Sierra FastFlo 620S User manual

FastFlo™ 620S Instruction Manual Table of Contents
IM-62S 0-1
FastFlo™620S
Insertion Mass Flow Meter
Instruction Manual
Part Number IM-62S
Revision L, November 2022

Table of Contents FastFlo™ 620S Instruction Manual
0-2 IM-62S
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© COPYRIGHT SIERRA INSTRUMENTS 2014
No part of this publication may be copied or distributed, transmitted, transcribed, stored in a re-
trieval system, or translated into any human or computer language, in any form or by any means,
electronic, mechanical, manual, or otherwise, or disclosed to third parties without the express writ-
ten permission of Sierra Instruments. The information contained in this manual is subject to change
without notice.
TRADEMARKS
FastFlo™ and Smart Interface™ Series is a Registered Trademark of Sierra Instruments, Inc. Oth-
er product and company names listed in this manual are trademarks or trade names of their re-
spective manufacturers.

FastFlo™ 620S Instruction Manual Table of Contents
IM-62S 0-3
Table of Contents
Chapter 1 Introduction
FastFlo™ 620S Mass Flow Meters....................................................... 1-1
Using this Manual .......................................................................... 1-1
Note and Safety Information .......................................................... 1-2
Receipt of System Components..................................................... 1-2
Technical Assistance ..................................................................... 1-2
The FastFlo 620S Flow Sensing Principle............................................ 1-3
FastFlo™ Electronics Features ............................................................ 1-4
Enclosure Options ................................................................................ 1-5
Smart Interface Software...................................................................... 1-5
Chapter 2 Installation and Wiring
Installation Overview ............................................................................ 2-1
Site Selection................................................................................. 2-1
Unobstructed Flow Requirements.................................................. 2-2
Installation ............................................................................................ 2-3
Wiring Connections .............................................................................. 2-4
Input Power Wiring......................................................................... 2-4
Output Signal Wiring...................................................................... 2-5
Alarm Output Wiring....................................................................... 2-7
Remote Sensor Probe Wiring ........................................................ 2-8
Range Selection Wiring ................................................................. 2-9
Chapter 3 Operating Instructions
Using the FastFlo™ Electronics Basic Features................................... 3-1
Using the Single-Digit LED for Programming................................. 3-2
Using the LCD Display for Programming ....................................... 3-3
Entering Alarm Parameters............................................................ 3-4
K-factor Adjustment ....................................................................... 3-5
User Full Scale Adjustment............................................................ 3-6
Time Response Delay Adjustment................................................. 3-7
Totalizer Reset............................................................................... 3-7
Using the FastFlo™ Electronics Advanced Features ........................... 3-8
Voltage Zero Adjustment ............................................................... 3-8
Voltage Span Adjustment .............................................................. 3-8
Current Zero Adjustment................................................................ 3-9
Current Span Adjustment............................................................... 3-9
Instrument Validation.......................................................................... 3-10
Electronics Validation Procedure ................................................. 3-11
Sensor Validation Procedure ....................................................... 3-12

Table of Contents FastFlo™ 620S Instruction Manual
0-4 IM-62S
Chapter 4 Troubleshooting and Repair
Troubleshooting the Flow Meter ........................................................... 4-1
Obtaining a Return Material Authorization............................................ 4-3
Appendix A Product Specifications
Appendix B Warranty Policy
List of Figures
1-1. FastFlo 620S™ Sensor Assembly........................................... 1-3
2-1. Recommended Pipe Length Requirements............................. 2-2
2-2. Wiring Access.......................................................................... 2-4
2-3. Input Power Connections ........................................................ 2-4
2-4. Output Signal Wiring................................................................ 2-5
2-5. Isolated 4-20 mA Current Loop Connections........................... 2-6
2-6. Non-isolated 4-20 mA Current Loop Connections ................... 2-6
2-7. Isolated Alarm Output Connections......................................... 2-7
2-8. Non-isolated Alarm Output Connections ................................. 2-7
2-9. Remote Electronics to Sensor Connections ............................ 2-8
2-10. Sensor J Box to Remote Enclosure Connections.................... 2-8
2-11. Range Selection Wiring........................................................... 2-9
3-1. Display/Keypad Commands .................................................... 3-1
3-2. Electronics Validation Component Locations ........................ 3-10
3-3. Sensor Validation Component Locations............................... 3-12
List of Tables
3-1. Electronics Validation Results ............................................... 3-12
3-2. Sensor Validation Results ..................................................... 3-13

