Electric Signal Co. of St. Louis, MO or equivalent shall be connected in line with the PS120A to provide a means of testing the operation of the supervisory switch.
The switch unit shall contain SPDT (Form C) switch(es). One switch shall operate at a pressure decrease of 10 PSI (0,7 BAR) from normal. If two switches are provided, the second switch shall operate at a pressure increase of 10 PSI (0,7 BAR) from normal. Switch contacts shall be rated at 15.0 Amps at 125/250VAC and 2.5 Amps at 30VDC. The unit shall have a maximum pressure rating of 250 PSI (17,2 BAR) and shall be adjustable from 10 to 175 PSI (0,7 – 12,1 BAR).
The switch housing shall be weatherproof and oil resistant. The cover shall incorporate tamper resistant screws.
The unit shall be UL and CSFM Listed, FM and LPC Approved, and NYMEA Accepted.

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References

• Fire Alarm Resources | Download fire alarm documents
• Potter Electric: Fire Alarms & Fire Sprinkler Systems

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