Omega FDT-25 User manual

TM
User’s Guide
Shop online at
e-mail: [email protected]
For latest product manuals:
omega.com/en-us/pdf-manuals
omega.com
omega.com/en-us/pdf-manuals
FDT-25
Ultrasonic Flowmeter

Servicing North America:
U.S.A. Omega Engineering, Inc.
Headquarters: 800 Connecticut Ave. Suite 5N01, Norwalk, CT 06854
Toll-Free: 1-800-826-6342 (USA & Canada only)
Customer Service: 1-800-622-2378 (USA & Canada only)
Engineering Service: 1-800-872-9436 (USA & Canada only)
Tel: [phone] Fax: [phone]
e-mail: [email protected]
omega.com [email protected]
The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and
reserves the right to alter specifications without notice.

FDT-25 Handheld Ultrasonic Flowmeter
Contents
1. Introduction………………………………………………………………………………………… 1
§1.1 Preface………………………………………………………………………..……… 1
§ 1.2 Features…………………………………………………………………………… 1
§ 1.3 PrincipleofMeasurement …………………………………………………………… 2
§1.4 PartsIdentification……………………………………………………………………… 3
§ 1.5 TypicalApplications…………………………………………………………………… 5
§ 1.6 Data Integrity and Built-inTime-Keeper…………………………………………………… 5
§1.7 Product Identification…………………………………………………………………… 6
§1.8 Specifications……………………………………………………………………………6
2. Starting Measurement …………………………………………………………………………… 7
§ 2.1 Built-inBattery…………………………………………………………………………7
§2.2 PowerOn……………………………………………………………………………… 7
§2.3 Keypad …………………………………………………………………………… 8
§ 2.4 MenuWindows………………………………………………………………………… 8
§ 2.5 Menu Windows Arrangement…………………………………………………………9
§ 2.6 Steps to Configure the Parameters …………………………………………………………10
§2.7 TransducersMountingAllocation………………… ………… ……………………………11
§ 2.8 TransducersInstallation ………………………………………………………………12
§ 2.8.1TransducersSpacing………………………………………………………………… 12
§ 2.8.2V-methodInstallation………………………………………………………………… 12
§ 2.8.3 Z-method Installation………………………………………………………………13
§ 2.8.4 W-method Installation……………………………………………………………13
§ 2.8.5 N-method Installation…………………………………………………………… 14
§ 2.9 InstallationCheckup………………………………………………………………… 14
§ 2.9.1 SignalStrength………………………………………………………………… 14
§2.9.2 Signal Quality……………………………………………………………………14
§ 2.9.3 Total Transit Time and Delta Time………………………………………………14
§ 2.9.4TimeRatiobetweentheMeasuredTotalTransitTimeand theCalculatedTime…………15
3. How To…………………………………………………………………………………………… 16
§ 3.1 How tojudgeif theinstrumentworksproperly……………………………………………… 16
§ 3.2 How to judge the liquid flowing direction ……………………………………………… 16
§ 3.3 How to change betweenunits systems…………………………………………………… 16
§ 3.4 How to select a requiredflow rate unit…………………………………………………… 16
§ 3.5 How to use the totalizer multiplier……………………………………………………… 16
§ 3.6 How to open or shut the totalizers……………………………………………………… 16

FDT-25 Handheld Ultrasonic Flowmeter
§ 3.7 How to reset the totalizers……………………………………………………………… 16
§ 3.8 How to restore the flow meter with default setups……………………………………… 17
§3.9 How to use the damper………………………………………………………………… 17
§3.10How to use the zero-cutoff function…………………………………………… 17
§3.11 How to setup a zero point…………………………………………………………… 17
§3.12 How to get a scale factor for calibration……………………………………… 17
§3.13 How to use the operation locker…………………………………………… 17
§3.14 How to use the built-in data logger…………………………………………………… 18
§3.15 How to use the FrequencyOutput… ………………………………………… 18
§3.16How to use the Totalizer Pulse Output………………………………………… 18
§3.17 How to produce an alarm signal……………………………………………………… 19
§3.18 How to use the built-in Buzzer…………………………………………………… 19
§3.19 How to use the OCT output…… ……………………………………………… … 19
§3.20 How to modify the built-in calendar… ………………… ………………… 19
§3.21 How to adjust the LCD contrast…………………………………………… 20
§3.22 How to use the RS232 serial interface……………………………………… 20
§3.23 How to view the Date Totalizers …………………………………………… 20
§3.24 How to use the Working Timer …………………………………………… 20
§3.25 How to use the manual totalizer ……………………………………………… 20
§3.26 How to check the ESN and other minor details………… ……… …………… ……… 20
§3.27 How to know how long the battery will last…………… …………………… ……… 20
§3.28 How to charge the built-in battery…………………………………………………… 20
4. Menu Window Details ……………………………………………………………………… 21
5.Troubleshooting……………………………………………………………………………… 26
§5.1 Power-on Error Displays and Counter-Measures ………………………………… 26
§5.2 Error Code and Counter-Measures …………………………………………… 26
§ 5.3 Other Problems and Solutions …………………………………………… … 27
6. Communication Protocol ……………………………………………………………… …… 29
§ 6. 0 General ………………………………………………………………………… 29
§ 6.1 Interface Pin-out Definition …………………………………………………… 29
§ 6.2 the Protocol…………………………………………………………………… 29
§ 6.3 Protocol Prefix Usage ……………………………………………………… 30
§6.4 Codes for the Keypad ……………………………………………………………… 31

