American Meter Company AL-800 Installation Instructions

Medium/large diaphragm meters

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IM 3701.1

Medium/Large Diaphragm

Meter Installation Instructions

ISSUED July, 2000

METER IDENTIFICATION

The inlet and outlet of the meter are plainly marked on the top. The maximum working pressure

of the meter is given on the manufacturer's badge. It is extremely important that the maximum

working pressure not be exceeded at any time. The rated capacity of the meter at ½" and 2"

water column differential pressure is also marked on the badge. When any particular

information is desired regarding this meter, please refer to the serial number of the meter, which

is embossed on the bottom of the manufacturer's badge.

Manufacturer's Badge

In cases where condensation may collect in the line on the upstream side of the meter, the line

should be supplied with suitable drips to collect the condensate and prevent it from entering the

meter. This precaution will eliminate difficulties due to liquid entering the meter and eliminate

the possibility of damage, which may occur due to freezing of the liquids.

American Meter Company produces meters suitable for measuring high purity gases. Prior to

system startup, the meter should be purged with the gas and its outlet stream monitored until

the required purity level is achieved. After such point, further component out-gassing will be at a

diminishing rate. The primary absorbed or volatilized gases would be water vapor, air, and

smaller amounts of hydrocarbons. The flow rate, temperature, and required purity level of each

process is unique and the purchaser must determine a satisfactory purge period.

The pipe leading to the inlet of the meter should be blown clean before the meter is connected

to it. In many cases, after meters are connected, pipe turnings, scale, dirt, liquids and other

foreign materials are blown into the meter when the gas is admitted. This material will collect in

the top of the meter, on the valves, and in the bearings. If it does not create serious damage, it

will increase wear, causing the meter to lose its accuracy.

Care should be exercised in blowing drips. In some cases, blowing drips on the outlet side of

the meter has damaged the internal mechanisms of meters. A sudden reduction in pressure

due to blowing the drips or opening the outlet valve too quickly may increase the velocity

through the meter to an excessive rate, which may strain or break some of the working parts.

Table of Contents

Do you have a question about the AL-800 and is the answer not in the manual?

Page 1 American Meter Company produces meters suitable for measuring high purity gases. Prior to system startup, the meter should be purged with the gas and its outlet stream monitored until the required purity level is achieved.
Page 2 ORIFICES FOR POSITIVE DISPLACEMENT METERS Meter Type Rated Gas* Capacity at ½” Rated Gas* Capacity at 2” Orifice Diameter Differential Differential AL-800 800 CFH 1,700 CFH 0.52” AL-1000 1,000 CFH 2,200 CFH 0.58” AL-1400...
Page 3 If your meter has round dials (as shown below) and the pointer is between two numbers, always record the lower number. The one exception is if the point is between 9 & 0 (zero). You then read 9 because the zero represents the completion of a cycle. When the pointer is directly on a number, check the dial to the right.
Page 4 Pressure factors shown in table are used for converting readings obtained from meters at various pressures into quantities at a base pressure of 14.73 psi and with an atmospheric pressure of 14.4 psia. Gage Pressure Pressure Gage Pressure Pressure Gage Pressure Pressure (psig) Factor...

Al-1000Al-2300Al-1400Al-5000