Omega ST50 User guide

ST50 MASS FLOW METER

Installation and Operation Guide

Pre-Installation

The ST50 can be specied with integral or remote electronics. The ow element has a serial number etched into the side of the
extension pipe as shown in Figure A. The transmitter circuit card has a serial number noted on the board as shown in Figure B. The
ow 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 ow arrow indicator marked on the element assembly at the reference at. These ow elements have
been calibrated in a particular direction and are designed to be used in service with the ow arrow facing in the same direction as
ow in the pipe stream. See Appendix C for orientation and factory calibration details.

Recommended Straight Run

To optimize ow 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 signicantly reduce the available
pipe diameters, FCI uses Vortab ow conditioners to produce a transferable ow prole from the calibration installation to actual
eld installations. FCI’s proprietary AVAL software is available to make ow meter installation evaluations where straight run
limitations are considered. See Figure C for recommended installation.

Figure C

FCI ow meters may be installed with less than the recommended straight run, but may have performance limitations. FCI offers
Vortab ow conditioners for use in applications that have signicant straight run limitations. FCI uses the AVAL application
modeling software to predict meter performance in each installation. AVAL outputs are available to review prior to order
placement and will indicate performance expectations both with and without Vortab ow conditioning.

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Specications

Instrument

Media Compatibility:

Pipe/Line Size Compatibility:

Range:

Air, compressed air, or nitrogen: 0.75 SFPS to 400 SFPS

[0.23 MPS to 122 MPS]

Accuracy: Standard: ±2% of reading, ±0.5% of full scale
Optional: 0 °F to 250 °F [-18 °C to 121 °C]

Repeatability:

±0.5% reading

Temperature Compensation:

Standard: 40 °F to 100 °F [4 °C to 38 °C]
Optional: 0 °F to 250 °F [-18 °C to 121 °C]

Turndown Ratio:

Agency Approvals:

FM (US):

Class I, Div 1, GPS B,C,D
Class I, Div 2, GPS A,B,C,D
Class II/III, Div 1, GPS E,F,G
T4: -40°C<Ta<60°C
Type 4X, IP66

CSA (Canada):

Class I, Div 2, GPS A,B,C,D
T4: -40°C<Ta<60°C
Type 4X, IP66

ATEX/IECEx:

II 3 G EEx nA II T6
II 3 D T65°C
(DC input power only)

Warranty:

One year

Air, compressed air, and nitrogen

23 to 24 [51 mm to 610 mm]

″ ″

3:1 to 100:1

Flow Element (Standard or FPC Type)

Installation: Insertion, variable length with 1/2″ or 3/4″ NPT(M)

compression tting.

Type:

Thermal Dispersion

Material of Construction:

Hastelloy C thermowell sensors, 316 stainless steel compression
tting with Teon or stainless steel ferrule.

Pressure (Maximum Operating without Damage):

Stainless steel ferrule: 500 psig [34 bar(g)]

Teon ferrule: 150 psig [10 bar(g)]

Retractable packing gland: 500 psig [34 bar(g)]

Temperature (Maximum Operation):

Stainless steel ferrule: 0 °F to 250 °F [-18 °C to 121 °C]

Teon ferrule: 0 °F to 200 °F [-18 °C to 93 °C]

316 stainless steel body with

Process Connection:

1/2″ MNPT or 3/4″ MNPT with stainless steel or Teon ferrule

Retractable packing gland,

1/2″ or 3/4″

MNPT with graphite

or Teon packing

Insertion Length (Field Adjustable):

1″ to 6″ [25 mm to 152 mm]
1″ to 12″ [25 mm to 305 mm]
1″ to 18″ [25 mm to 457 mm]

Flow Transmitter

Enclosure:

with either 1/2″ Female NPT or M20x1.5 entries. Epoxy coated.

Analog Output Signals:

rate and/or temperature (500 ohms max impedance) and a pulse
output for total ow.

Output Pulse Source:

Pulse width at 50% duty cycle for rates 1 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:

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.

Communication Port: RS-232C, standard

Input Power:

DC: 18 VDC to 36 VDC (6 watts max.)
AC:

Power Filter Board:

Littelfuse TR5 Series

Breaking Capacity 50A @ 250 VAC

Operating Temperature:

0 °F to 140 °F [-18 °C to 60 °C]

Maximum Relative Humidity:

Maximum Altitude:

Digital Display:

user scalable to ow 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 FCI Model ST51.

NEMA 4X [IP67], aluminum, dual conduit ports

Dual 4-20 mA, congurable to ow

Totalized ow or alarm setpoint. 15 VDC.

