Omega FMA 4000 User Manual

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User’s Guide

FMA 4000

Digital Mass Flow Meters

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The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
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WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

TABLE OF CONTENTS

1. UNPACKING THE FMA 4000 MASS FLOW METER...................................

1.1 Inspect Package for External Damage.................................................

1.2 Unpack the Mass Flow Meter...............................................................

1.3 Returning Merchandise for Repair.......................................................

2. INSTALLATION........................................................................................

2.1 Primary Gas Connections.................................................................

2.2 Electrical Connections......................................................................

2.2.1 Power Supply Connections..............................................................

2.2.2 Output Signals Connections..............................................................

2.2.3 Communication Parameters and Connections...................................

3. PRINCIPLE OF OPERATION...................................................................

4. SPECIFICATIONS...................................................................................

5. OPERATING INSTRUCTIONS..................................................................

5.1 Preparation and Warm Up..................................................................

5.2 Swamping Condition.......................................................................

5.3 FMA 4000 Parameters Settings...........................................................

5.3.1 Engineering Units Settings...............................................................

5.3.2 Gas Table Settings..............................................................................

5.3.3 Totalizer Settings.............................................................................

5.3.4 Flow Alarm Settings........................................................................

5.3.5 Relay Assignment Settings..............................................................

5.3.6 K Factors Settings...........................................................................

5.3.7 Zero Calibration...............................................................................

5.3.8 Self Diagnostic Alarm.......................................................................

5.4 Analog output Signals configuration...................................................

6. MAINTENANCE.........................................................................................

6.1 Introduction......................................................................................

6.2 Flow Path Cleaning...........................................................................

6.2.1 Restrictor Flow Element (RFE)........................................................

6.2.2 FMA 4000 model.............................................................................

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7. CALIBRATION PROCEDURES.................................................................

7.1 Flow Calibration...............................................................................

7.2 Gas Calibration of FMA 4000 Mass Flow Meter................................

7.2.1 Connections and Initial Warm Up.....................................................

7.2.2 ZERO Check/Adjustment Adjustment.................................................

7.2.3 Gas Linearization Table Adjustment.................................................

7.3 Analog output Calibration of FMA 4000 Mass Flow Meter..............

7.3.1 Initial Setup.......................................................................................

7.3.2 Gas flow 0-5 Vdc analog output calibration....................................

7.3.3 Gas flow 4-20 mA analog output calibration...................................

8. RS485 / RS232 SOFTWARE INTERFACE COMMANDS.........................

8.1 General............................................................................................

8.2 Commands Structure.........................................................................

8.3 ASCII Commands Set.........................................................................

9. TROUBLESHOOTING................................................................................

9.1 Common Conditions........................................................................

9.2 Troubleshooting Guide.....................................................................

9.3 Technical Assistance.......................................................................

10. CALIBRATION CONVERSIONS FROM REFERENCE GASES...................

APPENDIX I OMEGA FMA 4000 EEPROM Variables..............................

APPENDIX II INTERNAL USER SELECTABLE GAS FACTOR TABLE

(INTERNAL “K” FACTORS)........................................................

APPENDIX III GAS FACTOR TABLE (“K” FACTORS)....................................

APPENDIX IV COMPONENT DIAGRAM......................................................

APPENDIX V DIMENSIONAL DRAWINGS.................................................

APPENDIX VI WARRANTY...........................................................................

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TRADEMARKS

Buna-N®-is a registered trademark of DuPont Dow Elastomers.
Kalrez®-is a registered trademark of DuPont Dow Elastomers.

Neoprene

®

-is a registered trademark of DuPont.

Omega

®

-is a registered trademark of Omega Engineering Inc.

1

1. UNPACKING THE FMA 4000 MASS FLOW METER

1.1 Inspect Package for External Damage

Your FMA 4000 Mass Flow Meter was carefully packed in a sturdy cardboard car­ton, with anti-static cushioning materials to withstand shipping shock. Upon
receipt, inspect the package for possible external damage. In case of external
damage to the package contact the shipping company immediately.

1.2 Unpack the Mass Flow Meter

Open the carton carefully from the top and inspect for any sign of concealed ship­ping damage. In addition to contacting the shipping carrier please forward a copy
of any damage report to Omega7 directly.

When unpacking the instrument please make sure that you have all the items
indicated on the Packing List. Please report any shortages promptly.

