FCI ST50 Operating instructions

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Pre-Installation
The ST50 can be specified with integral or remote electronics. The flow element has a serial number etched into the side of the
extension pipe as shown on Figure A. The transmitter circuit card has a serial number noted on the board as shown in Figure B. The
flow sensor and transmitter circuit have been calibrated as a matched set and should be paired together in service unless otherwise
approved by a factory technician.
Flow Direction Alignment
All sensor elements have a flow arrow indicator marked on the element assembly at the reference flat. These flow elements have
been calibrated in a particular direction and are designed to be used in service with the flow arrow facing in the same direction as
flow in the pipe stream. See Appendix C for orientation and factory calibration details.
ST50 MASS FLOW METER
Installation and Operation Guide
RecommendedStraightRun
To optimize flow meter system performance, FCI recommends installation with a minimum of 20 pipe diameters upstream straight run
and 10 pipe diameters of downstream straight run. Where straight run limitations significantly reduce the available pipe diameters, FCI
utilizes Vortab flow conditioners to produce a transferable flow profile from the calibration installation to actual field installations.
FCI’s proprietaryAVALsoftware is available to make flow meter installation evaluations where straight run limitations are considered.
See Figure C for recommended installation.
FCI flow meters may be installed with less than the recommended straight run, but may have performance limitations. FCI offers
Vortab flow conditioners for use in applications that have significant straight run limitations. FCI uses theAVAL application modeling
software to predict meter performance in each installation.AVALoutputs are available to review prior to order placement and will
indicate performance expectations both with and withoutVortab Flow Conditioning.
Figure C
Figure A Figure B
Flow Direction
Serial Number
FLOW

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ST50 Mass Flow Meter
Specifications
Instrument
Media Compatibility: Air, compressed air, and nitrogen
Pipe/LineSize Compatibility:23" to24" [51 mmto 610 mm]
Range:Air, compressed air, or nitrogen: 0.75 SFPS to 400 SFPS
[0.23MPS to 122MPS]
Accuracy:Standard: ±2% of reading, ±0.5% of full scale
Optional: ±1% of reading, ±0.5% of full scale
Repeatability:±0.5% of reading
TemperatureCompensation:
Standard: 40 °F to 100 °F [4 °C to 38 °C]
Optional:0°F to 250 °F [-18 °C to 121 °C]
TurndownRatio:3:1to 100:1
AgencyApprovals:1
FM/CSA: Nonincendive for use in Class 1, Division 2,
GroupsA, B, C and DT4 Ta = 60 °C Indoor
Hazardous (Classified) Locations.
ATEX/IECEx: II 3 G EEx nA II T6; II 3 D T65°C
(DC input power only)
CPA, CE Mark, PED
Warranty: One year
Flow Element (Standard or FPC Type)
Installation: Insertion, variable length with 1/2" or
3/4" NPT(M) compression fitting.
Type:Thermal dispersion
Material of Construction: 316 stainless steel body with
Hastelloy C thermowell sensors, 316 stainless steel
compression fitting with Teflon or stainless steel ferrule
Pressure (Maximum Operating without Damage):
Stainless steel ferrule: 500 psig [34 bar(g)]
Teflon ferrule: 150 psig [10 bar(g)]
Retractable packing gland: 500 psig [34 bar(g)]
Temperature(MaximumOperation):
Stainless steel ferrule: 0 °F to 250 °F [-18 °C to 121 °C]
Teflonferrule: 0 °F to 200 °F [-18 °C to 93°C]
ProcessConnection: 1/2" MNPT or 3/4" MNPT with
stainless steel or Teflon ferrule; retractable packing gland, 1/2"
or 3/4" MNPT with graphite orTeflon packing.
Insertion Length: Field adjustable lengths: 1" to 6"
[25mm to152 mm]; 1"to 12"[25 mm to305 mm];
or1" to 18" [25 mmto 457 mm]
Flow Transmitter
Enclosure: NEMA 4X [IP67], aluminum, dual conduit ports
with either 1/2" NPT or M20x1.5 entries. Epoxy coated.
Analog Output Signals: Dual 4-20 mA, configurable to flow
rate and/or temperature (500 ohm max impedance) and a pulse
output for total flow.
Output Pulse, Source: Totalized flow or alarm setpoint. 15 VDC.
Pulse width at 50% duty cycle for rates 0 to 500 Hz, 0.5 second
pulse width for pulse rates below 1 Hz. 25 mA maximum load
pulsed, 10 mA maximum load if state set to normally on.
Output Pulse, Sink: Totalized flow or alarm setpoint. Pulse
width at 50% duty cycle for rates 1 to 500 Hz, 0.5 second pulse
width for rates below 1 Hz. Customer power source and load
not to exceed 40 VDC and 150 mA.
CommunicationPort: RS232C, standard.
InputPower:
DC:18VDCto36VDC(6 Wmaximum)
AC:85VAC to 265VAC(12 Wmaximum,1.6Afuse)
(CEMarkApprovalfrom 100VACto 240VAC)
PowerFilterBoard:
Amp
Code Rated Current Voltage Rating
Littelfuse TR5 Series
374 1160 0410 1160 1.60 A 250 V
Breaking Capacity 50A/250 VAC 50-60 Hz cos φ= 1.0
OperatingTemperature:For Indoor or Outdoor use,
0°F to 140 °F [-18 °C to 60°C]
MaximumRelativeHumidity:100%
MaximumAltitude:12,000ft.(3,658m)
DigitalDisplay: ±9999 CountsLCD, 0.45" H[11.4 mm]
characters, user scalable to flow rate units or as 0-100%.
For applications in Div. 1 / Zone 1 environments and/or for
dual-line digital display with built-in totalizer display, refer to
FCIModel ST51.