FDT-25 Handheld Ultrasonic Flowmeter 1
§1.1 Preface
1. Introduction
The FDT-25 Series flow meter incorporates the latest ICs manufactured from the famous semiconductor
manufacturers like Philips, Maxim, TI, Winbond, and Xilinx. The hardware features the ease of
operation, high accuracy and outstanding reliability, while the software provides a very user friendly
interface and much more functions. It employs a patent balanced lower voltage multi-pulse igniting
circuit which increases the anti-interference ability magnificently so that the flow meter will work
properly even in demanding industrial environments such as those with power frequency transverter
working nearby.
Other outstanding features:
----the signal receiving circuits feature self-adapting performance so as to ensure that the user can
easily operate the instrument without any adjustment.
----the built-in rechargeable NiMH battery can work continuously for more than 12 hours without
recharge.
The advanced circuit design, the integration of the latest semiconductors, the user-friendly software
interface both in English and Chinese languages and small-sized PCB board, all these features
combine to make the series ultrasonic flow meter the best and the biggest seller on the Chinese
market. Moreover, it is gaining more and more recognition on the international flow meter market
§1.2 Features
* 0.5% of linearity * 0.2% of repeatability
* Bilingual interface in Chinese and English *4 flow totalizers

2 FDT-25 Handheld Ultrasonic Flowmeter
* Patent balanced lower-voltage multi-pulse * built-in date totalizers
ultrasonic igniting * built-in data-logger
* Work properly near transverters * 0.5 second totalizing period
* 100 Pico-second resolution of time measurement
§1.3 Principle of Measurement
The FDT-25 ultrasonic flow meter is designed to measure the fluid velocity of liquid within a closed
conduit. The transducers are a non-contacting, clamp-on type, which will provide benefits of non-
fouling operation and easy installation.
The FDT-25 transit time flow meter utilizes two transducers that function as both ultrasonic
transmitters and receivers. The transducers are clamped on the outside of a closed pipe at a specific
distance from each other. The transducers can be mounted in V-method where the sound transverses
the pipe twice, or W-method where the sound transverses the pipe four times, or in Z-method where
the transducers are mounted on opposite sides of the pipe and the sound crosses the pipe once. This
selection of the mounting method depends on pipe and liquid characteristics. The flow meter operates
by alternately transmitting and receiving a frequency modulated burst of sound energy between the
two transducers and measuring the transit time that it takes for sound to travel between the two
transducers. The difference in the transit time measured is directly and exactly related to the velocity
of the liquid in the pipe, as shown in Figure 1.
Downstream transduc
er
T
up
T
d own
Flow
Where
0 is the include angle to the flow direction
M is the travel times of the ultrasonic beam
D is the pipe diameter
Spacing
Upstream transducer
Tup is the time for the beam from upstream transducer to the downstream one
Tdown is the time for the beam from downstream transducer to the upstream one
ΔT－Tup Tdown

FDT-25 Handheld Ultrasonic Flowmeter 3
§1.4 Parts Identification
Converter:
Topvierw
s
t
r
e
a
m
t
r
a
n
s
d
u
e
r
s
o
c
k
e
t
s
t
r
e
a
m
t
r
a
n
s
d
u
e
r
s
o
c
k
e
t
F
r
o
n
t
v
i
e
w
L
C
D
D
I
S
P
L
A
Y
L
E
D
C
h
a
r
g
i
n
g
I
n
d
i
c
a
t
o
r
K
e
y
p
a
d
Bottom view
PinsforbatteryrechargeRS-232Ccommunication interface
Transducers:
STD-HS Standard Clamp on transducer small, pipe size DN15 to
DN100 (3/4" to 4")