1.3 Returning Merchandise for Repair

Please contact an OMEGA7 customer service representative and request a

Return Authorization Number (AR).

It is mandatory that any equipment returned for servicing be purged and neutral­ized of any dangerous contents including but not limited to toxic, bacterially infec­tious, corrosive or radioactive substances. No work shall be performed on a
returned product unless the customer submits a fully executed, signed SAFETY
CERTIFICATE. Please request form from the Service Manager.

2. INSTALLATION

2.1 Primary Gas Connections

Please note that the FMA 4000 Mass Flow Meter will not operate with liquids. Only
clean gases are allowed to be introduced into the instrument. If gases are con­taminated they must be filtered to prevent the introduction of impediments into the
sensor.

2

CAUTION: FMA 4000 TRANSDUCERS SHOULD NOT BE USED FOR
MONITORING OXYGEN GAS UNLESS SPECIFICALLY CLEANED AND
PREPARED FOR SUCH APPLICATION.

For more information, contact Omega7.

Attitude limit of the Mass Flow Meter is ±15Ffrom calibration position (standard
calibration is in horizontal position). This means that the gas flow path of the Flow
Meter must be within this limit in order to maintain the original calibration accura­cy. Should there be need for a different orientation of the meter, re-calibration may
be necessary. It is also preferable to install the FMA 4000 transducer in a stable
environment, free of frequent and sudden temperature changes, high moisture,
and drafts.

Prior to connecting gas lines inspect all parts of the piping system including fer­rules and fittings for dust or other contaminant’s.

When connecting the gas system to be monitored, be sure to observe the direc­tion of gas flow as indicated by the arrow on the front of the meter.

Insert tubing into the compression fittings until the ends of the properly sized tub­ing home flush against the shoulders of the fittings. Compression fittings are to be
tightened to one and one quarter turns according to the manufacturer's instruc­tions. Avoid over tightening which will seriously damage the Restrictor Flow
Elements (RFE's)!

CAUTION: For FMA 4000 model, the maximum pressure in the
gas line should not exceed 500 PSIA (34.47 bars). Applying pressure above
500 PSIA (34.47 bars) will seriously damage the flow sensor.

FMA 4000 transducers are supplied with either standard 1/4 inch, or optional 1/8
inch inlet and outlet compression fittings which should NOT be removed unless
the meter is being cleaned or calibrated for a new flow range.

Using a Helium Leak Detector or other equivalent method, perform a thorough
leak test of the entire system. (All FMA 4000's are checked prior to shipment for
leakage within stated limits. See specifications in this manual.)

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3

2.2 Electrical Connections

FMA 4000 is supplied with a 15 pin “D” connector. Pin diagram is presented in

Figure b-1.

2.2.1 Power Supply Connections

The power supply requirements for FMA 4000 transducers are: 11 to 26 Vdc,
(unipolar power supply)

DC Power (+) --------------- pin 7 of the 15 pin “D” connector
DC Power (-) --------------- pin 5 of the 15 pin “D” connector

CAUTION: Do not apply power voltage above 26Vdc.
Doing so will cause FMA 4000 damage or faulty operation.

2.2.2 Output Signals Connections

CAUTION: When connecting the load to the output terminals, do not exceed
the rated values shown in the specifications. Failure to do so might cause
damage to this device. Be sure to check if the wiring and the polarity of the
power supply is correct before turning the power ON. Wiring error may cause
damage or faulty operation.

FMA 4000 Mass Flow Meters are equipped with either calibrated 0-5 or calibrat­ed 4-20 mA output signals (jumper selectable). This linear output signal repre­sents 0-100% of the flow meter’s full scale range.

WARNING: The 4-20 mA current loop output is self-powered (non-isolated).
Do NOT connect an external voltage source to the output signals.

Flow 0-5 VDC or 4-20 mA output signal connection:

Plus (+) -------------------------- pin 2 of the 15 pin “D” connector
Minus (-) -------------------------- pin 1 of the 15 pin “D” connector

To eliminate the possibility of noise interference, use a separate cable entry for
the DC power and signal lines.

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2.2.3 Communication Parameters and Connections

The digital interface operates via RS485 (optional RS232) and provides access to
applicable internal data including: flow, CPU temperature reading, auto zero, total­izer and alarm settings, gas table, conversion factors and engineering units selec­tion, dynamic response compensation and linearization table adjustment.

