EMS WT Series User manual

WT 2020 F1.0 2020/04
WT-Series
Operation & Installation Manual

TH 2020 F1.0 2020/04
INDEX
1. Woltmann Water Meter..................................................................1
1.1. Basic Safety Recommendations................................................1
1.2. Materials and Construction of Water Meter..............................1
1.3. Mechanism of Woltmann Water Meter.....................................2
1.4. Introduction of Woltmann Water Meter....................................3
2. Technical Data.................................................................................4
2.1. Approved Meter Data...............................................................4
2.2. Metrological Data.....................................................................4
2.3. Head Loss.................................................................................5
2.4. Dimension................................................................................6
2.5. Accuracy...................................................................................7
2.6. Materials...................................................................................8
2.7. The Calculator..........................................................................8
3. Electronic Register........................................................................10
3.1. Introduction of Display Functions..........................................10
3.2. Intelligent Display Structure...................................................12
4. Installation.....................................................................................22
4.1. Installation Precautions...........................................................22
4.2. Installation Requirements.......................................................22
5. Maintenance ..................................................................................26

Page 1
1. Woltmann Water Meter Description
1.1. Basic Safety Recommendations
Before installing or using this product, please read this instruction manual thoroughly.
Only qualified personnel shall install and/or repair this product. If a fault appears, please
contact your distributor.
The water meters are constructed according to state-of-the-art technology and tested
operationally reliable. They have left the factory in a faultless condition concerning safety
regulations.
1.2. Materials and Construction of Water Meters
WT-Series, Electronic Woltmann water meter, is manufactured from materials of
adequate strength and durability. The design and the manufacturing materials have been
selected to withstand the MID (2014/32/EU) and OIML (R 49:2013) requirements. All used
materials are not adversely affected by the water temperature variations, within the working
temperature range.
Ambient temperature range +5 °C to +55 °C.
Water temperature range T30
Ambient relative humidity range
0 % to 100 %, except for remote
indicating devices where the range shall
be 0 % to 93 %.
【Table 1: Temperature & Humidity Range】
WT-Series is fitted with a metrological controlled display. The display, the calculator, is
readily accessible to the customer, without requiring the use of any tool. All parts of the
water meter, in contact with the flowing water, are manufactured from materials which are
conventionally known to be non-toxic, non-contaminating, and biologically inert.
The complete water meter, material of water meter body and material of another
component, is manufactured from materials which are resistant to internal and external
corrosion or which are protected by a suitable surface treatment. The plastic material
components and for brass body of water meter are manufactured from materials which are
conventionally known to be non-toxic, non-contaminating and biologically inert. The
indicating device of the water meter is protected by a transparent window with the suitable
cover provided as additional protection for the indicating device. In order to prevent and
eliminate the condensation, the desiccants are provided on the underside of the window of a
water meter indicting device.

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WT-Series is also equipped with sealing, which is used to prevent physical damages of
the water meter, so as not to facilitate the perpetration of fraud. The sealing is provided
before every water meter is ready to be used and installed. This is used to guarantee that the
metrological parameters will not be changed. If the sealing is damaged, it means that the
water meter data is not valid and illegal events have happened.
Last but not the least, every design, composition, and construction of WT-Series water
meter dose not exploit the MPE or favor any party.
1.3. Mechanism of Woltmann Water Meter
【Picture 1: Mechanical Structure】
1. Meter Cover
2. Communication connection
3. Body
4. Flow Straightener
5. Impeller
6. Bearing body
7. Cover
8. Epoxy Coated Cover
1
8
2
7
3
4
5
6

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1.4. Introduction of Woltmann Water Meter
WT-Series is a Woltmann-type water meter designed for measuring bulk flows of cold
potable water for revenue billing in commercial or industrial applications and distribution
system monitoring. WT-Series is manufactured from the highest quality materials for
maximum resistance to wear and corrosion. It features low starting flow rate, large turn
down ratio, stable measurements, low head loss, easy maintenance and installation. The
water meter has been produced according to standard EN 14154. The meter, designed to
measure the water consumption, has been proved a long-term reliable and accurate water
meter. WT-Series can provide management information to assist with effective distribution
management, reduce water losses from leakage and improve customer service. The
measuring principle of WT-Series water meter is as follows:
As water flows through the inlet of the flow straightener, the impeller bearing will push
the impeller to rotate. The impeller bearing is equipped with permanent magnets. The water
meter has sensing components which can detect the rotation and send signals to the
electronic register. The electronic register will receive the magnetic signals and then
transform the magnetic signals into flow rates. All flow rate data can be shown on the
electronic register.
【Picture 2: Measuring Principle】
Flow Direction