4 FDT-25 Handheld Ultrasonic Flowmeter
Cable5m x2
R
e
d
T
e
r
m
i
n
a
l
5
m
R
e
d
T
e
r
m
i
n
a
l
B
l
u
e
T
e
r
m
i
n
a
l
B
l
u
e
T
e
r
m
i
n
a
l
Extended Cable5m x2(Optional Accessaries)
R
e
d
T
e
r
m
i
n
a
l
5
m
B
l
u
e
T
e
r
m
i
n
a
l
R
e
d
T
e
r
m
i
n
a
l
B
l
u
e
T
e
r
m
i
n
a
l
Converted TerminalandAC/DCAdapter
Cable of RS-232Cinterface
1m

FDT-25 Handheld Ultrasonic Flowmeter 5
§1.5Typical Applications
TheFDT-25flowmetercanbe virtuallyapplied to a wide range of measurements.Themeasured
piperanges 20
-
6000 mm [0.5
-
200 inch].Avarietyof liquid applications canbe accommodated:
ultra-pureliquids, potablewater,chemicals,rawsewage,reclaimed water,coolingwater,riverwater,
plant effluent,etc.Because theinstrument and transducers arenon-contactingandhavenomoving
parts,theflowmetercan not be affected bysystempressure,foulingorwear.Standard transducers
arerated to 110℃.Highertemperatures canbe accommodated.For further infor mation, please
consult themanufacturer forassistance.
§1.6 Data Integrity and Built-in Time-Keeper
All user-inputted configuration values are retained in the built-in non-volatile flash memory that
can store them for over 100 years, even if power is lost or turned off. Password protection is provided
to avoid inadvertent configuration changes or totalizer resets.
A time-keeper is integrated in the flow meter for the index of date totalizing and works as the time
base of flow accumulation. It keeps operating as long as the battery’s terminal voltage is over 1.5V.
In case of battery failure, the time-keeper will not keep running and it will lose proper time values.
The user must re-enter proper time values in case the battery becomes totally exhausted. An improper
time value affects no other functions but the date totalizer.
Optional transducer
STD-HS* Standard Clamp on transducer small, pipe size DN15 to DN100 (3/4” to 4”)
STD-HM Standard Clamp on transducer medium, pipe size DN50 to DN700 (2” to 28”)
STD-HL Standard Clamp on transducer large, pipe size DN300 to DN6000 (12” to 240”)
HT-HS High Temp Clamp on transducer small, pipe size DN15 to DN100 (3/4” to 4”) HT-
HM High Temp Clamp on transducer medium, pipe size DN50 to DN700 (2” to 28”) HT-HL
High Temp Clamp on transducer large, pipe size DN300 to DN6000 (12” to 240”)
* STD-HS provided as standard with FDT-25. Other Transducers sold separately.

6 FDT-25 Handheld Ultrasonic Flowmeter
§1.7 Product Identification
Each set of the FDT-25 Series flow meter has a unique product identification or ESN written into
the software that can only be modified with a special tool by the manufacturer. In case of any hardware
failure, please provide this number which is located on menu window number M61 when contacting
the manufacture.
§1.8 Specifications
Linearity 0.5%
Repeatability 0.2%
Accuracy ±1% of reading at rates>0.2 mps
Response Time 0-999 seconds, user-configurable
Velocity ±32 m/s
Pipe Size 20mm-6000mm
Rate Units
Meter, Feet, Cubic Meter, Liter, Cubic Feet, USA Gallon, Imperial
Gallon, Oil Barrel, USA Liquid Barrel, Imperial Liquid Barrel, Million
USA Gallons. User configurable.
Totalizer 7-digit totals for net, positive and negative flow respectively
Liquid Types Virtually all liquids
Security Setup values Modification Lockout. Access code needs unlocking
Display 4x8 Chinese characters or 4x16 English letters
Communication
Interface
RS-232C, baud-rate: from 75 to 57600. Protocol made by the
manufacturer and compatible with that of the FUJI ultrasonic flow
meter. User protocols can be made on enquiry.
Transducers Model M1 for standard, other 3 models for optional
Transducer Cord Length Standard 2x10 meters, optional 2x 500 meters
Power Supply
3 AAA NiMH built-in batteries. When fully recharged it will last
over 10 hours of operation.
100V-240VAC for the charger
Data Logger Built-in data logger can store over 2000 lines of data
Manual Totalizer 7-digit press-key-to-go totalizer for calibration
Housing Material ABS
Case Size 100x66x20mm
Handset Weight 514g (1.2 lbs) with batteries