Communication Settings for RS485 / RS232 communication interface:

Baud rate: ...................... 9600 baud

Stop bit: ...................... 1

Data bits: ...................... 8

Parity: ...................... None

Flow Control: ...................... None

RS485 communication interface connection:

The RS485 converter/adapter must be configured for: multidrop, 2 wire, half
duplex mode. The transmitter circuit must be enabled by TD or RTS (depending
on which is available on the converter/adapter). Settings for the receiver circuit
should follow the selection made for the transmitter circuit in order to eliminate
echo.

RS485 T(-) or R(-) ...................... pin 8 of the 15 pin “D” connector (TX-)

RS485 T(+) or R(+) ...................... pin 15 of the 15 pin “D” connector (RX+)

RS485 GND (if available) ...................... pin 9 of the 15 pin “D” connector (GND)

RS232 communication interface connection:

Crossover connection has to be established:

RS232 RX (pin 2 on the DB9 connector) ..... pin 8 of the 15 pin “D” connector (TX)

RS232 TX (pin 3 on the DB9 connector) ..... pin 15 of the 15 pin “D” connector (RX)

RS232 GND (pin 5 on the DB9 connector) ..... pin 9 of the 15 pin “D” connector (GND)

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5

PIN FMA 4000 FUNCTION

1 Common, Signal Ground For Pin 2

(4-20 mA return).

2 0-5 Vdc or 4-20mA Flow Signal Output.
3 Relay No. 2 - Normally Open Contact.
4 Relay No. 2 - Common Contact.
5 Common, Power Supply

(- DC power for 11 to 26 Vdc).

6 Relay No. 1 - Common Contact.
7 Plus Power Supply

(+ DC power for 11 to 26 Vdc).

8 RS485 (-) (Optional RS232 TX).
9 RS232 Signal GND (RS485 GND Optional).
10 Do not connect (Test/Maintenance terminal).
11 Relay No. 2 - Normally Closed Contact.
12 Relay No. 1 - Normally Open Contact.
13 Relay No. 1 - Normally Closed Contact.
14 Do not connect (Test/Maintenance terminal).
15 RS485 (+) (Optional RS232 RX).
Shield Chassis Ground.

Figure b.1 - FMA 4000 15 PIN “D” CONNECTOR CONFIGURATION

IMPORTANT NOTES:

Generally, “D” Connector numbering patterns are standardized. There are, how­ever, some connectors with nonconforming patterns and the numbering
sequence on your mating connector may or may not coincide with the numbering
sequence shown in our pin configuration table above. It is imperative that you
match the appropriate wires in accordance with the correct sequence regardless
of the particular numbers displayed on the mating connector.

Make sure power is OFF when connecting or disconnecting any cables in
the system.

The (+) and (-) power inputs are each protected by a 300mA M (medium time-lag)
resettable fuse. If a shorting condition or polarity reversal occurs, the fuse will cut
power to the flow transducer circuit. Disconnect the power to the unit, remove the
faulty condition, and reconnect the power. The fuse will reset once the faulty con­dition has been removed. DC Power cable length may not exceed 9.5 feet (3
meters). Use of the FMA 4000 flow transducer in a manner other than that spec­ified in this manual or in writing from Omega, may impair the protection provided
by the equipment.

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3. PRINCIPLE OF OPERATION

The stream of gas entering the Mass Flow transducer is split by shunting a small
portion of the flow through a capillary stainless steel sensor tube. The remainder of
the gas flows through the primary flow conduit. The geometry of the primary con­duit and the sensor tube are designed to ensure laminar flow in each branch.
According to principles of fluid dynamics the flow rates of a gas in the two laminar
flow conduits are proportional to one another. Therefore, the flow rates measured
in the sensor tube are directly proportional to the total flow through the transducer.

In order to sense the flow in the sensor tube, heat flux is introduced at two sec­tions of the sensor tube by means of precision wound heater-sensor coils. Heat is
transferred through the thin wall of the sensor tube to the gas flowing inside. As
gas flow takes place heat is carried by the gas stream from the upstream coil to
the downstream coil windings. The resultant temperature dependent resistance
differential is detected by the electronic control circuit. The measured temperature
gradient at the sensor windings is linearly proportional to the instantaneous rate
of flow taking place.

An output signal is generated that is a function of the amount of heat carried by
the gases to indicate mass-molecular based flow rates.