FastFlo™ 620S Instruction Manual Table of Contents
IM-62S 0-5
Warnings and Cautions
Warning! All wiring procedures must be performed with the power Off.
Warning! To avoid potential electric shock, follow National Electric Code safety practices or
your local regulations when wiring this unit to a power source and to peripheral devices. Fail-
ure to do so could result in injury or death.
Warning! Do not power the flow meter with the sensor jumper wires disconnected. This could
cause over-heating of the sensors and/or damage to the electronics.
Warning! Always remove main power before disassembling any part of the mass flow meter.
Caution! Before making adjustments to the Smart electronics device, verify the flow meter
is not actively monitoring or reporting to any master control system. Adjustments to the elec-
tronics will cause direct changes to flow control settings.
Caution! All flow meter connections and fittings for pipe tapping must have the same or
higher pressure rating as the main pipeline.
Caution! To avoid serious injury, DO NOT loosen a compression fitting under pressure.
Catuion! Before attempting any flow meter repair, verify that the line is de-pressurized.
Caution! Printed circuit boards are sensitive to electrostatic discharge. To avoid dam-
aging the board, follow these precautions to minimize the risk of damage:
•before handling the assembly, discharge your body by touching a grounded, metal
object
•handle all cards by their edges unless otherwise required
•when possible, use grounded electrostatic discharge wrist straps when handling
sensitive components

FastFlo™ 620S Instruction Manual Chapter1 Introduction
IM-62S 1-1
Chapter 1 Introduction
FastFlo 620S Mass Flow Meters
Sierra’s FastFlo™ 620S provides a reliable solution f or natural gas,
methane, or propane gas f low measurement applications. Low-f low
sensitivity, f ast response and outstanding rangeability have made
this mod el the instrument of choice f or many critical gas f low applica-
tions.
The FastFlo microprocessor-based transmitter integrates the f unctions
of flow-range adjustment, meter validation and diagnostics in a probe-
mounted or remote NEMA 4X (IP65) housing. Mass f low rate and total-
ized f low, as well as other conf ig uration variables can be displayed on
the meter’s optional 2 x 12 backlit LCD panel. The meter provides an
optical/galvanic isolated flow output, two alarm outputs and one contact
input f or range or gas selection. The programmable transmitter is easily
co nf igured via RS-232 and Sierra’s Smart Interf ace sof tware or through
three push buttons built into the device.
Depending on the probe length, the FastFlo 620S is suitable f or pipes
or ducts from 1 inch up to 24 inches (DN25 up to DN600) . The
FastFlo’s simple installation combines with an easy-to-use interf ace
that provides quick set up, long term reliability and accurate mass f low
measurement over a wide range of conditions. Modbus communication
is standard.
Using This Manual
This manual provides the inf ormation you need to install and operate the
FastFlo 620S The f our chapters of this manual cover these areas:
•Chapter 1 includes the introduction and product description
•Chapter 2 provides installation and wiring instructions
•Chapter 3 describes system operation and programming
•Chapter 4 covers troubleshooting and repair
The product specif icatio ns and dimensional drawings are f ound in Ap-
pendix A. Dimensional drawings of the Packing Gland f or the Hot Tap
are in Appendix B. Modbus details are in Appendix C.

Chapter 1 Introduction FastFlo™620S Instruction Manual
1-2 IM-62S
Note and Safety Information
We use note, caution and warning statements throughout this book to
draw your attention to important inf ormation.
Warning!
Caution!
Note
This statement ap-
pears with inf ormation
that is important to
protect people and
equipment f rom dam-
age. Pay very close
attention to all warn-
ings that apply to your
application.
This statement ap-
pears with inf or-
mation that is im-
portant for protecting
your equipment and
performance. Read
and follow all cau-
tions that apply to
your application.
This statement ap-
pears with a short
message to alert you
to an important detail.
Receipt of System Components
When receiving a Sierra mass f low meter, caref ully check the outside
packing carton f or damage incurred in shipment. If the carton is dam-
aged, notif y the local carrier and submit a report to the f actory or distribu-
tor. Remove the packing slip and check that all ordered components are
present. Make sure any spare parts or accessories are not discarded
with the packing material. Do not return any equipment to the f actory
without a Return Material Authorization (RMA, see Chapter 4).
Technical Assistance
If you encounter a problem with your f low meter, review the conf iguration
inf ormation f or each step of the installation, operation and setup proce-
dures. Verif y that your settings and adjustments are consistent with f acto-
ry recommendations. Ref er to Chapter 4, Troubleshooting, for specific in-
f ormation and recommendations.
If the problem persists after following the troubleshooting procedures out-
lined in Chapter 4, contact Sierra Instruments by f ax or by E-mail (ser-
[e-mail]). For phone support you may call (800)
866-0200 or [phone] between 8:00 a.m.
and 5:00 p.m. PST. In Europe contact Sierra Instruments b.v. at
[phone]. When contacting Technical Support, make sure to in-
clude this inf ormation:
•the f low range, serial number and Sierra order number and model
number (all marked on the meter nameplate)
•if possible, the f irmware version (visible at start up on the
meter display)
•the problem you are encountering and any corrective action taken
•application inf ormation (gas, pressure, temperature, piping
conf iguration)