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ST50 Mass Flow Meter Fluid Components International LLC
InstallingFlowElement
CompressionFitting Mounting
The ST50 is available with both Teflon compression fitting ferrules and metal ferrules. While theTeflon ferrule configuration can be
readjusted, it is possible that over tightening may result in permanent positioning or damage to the extension pipe and will make
future adjustment difficult. While Teflon provides for some adjustability, it has a lower process pressure rating and is not designed for
continuous adjustments. The metal ferrule version can only be tightened down once and it becomes permanently positioned. The
Ferrule type is indicated in the instrument part number displayed on the instrument tag. This can be cross referenced to the ordering
information sheet.
All flow meters have been calibrated with the flow element located at the centerline of the pipe and flow stream as indicated in Figure
D. Couplings and threadolets come in various dimensions. Proper installation requires that the element be measured with consider-
ation to process connection dimensions and pipe centerline. FCI recommends that the element be first installed in the line with the
compression fitting lightly tightened around the extension, then slowly move the pipe extension forward until the element is at
centerline as shown.
Caution:The element is shipped with a protective sleeve surrounding the flow element.After removing the sleeve, take
care to prevent the element from sliding through the compression fitting and contacting the opposing wall with any
force as it may cause damage to the element and potentially upset the calibration.
FLOW ELEMENT INSTALLATION & “U” LENGTH ADJUSTMENT
FigureD
Note: For proper performance install the element so that probe tip is .50 inches [13 mm] past pipe centerline. The instru-
ment is specifically calibrated for centerline referenced installation, which is critical for line sizes 4" [25 mm] and smaller.
Caution:On top mount installations, particularly, take care to prevent the element from sliding through the compression
fitting and contacting the opposing wall with any force as it may cause damage to the element and potentially upset the
calibration.
4.5
[114]
4.00
[102] U LENGTH
VARIABLE
L
C
.50
[13]
Ø.56
[Ø14]
FLUID COMPONENTS
y
SCFM
INTERNATIONAL LLC
3.28
[83]
3.56
[90]
XXXX
C01443-1-1
2X 1/2"
NPT
1/2" OR 3/4" NPT
PROCESS CONNECTION
MOUNTING ORIENTATION OF FLATS
TO BE PARALLEL TO FLOW ADJUSTABLE COMPRESSION FITTING,
OPTIONAL TEFLON OR METAL FERRULE
REDUCER
BUSHING
SERIAL NUMBER
FPC HEAD
SHOWN
FLOW ARROW
ENCLOSURE MEETS EXPLOSION PROOF
WATER AND DUST TIGHT APPROVALS
(SEE MANUAL FOR SPECIFIC
APPROVAL TYPES)

