Digital Automatic Manifold Systems

Digital Automatic Manifold Systems
GM2-D series

GM2-D series digital automatic manifold system is designed to provide an uninterrupted gas supply. The fully automatic digital manifold system monitors cylinder bank pressure electronically, automatically changes over to secondary bank when the primary cylinder bank is depleted, and eliminates the need to manually set a priority side. In case of power failure, the system continues to supply gas without interruption. Using our second generation pressure differential switchover valve and newly designed manifold regulators boosts the flowrate and reliability of the system.


Automatic Changeover Cabinet

• Fully enclosed, tamper-resistant metal cabinet

• On-site Display: Indicator lights of system status, Gauge Pressures, visual Remote alarm box provide system status; Digital display of pressure; with changeover alarm function

• Pressure switch control

• External filter facilitates replacement of filtration elements

• Patent pending changeover technology



Silver brazing on piping joints for maximum leak prevention

System is designed to accommodate future expanison needs

System is mounted with gas filters

Pressure switch port available

Headers have been tested to withstand high cylinder pressure

• Wall or floor mount available


Standard Construction

24" flexible pressure stainless steel braided pigtails* with check valve, Rigid copper pigtails are standard when gas service is oxygen. Carbon Dioxide manifold systems are provided with H900DG electric heating regulator. Siphon cylinder should not be used in the manifold system.


GM2-DL- O2- U- ( 5L - 5R- S2 )
SeriesDelivery PressureGas ServiceStandard Code

Number of Cylinders

(left-hand / right-hand)

Manifold System Layout

Cylinder Valve Spacing
Automatic Manifold System (Digital)


L: 55 psi (0.5 MPa)

M: 100 psi (0.8 MPa)

H: 185 psi (1 MPa)

O2: Oxygen

AIR: Air

N2O: Nitrous Oxide

CO2: Carbon Dioxide

IN: Argon, Helium, Nitrogen

U: USA Standard

E: ISO Standard

UE: Canada Standard

1L-2R: One cylinder on the left, Two cylinders on the right

5L-5R: Five cylinders on the left, Five cylinders on the Right


Note: Direction of piping (Right or Left) is indicated by facing the manifold.

S: Standard layout

L: "L" Shape layout

U: "U" shape layout

D: Crossover layout

X: Staggered layout

1: 5" (127 mm)

2: 10" (254 mm)

3: 13" (330 mm)

4: 18" (457 mm)

Example: GM2-AL-O2-U-(5x5-S2) indicates a 5*5 oxygen cylinder automatic manifold system. Distance between two cylinders is 10” on standard horizontal layout. NFPA99 color code (USA)GM2-AL-O2-U-(0x0) indicates an oxygen changeover system with filters and master shutoff valves. NFPA99 color code (USA)GM2-AL-O2 indicates an oxygen changeover system only. NFPA99 color code (USA)


SeriesGas ServiceMax. Inlet Pressure psi (bar)Delivery Pressure psi (bar)Max. Delivery Flow SCFH (m3/h)Outlet ConnectionPigtail Specifications
GM2-DL-O2Oxygen300 (207)5~125 (0.35~8.6)3500 (100)3/4" NPT (M)Pigtail, CGA540
GM2-DM-AIRMedical Air300 (207)10~200 (0.7~14)3500 (100)3/4" NPT (M)Pigtail, CGA346
GM2-DL-N2ONitrous Oxide300 (207)55, 100, 185 (5, 8, 10)1750 (50)3/4" NPT (M)Pigtail, CGA326
GM2-DM-CO2Carbon Dioxide2175 (150)10~200 (0.7~14)1050 (30)3/4" NPT (M)Pigtail, CGA320
GM2-DM-INArgon, Helium, Nitrogen300 (207)10~200 (0.7~14)3500 (100)3/4" NPT (M)Pigtail, CGA580


Gas ServiceW in.(mm)H1 in.(mm)H2 in.(mm)
Oxygen, Air, Argon, Nitrogen, Helium41.3 (1050)15.8 (400)55.1 (1400)
Carbon Dioxide55.5 (1410)15.8 (400)55.1 (1400)


Standard Layout"L" Shape Layout"U"Shape LayoutCrossover LayoutStaggered Layout