V-tech VTHM-205 User manual

Model : VTHM-205
Make : V-Tech
Product : TURBINE FLOW METER MANUAL
Usage Catalogue
TURBINE FLOW METER MANUAL

I. Summary
Turbine flow meter control panel adopts Modular design, Computer modules
are local shows, it is full-featured and easy-to-use with Simple structure and
clear interface.
For this manual, we have introductions about the way for jumper settings and the use of buttons
Please read this manual carefully and operate the control panel accordingly.
II. Features of control panel and wiring
1. Summary
Flow meter adopts low-power CPU core, Turbine sensor signal generated by the
amplified pulse is conveyed to the CPU in, CPU operation in accordance with the flow
coefficient value will flow to a 5 digits on LCD display, LCD reading
range of 0.01 ~ 99999.
In addition to the normal work flow meter flow measurement of liquids, but also can
automatically Factory flow coefficient (k) and user manual calibration of the flow
coefficient (k) calibration
2. Functions as below
Two cumulate (which can be reset TTL1 cumulate Clear, TTL2 the total
accumulation can not clear zero), it can be shifted by the buttons
Unit selection: The selection buttons to operate the flow units: liters and
gallons (U.S.).
Sensor pulse frequency range: 5Hz ~ 5000Hz
Low power consumption: Two pieces of R03(UM-4) 1.5V Common Batteries
(can be used for 2 years)
Factory automatically flow coefficient (k) calibration, the user manual flow
coefficient (k) calibration
3．Performance and technical parameters
Power supply: Two pieces of R03(UM-4) 1.5V Common Batteries
Measurement accuracy: 1%
LCD display: shows the current flow value, calibration and fault code code
manually when the flow calibration factor (k) value
Operating temperature range: -10 ~ +60
4．Jumper definition and connection
Jumper J2: Choice between normal working status and automatic
flow calibration status Factory

III. Functions and operating instructions
Figure 1
Buttons' operation, LCD display to indicate their location (see Figure 1)
1. Normal work status and operations
A. Buttons' operation
To press " DISPLAY " shortly can shift current cumulativeTTL1 and total
cumulativeTTL2, When TTL1 displayed, hold down the "DISPLAY button" about
2 seconds, cumulative flowrate of TTL1 can be cleared "0", while TTL2 can not.
To press " CALIBRATE " can shift the unit LTR and GAL, and the corresponding
characters will be showed on the LCD display
To press "DISPLAY" and "CALIBRATE" at the same time about 2 seconds will
enter the user manual flow coefficient (k) calibration status.
B. LCD Description:
TTL1: current flow can be cumulative in which can be cleared zero;
TTL2: current flow displayed is total cumulative in which can not be cleared zero,
to clear TTL2 flow for zero, take the batteries from the body and install again.
LTR: flow unit
GAL: flow unit (U.S. GAL)
Figure: five field characters, used to display the flow value of calibration
coefficient (k) value and the error symbols
2. Work and dormancy status
When the panel works normally,
The liquid flows through or to operate the buttons, the control panel
LCD shows work status;
No liquid flows through or to operate the buttons, one minute later the control
panel will be in dormancy status, LCD does not display;
The liquid flows through or to operate the buttons, the control panel LCD will
display, the control panel will be waken up and normal working status restored.

3. Calibration work status
Note: only in the unit LTR for calibration
Factory calibration automatically, please follow these steps:
Batteries are not installed on the body, then a short circuit board jumpers J2,
after the installation of batteries, it will display 00000 , in which means it has been
entered into the calibration status, install the control panel to the shell.
When 100 liters of calibration liquid flows at the control pipeline, the flow value
of the flowed liquid will be displayed on LCD screen. The liquid flows out, about
30 seconds, control panel will record the flow value, calculate the flow
coefficient (k) values and deposited CPU of the permanent preservation of
non-volatile memory, even removed the battery discharge coefficient (k) will not
lose value. If the flow of calibration error over more than the limited 10%, the
panel will consider the current calibration value is invalid, and will not record the
current calibration value, the screen will show the letters Err, and then show
the figure 00000, re-entry into the auto-calibration status.
If the calibration successful, still want to re-calibration, please remove
the batteries, repeat the above steps.
Automatic calibration is completed, please remove the battery, then disconnect
the circuit board jumper J2, then the battery can be fitted into the normal
working status
User manual calibration by following these steps:
To press "DISPLAY" and "CALIBRATE" button about 2 seconds at the same time
will enter the user manual flow coefficient (k) calibration status, such as: k = 46.33,
at this time LCD display information in Figure 2.
C46.33
Figure 2
Numerical after "c" ( such as 46.33 ) is the modified flow coefficient (k) value, the
number of flashes that can be modified, and modify the scope: 0 to 9, the position
can be shifted by press the "CALIBRATE" button shortly
To press " DISPLAY" shortly can increase the numerical from 0 to 9, increase only ,
can not reduce.
After modification, press "DISPLAY" and "CALIBRATE" buttons simultaneously,
it can return to normal working status.
User manual flow coefficient (k) calibration correction formula
When the user found that the actual traffic flowed liquid flow has a larger error with
displayed flow, using the following formula to re-calculated k value

measures the value L＝100 LTR, current k value ( not to amend before )
0
k=40, Calculated as follows
0
I = K0
L0
K=
Users to manually modify the k value, for example
Clear "0" TTL1 value or remove the batteries, to clear TTL1, TTL2 "0", fitted with
batteries, button is shifted to TTL1 status, start the measurement of liquid flow,
the flowed liquid enters into the standard cylinder. Record the displayed flow
value and graduated cylinder flow value after the liquid flows out, such as
displayed flow l=95.56 LTR, graduated cylinder
Note：
l= flow rate of flow meter
k= current flow（not to amend before）k value
0
L＝user graduated cylinder measures the value
0
95.56x40
100
K= 38.224
As it only keeps the 2 numerical after two decimal, k＝38.22, to modify k value
to 38.22 is okay
IV. Maintenance
The computerized electronic meters can work at least 9,000 hours (one year) as
the battery power. In most cases, the batteries are required to be replaced for one
year. Prior to the demolition of the battery on sealed meter will extend batteries life.
If the meter readings are dim or blanking, the battery should be replaced. PLS use
batteries for Replacement from your distributor or factory.
When the batteries are disconnected or damaged, circuits in batches and the total
cumulative return to zero. Factory on-site check at the time still without power
at the instrument computer.
I strongly recommend checking the batteries and electrodes cleansing routine
should be used as part of the process of maintenance. Battery electrode should
be inspected once a year. No need to remove the instrument from the pipeline
system, the batteries can be replaced .

V. Batteries replacement
Remove the four angle screws from the instrument's control panel, take the
computerized electronic instruments ( LCD screen ) from the turbine flow
Take out the batteries
Check battery electrode, if rust, and clear it.
Install new batteries, to ensure that the batteries are installed correctly, after
the installation of the batteries, the the computer will be opened automatically,
and display the reading information.
Install the electronic instrument ( LCD screen ) on the turbine flow meter,
ensure that the O-ring is installed to right place. tighten the four screws
It is prohibited to use isopropyl alcohol to clean the external computer assembly.
VI. Assembly drawing
Ⅶ.Fault resolution

IMPORTERS & EXPORTERS OF HIGH PRECISION INSTRUMENTS