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                                          Advanced Specialty Gas Equipment

                                          DELIVERY SYSTEM ACCESSORIES
                                          Models SG6520, SG6521
                                          Pressure Gauges with Reed Switch

                                          SG6520-3000 Gauge SwitchThese indicating pressure gauges with reed contact assemblies are designed to provide economical pressure monitoring, set-point indication and fast switching for low power electrical signals. In addition to providing accurate indication of gas pressure, these 21/2 inch diameter gauges incorporate a magnetically actuated reed switch capable of operating low voltage annunciators, lights or relays. They are commonly installed on regulators and manifolds to activate an external alarm (such as Models SG6551A, SG6552 Annunciators) when a certain predetermined pressure is reached.

                                          The switch set point can be adjusted to any pressure between 2% and 90% of the full-scale value by moving the index on the front dial to the desired set point. On decreasing pressure only, the magnetic indicating pointer "opens" the switch when contact is made with the index. The gauge is designed to move further on the scale while permitting the switch to remain "open" after contact is made with the index.

                                          Warning: We strongly recommend the use of our Explosion-Proof Type Pressure Switch Model SG6541 for all flammable and oxygen applications.


                                          Specifications
                                          Mechanical
                                          Dial Size: 21/2" diameter

                                          Gauge Pressure Range

                                          Adjustable Set-Point

                                          Indication Accuracy: ± 2% of span

                                          Operating Temp. Range: -20°F to 165°F

                                          Case and Bayonet Ring: Type 304 Stn. Stl.

                                          Window: Laminated safety glass retained in
                                             bayonet ring

                                          Safety Feature: Solid front and full blow-out
                                             safety back

                                          Dial: Aluminum alloy, white background,
                                             black markings

                                          Bourdon Tube:
                                             SG6520: Bronze
                                             SG6521: Type 316 Stainless Steel

                                          Socket:
                                             SG6520: Brass
                                             SG6521: Type 316 Stainless Stee

                                          Connection Size: 1/4" NPT male

                                          Electrical
                                          Connection: 39" lead connection cable with 2 wires
                                          Maximum Switching:
                                             Capacity: 10 watts (DC), 10 VA (AC)
                                             Current: 0.5 amps DC or AC with resistive load
                                          Voltage: 75 Volts DC or 50 Volts AC
                                          Dead Band: 2.5% maximum
                                          Switch Operation: closes on increasing
                                          pressure / opens on decreasing pressure
                                          Model SG6520, SG6521

                                          Table I
                                          Part Number   Pressure Case Connection Adjustable Set-point
                                          Brass Stainless Steel Range (psig) Configuration Location Min (psig) Max (psig)
                                          SG6520-200-P SG6521-200-P 0–200 Panel Mount Lower Back 4 180
                                          SG6520-600-P SG6521-600-P 0–600 Panel Mount Lower Back 12 540
                                          SG6520-3000-P SG6521-3000-P 0–3000 Panel Mount Lower Back 60 2700
                                          SG6520-3000 SG6521-3000 0–3000 Radial Bottom 60 2700
                                           

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