FastFlo™ 620S Instruction Manual Chapter1 Introduction
IM-62S 1-3
The FastFlo 620S Flow Sensing Principle
Sierra’s unique FastFlo 620S sensor probe is responsible f or the unsur-
passed accuracy and reliability of Sierra mass f lo w meters. The sensor
consists of two sensing elements–a velocity sensor and a temperature
sensor which automatically corrects f or changes in gas temperature.
When power is applied to the f low meter, the transducer electronics
heats the velocity sensor to a constant temperature dif f erential ab ove the
gas temperature and measures the cooling eff ect of the gas f lo w. The
electrical power required to maintain a constant temperature dif f erential
is directly proportional to the gas mass f low rate. The meter electronics
measure this power and convert it into a linear 0-5 VDC (0-10 VDC op-
tional) and 4-20 mA output signal.
The FastFlo sensors are ref erence-grade platinum resistance tempera-
ture detectors (RTD) encapsulated in glass. The platinum RTD wire is
wound on a rugged ceramic mandrel f or strength and stability. The sen-
sor is located at the tip of a 0.375 inch (3/8”) diameter, 304 stainless
steel probe which is inserted in the gas stream. The 620S electronics
are packaged in a weather-proof NEMA 4X (IP65) enclosure mounted ei-
ther directly on the sensing probe or remotely up to 100 f eet (60 meters)
away.
Figure 1-1. FastFlo620SSensorAssembly

Chapter 1 Introduction FastFlo™620S Instruction Manual
1-4 IM-62S
FastFlo Electronics Features
Instrument Validation
Two simple tests offer full “field-validation” of your FastFlo mass flow me-
ter. The f irst test checks the system electronics, linearization and micro-
processor functionality. This is perf ormed by injecting a known input val-
ue and conf irming that the f low meter outputs the expected value. The
second test verif ies that the instrument’s primary sensing elements have
not drif ted or shif ted f rom their original calibration. This is accomplished
by measuring the resistance of the velocity and temperature sensors and
comparing the results to the NIST-traceable calibration data provided with
the f low meter. Together, these tests conf irm that your meter is working
correctly and the calibration variables did not drif t, shif t or change values.
Dual Range or Dual Gas Calibration (Optional)
Select one of two f actory calibrated f low ranges using a simple external
customer-supplied single contact closure.
User Full Scale Flow Rate
Field-conf ig ure f rom 50% to 100% of the f actory f ull scale setting (f acto ry
f ull scale is normally set to 125% of the user-specif ied maximum f low rate).
This adjustment can be made f or each f low range.
Alarms
Program high and low or window alarm limits independently f or each f low
range. The solid state contacts are isolated with one common.
K-Factor Correction
Change the calibration correction f actor to compensate f o r f low profile dis-
turbances or specif ic application conditions. The K-factor is a multiplica-
tion factor applied to the linearized f low signal. You may set the K-f actor
individually f or each f low range.
Dual Output Signals
FastFlo of f er two separate linear output signals proportional to flow, 0-
5 VDC (0-10 VDC optional) and 4-20 mA. The 4-20 mA output can be
field-conf igured as an active loop powered by the f low meter or an op-
tically isolated passive loop requiring an external power supply.

