FMA6540ST datasheet(2/4 Pages) OMEGA

2 / 4 page

D-XX

Contact Closure

Two sets of dry contact relay

outputs are provided to actuate

user supplied equipment. These are

programmable via the digital interface

such that the relays can be made to

switch when a specified event occurs

(e.g. when a low or high flow alarm

limit is exceeded or when the totalizer

reaches a specified value).

Valve Override

Means are provided to force the

control valve fully open (purge) or

fully closed via either the analog or

digital interfaces.

Self Diagnostics

Whenever power is first applied,

the FMA6500ST runs a series

of self diagnostic tests to

ensure that it is in optimum

working condition.

Engineering Units

The flow setpoint, measured gas

flow and associated totalizer data

is scaled directly in engineering

units via digital interface com-

mands. The following units of

measure are supported: % of

FS, mL/min, mL/hr, scfm, scfh, sL/

min, sL/hr, lbs/hr, lbs/min, and one

user defined unit of measure.

Leak Integrity

1 x 10-9 smL/sec of helium

maximum to the outside

environment.

Balanced Power Supply

The FMA6500ST operates on

±15 Vdc. The current requirements

for the positive and negative power

supplies are balanced such that

the current in the power supply

common connection is minimized.

Maximum power consumption is

13.5 watts at ±15 Vdc.

Auto Zero

The FMA6500ST automatically

nulls the sensor zero offset

whenever the flow setpoint is below

2% FS. To accommodate this feature

the control valve must fully close

under that condition. Provisions are

made to either disable, force, or store

thecurrent auto zero via digital

commands.

Totalizer

The firmware for the FMA6500ST

provides functions to register total gas

quantity. The total mass of gas is

calculated by integrating the actual

gas flow rate with respect to time.

Digital interface commands are

provided to: set the totalizer to zero,

start/stop totalizing the flow, read the

totalizer, start the totalizer at a preset

flow, and stop the flow at a preset

total.

Multi-Gas Calibration Option

The FMA6500ST is capable of

storing primary calibration data for

up to 10 gases. This feature allows

the same FMA6500ST to be calibrated

for multiple gases while maintaining

the rated accuracy on each.

Standard 10-Point NIST

Calibration

Optional up to 9 additional 10-point

calibration may be ordered at an

additional cost per gas.

Conversion Factors

Conversion factors for up to 256 gases

are stored in the FMA6500ST.

Conversion factors may be applied

to any of the ten gas calibrations via

digital interface commands.

Flow Alarms

High and Low gas flow ALARM

limits are programmed using the

digital interface. Alarm conditions

are reported via the digital interface

or can activate the contact closure

outputs.

Programmable Flow

OMEGA® software supports

programmable flow modes, allowing

execution of custom programming

of up to ten steps. Various flow

configurations include ramping,

linearized increasing, and

decreasing modes.

Autotune

The autotune function allows the

FMA6500ST to automatically

optimize control response for the gas

under actual process conditions.

During the autotune process, the

instrument adjusts PID gains for

optimum step response and deter-

mine key control valve characteristics

(only available on units with less than

80 L/min maximum flow).

FMA6502ST, shown

smaller than actual size.

SPECIFICATIONS

Accuracy (including linearity):

15 to 25°C (59 to 77°F) and 0.7 to 4 bar

(10 to 60 psia): ±1% of FS, 0 to 50°C

(32 to 122°F) and 0.3 to 10 bar (5 to

150 psia): ±2% of FS, ±1% of FS at a

specific temperature and pressure

with special calibration

Repeatability: ±0.15% FS

Turndown Ratio: 50:1

Response Time: 0.6 to 1.0 s to within

±2% of setpoint over 20% to 100% FS

Temperature Coefficient:

0.05% of full scale/°C or better

Pressure Coefficient: 0.01% FS/psi

(0.07 bar) or better

Leak Integrity:

1 x 10-9 smL/sec Helium maximum to the

outside environment

Optimum Gas Pressure:

1.73 bar (25 psig)

Maximum Gas Pressure: 34.5 bar

(500 psig)

Maximum Diff. Pressure: 3.4 bar (50

psig) for up to 10 LPM, 2.8 bar (40 psig)

for 15 LPM and greater

Gas and Ambient Temperature:

5 to 50°C (41 to 122°F)

Output Signals: Linear 0 to 5 Vdc

(2000 Ω min load impedance);

0 to 10 Vdc (4000 Ω min impedance);

4 to 20 mA optional (0 to 500 Ω loop

resistance)

Communication Interface:

RS485, standard; RS232, optional

Transducer Input Power:

±15 Vdc, 450 mA maximum

Wetted Parts: 316 stainless steel,

416 stainless steel, FKM O-rings

Neoprene or Perfluoroelastomer

O-rings optional

Connections: Standard ¹⁄₄"

compression fittings up to 30 LPM

models; for 60 LPM models and greater:

³⁄₈

" compression fittings

Circuit Protection:

Circuit boards have built-in polarity

reversal protection; resettable fuses

provide power input protection

Calibration Options:

Standard 10-point NIST calibration

optional up to 9 additional 10-point

calibrations may be ordered for a

additional cost per gas

FMA6540ST Datasheet(PDF) 2 Page - Omega Engineering, Inc.

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