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ST50 Mass Flow Meter
To assist in final installation, FCI suggests making a readable mark on the extension pipe to indicate the final desired compression
fitting position that will place the element at the centerline reference once the system is tightened down into place. With the compres-
sion fitting lightly tightened, hold the element assembly along the outside of the installation, or directly above, to visually verify the
compression fitting location will ensure centerline installation. To calculate the actual “U” length dimension, take the inside diameter
of the pipe or duct divide by 2, then add 0.50", then add for the pipe wall thickness and the process fitting offset that allows the
compression fitting to securely seat in the process port. See Figure D above.
Align the flat parallel to flow and adjust the instrument depth. Upon determination of the final compression fitting location on the
extension pipe, apply the proper thread sealant to the NPT threads, firmly tighten the compression fitting into the mating process
connection. Torque varies per application. Tighten the compression nut to the torque indicated with the corresponding ferrule
material. Manufacturer recommends 1-1/4 turns from hand tight baseline.
Ferrule Torque
Teflon 65 in – lbs
316 SST 65 ft – lbs
RetractablePackingGlandMounting
Aretractable packing gland, with ½" MNPT or ¾" MNPT threads and graphite or Teflon packing, is a process connection option. FCI
single point flow meters are calibrated at the centerline of the process pipe. The flow element is properly mounted when the tip of the
flow element is located .50 inches (13 mm) past the pipe centerline. Follow the below steps to install/retract instruments with the
retractable packing gland option.
1. The scale etched on the side of the insertion probe indicates the length to the tip of the flow element. Calculate the insertion
depth using the equation, variables, and Figure E below.
2. Mark the insertion pipe at the calculated insertion depth.
3. Ball ValveApplications Only: If a ball valve is required, install the ball valve to the process mounting coupling. Close the ball
valve to prevent the process media from leaking out when installing the packing gland with the process line pressurized.
4. Apply the proper thread sealant compatible with the process media to the male threads of the packing gland. Fully retract the
insertion probe into the cavity of the packing gland and install the packing gland into the process mounting coupling or ball
valve. Ifaballvalve is not used, make sure to first depressurize the process line before installing.
ID = Inside Diameter of Pipe
T= Pipe Wall Thickness
C= Mounting Coupling with Optional Ball Valve and Installed Packing Gland Length
INSERTION DEPTH = ______________
FigureE
C01444-1-1
C
L
LOCKING COLLAR
PACKING NUT
MARK
INSERTION
DEPTH
OPTIONAL BALL VALVE:
CUSTOMER-SUPPLIED OR
PURCHASED FROM FCI
FigureE

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ST50 Mass Flow Meter Fluid Components International LLC
5. Tighten the packing nut until the internal packing is tight enough to prevent excess process leakage, but also allow the
insertion probe to be inserted into place. For ball valve applications, open the ball valve after the packing nut has been
tightened.
Caution: For applications where the process media is pressurized to greater than 232 psig [16 bar(g)] make sure to first
depressurize the process line before making the insertion.
6. Align the orientation flat and flow arrow parallel to the flow direction and proceed to insert the flow element into the process
media pipe up to the insertion depth mark.
7. Tighten the packing nut another ½ to 1 turn tight (approximately 20 ft-lbs) until the packing has created a full seal.
8. Ensure the locking collar is properly secured to the back of the packing gland. Torque the two No. 8-32 socket head cap
screws on the locking collar to 20 in-lbs using a 9/64" hex key.
Retraction/Removal Procedure
1. Loosen the socket head cap screw on the side of the locking collar. See Figure F below.
FigureF
PACKING NU
T
LOOSEN THIS SCREW
LOCKING COLLA
R
C01445-1-1
Caution: For applications where the process media is pressurized to greater than 232 psig [16 bar(g)] make sure to first
depressurize the process line before retracting the flow element.At 232 psig [16 bar(g)], the effective force on the insertion
probe is 45.5 lbs (20.6 kg), which is the limit at which the flow element can be safely guided by hand. When using hands
to restrain the retraction, be prepared for a rapid pressure impulse of the flow element. Make sure that there are no objects
directly behind the flow element as the insertion probe may retract very quickly.
2. Slowly loosen the packing nut until the insertion probe begins to retract. Use hands as needed to help control the retrac-
tion. If the probe does not begin to retract itself, gently shake and pull the insertion probe until the flow element has been
fully retracted into the packing gland.
3. For ball valve applications, close the ball valve immediately after retraction to seal off the process.After closing the ball
valve it is then safe to remove the flow element from the back end of the ball valve. Ifaballvalveis not being used, make
sureto first depressurize the process linebeforeremovingtheflow element.