FastFlo™ 620S Instruction Manual Chapter1 Introduction
IM-62S 1-5
Totalizer
With the optional LCD display, actual mass flow appears on line 1 and
the totalized f low on line 2 both in the user-specif ied engineering units.
The totalizer counts only the selected range and when ranges are
switched, the value of the non-selected range is stored in memory. You
may reset the totalizer using the 3 f unction buttons mounted on the PCA
or by using a hand-held magnet.
NOTE: The totalizer will display a real-time value, but the EPROM re-
quires 6 minutes to store it. Always wait 6 minutes to remove power or
this most recent f low accumulation may be lost.
Zero and Span Outputs
Validate and adjust the settings to ensure output circuits are correct.
Time Response Delay
Select f rom a low respo nse f or f aster tracking to a high resp onse f or a
smoother output.
Enclosure Options
Flow meter electronics are available mounted directly to the f low body, or
remotely mounted up to 100 f eet (60 meters) away. The electronics
housing may be used indoors or outdoors.
Display options include a 2 x 12 character LCD display of mass f low rate
including totalized mass, or a single-digit LED located on the device print-
ed circuit board. Local operation and reconf iguration is accomplished us-
ing the three push buttons operated via f inger to uch. FastFlo electronics
include nonvolatile memory that sto res all conf iguration inf ormation. The
memory allows the f low meter to f unction immediately upon power up, or
af ter an interruption in power.
Smart Interface™Software
Sierra’s Smart Interf ace Windows™-based sof tware is available f or con-
necting your PC directly to the FastFlo™. An RS-232 serial cable along
with CD-ROM containing the program and system f iles are available
f rom the f actory. See the Smart Interf ace User Guide included with the
so f tware f or op erating instructions.

FastFlo™ 620S Instruction Manual Chapter 2 Installation
IM-62S 2-1
Chapter 2 Installation
Installation Overview
The FastFlo 620S flow meter is factory calibrated to the specific pipe size
shown on the meter’s Certificate of Calibration. The factory calibration
eliminates the task of calculating the average flow across the pipe to de-
termine the correct insertion depth. Simply insert the flow meter sensor
to the centerline position of the pipe. (If the pipe size differs from the me-
ter’s calibrated size, return the meter to the factory for re-calibration.)
When selecting an installation site, make sure that:
1. Line pressure and temperature will not exceed the flow meter rating.
Temperature should not vary more than 120°F (50°C) from the cali-
bration temperature. Line pressure should not vary more than 50
psi (3.4 bar) around the calibrated pressure.
2. The location meets the required minimum number of pipe diam-
eters upstream and downstream of the sensor head (see Figure
2-1).
3. Safe and convenient access with adequate clearance. Also, verify the
meter is located where the gas is clean and dry and the meter is cali-
brated for the gas to be measured.
4. For remote installations, verify the supplied cable length is sufficient to
connect the flow meter sensor to the remote electronics. (Do not ex-
tend or shorten the supplied cable between the probe and the elec-
tronics.)
Also, before installation check your flow system for anomalies such as:
•leaks
•valves or restrictions in the flow path that could create disturbances
in the flow profile that might cause unexpected flow rate indications
•heaters that might cause rapid excursions in the measured temperature

Chapter 2 Installation FastFlo™ 620S Instruction Manual
2-2 IM-62S
Unobstructed Flow Requirements
Select an installation site that will minimize possible distortion in the flow
profile. Valves, elbows, control valves and other piping components may
cause flow disturbances. Check your specific piping condition against
the examples shown below. In order to achieve accurate and repeatable
performance install the flow meter using the recommended number of
straight run pipe diameters upstream and downstream of the sensor.
Example
A – Upstream
(
1
)
Requirements
B – Downstream
(2)
Requirements
1
15 D
5 D
2
20 D
5 D
3
40 D
10 D
4
15 D
5 D
5
30 D
10 D
6
40 D
5 D
(1) Number of diameters (D) of straight pipe required between upstream disturbance and the flow meter.
(2) Number of diameters (D) of straight pipe required downstream of the flow meter.
Figure 2-1. Recommended Pipe Length Requirements for Installation