Totalized ow or alarm set point. Pulse

85 VAC to 265 VAC (12 watts max.; 1.6 A fuse)

CE Mark Approval from 100 VAC to 240 VAC)

Amp Code Rated Current Voltage Rating

374 1160 0410

1160 1.60 A 250 V

For Indoor or Outdoor use,

100%

12,000 ft. [3,658 m]

±9999 Counts LCD, 0.45″ H [11.4 mm] characters,

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Installing Flow Element

Compression Fitting Mounting

Caution: The element is shipped with a protective sleeve surrounding the ow element. After removing the sleeve, take
care to prevent the element from sliding through the compression tting and contacting the opposing wall with any force
as it may cause damage to the element and potentially upset the calibration.

The ST50 is available with both Teon compression tting ferrules and metal ferrules. While the Teon ferrule conguration
can be readjusted, it is possible for over-tightening to cause permanent positioning or damage to the extension pipe that makes
future adjustment difcult. While Teon 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 ow meters have been calibrated with the ow element located at the centerline of the pipe and ow stream as indicated in
Figure D. Couplings and threadolets come in various dimensions. Proper installation requires that the element be measured with
consideration to process connection dimensions and pipe centerline. FCI recommends that the element be rst installed in the line
with the compression tting lightly tightened around the extension, then slowly move the pipe extension forward until the element
is at centerline as shown.

Caution: On top mount installations, particularly, take care to prevent the element from sliding through the compression
tting 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

Figure D

Note: For proper performance install the element so that probe tip is .50 inches [13 mm] past pipe centerline. Instrument
is specically calibrated for centerline referenced installation, which is critical for line sizes 4″ [25 mm] and smaller.

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To assist in nal installation, FCI suggests making a readable mark on the extension pipe to indicate the nal desired compression
tting position that will place the element at the centerline reference once the system is tightened down into place. With the
compression tting lightly tightened, hold the element assembly along the outside of the installation, or directly above, to visually
check the compression tting’s centerline installation. To calculate the actual “U” length dimension, take the inside diameter
of the pipe or duct divide by 2, then add 0.25″, then add for the pipe wall thickness and the process tting offset that allows the
compression tting to securely seat in the process port. See Figure D above.

Align the at parallel to ow and adjust the instrument depth. Upon determination of the nal compression tting location on
the extension pipe, apply the proper thread sealant to the NPT threads and rmly tighten the compression tting 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

Teon 65 in-lbs

316 SST 65 ft-lbs

Retractable Packing Gland Mounting

A retractable packing gland, with ½″ MNPT or ¾″ MNPT threads and graphite or Teon packing, is a process connection option.
FCI single point ow meters are calibrated at the centerline of the process pipe. The ow element is properly mounted when the
tip of the ow 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 ow element. Calculate the insertion
depth using the equation, variables, and Figure E below.

ID = Inside Diameter of Pipe
T = Pipe Wall Thickness
C = Mounting Coupling with Optional Ball Valve and Installed Packing Gland Length

INSERTION DEPTH = ______________

Figure E

2. Mark the insertion pipe at the calculated insertion depth.

3. Ball Valve Applications 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. If a ball valve is not used, make sure to rst depressurize the process line before installing.

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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 rst
depressurize the process line before making the insertion.

6. Align the orientation at and ow arrow parallel to the ow direction and proceed to insert the ow 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.

Figure F

Caution: For applications where the process media is pressurized to greater than 232 psig [16 bar(g)] make sure to
rst depressurize the process line before retracting the ow 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 ow element can be safely guided by hand. When
using hands to restrain the retraction, be prepared for a rapid pressure impulse of the ow element. Make sure that there
are no objects directly behind the ow 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 retraction.
If the probe does not begin to retract itself, gently shake and pull the insertion probe until the ow 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 ow element from the back end of the ball valve. If a ball valve is not being used, make
sure to rst depressurize the process line before removing the ow element.

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Instrument Wiring

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 oor 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.

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 on Figures G and H.

Warning: Only qualied personnel are to wire or test this instrument. The operator assumes all responsibility for safe
practices while wiring and troubleshooting.

Install an 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 only) in Hazardous Areas. Approval, KEMA
06ATEX0207 X for Category 3 GD protection EEx nA T6 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.

Input Power

The ST50 is available with both

VDC and VAC input power congurations. 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 or AC power. Only connect the power specied on the wiring module as shown in Figures G and H
respectively. Both DC and AC inputs require a Gnd wire to be connected. Input power terminal blocks accept 14-26 AWG wire.

Analog Output

4-20 mA: The instrument is provided with two 4-20 mA outputs. By default Output 1 is congured for ow and Output 2 is

congured for temperature. Terminal blocks accept 14-28 AWG wires, 500 ohms max. load per output. Note that when the 4-20
mA outputs are used simultaneously, a single return lead is used.

Modify the analog output conguration using one of the below listed methods:

1. The RS232 port, a PC terminal program or FS88 handheld terminal and single-letter commands as summarized in Appendix

B, Table 5. Use the ‘V’ menu to congure the instrument analog outputs.

