Fluid Components International ST75, ST75V User Manual

ST75/ST75V MASS FLOW METER

Installation and Operation Guide

Pre-Installation

Serial number Alignment

The ST75 and ST75V (Vortab) can be specified with integral or remote electronics. The flow element has a serial number etched into the side of the HEX as shown on figure A. In addition, the tag on the enclosure will also denote serial number and model number. The associated 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 HEX flat. These flow elements have been calibrated in a particular direction and are designed to be used in service with the flow arrow going in the same direction as flow in the pipe stream. The flow element has been calibrated directly in the pipe tee or tube tee with careful consideration for orientation and insertion depth. Removal from the tee section while physically possible is not recommended unless authorized by a factory technician.

Flow Direction

FLOW

Serial Number

Figure A

Figure B

Recommended Straight Run

To optimize flow meter system performance, FCI recommends installation with a minimum of 20 diameters upstream straight run and 10 pipe diameters of downstream straight run. Where straight run limitations significantly reduce the available pipe diameters, FCI utilizes flow conditioners to produce a transferable flow profile from the calibration installation to actual field installations. FCI’s proprietary AVAL software is available to make flow meter installation evaluations where straight run limitations are considered. See Figure C for recommended installation.

FLUID COMPONENTS

INTERNATIONAL LLC

0.000 SFPS

32.2 DEGREES F

Figure C - Recommended Straight Run Condition

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ST75/ST75V MASS FLOW

Specifications

Media Compatibility:

Air, compressed air, nitrogen, oxygen, argon, CO2, ozone, other inert gases, natural gas, and other hydrocarbon gases, hydrogen.

Pipe/Line Size Compatibility: 1/4" to 2" [6 mm to 51 mm]

Instrument

ST75/ST75V Range:*

NPT Line Size

¼”

½”

¾”

1”

1 ½”

2”

Min. SCFM

0.04

0.13

0.22

0.35

0.85

1.40

Min [NCMH]

[0.07]

[0.22]

[0.38]

[0.59]

[1.44]

[2.38]

Max. SCFM

17.34

50.64

88.88

139.95

539.31

559.27

Max. [NCMH]

[29.47]

[86.04]

[151.00]

[237.78]

[576.48]

[950.20]

Tubing Line Size

¼”

½”

1”

Min. SCFM

0.01

0.05

0.25

Min [NCMH]

[0.01]

[0.09]

[0.42]

Max. SCFM

3.02

21.15

99.08

Max. [NCMH]

[5.14]

[35.94]

[168.33]

* actual range subject to gas type and specific conditions.

Accuracy:

ST75: ± 2% of reading, ± 0.5% of full scale Optional: ± 1% of reading, ± 0.5% of full scale

ST75V: ± 1% of reading, ± 0.5% of full scale

Repeatability: ± 0.5% of reading

Temperature Compensation:

Standard: 40 to 100°F [4 to 38°C]

Optional: 0 to 250°F [-18 to 121°C]

Turndown Ratio: 10:1 to 100:1

Agency Approvals:
ATEX/IEC Ex:	II 2	G Ex d IIC T6...T3
	II 2	D Ex tD A21 IP67 T90°C...T121°C
FM, CSA:	Class I, II, III, Div. 1, Groups B-G
	Class I, Div. 2, Groups A-D
CRN No.:	0F0303

Warranty: One year

Flow Element

Installation:

ST75: In-line “T”, NPT or tube

Material of Construction: All-welded 316 stainless steel probe element with Hastelloy-C thermowells; 316 stainless steel NPT and tube fittings

Maximum Operating Pressure:

ST75: T-fitting [NPT female]: 240 psi [16.5 bar(g)] Tube: 600 psi [41 barg]

ST75V: 240 psi [16.5 bar(g)]

Temperature: Operating: 0 to 250°F [-18 to 121°C]

Process Connection:

ST75: T-fitting [NPT female]: 1/4”, 1/2”, 3/4”, 1”, 1 1/2” or 2” Tubing: 1/4”, 1/2” or 1”

ST75V: Female NPT, Male NPT, Flange 1/4”, 1/2”, 3/4”, 1”, 1 1/2” or 2”

Transmitter

Enclosure: NEMA 4X [IP67], aluminum, dual conduit ports with either 1/2" Female NPT or M20x1.5 entries. Epoxy coated.