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ST50 Mass Flow Meter
InstrumentWiring
Before the instrument is opened to connect power and signal, FCI recommends that the following ESD precautions be observed:
Use a wrist band or heel strap with a 1 megohm resistor connected to ground. If the instrument is in the shop setting, there should be
a static conductive mat on the work table or floor with a 1 megohm resistor connected to ground. Connect the instrument to ground.
Apply antistatic agents such as Static Free made by Chemtronics (or equivalent) to hand tools to be used on the instrument. Keep
high static producing items away from the instrument.
The above precautions are minimum requirements. The complete use of ESD precautions can be found in the U.S. Dept of Defense
Handbook 263.
Warning:Only qualified personnel are to wire or test this instrument. The operator assumes all responsibility for safe
practices while wiring and troubleshooting.
FCI recommends installing and input power disconnect switch and fuse near the instrument to interrupt power during
installation and maintenance. Operator must have power disconnected before wiring.
Safety instructions for the use of the ST50 series (18 to 36 VDC version only) in HazardousAreas.Approval, KEMA
06ATEX0207 X for Category 3 GD protection EEx nAT6 T65°. Special conditions for safe use:
1) Provision shall be made to prevent the rated voltage from being exceeded by transient disturbances of more than 40%.
2) For applications in explosive atmospheres caused by air/dust mixtures, cables and conduit entries shall be provided a
degree of protection of at least IP65 according to EN60529.
InputPower
The ST50 is available with both VDC andVAC input power configurations. Customers selecting VDC input power will have a VDC
input board only. Similarly, the VAC power board is supplied only with VAC powered units. In addition, both boards are marked for
either DC orAC power. Only connect the power specified on the wiring module as shown in Figures G and H. BothVAC and VDC
inputs require a Gnd wire to be connected. Input power terminal blocks accept 14-26AWG wire.
Make sure power is OFF before wiring the instrument. Pull the power and signal output wires through the port, using care not to
damage wires. FCI recommends using crimp lugs on the output wires to ensure proper connection with the terminal strip. Connect the
output wires as shown in Figures G and H. Note that when the 4-20 mA outputs are used simultaneously, a single return lead is used.

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ST50 Mass Flow Meter Fluid Components International LLC
VACPower
As Shown:
85-265 VAC power connected with Gnd
4-20 mA connected for flow and temperature
Pulse Out in sink mode
Note:In sink mode, 40 VDC max, 150 mA max customer-
supplied power source.
PowerDissipation
ACVersion
Power dissipation values under nominal conditions:
Instrument (electronics + sensor): 11.6 watts
Sensor only: 0.25 watts
Power dissipation values under maximum load conditions:
Instrument (electronics + sensor): 12 watts
Sensor only: 0.30 watts
DCVersion
Power dissipation values under nominal conditions:
Instrument (electronics + sensor): 4.5 watts
Sensor only: 0.25 watts
Power dissipation values under maximum load conditions:
Instrument (electronics + sensor): 6 watts
Sensor only: 0.30 watts
VDCPower
As Shown:
18-36 VDC power connected with Gnd
4-20 mA connected for flow and temperature
Pulse Out in source mode
Note: In source mode, 15 VDC output max, 50 mA max.
FigureH
VACPowerConnection
FigureG
VDCPower Connection
RS232 Connection
RS232 Connection
AnalogOutput
4-20 mA: The instrument is provided with two 4-20 mA outputs. By default Output 1 is configured for flow and Output 2 is configured
for temperature. Terminal blocks accept14-28AWG wire, 500 ohms max load per output.
VDC Input Power IO Board VAC Input Power IO board

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ST50 Mass Flow Meter
Pulse OutputActivation
The ST50 provides an optional pulse output feature. Instruments ordered with this feature and volumetric or mass flow units will be
factory set with totalizer and pulse output activated. The mode can be changed in the field.As required for your application wire the
sink or source output as shown in “Pulse Output Wiring” on the next page.
SourceMode: 15 VDCoutput, 50mA max.
SinkMode: 40VDC max, 150 mA max., customer supplied power source
Modify the analog output configuration using one of the below listed methods:
1. The RS232 port, a PC/terminal program or FC88 hand held terminal and single letter commands as summarized inAppendixA,
Table 5. Use the “V” menu to configure the instrument analog outputs.
2. The RS232 port, a computer and the CLI commands as summarized inAppendixA,Table 6.
PulseOutput Setup
The ST50 mass flow meter pulse output can be configured for either a pulse train (factory standard) for an external counter and/or
flow rate indication or an alarm. The pulse output can be wired to use a source or sink outputs. The maximum frequency of the pulse
output is 500 Hz. Set up the totalizer first, then configure the sink/source pulse output as required for the application (sink/source
output, pulse factor, sample period and pulse state.
Source mode: In this mode the flow meter electronics supplies the voltage and current for the pulse.
Maximum 15 VDC and 50 mA (depends on the connected load).
Sinkmode: If the connectedloadrequires >15VDC and50mA anexternal powersupplyis required.Maximum40VDCand 150mA.
Pulse factor: Number of pulses per selected engineering unit. Default = 1
Example in NCMH:
1 = 1 pulse per NCM
0.1 = 1 pulse per 0.1 NCM (10 pulses per 1 NCM)
10 = 1 pulse per 10 NCM
Range pulse factor 0.001 – 1000
Sampletime: Time in seconds before calculating the next number of pulses.
Pulse state: Transitions High to Low or Low to High. Meaning the pulse is normally high or low.
Pulse output functions:
Alarm: can be set in Source and Sink mode. If this function is selected the state of the transistor driver changes from high
to low or low to high, depending on the selected pulse state, at a set flow rate. (pulse factor and sample time not
required).
Counter: can be set in Source and Sink mode. The transistor driver outputs the calculated number of pulses* based on the
indicated flow.And external display will indicate the totalized flow.
Flow rate: can be set in Source and Sink mode. The transistor driver outputs the calculated number of pulses* based on the
indicated flow. External display set to calculate flow from incoming pulses.
*Each sample period the number of pulses are calculated and output by the open collector. Any remaining fractional pulse in the calculation will be
added to the next sample. Example:
flow = 90 NCMM (= 1.5 NCMS), Pulse factor =1, sample time is 1.
after 1 second the number of calculated pulses is 1.5, pulse out is 1. Remainder = 0.5
after the next second the number of pulses is 2 (1.5+0.5), pulses out is 2. Remainder = 0
+vdc
0vdc
+vdc
0vdc
High to Low
Low to High
C00956-1