2. The RS232 port, a computer and the CLI commands as summarized in Appendix B, Table 6.

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VDC Power Connection

VAC Power Connection

Figure G

VDC Power

As Shown:

18-36 VDC power connected with gnd
4-20 mA connected for ow and temperature
Pulse Out in source mode

Note: In source mode, 15 VDC Output max, 50 mA max.

Power Dissipation

DC Version

Power dissipation values under nominal conditions:

Instrument (Electronics + Sensor): 4.5 watts

Sensor only: 0.25 watts

Power dissipation values under max. load conditions:

Instrument (Electronics + Sensor): 6 watts

Sensor only: 0.30 watts

Figure H

VAC Power

As Shown:

85-265 VAC power connected with gnd
4-20 mA connected for ow and temperature
Pulse Out in sink mode

Note: In sink mode, 40 VDC max, 150 mA max customer
supplied power source.

AC Version

Power dissipation values under nominal conditions:

Instrument (Electronics + Sensor): 11.6 watts
Sensor only: 0.25 watts

Power dissipation values under max. load conditions:

Instrument (Electronics + Sensor): 12 watts
Sensor only: 0.30 watts

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Pulse Output Activation

The ST50 provides an optional pulse output feature. Instruments ordered with this feature and volumetric or mass ow units will be
factory set with totalizer and pulse output activated. The mode can be changed in the eld. See the examples of source and sink output
wiring in Figures G and H above. Though only one conguration is shown with the VAC and VDC power supplies, the source or sink
can be used with either power input.

Source Mode: 15 VDC output, 50 mA max.

Sink Mode: 40 VDC max, 150 mA max. Customer-supplied power source.

Pulse Output Setup

The ST50 mass ow meter pulse output can be congured for either a pulse train (factory standard) for an external counter and/
or ow 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 rst, then congure 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 ow meter electronics supplies the voltage and current for the pulse. Maximum 15 VDC and

50 mA (depends on the connected load).

Sink mode: If the connected load requires >15 VDC and 50 mA an external power supply is required. Maximum 40 VDC

and 150 mA.

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

Sample time: 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: Set in Source or Sink mode. With this function selected, the transistor driver state changes from high to low or

low to high, depending on the selected pulse state, at a set ow rate (pulse factor and sample time not required).

Counter: Set in Source or Sink mode. The transistor driver outputs the calculated number of pulses* based on the

indicated ow. And external display will indicate the totalized ow.

Flow rate: Set in Source or Sink mode. The transistor driver outputs the calculated number of pulses* based on the

indicated ow. External display set to calculate ow 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

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Setup Interface

All parameters on this meter are set through the RS232 interface connection (modular jack P3). The RS232 interface allows the
instrument 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 from FCI: Part No. 014108-02.

Using a serial comm/terminal program (e.g., HyperTerminal, TeraTerm, Putty, etc.) congure the PC’s serial port (the one intended to
be connected to the instrument) as listed below.

COM Port Number: Number of COM port connected to instrument (COM1, COM2, etc.)

Baud Rate: 9600

Number of Bits: 8

Stop Bits: 1

Parity: None

Flow Control: None

Terminal Emulation: VT100

After conguring 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 21 (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.” See "Table 6. ST50 List of CLI Commands" on page 21 in
Appendix B for command line details.

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Startup and Commissioning

1. Verify all input power and output signal wiring is correct and ready for initial power startup.

2. Apply power to instrument. The instrument initializes in the Normal Operation Mode with all outputs active. An instrument

with the display option will show ow with the factory-set ow units. Allow 30 minutes for the instrument to warm up and
reach thermal equilibrium.

Note: Thirty (30) minute warm-up required before calibration check.

The following FC88 commands are typical commands that are used during startup and commissioning:

Command Name Description

T Normal Operation Mode All outputs are active

Z Flow Unit Setup Select Flow Units (5 English, 8 Metric), Pipe

Dimensions

W Totalizer Enable/Disable

V Output Conguration Select a conguration:

Pulse and/or Alarm, 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 ow at zero. The ow engineering units are indicated on the instrument bezel.
Additional units indicators are provided via self-adhesive labels if the instrument’s ow units are changed in the future.

Flow Unit Modification

Example: SCFM Flow Units and 3-inch Sch 40 round pipe size setup:

Enter Display Description

Enter menu: > From Normal Operation Mode

Z E for English M for Metric> Flow Unit Set-up menu

E 0=SFPS, 1=SCFM, 2 =SCFH,

3=LB/H, 4=GPM #

1 R round duct or S rectangular> Select standard cubic ft./minute (SCFM)

R Dia.: 4.0260000

Change? (Y/N)>

Y Enter value: #

3.068 area: 7.3926572 CMinow:

0.0000000
Change? (Y/N)>

N Maximum ow: 462.04

Enter to continue

Y Cmaxow: 462.04

Change? (Y/N)>

Y #

462.04 CMintemp (F): -40.00000
Change? (Y/N)>

N

N

N

N

CMaxtemp (F): 250.00000
Change? (Y/N)>

Percent of Range is: OFF
Change to ON?>

LCD Mult Factor x1
Change? (Y/N)>

100.0 SCFM

English units

Select Round Duct

3-inch Sch. 40 pipe I.D.