Output Signals:

(2) 4-20 mA user assignable to flow rate and/or temperature

(1) 0-1 kHz pulse for total flow

Communication Port: RS232C standard. Optional wireless IR to PDA with digital display models

Input Power:

DC: 18 Vdc to 36 Vdc (6 watts max.)

AC: 85 Vac to 265 Vac (12 watts max.; CE Mark Approval for 100 Vac to 240 Vac)

Operating Temperature Range: 0 to 140°F [-18 to 60°C]

Digital Display: (Optional)

Two-line x 16 characters LCD. Displays measured value and engineering units. Top line assigned to flow rate. Second line is user assignable to temperature reading, flow totalizer or alternating. Display can be rotated in 90° increments for optimum viewing orientation.

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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 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 flow conditioning.

Flow Element Installation

Warning: The element is shipped specifically installed in the TEE oriented for inline installation. DO not remove the sensing element from the TEE section during installation as calibrated performance can be effected.

Process Connections

The ST75 is available in pipe Tee configurations with NPT threads and tubing tees with a compression fitting suitable to clamp down on concentric smooth surface tubing. The pipe Tee versions are standard 150# class rated tees suitable for service up to 150 PSIG at the process temperature maximum of 250°F (121°C). The compression fitting material offered in the tube type configuration is rated for 250 PSIG service.

Pipe Tee Installation: With pipe extensions properly cut to length and the appropriate sealing materials used on the threads, install flow element section by slowly rotating the configuration until firmly secure on the pipe section. Complete by installing opposing end pipe section using care to firmly secure the element assembly either in a top mount or side mount position.

Tube Tee Installation: Clean all mating surfaces of the tee fitting, ferrules and the flow tube. Insert the flow tubing into the tee fitting. Make sure the tubing rests firmly in the fitting counter bore seat. Tighten the nut on both ends of the tee by hand. Hold the fitting body steady with a backup wrench, tighten the fitting nuts 1-1/4 turns, from hand tight baseline.

The ST75V is available in with flow tube configurations offering male and female NPT threads, ANSI flanges and DIN flanges. The flow tube assemblies are rated for service up to 240 PSIG at the process temperature maximum of 250°F (121°C).

NPT Flow Tube Installation: With pipe extensions properly cut to length and the appropriate sealing materials used on the threads, install flow element section by slowly rotating the configuration until firmly secure on the pipe section. Complete by installing opposing end pipe section using care to firmly secure the element assembly either in a top mount or side mount position.

Flanged Installation: Clean all mating surfaces. Install appropriate sealing gasket between mating flanges. Tighten flange mating hardware to meet system sealing requiments.

See Appendix C for instrument outline dimentional details.

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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 megaohm 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 megaohm 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 trouble shooting.

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.

See Safety instructions in Appendix A for the use of the ST75/ST75V series (AC and DC versions) in Hazardous Areas

Category II (Zone 1). Approval, KEMA 08ATEX0045/IECEx KEMA08.0012 for Category 2 GD protection Ex d IIC T6..T1, Ex tD A21 IP67 T 90°C...Τ 121° C.

Input Power

The ST75/ST75V is available with both VDC and VAC 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 AC or DC power. Only connect the power specified on the wiring module as shown on Figures E and F respectively. Both VAC and VDC inputs require a Gnd wire to be connected. Input power terminal blocks are rated for 14-26 AWG.

To wire the instrument, ensure that the power is off. 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 E and F. Note that when the 4-20mA outputs are used simultaneously, a single return lead is used.

Analog Output

4-20mA: The instrument is provided with a standard set up, of two 4-20mA outputs. Output 1 configured for flow and Output 2 configured for temperature. Terminal blocks rated for 14-28 AWG., 500 ohm max load per output.

