{"id":18989,"date":"2026-02-03T15:00:32","date_gmt":"2026-02-03T07:00:32","guid":{"rendered":"https:\/\/dmcgas.com\/?post_type=product&p=18989"},"modified":"2026-02-03T15:20:23","modified_gmt":"2026-02-03T07:20:23","slug":"honeywell-gas-meter-al425","status":"publish","type":"product","link":"https:\/\/dmcgas.com\/en\/product\/honeywell-gas-meter-al425\/","title":{"rendered":"Honeywell Elster AL425 Gas Flowmeter 25psi Natural Gas Diaphragm Meter\u200c"},"content":{"rendered":"

AL-425 Diaphragm Meter\u200c<\/p>\n

Product Overview\u200c
\nThe AL-425 Diaphragm Meter is designed for metering a variety of gases in large residential or small commercial applications. It operates at pressures up to 25 PSIG and flow rates up to 425 SCFH at a differential pressure of 1\/2\u201d W.C.<\/p>\n

Key Features\u200c<\/p>\n

Die-cast aluminum case
\nOil-impregnated, self-lubricating bushings
\nMolded, convoluted diaphragms for smooth operation and long life
\nRigid, reinforced flag rods for positive alignment and sustained accuracy
\nGraphite-filled phenolic valves to minimize wear
\nLong-life, low-friction grommet seals
\nSingle-coat polyester primer with high-solids polyurethane top coat
\nSecurity seals that indicate tampering<\/p>\n

Advantages\u200c<\/p>\n

Temperature compensation available from -30\u00b0F to 140\u00b0F (-34\u00b0C to 60\u00b0C)
\nCapacity: 425 SCFH (12.0 m\u00b3\/h) for 0.60 specific gravity gas at 1\/2-inch W.C. differential
\nAMI\/AMR compatibility
\nMeets ANSI B109.1 specifications
\nMeasurement Canada accredited<\/p>\n

Applications\u200c
\nIdeal for larger residential or small commercial\/industrial installations. Excels in accuracy retention and life-cycle maintenance economies.<\/p>\n

Options\u200c<\/p>\n

Regular or Temperature Compensated models
\nPointer or odometer index
\n2 ft\u00b3 or 0.05 m\u00b3 drive
\nConnection sizes: 20 LT, 30 LT, 45 LT, and others
\nMaximum Allowable Operating Pressure (MAOP): 10 or 25 PSIG (690 or 1724 mBar)
\nPressure compensating indexes
\nStandard or UV-protected index covers
\nMeter bars
\nConnection sets
\nRemote Volume Pulsers
\nCenter-to-center connections: 7\u201d or 8.25\u201d<\/p>\n

Capacities (for 0.60 specific gravity gas)\u200c<\/p>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Line Pressure PSIG (mbar)<\/th>Differential Inches W.C. (mbar)<\/th>SCFH (m\u00b3\/h)<\/th>\n<\/tr>\n<\/thead>\n
0.25 (17)<\/td>1\/2 (1.2)<\/td>425 (12.0)<\/td>\n<\/tr>\n
0.25 (17)<\/td>2 (5)<\/td>898 (25.4)<\/td>\n<\/tr>\n
1 (69)<\/td>2 (5)<\/td>920 (26.1)<\/td>\n<\/tr>\n
2 (138)<\/td>2 (5)<\/td>955 (27.0)<\/td>\n<\/tr>\n
5 (345)<\/td>2 (5)<\/td>1038 (29.4)<\/td>\n<\/tr>\n
10 (690)<\/td>2 (5)<\/td>1154 (32.7)<\/td>\n<\/tr>\n
15 (1035)<\/td>2 (5)<\/td>1269 (35.9)<\/td>\n<\/tr>\n
20 (1380)<\/td>2 (5)<\/td>1367 (38.7)<\/td>\n<\/tr>\n
25 (1724)<\/td>2 (5)<\/td>1462 (41.4)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

Special Notes\u200c<\/p>\n

Propane capacity: 268 cfh (7.6 m\u00b3\/h)
\nButane capacity: 234 cfh (6.6 m\u00b3\/h)<\/p>\n

Proof Curve\u200c
\nThe AL-425 proof curve illustrates performance stability across flow rates from 0 to 500 SCFH (0\u201314.2 m\u00b3\/h), maintaining accuracy within a narrow band (96%\u2013103%).<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Brand: Honeywell
\nModel: AL425[product_badge]
\nConnection size: 1 inch (20 LT), 1.25 inch (30 LT), 1.5 inch (45 LT)
\nFlow capacity: 425 SCFH (12.0 m \u00b3\/h)
\nAllowable working pressure MAX: 10 or 25 PSI
\nTemperature compensation range: -30 \u00b0 F to 140 \u00b0 F (-34 \u00b0 C to 60 \u00b0 C)
\nMaterial: Die cast aluminum shell
\nMedium: LNG, city gas, LPG, air, inert gas, etc<\/p>\n

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