Instrument back in Normal Operation Mode

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RS232 / FC88

Menu Control and Organization

Most entries require at least two key strokes; a capital letter and the [ENTER] key, or one or more numbers and the [ENTER] key.
All user entries begin at the input mode prompt “>”, except when the instrument is in the Main Function Mode (just press the
desired function letter and [ENTER] 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, and 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 conrm your meter display is varying.

The top level of the menu is shown in "Table 5. ST50 List of Single Letter Commands" on page 21. Enter the command letter
mnemonic as listed in the tables below and in Appendix B to run a command. Exit a command at any time by entering “Q”
[ENTER] in the menus D, K, V, W, or Z.

able 1. Diagnostics and Factory Settings

T

C Calibration Information

Display only: A/D, Delta-R, Ref-R data values.

D Diagnostics

Display only: List of unit parameters.

K Factory Calibration Settings

Display only: Cal. parameters; i.e., linearization and
temperature compensation coefcients.

R Factory Reset

Replaces user data with factory calibration data

Table 3. V Menu – Output Conguration Setup

Table 2. “Z” Flow Units Set-Up and Scaling

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 CMaxow = Maximum ow rate (span)
Set CMinow = Minimum ow rate (zero)

Note: Changing units requires rescaling the unit (set new zero and span).

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“V” Menu Output Conguration Setup

Use the V menu to set up the 4-20 mA analog outputs (including NAMUR conguration) and source/sink (pulse) outputs.

Note: The display comes up to the last setting saved and stays for 2 seconds. If N or [ENTER] is entered, the menu
proceeds to the Pulse out. If Y is entered, the display moves to the selection options and/or asks for conrmation. If you
miss the option, select [Enter] repeatedly to loop around.

Example: COMMAND V (Reference Table 3)

Case: 4-20 mA #1 = Flow, 4-20 mA #2 = Temperature, NAMUR = Low, Source Out = Pulse, Sink = Alarm1

Pressing [V] [ENTER] will display “Output Mode Selected” :

The last saved mode of the next menu item displays:

“4-20 mA #1 = Flow” “4-20 mA #2 = Temp” ...followed by the prompt:

“Change? (Y/N)”

Press [ENTER] (no change).

The last saved mode of the next menu item displays:

“NAMUR: Off” ...followed by the prompt:

“Change? (Y/N)” Select Y [Enter]. The display reads,

“NAMUR: Off” ...followed by the prompt:

“Enter 1 to make the selection #.” Select [ENTER] Bypassing “1” the next display reads,

“NAMUR: Low” ...followed by the prompt:

“Enter 2 to make the selection #.” Select 2 and [ENTER] “2” sets the new NAMUR conguration.

The last saved mode of the next menu item displays:

“Source: Pulse” “Sink: Pulse” ...followed by the prompt:

“Change? (Y/N)” Select Y [Enter]. The display reads,

“Source: Pulse” “Sink: Pulse” ...followed by the prompt:

“Enter 1 to make the selection #.” Select [ENTER]. Bypassing “1” the next display reads,

“Source: Pulse” “Sink: Alarm1” ...followed by the prompt:

“Enter 2 to make the selection #.” Select 2 [ENTER]. “2” sets the new source/sink conguration.and

The last saved mode of the next menu item displays:

“PFactor: 1.000” ...followed by the prompt:

“Change? (Y/N)>” Respond with “Y” to enter a factor anywhere from

0.001 to 1000. A pulse factor of 1.000 outputs 1
pulse per unit of ow. If no change, select N and/or
[ENTER] to continue.

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ST50 Mass Flow Meter Fluid Components International LLC

The last saved mode of the next menu item displays:

“Sample Period” ...followed by the prompt:

“Change? (Y/N)>” Respond with “Y” to enter a sample period value

from 0.5 to 5 seconds.

If no change, select N and/or [ENTER] to continue.

The last saved mode of the next menu item displays:

“Source state: ” “High to Low” ...followed by the prompt:

Change to “Low to High?>” Respond with “Y” to toggle to the alternate setting.

If no change, select N and/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 ow and must be within the
calibrated range).

If no change, select N and/or [ENTER] to continue.

The last saved mode of the next menu item displays:

“Sink state: ”

“High to Low” ...followed by the prompt:

“Change to “Low to High?>” Respond with “Y” to toggle to the alternate setting.

If no change, select N and/or [ENTER] to continue to normal operation (programming nished).

Maintenance

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
specic 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.

Note: Thirty (30) minute warm-up required before calibration check.