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Pulse Output Activation

The ST75/ST75V provides a pulse output feature. Instruments ordered with volumetric or mass flow units will be factory set with totalizer and pulse output activated. The mode can be changed in the field. Wiring either sink or source mode is shown in Figures E and F below. Though only one configuration is shown with the VAC and VDC power supplies, the source or sink can be utilized with either power input.

Sink Mode: 40 VDC Max, 150 mA max. Customer supplied power source Source Mode: 15 VDC output, 50 mA max

VDC Power Connection

RS 232 Connection

Figure E

VDC Power

As Shown:

18-36VDC power connected with gnd

4-20mA connected for flow and temperature Pulse Out in source mode

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

VAC Power Connection

RS 232 Connection

Figure F

VAC Power

As Shown:

85-265 VAC power connected with gnd

4-20mA connected for flow and temperature Pulse Out in sink mode

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

Power Disspation

AC Version

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

DC Version

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

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ST75/ST75V MASS FLOW

Setup Interface

All parameters on this meter are set through the RS232 interface connection (P3 plug) or PDA IR interface. A jumper selection determines which communication mode is active. The factory default communication mode is set for the RS232 interface. This setting allows the instrument to be setup with either a 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 Computer Serial Port) is required and may be obtained from FCI: Part No. 014108-02.

Using Windows Terminal (usually located in Accessories) execute the program by double-clicking on the Terminal Icon.

1.Go to Settings.

2.Click on Communication.

3.Set for COM1 or COM2, 9600 Baud, 8 Bit, and No Parity. Press OK

4.Press the ENTER key to see the Input Mode? prompt.

5.Enter any of the meters single letter commands to execute a function (reference complete function menu in Appendix B).

If the PDA IR interface is used for communication, then jumper JP5 needs to be moved to the alternate position, see Figure G and H. See PDA IR Communication Interface section for more details.

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 Appendix B - Table 6 for command line details.

JP5

Figure G	Figure H
JP5 factory set for RS232 interface	JP5 set for PDA IR interface

Infra Red Communications Window

Flow Rate, Total and Temperature Indicator

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Start up and Commissioning

1.Verify all Input power and output signal wiring is correct and ready for initial power start up.

2.Apply power to instrument. The instrument will initialize in the Normal Operation Mode. All outputs will be active and instruments with the display option will indicate flow with the factory set flow unit. Allow 10 minutes for the instrument to warm up and come to the thermal equilibrium.

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

Command	Name	Description
T	Normal Operation Mode	All outputs are active
Z	Flow Unit Set-Up	Select Flow Units(4 English, 4
		Metric)Pipe Dimensions
W	Totalizer	Enable/Disable
V	Output Configuration	Select one of 4 Configurations:
		Pulse and/or AlarmPulse factor and/or
		setpoint
F	K-Factor (default=1)	Flow factor
N	Warm Re-set	Re-initialize C/B
S	Totalizer Menu	Enables W menu (Option)

If the instrument is installed, and the process flow is zero, the instrument should indicate 0.000.

Flow Unit Modification

Example: SCFM Flow Units and 3 inch Sch 40 round pipe size set up:

	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,	English units
		4=GPM #
	1	R round duct or S rectangular>	Select Standard Ft3/Min (SCFM)
	R	Dia.: 4.0260000	Select Round Duct
		Change? (Y/N)>
	Y	Enter value: #
	3.068	area: 7.3926572 CMinflow: 0.0000000	3 inch Sch. 40 pipe I.D.
		Change? (Y/N)>
	N	Maximum flow: 462.04
		Enter to continue
	Y	Cmaxflow: 462.04
		Change? (Y/N)>
	Y	#
	462.04	CMintemp (F): -40.00000
		Change? (Y/N)>
	N	CMaxtemp (F): 250.00000
		Change? (Y/N)>
	N	Percent of Range is: OFF
		Change to ON?>
	N	LCD Mult Factor x1
		Change? (Y/N)>
	N	100.0 SCFM	Instrument will end up in Normal
			Operation Mode

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ST75/ST75V MASS FLOW

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 (4-20mA), the new zero (4mA) must be equal to or greater than 1 SCFM, the new span (20mA) 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 can not exit some routines unless all entries are completed or the power is recycled.