FastFlo™ 620S Instruction Manual Chapter 2 Installation
IM-62S 2-3
Installation
Use the following data as a guide to prepare the pipe for flow meter in-
sertion. Refer to a standard code for all pipe tapping operations. The
following instructions are general in nature and intended for guideline
purposes only.
1. Turn off the flow of process gas. Verify that the line is not pressur-
ized.
2. Confirm that the installation site meets the minimum upstream and
downstream pipe diameter requirements. See Figure 2-1.
3. Use a cutting torch or sharp cutting tool to tap into the pipe. The
pipe opening must be at least .375 inches in diameter. (Do not at-
tempt to insert the sensor probe through a smaller hole.)
4. Remove all burrs from the tap. Rough edges may cause flow profile
distortions that could affect flow meter accuracy. Also, obstructions
could damage the sensor assembly when inserting into the pipe.
5. Mount the 3/8 inch compression fitting on the pipe. Make sure this
connection is within ± 5° perpendicular to the pipe centerline.
6. When installed, cap the fitting. Run a static pressure check on the
connection. If pressure loss or leaks are detected, repair the connec-
tion and re-test.
7. Insert the sensor probe through the
compression fitting into the pipe.
The correct insertion depth places
the centerline of the sensor access
hole in the probe at the pipe center-
line. NOTE: Make sure on smaller
pipes that the probe does not end
up closer than ¼-inch from the far
pipe wall or it may be damaged.
8. Align the sensor head using the flow direction indicator. Adjust the
indicator parallel to the pipe and pointing downstream in the direction
of flow.
9. Tighten the compression fitting to lock the flow meter in position.
When the compression fitting is tightened, the position is permanent
(unless using Teflon ferrules).
10. Units may be hot-tapped. A suitable packing gland is required (See
Appendix B).
Caution!
All flow meter connec-
tions and fittings must
have the same or
higher pressure rating
as the main pipeline.
Caution!
To avoid serious in-
jury, DO NOT loos-
en the compression
fitting
under pressure.
Flow
direct ion
indicat or
points
downst ream
Flow Pipe cent erline

Chapter 2 Installation FastFlo™ 620S Instruction Manual
2-4 IM-62S
Wiring Connections
The NEMA 4X enclosure contains an integral wiring compartment with one dual
strip terminal block for power and signal connections and one dual strip terminal
block for sensor connections. The enclosure has one 1/2 inch female NPT con-
duit entry. The terminal designations are labeled inside the enclosure cover.
Figure 2-2. Wiring Access
Input Power Wiring
Depending on the flow meter configuration, connect 18 to 30 VDC (625
mA load, maximum) as shown below. Confirm power configuration be-
fore applying power. See the flow meter nameplate for input power rat-
ing.
Figure 2-3. Input Power Connections
Smart electronics
and wiring connections
inside cov er
To access components:
1. Loosen 4 screws.
2. Remov e cov er.
1/2 inch
FNPT
conduit
entry
TB2
PWR (+)
PWR (–)
+
–Power & signal
1
2
15
16
Sensor
12
56
TB1
Warning!
All wiring procedures
must be performed
with the power Off.
Warning!
To avoid potential electric
shock, follow National
Electric Code safety prac-
tices or your local code
when wiring this unit to a
power source and to pe-
ripheral devices. Failure to
do so could result in injury
or death.
Note!
The FastFlo input power is
a Sierra exclusive at 18 to
30 VDC.

FastFlo™ 620S Instruction Manual Chapter 2 Installation
IM-62S 2-5
Output Signal Wiring
All flow meters are equipped with either a calibrated 0-5 VDC (0-10 VDC
optional) or a calibrated 4-20 mA output signal. These linear output sig-
nals represent 0-100% of the flow meter user full scale.
DC Output Wiring
The 0-5 VDC (0-10 VDC optional) signal can drive a load of 1000 Ohms.
The optional 0-10 VDC output signal is not available for power sources
below 15 VDC. Connect as shown below.
Figure 2-4. VDC Output Wiring Connections
4-20 mA Output Wiring
The 4-20 mA current loop output can be self-powered by the flow meter’s
power supply (non-isolated) or externally powered (isolated) requiring a
separate 18 to 30 VDC power supply.
Rload is the total resistance in the loop, including the wiring resistance.
To calculate Rmax, the maximum Rload for the loop, use the maximum loop
current, 20 mA. The voltage drop in the loop due to resistance is 20 mA
times Rload and this drop is subtracted from the input voltage. Thus:
Rmax the maximum load resistance = 50 *(Vsupply – 7.5V)
To use an external power supply for an isolated 4-20 mA output, connect
as shown in Figure 2-5. For an internally powered non-isolated 4-20 mA
output, connect as shown in Figure 2-6.
V out (+)
V out (–)
1
2
15
16

Chapter 2 Installation FastFlo™ 620S Instruction Manual
2-6 IM-62S
Figure 2-5. Isolated 4-20 mA Current Loop Connections
Figure 2-6. Non-isolated 4-20 mA Current Loop Connections
4-20 out (+)
V out (–)
AUX PWR OUT
Jumper
Current
R load
1
2
15
16
(Common)