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 ow element wiring on a
“common sense” basis related to the application environment. Periodically inspect the conductors for corrosion and check the
cable insulation 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 ow 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 ow indication. Clean the ow element, as necessary, with a soft brush and available solvents
(compatible with stainless steel).

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Troubleshooting

Application Verification

After verifying that the ow 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 ow element and the ow transmitter electronics are the same. The ow element and the ow
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 ow 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 ow transmitter. Moisture may cause intermittent operation. Check for moisture on the ow element. If
a component of the process media is near its saturation temperature it may condense on the ow element. Place the ow 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 rst 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 eld 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.

Verify Standard Versus Actual Process Conditions

The ow meter measures the mass ow rate. The mass ow rate is the mass of the gas owing through a pipe per time. Other ow
meters, such as an orice plate or a pitot tube, measure the volumetric ow rate. The volumetric ow 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 ow rate, the volumetric ow rate, and the pressure and temperature, the point of measurement must be
known. Use the following equation to calculate the mass ow rate (Standard Volumetric Flow rate) for the other instrument:

Equation:

Q Q

Where:
Q
P
P
PSIA and °R are used for pressure and temperature units.

Example: (Metric: PS = 1.01325 bar(a)

P
P

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= × ×

S A

A

A

P

T

= Volumetric Flow QS = Standard Volumetric Flow

A

= Actual Pressure T = Actual Temperature
= Standard Pressure TS = Standard Temperature

S

= 1212.7 ACFM QS = 1485 SCFM

A

= 9.7 PSIA TA = 120 °F (580 °R)
= 14.7 PSIA TS = 70 °F (530 °R)

S

T

A

A

S

P

S

1212.7 ACFM

(

(Metric: Where bar(a) and °K are
used for pressure and temperature.)

A

TS = 21.1°C (294.1K)) Q

19.7 PSIA

1

)

580 °R

(

)

(

530 °R

14.7 PSIA

= 1485 SCFM

)

ST50 Mass Flow Meter Fluid Components International LLC

Calibration Parameters Verification

The instrument uses a set of predetermined calibration parameters to process ow signals. Most of these parameters should not
change. A data package included with the instrument (typically on a CD-ROM) contains the ST50 Delta R Data Sheet. The data
sheet contains the calibration parameters stored in the ow transmitter at the factory. To verify that these parameters have not
changed, complete the following:

1. Identify the appropriate Delta R data sheets by instrument serial number.

2. Press [D] [ENTER] to examine each of the parameters. The [ENTER] key allows scrolling one message at a time. Use Table
4 below to record actual instrument parameters. Compare with the Delta R data sheet’s ST50 parameters.

Table 4. Diagnostic Test Sequence on Display

S/W Version: dR Min: T SpanIDAC 0:

Flow Factor: dR Max: T ZeroIDAC 0:

Cmin Flow: Cal Ref: T SpanIDAC 1:

Cmax Flow: Tcslp: T ZeroIDAC 1:

Eng Units: Tcslp 0: State 0:

Line Size 0: Tcslp 2: Switch Pt 0:

Line Size 1: Tot Menu: State 1:

Cmin Temp: Tot Flag: Switch Pt 1:

Cmax Temp: Totalizer: K factor 1:

Min Flow: Rollover Cnt: K factor 2:

Max Flow: Fix Pt Flag: K factor 3:

Density: Pulse Factor: K factor 4:

*C1 [1]: Pulse Out: I factor:

*C1 [2]: Hours: Temp Flag:

*C1 [3]: Sample Period: Out Mode:

*C1 [4]: dR Slope: Namurmode:

*C1 [5]: dR Off Set: Boxcar Max:

Break Pt: Refr Slope: RTD-SLP-385:

*C2 [1]: Refr Off Set: % of Range:

*C2 [2]: SpanIDAC 0: User Name:

*C2 [3]: ZeroIDAC 0: Shop Order #:

*C2 [4]: SpanIDAC 1: Serial No.:

*C2 [5]: ZeroIDAC 1: Model#:

An issue may exist if parameters with an asterisk (*) have changed. Contact Customer Service if this is the case. If the parameters
have not changed, continue with the next section.

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Hardware Verification

Equipment Required:

• Digital Multimeter

• Screwdriver

The ST50 ow 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, 1.6 A (amp code 1160), package 0410 (short radial leads).

Fuse (F1)

AC power customer interface circuit board shown.
Fuse (F1) on DC power customer interface circuit
board located in similar position.

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 rmly at both ends of the cable header.

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Step 3

Verify sensor element continuity and resistance.

Remove sensor element cable from the bottom of the control circuit assembly. Note that 2 of the wires have a red stripe and are
located closest to the interconnecting cable header. Using an ohmmeter verify that resistance between the 2 red striped wires is
approximately 1100 ohms ±20. This resistance is temperature dependant. The resistance at 70 degrees F is about 1082 ohms.
Verify the resistance between the 2 natural colored wires are approximately the same.