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ST50 Mass Flow Meter Fluid Components International LLC
PulseOutput Wiring
Pulse Output Wiring

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ST50 Mass Flow Meter
SetupInterface
All parameters on this meter are set through the RS232 interface connection (modular jack P3). The RS232 interface allows the instru-
ment to be set up with either an FC88 hand held communicator or a computer. The FC88 is powered through the meter and comes with
the serial interface cable. If a computer interface is used, an adapter (RJ to 9-pin PC serial port) is required. The adapter can be obtained
fromFCI:PartNo.014108-02.
Using a serial comm/terminal program (e.g., HyperTerminal,TeraTerm, Putty, etc.) configure the PC’s serial port (the one intended to be
connected to the instrument) as listed below.
COMPortNumber: Number of COM port connected to instrument (COM1, COM2, etc.)
BaudRate: 9600
NumberofBits:8
StopBits:1
Parity: None
FlowControl: None
TerminalEmulation: VT100
After configuring the serial port (and making the PC-to-instrument connections) start a communications session with the applicable
serial port. Enter any of the meter’s single letter commands in the program’s terminal window to execute a function. See “Table 5. ST50
List of Single Letter Commands” on page 25 (Appendix B) for the complete command list.
An additional command line interface (CLI) is available through the RS232 port. This interface is accessed with the “Y” command
using a computer or FC88. The command line password is “357”. SeeTable 6 inAppendix B for command line details.

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ST50 Mass Flow Meter Fluid Components International LLC
StartupandCommissioning
1. Verify that all input power and output signal wiring is correct.
2. Apply power to the instrument. Observe that the instrument initializes in the normal operation mode with all outputs active and
the display (if so equipped) showing flow with the factory-set flow unit.Allow 10 minutes for the instrument to warm up and
come to thermal equilibrium.
The following FC88 commands are typical commands that are used during startup and commissioning:
Enter Display Description
Enter menu: > From Normal Operation Mode
Z E for English M for Metric > Flow Unit Set-Up menu
E0=SFPS, 1=SCFM, 2=SCFH, 3=LB/H,
4=GPM # English units
1 R round duct or S rectangular> Select Standard Ft3/Min (SCFM)
Dia.: 4.0260000
Change? (Y/N)>
YEntervalue:#
area: 7.3926572 CMinflow: 0.0000000
Change? (Y/N)>
Maximum flow: 462.04
Enter to continue
Cmaxflow: 462.04
Change? (Y/N)>
Y#
CMintemp (F): -40.00000
Change? (Y/N)>
CMaxtemp (F): 250.00000
Change? (Y/N)>
Percent of Range is: OFF
Change to ON?>
LCD Mult Factor x1
Change? (Y/N)>
N 100.0 SCFM Instrument will end up in Normal
Operation Mode
R Select Round Duct
3.068 3 inch Sch. 40 pipe I.D.
N
Y
462.04
N
N
N
Command Name Description
T Normal Operation Mode All outputs are active
Z Flow Unit Set-Up Select Flow Units (5 English, 8
Metric), Pipe Dimensions
W Totalizer Enable/Disable
V Output Configuration Select a configuration:
Pulse and/orAlarm, Pulse factor and/or
setpoint, and source/sink polarity
F K-Factor (default=1) Flow factor
N Warm Reset Reinitialize C/B
S Totalizer Menu Enables W menu (Option)
An installed instrument indicates 0.000 with the process flow at zero. The flow engineering units are indicated on the instrument bezel.
Additional units indicators are provided via self-adhesive labels if the instrument’s flow units are changed in the future.
FlowUnitModification
Example: SCFM Flow Units and 3 inch Sch 40 round pipe size set up:

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ST50 Mass Flow Meter
RS232 / FC88
MenuControlandOrganization
All user entries begin at the input mode prompt “>” except when the instrument is in the Main Function Mode. Most entries require at
least two key strokes; a capital letter and the [ENTER] key, or one or more numbers and the [ENTER] key. If the unit is in the Main
Function Mode just press the desired function letter to make an entry.
Backspaces are made using the backspace [BKSP] key. Some entries are case sensitive between numbers and letters. Be sure the
SHIFT key is pressed to indicate the correct case. A square after the prompt caret indicates the FC88 is in lower case. A slightly raised
rectangle in the same spot indicates the FC88 is in the upper case.
It is recommended that the FC88 be plugged into the instrument before power is applied. If the FC88 is plugged in while the instrument
power is on and the FC88 does not respond, press [ENTER]. If there is still no response press [N] or cycle the power.
Note: The Zero and Span may be changed from the original calibration, provided the new values are within the original
calibrated range; i.e., if the original calibration was 1 to 100 SCFM (4-20 mA), the new zero (4 mA) must be equal to or
greater than 1 SCFM, the new span (20 mA) must be equal to or less than 100 SCFM.
Some entries require a Factory pass code. If this occurs contact FCI Field Service to continue programming the instrument. The
instrument will prompt the user when this is necessary. Do not change any parameters that require this code unless there is an absolute
understanding of the instrument's operation. The user cannot exit some routines unless all entries are completed or the power is cycled.
Note:Always press “T” before unplugging the FC88. If a frozen meter display is observed, reconnect the FC88 and wait 5
seconds for the meter to initialize. Disconnect the FC88 and confirm your meter display is varying.
The top level of the menu is shown in Table 5 in Appendix B. Enter the command letter mnemonic as listed in the tables below and in
AppendixB to runa command. Exit acommand at anytime by entering “Q”[ENTER] in themenus D, K, V,W, or Z.
Units
Select E=English M=Metric
Select 0= SFPS 5 = SMPS
or 1 = SCFM 6 = NCMH
or 2 = SCFH 7 = NCMM
or 3 = LBS/H 8 = KG/H
or 4 = GPM 9 = LPM
10 = SCMH
11 = NMPS
12 = SCMM
For Volumetric or Mass Flow
Select R = Round pipe or duct
or S = Square duct
Set Diameter or Wide x High (in inches or mm)
Set CMaxflow = Maximum flow rate (span)
Set CMinflow = Minimum flow rate (zero)
Table 2. Z Menu – Units and Scaling Setup
Note: Changing units requires rescaling the unit (set new zero and span).
Table 3. V Menu – Output Configuration Setup
Table 1. Diagnostics and Factory Settings
C Calibration Information
Display only: A/D, Delta-R, Ref-R data values
D Diagnostics
Displayonly:List of unit parameters.
K Factory Calibration Settings
Display only:Cal. parameters; i.e., linearization
and temperature compensation coefficients.
R Factory Reset
Replaces user data with factory calibration data.

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ST50 Mass Flow Meter Fluid Components International LLC
Use the V menu to set up the 4-20 mA analog outputs (including NAMUR configuration) and source/sink (pulse) outputs.
Note: The display comes up to the last setting saved and stays for 2 seconds. If Nor [ENTER] is entered, the menu
proceeds to the Pulse out. If Yis entered, the display moves to the selection options and/or asks for confirmation. If you
miss the option, select [Enter] repeatedly to loop around
“V”Menu OutputConfigurationSetup
Example: COMMAND V (Reference Table 3)
Case:4-20mA#1=Flow, 4-20mA#2=Temperature, NAMUR=Low, SourceOut=Pulse, Sink=Alarm1
Pressing[V][ENTER]willdisplay “OutputModeSelected” :
The last saved mode of the next menu item displays:
“4-20mA#1=Flow” “4-20mA #2=Temp” ...followed by the prompt:
“Change?(Y/N)”
Press[ENTER](nochange).
The last saved mode of the next menu item displays:
“NAMUR:Off” ...followed by the prompt:
“Change?(Y/N)” SelectY[Enter]. The display reads,
“NAMUR:Off” ...followed by the prompt:
“Enter1tomakethe selection#.” Select[ENTER] Bypassing “1” the next display reads,
“NAMUR:Low” ...followed by the prompt:
“Enter2tomakethe selection#.” Select2and[ENTER] “2” sets the new NAMUR configuration.
The last saved mode of the next menu item displays:
“Source: Pulse” “Sink: Pulse” ...followedbythe prompt:
“Change?(Y/N)” SelectY[Enter]. The display reads,
“Source: Pulse” “Sink: Pulse” ...followedby the prompt:
“Enter1tomakethe selection#.” Select[ENTER]. Bypassing “1” the next display reads,
“Source: Pulse” “Sink: Alarm1” ...followedbythe prompt:
“Enter2tomakethe selection#.” Select2and[ENTER]. “2” sets the new source/sink configuration.
The last saved mode of the next menu item displays:
“PFactor:1.000” ...followed by the prompt:
“Change?(Y/N)>” Respondwith “Y” toenter a factoranywhere from 0.001
to 1000. A pulse factor of 1.000 outputs 1 pulse per unit
offlow.If no change,selectNand/or[ENTER]to
continue.