Additionally, the FMA 4000 Mass Flow Meter incorporates a Precision Analog
Microcontroller (ARM7TDMI7 MCU) and non-volatile memory that stores all hard-

ware specific variables and up to 10 different calibration tables. The flow rate can
be displayed in 23 different volumetric or mass flow engineering units. Flow meter
parameters and functions can be programmed remotely via the RS485/RS232
(optional) interface. FMA 4000 flow meters support various functions including:
programmable flow totalizer, low, high or range flow alarm, automatic zero adjust­ment (activated via local button or communication interface), 2 programmable
SPDT relays output, 0-5 Vdc / 4-20 mA analog outputs (jumper selectable), self
diagnostic alarm, 36 internal and user defined K-factor. Optional local 2x16 LCD
readout with adjustable back light provides flow rate and total volume reading in
currently selected engineering units and diagnostic events indication.

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4. SPECIFICATIONS

FLOW MEDIUM: Please note that FMA 4000 Mass Flow Meters are designed to work only
with clean gases. Never try to measure flow rates of liquids with any FMA 4000.

CALIBRATIONS: Performed at standard conditions [14.7 psia (101.4 kPa) and 70

F

F

(21.1

F

C)] unless otherwise requested or stated.

ENVIRONMENTAL (PER IEC 664): Installation Level II; Pollution Degree II.

FLOW ACCURACY (INCLUDING LINEARITY): ±1% of FS at calibration temperature and

pressure.

REPEATABILITY: ±0.15% of full scale.

FLOW TEMPERATURE COEFFICIENT: 0.15% of full scale/

F

C or better.

FLOW PRESSURE COEFFICIENT: 0.01% of full scale/psi (6.895 kPa) or better.

FLOW RESPONSE TIME: 1000ms time constant; approximately 2 seconds to within ±2%

of set flow rate for 25% to 100% of full scale flow.

MAXIMUM GAS PRESSURE: 500 psig (3447 kPa gauge).

MAXIMUM PRESSURE DROP: 0.18 PSID (at 10 L/min flow). See Table IV for

pressure drops associated with various models and flow rates.

GAS AND AMBIENT TEMPERATURE: 41

F

F to 122 FF (5 FC to 50 FC).

RELATIVE GAS HUMIDITY: Up to 70%.

LEAK INTEGRITY: 1 x 10-9sccs He maximum to the outside environment.

ATTITUDE SENSITIVITY: Incremental deviation of up to 1% from stated accuracy, after re-

zeroing.

OUTPUT SIGNALS: Linear 0-5 Vdc (3000 ohms min load impedance);

Linear 4-20 mA (500 ohms maximum loop resistance).
Maximum noise 20mV peak to peak (for 0-5 Vdc output).

TRANSDUCER INPUT POWER: 11 to 26 Vdc, 100 mV maximum peak to peak output
noise.

Power consumption: +12Vdc (200 mA maximum);

+24Vdc (100 mA maximum);
Circuit board have built-in polarity reversal protection, 300mA resettable fuse provide
power input protection.

WETTED MATERIALS: Anodized aluminum, brass, 316 stainless steel, 416 stainless steel,
FKM, O-rings; BUNA-N7, NEOPRENE7 or KALREZ7 O-rings are optional.

CAUTION: Omega makes no expressed or implied guarantees of corrosion
resistance of mass flow meters as pertains to different flow media reacting with
components of meters. It is the customers' sole responsibility to select the
model suitable for a particular gas based on the fluid contacting (wetted)
materials offered in the different models.

INLET AND OUTLET CONNECTIONS: Model FMA 4000 standard 1/4" compression fittings.
Optional 1/8" or 3/8" compression fittings and 1/4" VCR fittings are available.

DISPLAY: Optional local 2x16 characters LCD with adjustable backlight (2 lines of text).

CALIBRATION OPTIONS: Standard is one 10 points NIST calibration.

Optional, up to 9 additional calibrations may be ordered at additional charge.

CE COMPLIANCE: EMC Compliance with 89/336/EEC as amended.
Emission Standard: EN 55011:1991, Group 1, Class A.
Immunity Standard: EN 55082-1:1992.

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*Flow rates are stated for Nitrogen at STP conditions [i.e. 70 FF (21.1 FC) at 1 atm].

For other gases use the K factor as a multiplier from APPENDIX III.