FCI provides full in-house technical support. Additional technical representation is also provided by FCI eld representatives.
Before contacting a eld or in-house representative perform the troubleshooting techniques outlined in this document. If problems
persist, contact FCI Customer Service at 1-800-854-1993 or 1-760-744-6950.

Contact FCI to obtain an Return Authorization before returning the instrument. The form contains a declaration of
decontamination cleaning information with which the instrument must comply before it is shipped to FCI.

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Transmitter Circuit Calibration Check (Delta R Verification)

References

• Delta ‘R’ Data Sheet

Equipment

• FC88 Communicator or equivalent.

• DMM

• Delta R Data Sheet – Match by serial numbers

• 2 ea. precision decade resistance boxes, 0.1% (Largest steps: 1k ohm, smallest steps 0.01 ohms)

• 250-ohm axial lead precision resistor, 0.1% or better, 1 W

• Small at blade screwdriver, 3/32 inches wide blade

• FCI normalization cable, FCI part number 006407

Procedure

Note: Thirty (30) minute warm-up required before calibration check.

1. Verify all “D” mode calibration parameters are correct according to the meter’s Delta R data sheet before starting
verication.

2. Turn power OFF.

3. Mark all sensor element wires connected to the circuit board for easy reconnection to the proper terminals. Disconnect the wires.

4. Connect the resistance decade box to the electronics as per the appropriate wiring diagram for the ST50.

Note: Interconnector wiring (resistance decade box to electronics) must be same gauge and length to avoid any
inaccuracies in the Delta R verication caused by unequal wire lengths and/or wire gauges. Use of the FCI normalization
cable avoids this issue.

5. Connect the 250-ohm precision resistor across the 4-20 mA output terminals.

6. Set both decade boxes for the nominal resistance value (1000 ohms) ±0.01%.

7. Connect DMM, set to volts DC (V), to the meter’s output termination and monitor the meter output.

8. Turn power ON and allow the instrument 5 minutes to stabilize.

9. With the FC88 connected press [T] [Enter] to view the normal operating mode.

10. Adjust the Active Decade Box (Reference decade box remains xed @ 1000 ohms) to achieve the appropriate Delta R for
the displayed ow value and output, noted on the meter’s Delta R data sheet.

11. Note the [C] mode and verify the meters displayed TCDR and REFR values corresponding to the displayed ow rate as
per the meter’s Delta R data sheet.

12. Return to normal mode operation ([T] mode).

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Appendix A - Approval Information

EU Information

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Appendix B - List Commands

Table 5. ST50 List of Single Letter Commands

Command
Mnemonic

A R AvgDelta_r, AvgRef
B R Delta_r, Ref_r
C R Tcdelta_r, Ref_r

D R Diagnostics

F R/W Kfactors
G R/W Clear FlashEE, Boxcar Count, ADC to Ohms Cal
K R/W Cal Parameters

L R/W Output Cal
N W Warm Restart

R W Factory Restore

S R/W Totalizer Menu On/Off

T R Normal Mode

V R/W Output Cong
W R/W Totalizer

Y W Command Line Interface

Z W Flow units, Pipe Size, and LCD Scaling

Command

Function

Command Description

Table 6. ST50 List of CLI Commands

Command
Mnemonic

BK R/W Break Point Float
BM R/W Boxcar Filter Max Integer
CM R/W Cminow Float

CR R/W Calibration Ref Float

CX R/W Cmaxow Float

C1[1-5] R/W Coefcients set1 Float
C2[1-5] R/W Coefcients set2 Float

DI R Diagnostics Null
DM R/W DeltaR Minimum Float
DN R/W Density Float

DR R Delta R Float

DX R/W DeltaR Maximum Float

DS R/W DeltaR Slope Float
DF R/W DeltaR Offset Float

EU R/W Engineering Units Integer

FF R/W Flow Factor Float

FP R/W Fix Point Flag Integer

F0 R/W Pulse Out State0 Integer

F1 R/W Pulse Out State1 Integer

HR R/W Tot Dump Hours Cntr Integer

IF R/W I Factor Float

Command

Function

Command Description Data Type

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Table 6. ST50 List of CLI Commands, Cont.

Command
Mnemonic

K[1-4] R/W K Factors

Command

Function

Command Description Data Type

Float
L0 R/W Line Size 0 Float
L1 R/W Line Size 1 Float

MN R/W Minow Float
MX R/W Maxow Float

NN R/W Namur Mode Integer

OM R/W Outmode Integer

PF R/W Pulse Factor Float
PL R/W Pulse Out Integer
PS R/W Pulse Sample Period Float

W

PW R/W Pulse

idth Float
P0 R/W Switch Point0 Integer
P1 R/W Switch Point1 Integer

RO R/W RollOver Cntr Long

RR R Reference R Float

RS R/W RefR Slope Float

RF R/W RefR Of

fset Float

SF R SFPS Flow Float

SN R/W Serial Number String (16 chars max.)

