Bm oval series – Brooks Instrument BM50 User Manual
Page 9
1-1
Section 1 Introduction
Installation and Operation Manual
X-PD-BM-Ovals-eng
Part Number: 541B031AAG
January, 2009
BM Oval Series
1-1 Purpose
The Brooks
®
BM Series Flowmeters, hereafter called flowmeters, are
positive displacement meters that measure extremely low flows of clean
liquid with high accuracy. The flowmeter generates an electrical signal
proportional to flow for use with a wide variety of electronic
instrumentation.
1-2 Description
The flowmeters have incorporated the oval rotor principle into its design.
This has proven to be a reliable and highly accurate method of measuring
flow. Exceptional repeatability and high accuracy over a wide range of
viscosities and flow rates are features of the flowmeters.
The low pressure drop and high pressure rating means the flowmeters are
suitable for both gravity and pump (in line) applications.
1-3 Specifications
Capacities (See Table 1-1): Capacities,
For capacities with higher viscosity, (Refer to Table 1-8)
Performance
Accuracy:
+/-0.5% when viscosity is >5 cP
+/-1% when viscosity is <5 cP
Pressure Drop
<3 psi at full scale flow when viscosity is 1 cP or less and not more than
15 psi at 1000 cP.
Ratings:
Maximum working pressure: See Table 2 Maximum working temperature:
See Table 2 Ambient Temperature: -4° F to 104° F (-20° C to +40° C)
Meter sizes BM04, BM07, BM10 & BM50 have been subected to a 4 times
maximum working pressure test. Meter size BM40 has been subjected to a
3 times maximum working pressure test.
Pressure Equipment Directive (97/23/EL)
Meter Classifications - PED
Table 1-1 Capacities
Model
PED Category
BM01/02
SEP
BM04
SEP
BM07
SEP
BM10
SEP
BM40
Category 1
BM50
Category 1
Model
Viscosity
BM04
BM07
BM10
BM40
BM50
< 5cp
.79 to 6.6 gpm
2 to 18.5 gpm
2.6 to 26 gpm
4 to 62 gpm
7.93 to 79.25 gpm
(3 to 25 lpm)
(8 to 70 lpm)
(10 to 100 lpm)
(15 to 235 lpm)
(30 to 300 lpm)
5 to 1000cp
.26 to 7.93 gpm
.8 to 21 gpm
1.6 to 32 gpm
2.6 to 66 gpm
3.96 to 92.46 gpm
(1 to 30 lpm)
(3 to 80 lpm)
(6 to 120 lpm)
(10 to 250 lpm)
(15 to 350 lpm)