Omega FMA 4000 User Manual

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Omega FMA 4000 User Manual

User’sGuide

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FMA 4000

Digital Mass Flow Meters

 

OMEGAnet® Online Service

Internet e-mail

 

 

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info@ omega.com

 

 

 

 

 

 

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For immediate technical or application assistance:

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United Kingdom:

One Omega Drive, River Bend Technology Centre

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Tel: +44 (0)161 777 6611

 

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.

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

1.1

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

1

1.2

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

1

1.3

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

1

2.

INSTALLATION........................................................................................

1

2.1

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

1

2.2

Electrical Connections......................................................................

3

2.2.1

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

3

2.2.2

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

3

2.2.3

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

4

3.

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

6

4.

SPECIFICATIONS...................................................................................

7

5.

OPERATING INSTRUCTIONS..................................................................

9

5.1

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

9

5.2

Swamping Condition.......................................................................

10

5.3

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

11

5.3.1

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

11

5.3.2

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

12

5.3.3

Totalizer Settings.............................................................................

12

5.3.4

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

13

5.3.5

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

14

5.3.6

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

14

5.3.7

Zero Calibration...............................................................................

15

5.3.8

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

17

5.4

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

17

6.

MAINTENANCE.........................................................................................

18

6.1

Introduction......................................................................................

18

6.2

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

19

6.2.1

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

19

6.2.2

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

19

7.

CALIBRATION PROCEDURES.................................................................

20

7.1

Flow Calibration...............................................................................

20

7.2

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

21

7.2.1

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

21

7.2.2

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

21

7.2.3

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

21

7.3

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

23

7.3.1

Initial Setup.......................................................................................

24

7.3.2

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

25

7.3.3

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

25

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

26

 

8.1

General............................................................................................

26

 

8.2

Commands Structure.........................................................................

26

 

8.3

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

28

9.

TROUBLESHOOTING................................................................................

34

 

9.1

Common Conditions........................................................................

34

 

9.2

Troubleshooting Guide.....................................................................

35

 

9.3

Technical Assistance.......................................................................

37

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

37

APPENDIX I

OMEGA FMA 4000 EEPROM Variables..............................

38

APPENDIX II

INTERNAL USER SELECTABLE GAS FACTOR TABLE

 

 

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

41

APPENDIX III

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

42

APPENDIX IV

COMPONENT DIAGRAM......................................................

46

APPENDIX V

DIMENSIONAL DRAWINGS.................................................

48

APPENDIX VI

WARRANTY...........................................................................

50

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.UNPACKING THE FMA 4000 MASS FLOW METER

1.1Inspect 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.

1.2Unpack 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.

1.3Returning 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

2.1Primary 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.

1

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 ±15F from 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.)

2

2.2Electrical Connections

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

Figure b-1.

2.2.1Power 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.

3

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(-) RS485 T(+) or R(+) RS485 GND (if available)

...................... pin 8 of the 15 pin “D” connector (TX-)

...................... pin 15 of the 15 pin “D” connector (RX+)

...................... 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) RS232 TX (pin 3 on the DB9 connector) RS232 GND (pin 5 on the DB9 connector)

..... pin 8 of the 15 pin “D” connector (TX)

..... pin 15 of the 15 pin “D” connector (RX)

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

4

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

PIN

FMA 4000 FUNCTION

1Common, Signal Ground For Pin 2 (4-20 mA return).

20-5 Vdc or 4-20mA Flow Signal Output.

3Relay No. 2 - Normally Open Contact.

4Relay No. 2 - Common Contact.

5Common, Power Supply

(- DC power for 11 to 26 Vdc).

6Relay No. 1 - Common Contact.

7Plus Power Supply

(+ DC power for 11 to 26 Vdc).

8RS485 (-) (Optional RS232 TX).

9RS232 Signal GND (RS485 GND Optional).

10Do not connect (Test/Maintenance terminal).

11Relay No. 2 - Normally Closed Contact.

12Relay No. 1 - Normally Open Contact.

13Relay No. 1 - Normally Closed Contact.

14Do not connect (Test/Maintenance terminal).

15RS485 (+) (Optional RS232 RX).

Shield Chassis Ground.

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.

5

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 hardware 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.

6

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 70FF (21.1FC)] 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/ FC 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: 41FF to 122 FF (5 FC to 50 FC).

RELATIVE GAS HUMIDITY: Up to 70%.

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

ATTITUDE SENSITIVITY: Incremental deviation of up to 1% from stated accuracy, after rezeroing.

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.

7

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.

FLOW RANGES

TABLE I FMA 4000 LOW FLOW MASS FLOW METER*

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

 

 

*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

MAXIMUM PRESSURE DROP

 

[std liters/min]

[mm H2O]

 

[psid]

 

[kPa]

 

 

 

 

FMA 4000

 

up to 10

130

 

0.18

 

1.275

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MODEL

 

 

WEIGHT

 

 

SHIPPING WEIGHT

FMA 4000 transmitter

 

2.20 lbs. (1.00 kg)

 

 

3.70 lbs. (1.68 kg)

8

5.OPERATING INSTRUCTIONS

5.1Preparation 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).

OMEGA FMA 4000 485

S: Ver1.4

Rev.A0

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).

Ad: 11 Out: 0-5Vdc

Gas# 1

AIR

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).

F:50.0 L/min

T:75660.5 Ltr

Figure b-4: FMA 4000 Main Screen

9

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

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.

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

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.

F:50.0 L/min

**WarmUp 2:39 **

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

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).

5.2Swamping 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.

10

5.3 FMA 4000 Parameters Settings

5.3.1Engineering 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

TOTALIZER

DESCRIPTION

ENGINEERING

ENGINEERING

 

 

UNITS

UNITS

 

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

8

7

m3/sec

m3

Cubic meter per second

9

8

m3/ min

m3

Cubic meter per minute

10

9

m3/hr

m3

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

 

 

 

 

 

11

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

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.

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.

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.

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.

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

12

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”).

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).

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.

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 AlarmThe 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 DelayThe time in seconds 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.

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