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2. Technical Data
Woltmann Water Meter is manufactured in compliance with international standard. Please
confirm that the consumption is within the scope of following flow rate to ensure the
lifespan of water meter. In addition, please familiarize yourself with product technical
specifications prior to installing WT-Series water meter, such as CMD, water quality,
installation environment, etc.
2.1. Approved Meter Data
EU directives MID (2014/32/EU)
Standard OIML (R 49:2013)
Mechanical environment class M1
Electromagnetic class E1
Accuracy class 2
Environmental Class O
Climatic class +5 °C to +55 °C.
Temp. of medium in flow sensor 0.1°…30° Cold water meter
2.2. Metrological Data
DN (mm)/
Inch Unit
50/
(2”)
80/
(3”)
100/
(4”)
150/
(6”)
200/
(8”)
250/
(10”)
300/
(12”)
Q1 (m3/h) m3/h 0.156 0.394 0.625 1.56 2.5 3.938 6.25
Q2 (m3/h) m3/h 0.25 0.63 1.0 2.5 4.0 6.3 10
Q3 (m3/h) m3/h 25 63 100 250 400 630 1000
Q4 (m3/h) m3/h 31.25 78.75 125 313 500 787.5 1250
Ratio Q3/Q1 - 160
Ratio R2/Q1 - 1.6
Flange connection - JIS 7.5K
Construction length L
mm 200 200 250 300 350 450 500
Installation
orientation - H
Temperature Class - T30
Water temperature
range °C 0.1 to 30

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【Table 2: ISO-4064: 2014 Metrological Performance】
2.3. Head Loss
【Picture 3：Head Loss Curve】
Max. working
pressure Pmax bar 16
Max. pressure loss bar 0.4
Protection Degree - IP68
Maximum permissible
error in upper flowrates
range Q2  Q  Q4% ±2
Maximum permissible
error in lower flowrates
range Q
1
 Q < Q
2
% ±5
Scale interval m30.0001 0.001 0.001 0.001 0.001 0.01 0.01
Capacity of calculator m399999.9999 999999.999 999999.999 999999.999 999999.999 9999999.99 9999999.99
Indicating device
- Digital
Units displayed - m3
Battery V 3.67 V
Battery life Years 8 Years
Mechanic class - M1
Climatic class °C 5 to 55
Electromagnetic class - E1 (light industry)

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2.4 Dimension
Unit : mm
【Table 3: Dimensions】
Unit：mm
【Picture 4：Dimension Diagram】
DN
(mm)
Length
（L5）
Width
（D21）
Flange
Center
Range
(D1 1)
From Bottom
to Flange
Center
(H1)
From Cover
to Flange
Center
(H2)
Flange
Hole
Diameter(d
)
Hole
Numb
er
(n)
Approx.
Weight
(kg)
50 200 185 143 92.5 202.5 19 4 18.5
80 200 210 168 99 210 19 4 18.2
100 250 238 195 108 211 19 4 22.8
150 300 290 247 136 248 19 6 29
200 350 342 299 163 248 19 8 53
250 450 410 360 190 335 23 8 80
300 500 464 414 222 335 23 10 107

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2.5. Accuracy
WT-Series is designed and manufactured in a way that its errors (of indication) do not
exceed the maximum permissible errors (MPEs), which is based on accuracy class 2 water
meters. Equipped with electronic devices, WT-Series is designed and manufactured in a
way that significant faults do not occur when it is exposed to the disturbance specified in
Performance tests and tests involving the electronic part of a water meter or its devices,
according to OIML (R 49:2013).
The MPE for the upper flow rate zone (Q2 ≤ Q ≤ Q4) is ±2 %, for temperatures from
0.1°C to 30 °C, and ±3 % for temperatures greater than 30 °C.
The MPE for the lower flow rate zone (Q1 ≤ Q < Q2) is ±5 % regardless of the
temperature range.
【Picture 5：Error Chart】
2.5.1. Reverse flow
WT-Series is not designed to measure reverse flow, and the volume passed during
reverse flow will be subtracted from the indicated volume and the water meter will
record forward flow and reverse flow separately. In addition, the water meter will
withstand accidental flow at a flow rate up to Q3 without deterioration or change its
metrological properties for forward flow.