SO R/W Shop Order Number String (16 chars max.)

S0 R/W SpanDAC0 for 4-20mA

#1 Integer
S3 R/W SpanDAC1 for 4-20mA #2 Integer
S2 W Save FACT

ORY N/A
TC R TCDeltaR Float
TD R/W Tcslp Float

TF R/W Totalizer OFF/ON Flag Integer

TM R/W Cmintemp Float

P R/W Totalizer

T
TT R/W Totalizer

Temperature Flag Integer

Value Float

TX R/W Cmaxtemp Float

TZ R Temperature Float
T0 R/W Tcslp0 Float
T2 R/W

Tcslp2 Float
T3 R/W TSpanDAC0 for 4-20mA #1 Integer
T7 R/W TSpanDAC1 for 4-20mA #2 Integer
T5 R/W TZeroDAC0 for 4-20mA #1 Integer
T8 R/W TZeroDAC1 for 4-20mA #2 Integer

UF R User Flow Float
UK R User FlowK Float
UN R/W User Name String (16 chars max.)
VN R V

ersion Number String (16 chars max.)
XX R/W Test Flow Rate (SFPS) Float
XY W Delete T

est Flow Rat e Float
Z0 R/W ZeroDAC0 for 4-20mA #1 Integer
Z2 R/W ZeroDAC1 for 4-20mA #2 Integer

Command Line Password: 357

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ST50 Mass Flow Meter Fluid Components International LLC

Note: When invoking a Write Function, there must be a space separating the Command characters and the data value. All
Read and Write Functions are completed with a <CR>. To exit CLI, press <CR> following the last Command <CR>.

Examples: RBK<CR> (Read Breakpoint)

WBK 2222<CR> (Write Breakpoint 2222)

RC11<CR> (Read Coefcient C1,1)

WC11 –234.567<CR> (Write Coefcient C1,1, -234.567)

<CR> (Leave Command Line Mode)

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Appendix C - Drawings

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Appendix D - Customer Service

Customer Service/Technical Support

FCI provides full in-house technical support. Additional technical representation is also provided by FCI eld representatives. Before
contacting a eld or in-house representative, perform the troubleshooting techniques outlined in this document.

By Mail

Fluid Components International LLC

1755 La Costa Meadows Dr.

San Marcos, CA 92078-5115 USA

Attn: Customer Service Department

By Phone

Contact the area FCI regional representative. If a eld representative is unable to be contacted or if a situation is unable to be
resolved, contact the FCI Customer Service Department toll free at 1 [phone]

By Fax

To describe problems in a graphical or pictorial manner, send a fax including a phone or fax number to the regional representative.
Again, FCI is available by facsimile if all possibilities have been exhausted with the authorized factory representative. Our fax
number is 1 [phone]; it is available 7 days a week, 24 hours a day.

By Email

FCI Customer Service can be contacted by email at: techsupport@uidcomponents.com. Describe the problem in detail making
sure a telephone number and best time to be contacted is stated in the email.

International Support

For product information or product support outside the contiguous United States, Alaska, or Hawaii, contact your country’s FCI
International Representative or the one nearest to you.

After Hours Support

For product information visit FCI’s website at www.uidcomponents.com. For product support call 1 [phone] and follow
the prerecorded instructions.

Point of Contact

The point of contact for service, or return of equipment to FCI is your authorized FCI sales/service ofce. To locate the ofce
nearest you, visit the FCI website at www.uidcomponents.com.

Warranty Repairs or Returns

FCI prepays ground transportation charges for return of freight to the customer’s door. FCI reserves the right to return equipment
by the carrier of our choice.

International freight, handling charges, duty/entry fees for return of equipment are paid by the customer.

Non-Warranty Repairs or Returns

FCI returns repaired equipment to the customer either collect or prepaid and adds freight charges to the customer invoice.

Return to Stock Equipment

The customer is responsible for all shipping and freight charges for equipment that is returned to FCI stock from the customer
site. These items will not be credited to the customer’s account until all freight charges are cleared, along with applicable return to
stock charges, from the credit invoice. (Exceptions are made for duplicate shipments made by FCI.)

If any repair or return equipment is received at FCI, freight collect, without prior factory consent, FCI bills the sender for these charges.

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Fluid Components International LLC ST50 Mass Flow Meter

Field Service Procedures

Contact an FCI eld representative to request eld service.

A eld service technician is dispatched to the site from either the FCI factory or one of the FCI representative ofces. After the
work is complete, the technician completes a preliminary eld service report at the customer site and leaves a copy with the
customer.

Following the service call, the technician completes a formal, detailed service report. The formal report is mailed to the customer
within ve days of the technician’s return to the factory or ofce.

Field Service Rates

All eld service calls are billed at the prevailing rates as listed in the FCI Price Book unless specically excepted by the FCI
Customer Service Manager.

