Omega FMA 4000 User manual

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User’s Guide
FMA 4000
Digital Mass Flow Meters
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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 car-
ton, 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 ship-
ping damage. In addition to contacting the shipping carrier please forward a copy
of any damage report to Omega7directly.
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 OMEGA7customer service representative and request a
Return Authorization Number (AR).
It is mandatory that any equipment returned for servicing be purged and neutral-
ized of any dangerous contents including but not limited to toxic, bacterially infec-
tious, 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 con-
taminated 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 Omega 7 .
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 accura-
cy. 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 fer-
rules and fittings for dust or other contaminant’s.
When connecting the gas system to be monitored, be sure to observe the direc-
tion 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 tub-
ing 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 instruc-
tions. 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 calibrat-
ed 4-20 mA output signals (jumper selectable). This linear output signal repre-
sents 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, total-
izer and alarm settings, gas table, conversion factors and engineering units selec-
tion, 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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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).
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, how-
ever, 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 con-
dition 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 spec-
ified 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 con-
duit 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 sec-
tions 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 (ARM7TDMI7MCU) 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 adjust-
ment (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 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 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, NEOPRENE7or KALREZ7O-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 thor-
oughly 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 EEP-
ROM 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 set-
tings, 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 eventu-
ally 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.

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
87m3/sec m3Cubic meter per second
98
m3/ min m3Cubic meter per minute
10 9 m3/hr m3Cubic meter per hour
11 10 f3/sec f 3Cubic feet per second
12 11 f3/min f 3Cubic feet per minute
13 12 f3/hr f 3Cubic 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 integrat-
ing 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.

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- The 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.
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 speci-
fied 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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The current Flow Alarm settings and status are available via digital interface (see
paragraph 8.3 ASCII Command Set “FMA 4000 SOFTWARE INTERFACE COM-
MANDS”).
5.3.5 Relay Assignment Settings
Two sets of dry contact relay outputs are provided to actuate user supplied equip-
ment. These are programmable via 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).
The user can configure each Relay action from 6 different options:
No Action : (N) No assignment (relay is not assigned to any events and not energized).
Totalizer > Limit : (T) Totalizer reached preset limit volume.
High Flow Alarm : (H) High Flow Alarm condition.
Low Flow Alarm : (L) Low Flow Alarm condition.
Range between H&L : (R) Range between High and Low Flow Alarm condition.
Manual Enabled : (M) Activated regardless of the Alarm and Totalizer conditions.
5.3.6 K Factors Settings
Conversion factors relative to Nitrogen for up to 36 gases are stored in the FMA
4000 (see APPENDIX II). In addition, provision is made for a user-defined con-
version factor. Conversion factors may be applied to any of the ten gas calibra-
tions via digital interface commands.
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Latch Mode- Controls Latch feature when Relays are assigned to
Alarm event. Following settings are available:
0 - Latch feature is disabled for both relays
1 - Latch feature is enabled for Relay#1 and disabled for Relay#2
2 - Latch feature is enabled for Relay#2 and disabled for Relay#1
3 - Latch feature is enabled for both relays.
Note: If the alarm condition is detected, and the Relay is assigned to
Alarm event, the corresponding Relay will be energized.
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Note: By default, flow alarm is non-latching. That means the alarm is
indicated only while the monitored value exceeds the specified
conditions. If Relay is assigned to the Alarm event, in some cases, the
Alarm Latch feature may be desirable.
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The available K Factor settings are:
• Disabled (K = 1).
• Internal Index The index [0-35] from internal K factor table
(see APPENDIX II).
• User Defined User defined conversion factor.
5.3.7 Zero Calibration
The FMA 4000 includes an auto zero function that, when activated, automatical-
ly adjusts the mass flow sensor to read zero. The initial zero adjustment for your
FMA 4000 was performed at the factory. It is not required to perform zero calibra-
tion unless the device has zero reading offset with no flow conditions.
Shut off the flow of gas into the Digital Mass Flow Meter. To ensure that no seep-
age or leak occurs into the meter, it is good practice to temporarily disconnect the
gas source. The Auto Zero may be initiated via digital communication interface or
locally by pressing the maintenance push button, which 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”).
To start Auto Zero locally, press the maintenance push button. The status LED will
flash not periodically with the RED light. On the FMA 4000 with optional LCD, the
following screen will appear:
Note: The conversion factors will not be applied for % F.S.
engineering unit.
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Note: Before performing Zero Calibration, make sure the device is
powered up for at least 15 minutes and absolutely no flow condition is
established.
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Note: The same maintenance push button is used for Auto Zero
initiation and Totalizer reset. The internal diagnostic algorithm will
prevent initiating Auto Zero function via the maintenance push button
before the 6 minutes sensor warm up period has elapsed.
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Figure b-6: FMA 4000 Screen in the beginning of Auto Zero procedure.
The Auto Zero procedure normally takes 1 - 2 minutes during which time the DP
Zero counts and the Sensor reading changes approximately every 3 to 6 seconds.
Figure b-7: FMA 4000 during the Auto Zero procedure.
The nominal value for a fully balanced sensor is 120 Counts. If the FMA 4000’s
digital signal processor was able to adjust the Sensor reading within 120 ± 10
counts, then Auto Zero is considered successful. The status LED will return to a
constant GREEN light and the screen below will appear:
Figure b-7: FMA 4000 during the Auto Zero procedure.
If the device was unable to adjust the Sensor reading to within 120 ± 10 counts,
then Auto Zero is considered as unsuccessful. The constant RED light will appear
on the status LED. The user will be prompted with the “AutoZero ERROR!” screen.
AUTOZERO IS ON!
AUTOZERO IS ON!
S: 405 DP: 512
AutoZero is Done
S: 122 DP: 544
Note: The actual value of the Sensor and DP counts will vary for each
FMA 4000.
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Note: For FMA 4000 with RS232 option all Auto Zero status info
available via digital communication interface.
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