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2.6. Materials
【Table 4: Materials】
2.7. The Calculator
2.7.1. Interfaces
The calculator will be provided with interfaces based on the requests. When the
interfaces are used, the hardware and software of a water meter will continue to function
correctly and the metrological functions of the meter will not be affected.
2.7.2. Indicating device
The indicated volume is given by a line of adjacent digits appearing in one or more
apertures. The advance of a given digits shall be completed while the digit of the next
immediately lower decade changes from 9 to 0. The lowest value decade may have a
continuous movement, the aperture being large enough to permit a digit to be
unambiguously read. The apparent height of the digits is at least 4mm.
The indicating device does not include additional elements for testing and
calibration by other methods.
2.7.3. Verification devices
The indicating device provides means for visual, non-ambiguous verification
testing and calibration through a first element. The visual verification display is
discontinuous movement.
2.7.4. Protection devices
WT-Series includes a protection device being sealed between water meter body and

Page 9
water meter case both before and after correct installation of the water meter. Without
damaging the protection devices, dismantling or modification of the meter, adjustment
device and correction device, are not allowed for avoiding unauthorized manipulation.
【Picture 6：Protection devices】

Page 10
3. Electronic Register
3.1 Introduction of Display Functions
【Picture 8: Electronic Register】
（1）: Magnet Symbol, when you place the magnet on the electronic register, the
magnet symbol will appear on LCD.
（2）Flow Direction: (+) means forward flow, while (-) means reverse flow.
（3）:Moving Indicator, when water runs through the Woltmann Water Meter, the
indicator will flash.
（4）m3/h : Instant Flow Rate, when LCD displays the instant flow rate, the symbol of
「m3/h」will appear. The measurement unit of the instant flow rate is (m3/h).
（5）WT50: WT50 represents the water meter model number.

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（6）H:H symbolizes horizontal installation.
（7）Battery Life 8 years: Built-in 8 years battery life.
（8）EMS :Company logo
（9）U0 D0 : No need for straight pipe section
（10）T30: Meter temperature classes
（11）E1: Severity levels: Residential, commercial and light industrial
（12）M1: Severity levels: For fixed meters installed outdoors
（13）△P 40 : Pressure-loss classes
（14）DN50 : The diameter of the water meter
（15）R200 : Metrological class, the R ratio (Q3 / Q1) is 200.
（16）Q3 25: Flow point, Q3=25m3/h
（17）: Leak Day(s), when the water meter has been operating for more than 1 day,
LCD will show water drop symbol 「」automatically as follows:
【Table 5: Leak Day(s)】
（18）: Battery Power Shortage Symbol, when the battery voltage is dropping, the
water meter can still operate for 3 months and LCD will display Battery
Symbol at the same time.
（19）Net Totalizer: Large digit means (m3), while small digit means (liter).
（20）MAP16: Water pressure classes: 1.6 MPa.( 16 kg/cm2)
（21）m3 x 0.00001: Unit signs of cubic meter and liter.
（22）The place will be provided on the meter for affixing the verification mark
Operating for more than: Symbols displayed:
1 day 「」
10 days and less than 20 days 「」and 「1」
20 days and less than 30 days 「」and 「2」
30 days and less than 40 days 「」and 「12」
40 days and less than 50 days 「」and 「4」
50 days and less than 60 days 「」and 「14」
60 days and less than 70 days 「」and 「24」
Above 70 days 「」and 「124」

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3.2. Intelligent Display Structure
The electronic register has 6 function modes: Net Totalizer, Forward Totalizer, Reverse
Totalizer, Flow Rate, Management functions and Recording Modes.
Place a magnet on EMS symbol of the electronic register, and then remove the magnet
immediately when the magnet symbol appears, at this time, LCD will display 6 function
modes in turn in accordance with Picture 6.
【Picture 9: Flow Chart of Function Modes】
NOTE: If the Woltmann Water Meter has been idled for more than 15 minutes during
function modes of <Forward Totalizer Mode>, <Reverse Totalizer Mode>, <Flow Rate
Mode>, <Management Mode> or <Recording Mode>, LCD will automatically switch back
to <Net Totalizer Mode>.
1.
Net Totalizer
2. Forward Totalizer
3. Reverse Totalizer
4. Flow Rate
5. Management functions
6. Recording modes

Page 13
3.2.1. Net Totalizer
Net Totalizer is measured in metric system (m3). As the totalized volume reaches
the maximum reading, it would restart from 0.
In Totalizer Mode, as the impeller starts to rotate, the Moving Indicator ( ) will
flash; with forward flow the (+) will appear and values will accumulate, while with
reverse flow the (-) will appear and values will be deducted. When the value becomes 0,
the value will turn to 999999999 and then decrease again.
【Picture 10: Net Totalizer】
3.2.2. Forward Totalizer
Forward Totalizer is displayed in metric system (m3). When the maximum reading
reaches the maximum value, the reading will re-start from 0.
In Forward Totalizer Mode, the forward flow symbol (+) flashes twice per second.
When the impeller starts to rotate, the Moving Indicator ( ) will flash. When the
water is moving forward, the values will accumulate; when the water is moving
reversely, the values will stay the same.
【Picture 11: Forward Totalizer】