Customers are charged for all travel expenses including airfare, auto rental, meals and lodging. In addition, the customer shall pay
all costs of transporting parts, tools or goods to and from the job site. Invoicing travel time, eld service work and other expenses
will be performed by FCI’s Accounting Department.

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Instrument Warranty

Goods furnished by the Seller are to be within the limits and of the sizes published by the Seller and subject to the
Seller’s standard tolerances for variations. All items made by the Seller are inspected before shipment, and should any
of said items prove defective due to faults in manufacture or performance under Seller approved applications, or fail to

meet the written specications accepted by the Seller, they will be replaced or repaired by Seller at no charge to Buyer
provided return or notice of rejection of such material is made within a reasonable period but in no event longer than
one (1) year from date of shipment to Buyer, and provided further, that an examination by Seller discloses to Seller’s
reasonable satisfaction that the defect is covered by this warranty and that the Buyer has not returned the equipment in
a damaged condition due to Buyer’s or Buyer’s employees’, agents’, or representatives’ negligence and Buyer has not
tampered, modied, redesigned, misapplied, abused, or misused the goods as to cause the goods to fail. In addition,
this warranty shall not cover damage caused by Buyer’s exposure of the goods to corrosive or abrasive environments.
Moreover, Seller shall in no event be responsible for (1) the cost or repair of any work done by Buyer on material
furnished hereunder (unless specically authorized in writing in each instance by Seller), (2) the cost or repair of any
modications added by a Distributor or a third party, (3) any consequential or incidental damages, losses, or expenses
in connection with or by reason of the use of or inability to use goods purchased for any purpose, and Seller’s liability
shall be specically limited to free replacement, or refund of the purchase price, at Seller’s option, provided return or
rejection of the goods is made consistent with this paragraph, and the Seller shall in no event be liable for transportation,
installation, adjustment, loss of good will or prots, or other expenses which may arise in connection with such returned
goods, or (4) the design of products or their suitability for the purpose for which they are intended or used. Should the
Buyer receive defective goods as dened by this paragraph, the Buyer shall notify the Seller immediately, stating full
par-ticulars in support of his claim, and should the Seller agree to a return of the goods, the Buyer shall follow Seller’s
packaging and transportation directions explicitly. In no case are the goods to be returned without rst obtaining a return

authorization from the Seller. Any repair or replacement shall be at Seller’s factory, unless otherwise directed, and shall be

returned to Seller transportation prepaid by Buyer. If the returned goods shall prove defective under this clause they will
be replaced or repaired by Seller at no charge to Buyer provided the return or rejection of such material is made within a
reasonable period, but in no event longer than (1) year from the date of shipment of the returned goods or the unexpired
terms of the original warranty period whichever is later. If the goods prove to be defective under this paragraph, the Buyer
shall remove the goods immediately from the process and prepare the goods for shipment to Seller. Continued use or
operation of defective goods is not warranted by Seller and damage occurring due to continued use or operation shall
be for Buyer’s account. Any description of the goods contained in this offer is for the sole purpose of identifying them,
and any such description is not part of the basis of the bargain, and does not constitute a warranty that the goods will

conform to that description. The use of any sample or model in connec-tion with this offer is for illustrative purposes only,

is not part of the basis of the bargain, and is not to be construed as a warranty that the goods will conform to the sample
or model. No afrmation of that fact or promise made by the Seller, whether or not in this offer, will constitute a warranty
that the goods will conform to the afrmation or promise. THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL
OTHER EXPRESS OR IMPLIED WARRANTIES WITH RESPECT TO THE GOODS OR THEIR INSTALLATION, USE,
OPERATION, REPLACEMENT OR REPAIR, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR
FITNESS OF PURPOSE; AND THE GOODS ARE BEING PURCHASED BY BUYER “AS IS”. SELLER WILL NOT BE
LIABLE BY VIRTUE OF THIS WARRANTY OR OTHERWISE FOR ANY SPECIAL, INCIDENTAL OR CONSEQUENTIAL
LOSS OR DAMAGE RESULTING FROM THE USE OR LOSS OF USE OF THE GOODS.

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ST51 Mass Flow Meter

Notice of Proprietary Rights

This document is the property of Fluid Components International LLC (FCI) and contains condential and proprietary information including, without limitation, trade secrets, design,
manufacturing, processing, form t and function data, technical data, and/or cost and pricing information, developed exclusively at FCI’s private expense. Disclosure of this information
to you is expressly conditioned on your assent that its use is limited to use only within your company (and does not include manufacturing or processing uses). Any other use, includ­ing re-procurement, replication of FCI products, or other use directly or indirectly in any way detrimental to FCI’s interests is strictly prohibited without prior written consent of FCI.
This document is subject to the protections of 18USC1905 (Trade Secrets Act), 5USC552 (Freedom of Information Act), Executive Order 12600 of 6/23/87, 18USC1832 (Economic
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