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ST50 Mass Flow Meter
The last saved mode of the next menu item displays:
“SamplePeriod” ...followedbythe prompt:
“Change?(Y/N)>” Respond with “Y” to enter a sample period value
from 0.5 to 5 seconds.
If no change, select Nand/or [ENTER] to continue.
The last saved mode of the next menu item displays:
“Sourcestate: ”“HightoLow” ...followedby theprompt:
Changeto“LowtoHigh?>” Respond with “Y” to toggle to the alternate setting.
If no change, select Nand/or [ENTER] to continue.
The last saved mode of the next menu item displays:
“Switchpt1” “0.0000000” ... followed by the prompt:
“Change?(Y/N)>” Respond with “Y” to enter a setpoint value (value is
in same units as the flow and must be within the
calibratedrange).
If no change, select Nand/or [ENTER] to continue.
The last saved mode of the next menu item displays:
“Sink state: ”“HightoLow” ...followedbythe prompt:
“Changeto“LowtoHigh?>” Respond with “Y” to toggle to the alternate setting.
Ifno change, select Nand/or[ENTER] to continue to normaloperation (programming finished).

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ST50 Mass Flow Meter Fluid Components International LLC
The FCI instrument requires little maintenance. There are no moving parts or mechanical parts subject to wear in the instrument. The
sensor assembly which is exposed to the process media is composed of 316 SS and Hastelloy C.
Without detailed knowledge of the environmental parameters of the application surroundings and process media, FCI cannot make
specific recommendations for periodic inspection, cleaning, or testing procedures. However, some suggested general guidelines for
maintenance steps are offered below. Use operating experience to establish the frequency of each type of maintenance.
Calibration
Periodically verify the calibration of the output and recalibrate if necessary. FCI recommends every 18 months at a minimum.
Electrical Connections
Periodically inspect cable connections on terminal strips and terminal blocks. Verify that terminal connections are tight and physically
sound with no sign of corrosion.
Remote Enclosure
Verify that the moisture barriers and seals protecting the electronics in the local enclosure is adequate and that no moisture is entering
the enclosure.
Electrical Wiring
FCI recommends occasional inspection of the system’s interconnecting cable, power wiring and flow element wiring on a “common
sense” basis related to the application environment. Periodically the conductors should be inspected for corrosion and the cable
insulation checked for signs of deterioration.
Flow Element Connections
Verify that all seals are performing properly and that there is no leakage of the process media. Check for deterioration of the gaskets and
environmental seals used.
Insertion Type Flow Element Assembly
Periodically remove the flow element for inspection based on historical evidence of debris, foreign matter, or scale build-up and
appropriate plant shutdown schedules and procedures. Check for corrosion, stress cracking, and/or build-up of oxides, salts, or foreign
substances. The thermowells must be free of excessive contaminants and be physically intact. Any debris or residue build-up could
cause inaccurate flow indication. Clean the flow element, as necessary, with a soft brush and available solvents (compatible with
stainless steel).
Maintenance