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3.2.3. Reverse Totalizer
Reverse Totalizer is displayed in metric system (m3). When the maximum reading
reaches the maximum value, the reading will re-start from 0.
In Reverse Totalizer Mode, the reverse flow symbol (-) flashes twice per second.
When the impeller starts to rotate, the Moving Indicator ( ) will flash. When the water
is moving reversely, the value will accumulate; when the water is moving forward, the
values will remain the same.
【Picture 12: Reverse Totalizer】
3.2.4. Flow Rate
The flow rate will be calculated every 6 seconds and displayed in (m3/h).
【Picture 13: Flow Rate】
3.2.5. Management Mode
Generally, a water meter can only display totalizer and instant flow rate. EMS
Woltmann Water Meter is characterized by the management functions. “Management
Functions”, in simple terms, can provide essential management information in water
resource management. In the Management Mode, every function will switch per 4
seconds. The sequence of Management Functions will be shown as follows:

Page 15
【Picture 14: Flow Chart of Management Modes】
（1）LdAy (Leak Days): This indicates how many days water has been flowing through
the water meter (i.e. the water meter operates continuously). Once the water stops
flowing through the water meter, the Leak Days will return to zero automatically.
（2）ndAy (Operation Days): This indicates how many days the water meter has been
★As the above days/times reach to 9999, they would restart from 0000.
Leak Days（0000 - 9999）
Operation Days（0000 - 9999）
Static Days (0000-0000)
Magnetic Interference Days（0000 - 9999）
Battery Power Shortage Days (0000-9999)
Valve Switch Times (0000-9999)
Overload Times（0000 - 9999）
Reverse Days（0000 - 9999）
Time (Hour/ Min/ Sec)
Date (Year/ Mon/Day)
Authorization Number
Authorization Date

Page 16
operating. When water stops flowing through the water meter, the accumulated value
will not turn to 0; when water starts to flow through the water meter again, the
accumulation will resume.
（3）OdAy (Static Days): This indicates how many days water has stopped flowing
through the water meter. When water starts to flow through the water meter again,
the accumulation will not turn to 0. When water stops flowing through the water
meter again, the accumulation will resume.
（4）UdAy (Reverse Days): This indicates how many days water has been flowing
through the water meter reversely. When water stops flowing, the accumulation will
not turn to 0. When water starts flowing through water meter again, the accumulation
will resume.
（5）HdAy (Magnetic Interference Days): This indicates how many days the water
meter has been interfered by a magnet. The accumulation will not turn to 0 when the
magnetic interference has been removed. When the magnetic interference occurs
again, the accumulation will resume.
（6）bdAy (Battery Power Shortage Days): When the battery voltage is dropping (low
power), LCD will display Battery Symbol and the low battery days will be recorded.
（7）1234 F: Valve Switch Times: When the water starts flowing through the water meter
and then stops flowing through the water meter, the valve switch times will add 1
time. The valve switch times will be accumulated up to 9,999 times and then restart
from 0.
（8）E-1234:Overload Times: When the average value of the instant flow rate is higher
than Qmax (Overload flow rate), the Overload Times will add 1 time. The Overload
Times will be accumulated up to 9,999 times and then restart from 0.
（9）17_32_56: Time: Electronic register will display current time.
（10）19_10_03: Date: Electronic register will display current date.
（11）An-006156: Authorization Number,
representing the authorized staff in charge
for calibration.
（12）Ad-191001: Authorization Date, the date of the authorized calibration.

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3.2.4. Recording Mode
The recording mode includes Leak Logs, Magnetic Interference Logs, Totalizer
Logs, and Overload Flow-Rate Ranking.
【Picture 15: Flow Chart of Recording Mode】
Leak Logs （last 3 logs）
Totalizer Logs (last 7 logs)
Overload Flow Rate Ranking ( Top 5 logs）
Magnetic Interference Logs（last 3 logs）

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（1）Leak Logs: It records the latest 3 leak events, including total number of Leak Days
and leak date/time/duration of the last 3 leak events.
【Picture16: Leak logs Flow Chart】
Leak Logs
Leak Days
Serial No.
Start Date
(Y/M/D)
Start Time
(H/M)
Leak
Duration
(H/M)