TABLE IV PRESSURE DROPS

MODEL

FLOW RATE

[std liters/min]

MAXIMUM PRESSURE DROP

[mm H2O] [psid] [kPa]

FMA 4000 up to 10 130 0.18 1.275

CODE

scc/min [N2]

CODE

std liters/min [N2]

00 0 to 5 07 0 to 1
01 0 to 10 08 0 to 2

02 0 to 20 09 0 to 5
03 0 to 50 10 0 to 10
04 0 to 100
05 0 to 200

06 0 to 500

TABLE I FMA 4000 LOW FLOW MASS FLOW METER*

FLOW RANGES

MODEL

WEIGHT

SHIPPING WEIGHT

FMA 4000 transmitter 2.20 lbs. (1.00 kg) 3.70 lbs. (1.68 kg)

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5. OPERATING INSTRUCTIONS

5.1 Preparation and Warm Up

It is assumed that the Mass Flow Meter has been correctly installed and thor­oughly leak tested as described in section 2. Make sure the flow source is OFF.
When applying power to a flow meter within the first two seconds, you will see on
the LCD display: the product name, the software version, and revision of the EEP­ROM table (applicable for LCD option only).

Figure b-2: FMA 4000 first Banner Screen

Within the next two seconds, the RS485 network address, the analog output set­tings, and currently selected gas calibration table will be displayed (applicable for
LCD option only).

Figure b-3: FMA 4000 second Banner Screen

Note: Actual content of the LCD screen may vary depending on the
model and device configuration.

After two seconds, the LSD display switches to the main screen with the
following information:

- Mass Flow reading in current engineering units (upper line).

- Totalizer Volume reading in current volume or mass based
engineering units (lower line).

Figure b-4: FMA 4000 Main Screen

OMEGA FMA 4000 485

S: Ver1.4 Rev.A0

Ad: 11 Out: 0-5Vdc

Gas# 1 AIR

F: 50.0 L/min

T: 75660.5 Ltr

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During initial powering of the FMA 4000 transducer, the flow output signal will be
indicating a higher than usual output. This is an indication that the FMA 4000
transducer has not yet attained its minimum operating temperature. This condition
will automatically cancel within a few minutes and the transducer should eventu­ally indicate zero.

For the FMA 4000 transducer with LCD option: If the LCD diagnostic is activated,
the second line of the LCD will display the time remaining until the end of the
warm up period (Minutes:Seconds format) and will alternatively switch to Totalizer
reading indication every 2 seconds.

Figure b-5: FMA 4000 Main Screen during Sensor Warm up period.

5.2 Swamping Condition

If a flow of more than 10% above the maximum flow rate of the Mass Flow Meter
is taking place, a condition known as “swamping” may occur. Readings of a
“swamped” meter cannot be assumed to be either accurate or linear. Flow must
be restored to below 110% of maximum meter range. Once flow rates are lowered
to within calibrated range, the swamping condition will end. Operation of the meter
above 110% of maximum calibrated flow may increase recovery time.

Note: Allow the Digital Mass Flow Meter to warm-up for a MINIMUM
of 6 minutes.

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Note: During the first 6 minutes of the initial powering of the FMA 4000
transducer, the status LED will emit CONSTANT UMBER light.

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Note: After 6 minutes of the initial powering of the FMA 4000 the
transducer, status LED will emit a constant GREEN light (normal
operation, ready to measure). For FMA 4000 with LCD option, the
screen will reflect flow and totalizer reading. (see Figure b-4).

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F: 50.0 L/min

** WarmUp 2:39 **

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5.3 FMA 4000 Parameters Settings

5.3.1 Engineering Units Settings

The FMA 4000 Mass Flow Meter is capable of displaying flow rate with 23 different
Engineering Units. Digital interface commands (see paragraph 8.3 ASCII Command
Set “FMA 4000 SOFTWARE INTERFACE COMMANDS”) are provided to:

- get currently active Engineering Units

- set desired Engineering Units.