The top level of the menu is shown in Appendix B - Table 5. Enter the large letter in the tables below to activate a command. The user may exit a command at any time entering “Q” [ENTER] in the menus: D, K, V, W, or Z.

CCalibration Information

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

DDiagnostics

Display only: List of unit prameters.

KFactory Calibration Settings

Display only: Cal. parameters, i.e. linearization and temperature compensation coefficients.

RFactory Reset

Replaces user data with factory calibration data

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
Select	For Volumetric or Mass Flow
	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)

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

Table 1. Diagnostics and Factory Settings				Table 2. “Z” Flow Units Set-Up and Scaling
	Analog out	1	2	3	4
	Select
	4-20mA out 1	Flow	Flow	Temp	Temp
	4-20mA out 2	Temp	Flow	Flow	Temp
	Pulse out	1	2	3	4
	Select
	Source out	Pulse	Pulse	Alarm0	Alarm0
	Set	Factor	Factor	Set pt.0	Set pt.0
	Set	Period	Period	State0	State0
	Set	State0	State0
	Sink	Pulse	Alarm1	Pulse	Alarm1
	Set		Set pt.1	Factor	Set pt.1
	Set	State1	State1	Period	State1
				State1

Table 3. “V” Output Configuration Set-Up

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“V” Menu Output Configuration Set Up

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 confirmation. If you miss the option, select [Enter] repeatedly to loop around.

Analog out			Pulse out
Output Mode			Pulse Out			PFactor: 1.000
Selected			Selected			Change? (Y/N)>
4-20mA #1:	Flow		Source:	Pulse		if yes
						Enter new factor: ____
4-20mA #2:	Temp		Sink:	Pulse		Sample Period: 1 second
Change? (Y/N)>			Change? (Y/N)>			Change? (Y/N)>
						if yes
			Source:		Pulse	Enter new Sample Period: ____
4-20mA #1:		Flow	Sink:		Pulse
4-20mA #2:		Temp			Enter 1 to make	If alarm is a selected output
		Enter 1 to make			the selection #__	Set point1: 000	Set points are in the
		the selection__	Source:		Pulse		same units as the flow
4-20mA #1:			Sink:		Alarm1		or temp.
4-20mA #2:		Flow			Enter 2 to make	Change? (Y/N)>
		Enter 2 to make			the selection #__	if yes
		the selection__	Source:		Alarm0	Enter new set point: ____
4-20mA #1:		Temp	Sink:		Pulse	Resume normal operation
4-20mA #2:		Flow			Enter 3 to make
		Enter 3 to make			the selection #__	Source state:
		the selection__	Source:		Alarm0	High to Low
4-20mA #1:		Temp	Sink:		Alarm1
4-20mA #2:		Temp			Enter 4 to make	Change to Low to High?>
		Enter 4 to make			the selection #__
		the selection__

Example: COMMAND V (Reference Table 3)