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ST50 Mass Flow Meter
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Application Verification
After verifying that the flow meter is functioning, review the application parameters as shown below to verify the calibration matches
the process media.
Equipment Needed
Flow Instrument Calibration Data
Process Parameters and Limits
Check Serial Numbers
Verify that the serial number of the flow element and the flow transmitter electronics are the same. The flow element and the flow
transmitter are a matched set and cannot be operated independently of each other.
Check the Instrument Installation
Verify correct mechanical and electrical installation. Verify the flow element is mounted at least 20 diameters downstream and 10
diameters upstream from any bends or interference in the process pipe or duct.
Check for Moisture
Check for moisture on the flow transmitter. Moisture may cause intermittent operation. Check for moisture on the flow element. If a
component of the process media is near its saturation temperature it may condense on the flow element. Place the flow element where
the process media is well above the saturation temperature of any of the process gases.
Check Application Design Requirements
Application design problems may occur with first time application instruments, although the design should also be checked on
instruments that have been in operation for some time. If the application design does not match field conditions, errors occur.
1. Review the application design with plant operation personnel and plant engineers.
2. Ensure that plant equipment such as pressure and temperature instruments conform to the actual conditions.
3. Verify operating temperature, operating pressure, line size, and gas medium.
VerifyStandardVersusActualProcessConditions
The flowmeter measures the mass flow rate. The mass flow rate is the mass of the gas flowing through a pipe per time. Other flow
meters, such as an orifice plate or a pitot tube, measure the volumetric flow rate. The volumetric flow rate is the volume of gas per time.
If the readings displayed do not agree with another instrument, some calculations may be necessary before comparing them. To
calculate the mass flow rate, the volumetric flow rate, and the pressure and temperature, the point of measurement must be known.
Use the following equation to calculate the mass flow rate (Standard Volumetric Flow rate) for the other instrument:
Equation:
QQ
SA
=× ×P
T
T
P
A
A
S
S
(Metric: Where bar(a) and °K are
Where: used for pressure and temperature.)
QA= Volumetric Flow QS= Standard Volumetric Flow
PA= Actual Pressure TA= Actual Temperature
PS= Standard Pressure TS=Standard Temperature
PSIA and °R are used for pressure and temperature units.
Troubleshooting
Example: (Metric: PS= 1.01325 bar(a)
QA= 1212.7 ACFM QS= 1485 SCFM TS =21.1°C (294.1K))
PA= 19.7 PSIA TA= 120°F (580°R)
PS= 14.7 PSIA TS=70°F (530°R)
(1212.7 ACFM 1)(19.7 PSIA
580° R )(530° R_
14.7 PSIA
)=1485 SCFM

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ST50 Mass Flow Meter
Calibration Parameters Verification
The instrument uses a set of predetermined calibration parameters to process flow signals. Most of these parameters should not
change. Included with the instrument is a data package containing the ST50 Delta R Data Sheet. This contains the calibration
parameters stored in the flow transmitter at the factory. To verify that these parameters have not changed, complete the following:
1. Identify the appropriate Delta R data sheets by serial number of the instrument.
2. Press [D] [ENTER]to examine each ofthe parameters. The [ENTER]key allows scrollingonemessage at atime. Use Table 4to
verify parameters with the Delta R data sheet ST50 Parameters.
An issue may exist if parameters withan asterisk (*) have changed. Consult with Customer Service if this is the case. If the parameters
have not changed, continue with the next section.
Table 4. Diagnostic Test Sequence on Display

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ST50 Mass Flow Meter Fluid Components International LLC
Hardware Verification
Equipment Required:
•DigitalMultimeter
•Screwdriver
The ST50 flow meter is made up of these basic components:
•Sensor element
•Customer interface circuit board
•Control circuit assembly circuit board module
•Electronics enclosure
Step 1
Verify fuse (F1) located on the customer interface circuit board is in normal working condition.
Remove power from the instrument. Open the electronics enclosure exposing the customer interface circuit board. This circuit board is
located under the shorter enclosure lid along with all of the power and input/output connections. Unscrew the clear cover on the fuse
and pull the fuse out of the fuse holder. Check the fuse for continuity. If fuse reads open, replace with equivalent component (FCI part
no. 019933-01), Wickmann Inc. series 374, 1.6A(amp code 1160), package 0410 (short radial leads).
Step 2
Verify interconnecting cable from the customer interface board and the control circuit board assembly module are correctly seated into
the appropriate header.
Remove power from the instrument. Open the electronics enclosure exposing the customer interface circuit board. This circuit board is
located under the shorter enclosure lid along with all of the power and input/output connections. Remove the 2 screws securing the
interface circuit board to the electronics enclosure. Carefully lift the interface face board exposing the interconnecting cable between
the interface board and the control circuit assembly. Verify cable is seated firmly at both ends of the cable header.
Fuse (F1)
Cable Header
Interface Board
Control Circuit
Assembly
AC power customer interface board shown.
Fuse (F1) on DC power customer interface
circuit board located in similar position.

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ST50 Mass Flow Meter
Step 3
Verify sensor element continuity and resistance.
Remove sensor element cable from the bottom of the control circuit assembly. Note that two of the wires have a red stripe and are
located closest to the interconnecting cable header. Using an ohmmeter verify that resistance between the two red striped wires is
approximately 1100 ohms +/- 20. This resistance is temperature dependant. The resistance at 70 degrees F should be 1082 ohms.
Verify the resistance between the two natural colored wires are approximately the same.
Sensor Element Cable