The following Engineering Units are available:

TABLE VI UNITS OF MEASUREMENT

NUMBER INDEX

FLOW RATE

ENGINEERING

UNITS

TOTALIZER

ENGINEERING

UNITS

DESCRIPTION

1 0 % %s Percent of full scale

2 1 mL/sec mL Milliliter per second

3 2 mL/min mL Milliliter per minute

4 3 mL/hr mL Milliliter per hour

5 4 L/sec Ltr Liter per second

6 5 L/ min Ltr Liter per minute

7 6 L/hr Ltr Liter per hour

87

m

3

/sec m

3

Cubic meter per second

98

m

3

/ min m

3

Cubic meter per minute

10 9

m

3

/hr m

3

Cubic meter per hour

11 10

f

3

/sec f

3

Cubic feet per second

12 11

f

3

/min f

3

Cubic feet per minute

13 12

f

3

/hr f

3

Cubic feet per hour

14 13 g/sec g Grams per second

15 14 g/min g Grams per minute

16 15 g/hr g Grams per hour

17 16 kg/sec kg Kilograms per second

18 17 kg/min kg Kilograms per minute

19 18 kg/hr kg Kilograms per hour

20 19 Lb/sec Lb Pounds per second

21 20 Lb/min Lb Pounds per minute

22 21 Lb/hr Lb Pounds per hour

23 22 User UD User defined

5.3.2 Gas Table Settings

The FMA 4000 Mass Flow Meter is capable of storing calibration data for up to 10
different gases. Digital interface commands are provided to:

- get currently active Gas Table number and Gas name

- set desired Gas Table.

5.3.3 Totalizer Settings

The total volume of the gas is calculated by integrating the actual gas flow rate
with respect to the time. Digital interface commands are provided to:

- reset the totalizer to ZERO

- start the totalizer at a preset flow

- assign action at a preset total volume

- start/stop (enable/disable) totalizing the flow

- read totalizer via digital interface

The Totalizer has several attributes which may be configured by the user.
These attributes control the conditions which cause the Totalizer to start integrat­ing the gas flow and also to specify actions to be taken when the Total Volume is
outside the specified limit.

Totalizer action conditions become true when the totalizer reading and preset
“Stop at Total” volumes are equal.

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Note: Once Flow Unit of Measure is changed, the Totalizer’s
Volume/Mass based Unit of Measure will be changed automatically.

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Note: By default the FMA 4000 is shipped with at least one valid
calibration table (unless optional additional calibrations were ordered).
If instead of the valid Gas name (for example NITROGEN), the LCD
screen or digital interface displays Gas designator as “Uncalibrated”,
then the user has chosen the Gas Table which was not calibrated.
Using an “Uncalibrated” Gas Table will result in erroneous reading.

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Note: Before enabling the Totalizer, ensure that all totalizer settings
are configured properly. Totalizer Start values have to be entered in
%F.S. engineering unit. The Totalizer will not totalize until the flow rate
becomes equal to or more than the Totalizer Start value. Totalizer Stop
values must be entered in currently active volume / mass based
engineering units. If the Totalizer Stop at preset total volume feature is
not required, then set Totalizer Stop value to zero.

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Mode Enable
/Disable - Allows the user to Enable/Disable Flow Alarm.

Low Alarm - The value of the monitored Flow in % F.S. below

which is considered an alarm condition.

Note: The value of the Low alarm must be less than the

value of the High Alarm.

High Alarm- The value of the monitored Flow in % F.S. above

which is considered an alarm condition.

Note: The value of the High alarm must be more than the

value of the Low Alarm.

Action Delay- Th e ti me i n se conds that the Flow rate value must remain

above the high limit or below the low limit before an alarm
condition is indicated. Valid settings are in the range of 0
to 3600 seconds.

13

Local maintenance push button is available for manual Totalizer reset on the field.
The maintenance push button is located on the right side of the flow meter inside
the maintenance window above the 15 pin D-connector (see Figure c-1 “FMA
4000 configuration jumpers”).

5.3.4 Flow Alarm Settings

FMA 4000 provides the user with a flexible alarm/warning system that monitors
the Gas Flow for conditions that fall outside configurable limits as well as visual
feedback for the user via the status LED and LCD (only for devices with LCD
option) or via a Relay contact closure.

The flow alarm has several attributes which may be configured by the user via a
digital interface. These attributes control the conditions which cause the alarm to
occur and to specify actions to be taken when the flow rate is outside the speci­fied conditions.

Note: In order to locally Reset Totalizer, the reset push button must be
pressed during power up sequence. The following sequence is
recommended:

1. Disconnect FMA 4000 from the power.

2. Press maintenance push button (do not release).

3. Apply power to the FMA 4000 while holding down the maintenance
push button.

4. Release maintenance push button after 6 seconds. For FMA 4000
with optional LCD, when FMA 4000 Main Screen appears
(see Figure b-4).

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