Case: 4-20mA #1 = flow, 4-20mA #2 = Temperature,				Source Out = Pulse,		Sink = Alarm
Pressing [V] [ENTER] will display			“Output Mode Selected”		followed by:
“4-20mA #1 = Flow”			“ 4-20mA #2 = Temp”		followed by
“Change? (Y/N)”
Press [ENTER] (no change).
The last saved mode will display at this point. i.e.,
“Source: Pulse”			“Sink: Pulse”		followed by,
“Change? (Y/N)”			Select Y [Enter].		The display reads,
“Source: Pulse”			“Sink: Pulse”		followed by,
“Enter 1 to make the selction #.”			Select [ENTER].		The next display reads,
“Source: Pulse”			“Sink: Alarm”		followed by,
“Enter 2 to make the selction #.”			Select 2 and [ENTER].		The next prompt reads,
“PFactor: 1.000”			“Change? (Y/N)>”		(this factor can be anywhere from 0.001 to 1000 - A
					pulse factor of 1.000 will output 1 pulse per unit of
					flow.)
If no change, select N and/or [ENTER] to continue.
The next prompt is, “Sample Period”
“Change? (Y/N)>”			(this value may be set from 0.5 to 5 seconds)
If no change, select N and/or [ENTER] to continue.
The next prompt is, “Source state: ”			“High to Low” Change to “Low to High?>” (this selection toggles the pulse
						signal normally high or normally
						low).
[ENTER] to read display.
“Switchpt1”	“0.0000000”	the current set point.
“Change? (Y/N)>” enter Y [ENTER] and enter				#______ . Set Point Value , i.e. 50 (value is in same units as the flow and
must be within the calibrated range). [ENTER]. The next prompt is,

“Sink state: ” “High to Low” Change to “Low to High?>”. Set the output signal to be normally “High” or normally “Low.” Pressing [Y] [ENTER] toggles the current setting. Pressing [ENTER] resumes normal operation.

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ST75/ST75V MASS FLOW

PDA IR Communication Interface

The IR interface software is an optional accessory kit and can ordered using FCI part number 019819-01. The software is compatible with PALM OS 4.1 or greater. If the software was ordered with the instrument, a CD should be located with the instrument documentation.

The factory has verified the following 3 PDA models. All commands meet their intended purpose and function properly.

1.Palm, Tungsten E, E2:Palm OS 5.2.1, 5.4.7

2.Palm, Zire 71, Palm OS 5.2.1

3.ecom instruments, m 515-EX, Intrinsically-safe. Palm OS 4.1

Procedure:

1.Down load the software into the target PDA. When complete, a yellow and blue FCI icon will be available.

2.Verify JP5 jumper is set in the PDA IR interface position, see Figure H.

3.Select FCI icon on PDA device.

4.The opening menu is displayed, select start.

5.Five menu groups are displayed.

Process:	displays current process variables (Flow and Temperature)
ID-Unit:	displays model, firmware version, serial no. …
Set-up:	allows access to the following areas
	Units	K Factor
	Line size	Temp/Flow min/max
	Totalizer	Output Cal
	LCD	Output Config
Diagnostics:	A/D values
Utilities:	allows access to the following areas
	Reset
	Parameter memory
	Calibration coefficients
	Factory restore
	Process and System Faults

6.After entering into specific menu areas, point the PDA IR port towards the Instrument display. Begin with the PDA device within 5 feet of the instrument display. Select the “Get All” or “Get” button to retrieve information from the instrument. If a value needs to be changed, the value must first be retrieved.

Example: reading standard process variable information

1.Verify instrument and PDA are functioning.

2.Select FCI icon on the PDA.

3.Select the start button on the opening screen.

4.Select the “Process” button.

5.Point the PDA at the instrument display, start with the PDA no futher that 5 feet from the instrument.

6.Select the “Get Data” button.

7.Flow and temperature Data will begin streaming to the PDA.

8.If the IR link is interrupted, a “Command response timed out” message will be displayed.

9.Repeat the process if the link is interrupted.

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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 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).

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ST75/ST75V MASS FLOW

Troubleshooting

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.

Verify Standard Versus Actual Process Conditions

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:

Q = Q		×	PA	×	TS
	A
S			TA		PS
Where:
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.

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

Example:

QA= 1212.7 ACFM PA= 19.7 PSIA PS= 14.7 PSIA

	(Metric: PS = 1.01325 bar(a)
QS= 1485 SCFM	TS = 21.1°C (294.1K))
TA= 120°F (580°R)
TS= 70°F (530°R)

	1212.7 ACFM	19.7 PSIA	) (	)
				530° R_	=1485 SCFM
	( 1	)( 580° R	14.7 PSIA

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Doc. No. 06EN003368 Rev. C