Series PG Gas Pressure/Differential Pressure Switch

Gas Pressure/Differential Pressure Switch
External Adjustment, Visible Dial, Hermetically Sealed Snap or Mercury Switch

External Adjustment, Visible Dial, Hermetically Sealed Snap or Mercury Switch

Large sensitive diaphragm and reliable, time proven mechanical design are combined in SERIES PG pressure/differential pressure switches. For use with air and other compatible gases, they feature excellent ±1% of full scale repeatability, clear easy-to-read scale and convenient external setpoint adjustment.

Application flexibility is assured by a large variety of switching options including SPST, SPDT, DPST and DPDT; opening or closing on increasing pressure, vacuum or differential. PR and PRL models add manual reset operation on increasing or decreasing pressure. Mercury switches or hermetically sealed snap switches are available where high humidity would be a problem. If vibration or other factors preclude the use of mercury, snap switches can be provided. Standard housing is NEMA 1. Optional enclosures can be supplied for weather resistant and explosion-proof requirements.

Product Applications

  • Natural, manufactured or LP gas applications
More Information
Model Chart
EXAMPLEPG 153P1 PG-153-P1 (Vacuum) (Pressure) (Differential Pressure) Control, fixed deadband, automatic reset, SPDT mercury switch, adjustable range 1.0-30" w.c. (25-760 bar).
MODELPG    General purpose enclosure, NEMA-1 (standard)
PR    Manual reset, operates on pressure increase automatically, resets on decrease1
PRL    Manual reset, operates on pressure decrease automatically, resets on increase1
HOUSING
OPTIONS
 W   Weather-resistant enclosure, NEMA-2, 3R
CIRCUIT
(SWITCHING)
OPTIONS

(For Electrical
Codes see Chart
Below)
  2  SPST mercury switch, elect. code K†, opens on vacuum, pressure or differential pressure increase
  2P  SPST mercury switch, elect. code L†, opens on vacuum, pressure or differential pressure increase
  3  SPST mercury switch, elect. code K†, closes on vacuum, pressure or differential pressure increase
  3P  SPST mercury switch, elect. code L†, closes on vacuum, pressure or differential pressure increase
  153  SPDT mercury switch, elect. code M†
  103  DPST, two SPST mercury switches, elect. code L†, both close on increase, FM approved, PG, PGW only
  105  DPST, two SPST mercury switches, one elect. code L†, one elect. code N, both open on decrease
  119  (2) Mercury Switches, SPST NO (DPST)
  127  DPST, two SPST mercury switches, elect. code L†, both open on increase
  129  DPST, two SPST mercury switches, one elect. code L†, one elect. code N, both open on increase
  131  (2) Mercury Switches, SPST NC (DPST)
  152  (1) Mercury Switch, SPDT (4-wire)
  156  SPDT, two SPST mercury switches, elect. code L†, one- opens on increase, one closes on increase
  158  SPDT, two SPST mercury switches, one elect. code L† - opens on increase, one elect. code N - closes on increase
  161  SPDT, two SPST mercury switches, one elect. code L† - opens on decrease, one elect. code N - closes on decrease
  190  (2) Mercury Switches, SPST NC; SPST NO (SPDT)
  804  DPDT, two SPDT mercury switches, elect. code M†
  (__)  Other circuits available, consult factory
  7000-153  SPDT, snap acting switch, rated 15A at 120 VAC, 8A at 240 VAC, 0.5A at 120 VDC, .25A at 240 VDC (1)
  7000-153HS  SPDT, Hermetically sealed snap switch, rated 5A at 125/250 VAC, 5A resistive at 30 VDC
  7000-153HG  SPDT, Hermetically sealed gold contact snap switch, rated 1A at 125 VAC, 1A resistive at 30 VDC
  7200-804  DPDT, two SPDT snap acting switches, rated 5A at 120/240 VAC, 30 VDC resistive (1)
ADJUSTABLE DIFFERENTIAL
PRESSURE RANGES WITH MAXIMUM
SUSTAINED PRESSURES
   P1 Adjustable range 1.0-30" w.c. (25-760 bar), maximum sustained pressure 2 psig* (0.14 bar)
   P2 Adjustable range 0.5-5 psig (.03-.35 bar), maximum sustained pressure 10 psig* (0.69 bar)
   P3 Adjustable range 2.5-76.3cm w.c.
OPTIONS    ATRAluminum Tag (Riveted)
    ATWAluminum Tag (Wired)
    PEPrep for EP
    PRESETPreset and Pressure Check Set Point
    PTPaper Tag
    STRStainless Steel Tag (Riveted)
    STWStainless Steel Tag (Wired)
    23720Fungus Proofing Special 23720
    23444O2 Acetylene Special 23444
    RCHRigid Conduit Hub
*Maximum sustained pressure 15 psig (1.0), maximum surge limit 20 psig (1.4), both ranges when used as single pressure switch with low pressure port vented to atmosphere.
1 7000-153 and 7200-804 not available with PR or PRL manual reset.
 †See Electrical Rating Chart Below.

ELECTRICAL RATINGS - Mercury Switch

CODE
RATING AC or DC
K
6A at 120 V, 3A at 240 V
L
10A at 120 V, 5 A at 240 V
M
4A at 120 V, 2A at 240 V
N
1A at 120 V, 0.5A at 240 V
Wetted Materials: Fairprene, brass, steel, and aluminum.
Temperature Limits: -10 to 180°F (-23 to 82°C).
Pressure Limit: Single Pressure Use on High Side: sustained pressure: 15 psig (1.0 bar); surge limit: 20 psig (1.4 bar). Differential Pressure Use: sustained pressure, range P1: 2 psig (.14 bar); sustained pressure, range P2: 10 psig (0.7 bar).
Enclosure Rating: General purpose. Weatherproof and explosion-proof optional.
Repeatability: ±1% of full range.
Switch Type: See Ordering page.
Electrical Rating: See Ordering page.
Electrical Connections: Screw type.
Conduit Connection: 7/8" (22.23 mm) hole for 1/2" (12.7 mm) conduit hub.
Process Connection: 1/2" male NPT and 1/8" female NPT used for single positive pressure or high differential pressure, 1/8" female NPT used for single vacuum or low differential pressure.
Mounting Orientation: Vertical.
Set Point Adjustment: External screw.
Weight: 4.5 lb (2 kg).
Deadband: See Ordering page.
Agency Approvals: UL, CSA, FM for mercury switch models. UL only on snap switch models.
  • Clear easy-to-read scale and external set point adjustment simplifies operation and trouble shooting
  • Large diaphragm provides accuracy for precise control
  • Multiple switching options meet the design of applications