FastFlo™ 620S Instruction Manual Chapter 2 Installation
IM-62S 2-7
Alarm Output Wiring
Two alarm outputs (Low Alarm and High Alarm) are included on the flow
meter terminal block. The alarm outputs relays are normally-open single-
pole relays with one common connection.
There are two connection options for alarm outputs–the first with a separate
power supply (isolated) and the second using the flow meter power supply
(non-isolated). Use a separate power supply if a specific voltage is needed
for the alarm output. Use the second (non-isolated) configuration if the volt-
age at the flow meter’s power supply is an acceptable driver voltage for the
load connected. (Take into account that the current used by your alarm loads
have to come from the flow meter’s power supply.) In either case, the voltage
of the alarm output is the same as the voltage supplied to the circuit.
To use an external power supply for an isolated alarm output, connect as
shown in Figure 2-7. To use the internally powered, non-isolated alarm
output connect as shown in Figure 2-8. For a window alarm connect
both outputs together.
Figure 2-7. Isolated Alarm Output Connections
Figure 2-8. Non-isolated Alarm Output Connections
ALRM RT N
Load Load
LO ALARM (–)
HI ALARM (–)
AC or DC
power supply 1 2
15
16
ALRM RT N
LoadLoad
LO ALARM (–)
HI ALARM (–)
COMMON
AUX DC PWR OUT
1
2
15
16

Chapter 2 Installation FastFlo™ 620S Instruction Manual
2-8 IM-62S
Remote Sensor Probe Wiring
Use only factory supplied cables when connecting the sensor probe to
a remotely mounted flow meter enclosure. The electronics, sensors
and interconnecting cables supplied by Sierra Instruments are calibrat-
ed as a complete precision mass flow circuit.
To connect the sensor probe to a remotely mounted electronics enclo-
sure, see Figure 2-9. To make wiring connections from a sensor probe
junction box to a remotely mounted enclosure, see Figure 2-10.
Figure 2-9. Remote Electronics Enclosure to Sensor Connections
Figure 2-10. Sensor Junction Box to Remote Enclosure Connections
Velocity
sensor
RED
GREEN
ORA NGE
WHIT E
BLACK
Temperat ure
sensor
Remote
enclosure Sensor
probe
56
12
RED
GREEN
ORA NGE
WHIT E
BLACK
Remote
enclosure
Sensor
probe
junction
box
12
56
Caution!
Changing the length of
cables or interchanging
sensors or sensor wiring
will affect the accuracy of
the flow meter. You can-
not add or subtract wire
length without returning
the meter to the factory
for re-calibration.

FastFlo™ 620S Instruction Manual Chapter 2 Installation
IM-62S 2-9
Range Selection Wiring
If your meter is equipped with an optional second range calibration, con-
nect a contact switch as shown below. When the switch is closed the de-
vice changes to Range 2. Open the switch to return to Range 1.
Figure 2-11. Range Selection Wiring
Range 2
RNG 2
GND
Range 1
1
2
15
16

FastFlo™ 620S Instruction Manual Chapter 3 Operation
IM-62S 3-1
Chapter 3 Operation
Using the FastFlo Electronics Basic Features
Three push buttons allow selection and adjustment of the basic user func-
tions. Use the push buttons to enter:
•alarm parameters
•change the user full scale
•adjust the K-factor
•adjust the time response speed
•reset the totalizer
You may view parameters using the optional LCD front panel display or
by selecting functions on the single-digit LED and viewing the meter’s 0-5
VDC output with a digital voltmeter (DVM).
Before making changes or adjustments:
For meters with the optional LCD display, remove the enclosure cover to
access the FastFlo electronics. Press the FUNCTION key to view and
record the factory settings. When pressing FUNCTION the optional LCD
display prompts for a password, press FUNCTION again to skip the pass-
word and review the current settings. (To make changes, at the password
prompt press the UP arrow until 11 is displayed, press FUNCTION to con-
tinue.)
For flow meters without the display, remove the enclosure cover to access
the FastFlo electronics. Connect the DVM as described on the following
pages and record the factory-set parameters.
After 12 seconds of non-activity during programming, the meter returns
to the Run Mode with any new settings immediately in effect. For units
without a LCD front panel display: if the unit “times-out” when entering a
new parameter, press the FUNCTION button only to resume adjust-
ments.
Smart electronics dev ice located inside the f low meter enclosure.
Remov e the cov er to enter parameters using the dev ice buttons.
Single digit LED
FUNCTION
UP
DOWN
Figure 3-1. Display/Keypad Commands
Caution!
Before making any ad-
justment to the FastFlo
electronics device, verify
the flow meter is not ac-
tively monitoring or report-
ing to any master control
system. Any adjustment
to the electronics will
cause direct changes to
flow control settings.