Brooks Instrument 2540-I User Manual

Installation and Operation Manual

X-VA 2540-eng
Part Number: 541B166AAG
May, 2011

Brooks® 2540 Flowmeters

Brooks® Model 2540

Acrylic block flowmeters are available in various ranges
in both SAE and SI units for air and water (see chart on
other side). These direct reading meters are also
available for other gases and liquids. If the meter will be
used with fluids other that air or water, please consult
chemical compatibility data for possible effects on the
meter. When properly installed and maintained, these
durable acrylic

SPECIFICATIONS

ACCURACY: ± 2% Full Scale
FLOATS: Stainless Steel
WETTED METAL
PARTS:
METER BODY: Clear Acrylic
FITTINGS:
ELASTOMERS: Buna-N
MOUNTING INSERTS:
MAXIMUM
TEMPERATURE:
MAXIMUM PRESSURE: 100 PSI (690 kPa)

Stainless Steel

1-11 1/2 FNPT PVC Fittings

10-32 UNF
150°F (65 °C)

INSTALLATION
These meters are supplied with round 1-11 ½ FNPT
inlet and outlet fittings. When installing the meter,
securely hold the meter's fittings from rotating while
connecting the flow lines. (Use pipe thread sealant or
Teflon® tape to achieve a positive seal when connecting
the flowmeter.) Failure to hold the meter fittings or
over-tightening may cause damage to the fitting,
flowmeter or both; which will result in leaks or meter
failure. The meter is supplied with #10-32 threaded
inserts for mounting. When installing, use slotted
screws and torque to a maximum of 35 in-lbs. Mounting
dimensions are shown in Figure 1.

CLEANING AND DISASSEMBLY

Occasional cleaning may be required if dirt appears in
the flow tube or if float movement becomes restricted.
To clean, remove the top plug (standard back) or the
outlet fitting (inline) and remove the rod guide
assembly. Wash the tapered hole, float stops and top
plug with a mild liquid detergent and soft brush. Rinse
all parts with clean water and dry thoroughly with clean
air or nitrogen. Do not use solvents to clean this meter
as they will attack the acrylic and destroy the meter

UNPACKING

Precautions have been taken to prevent any damage
from occurring during shipment. However, if the meter
is received damaged, report it to the carrier
immediately. Before installing, verify that you have the
model and flow range required.

ACHIEVING ACCURATE FLOWRATES

To obtain an accurate flowrate, the float must be read at
the position indicated on the meter. Additionally, the
flowmeter should be installed in a manner, which
minimizes both external vibrations and internal flow
variations. Special care should be taken so that the
connections to the meter's inlet and outlet fittings do not
overly restrict the liquid or gas flow being metered. This
could result in a reduced flow volume, preventing the
meter from reaching its maximum flowrate.
Furthermore, internal pressures could be affected,
which can cause inaccurate flow readings. On start-up,
slowly purge any fluid trapped in the meter.

REASSEMBLY

Check to make sure that all parts are clean and dry. To
lubricate the O-rings, apply a small amount of
halocarbon grease prior to reassembly. Replace the
float on the rod guide and reinstall the float stops.
Reinstall the rod guide assembly into the flowmeter
body. Make sure the rod guide is seated firmly in the
body of the meter for a Standard Back meter or in the
inlet fitting of the Inline meter. (For meters with valves,
it will be necessary for the rod guide to pass through the
slot in the valve tip.) To allow proper use of the valve,
do not tighten the valve tip completely on the valve
stem. Reinstall the top plug or the outlet fitting, making
sure that the rod guide is properly aligned.

Brooks® 2540 Flowmeters

Installation and Operation Manual

X-VA-2540-eng

Part Number: 541B166AAG

May, 2011

2

1" FEMALE NPT
OUTLET CONNECTION

10-32 THREADED

INSERTS (3 PLACES)

10 1/213 1/2

1" FEMALE NPT

OUTLET CONNECTION

1 1/8

1 5/8

4 1/2

3

10 29/32

10 1/2

2

4 3/4

3 1/2

INSERTS (3 PLACES)

1" NPT I/O
CONNECTIONS

10-32 THREADED

8 17/32

7/8

1 1/8

4 1/2

3

1 3/4

Figure 1 Dimensions for Brooks 2540 Flowmeters

Due to Brooks Instrument’s continuous improvement of our products, all specifications are subject to change without
notice.

If you have any questions regarding installation, maintenance, replacement or use of this flowmeter, please visit our
website at

www.BrooksInstrument.com for Customer Service contact information.