RWT ENV120 Series User manual

ENV120 Series
SLUDGE BLANKET
LEVEL METER

ENV120 Sludge Blanket Monitoring System REV4.0
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SAFETY
PRECAUTIONS
The ENV120 product is intended for use by qualified personnel
who recognize shock hazards and are familiar with the safety
precautions required to avoid possible injury. Read the operating
information carefully before using the product.
Users of this product must be protected from electric shock at all
times. Product users must be trained to protect themselves from the
risk of electric shock.
Before operating the instrument, make sure the mains supply is
connected to a properly grounded power supply. Periodically inspect
the connecting cables for possible wear, cracks, or breaks.
The fuse may only be replaced with same type and rating for
continued protection against fire hazard.
In addition to information on installation and operation, this
instruction manual may contain WARNINGS pertaining to user
safety, CAUTIONS regarding possible instrument malfunction,
useful operating guidelines.
WARNING
A Warning looks like this. Its purpose is to warn
you of the potential for personal injury
CAUTION
A Caution looks like this. Its purpose is to alert
you to important operating information
Definition of Equipment Symbols
This symbol means CAUTION and alerts you to
possible danger or instrument malfunction. Refer to
this manual before proceeding.
This symbol means that this is a protective ground
terminal and alerts you to connect an earth ground to it.

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WARRANTY WESS Global, Inc. warrants the ultrasonic sludge blanket monitoring
system, ENV120, to be free from defects in material or workmanship
for a period of 1 year (12 months) from the date of this product was
shipped from local distributors. A warranty claim will not be honored
if defects are not reported within the warranty period, or if WESS
Global, Inc. determines that defects or damages are due to normal
wear, misapplication, lack of maintenance, abuse, improper
installation, alternation, or abnormal conditions. WESS’s obligation
under this warranty shall be limited to, at its option, replacement or
repair of this product. The product must be returned to WESS or
WESS’s distribution centers, freight prepaid, for examination. The
product must be thoroughly cleaned and any process chemicals
removed before it will be accepted for replacement or repair. WESS’s
liability shall not exceed the cost of the product. Under no
circumstances will WESS be liable for any incidental or consequential
damages, whether to person or property. WESS will not be liable for
any other loss, damage or expense of any kind, including loss of
profits, resulting from the installation, use, or inability to use this
product.

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TABLE
OF CONTENTS
1. PRODUCT DESCRIPTION…………………………………….5
1.1 OVERVIEW
1.2 PROBE
1.3 CONTROLLER
1.4 CLEANING DEVICE
1.5 SWING BRACKET
2. APPLICATIONS……………………………………………….11
3. INSTALLATION…………………………..………...………....12
3.1 PROBE
3.2 CONTROLLER
3.3 CLEANING DEVICE
3.4 SWING BRACKET
4. POWER,WIRING & CONNECTIONS…..............................21
4.1 POWER REQUIREMENTS
4.2 PROBE WIRING
4.3 USER CONNECTIONS......... 4.3.1 PROBE CONNECTION
4.3.2 SERIAL CONNECTION
4.3.3 ANALOG OUTPUT
4.3.4 RELAY OUTPUT
4.3.5 CLEANING DEVICE
4.3.6 POWER CONEECTION
5. SCREENS ................................................................................30
5.1 NUMERIC SCREEN
5.2 ECHO SCREEN
5.3 PARAMETER SCREEN
5.4 DATA TREND SCREEN
5.5 SCREEN SWITCHING
6. MENU SYSTEM…………………………................................37
6.1 BASIC KEY OPERATION
6.2 OVERVIEW OF MENU SYSTEM
6.3 SYSTEM MENU OPTIONS
6.4 RELAY MENU OPTIONS
6.5 DATA LOGGING MENU OPTIONS
6.6 COMPLEMENT MENU OPTIONS
7. RS232/485………………………………………………………51
8. SYSTEM REPAIR AND RETURN…………………………..52

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1.
PRODUCT
DESCRIPTION
1.1
OVERVIEW
ENV120 series is a non-contacting ultrasonic instrument that
measures the sludge blanket in series liquid. It consists of a probe and
a firmware-driven controller. The firmware controls the ultrasonic
probe and analyzes signals sent from the ultrasonic probe. (See Fig. 1)
ENV120 Features:
Continuous measurement
Visual Threshold Adjustment(VTA)
10,000 points data logging & trend mode
ASF(Abnormal Signal Filter) Function
Built-in probe cleaning nozzle
swing bracket for skimmer avoidance
Fig.1 Configuration of the ENV120

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1.
PRODUCT
DESCRIPTION
1.2
PROBE(S1T)
The Fig.2 is an illustration of the ultrasonic probe S1T.
Fig.2 Probe(S1T)
Specifications
Material Body: PP
Ultrasonic Head: PP
Mounting Thread 3/4” PF thread
Cable Length 10m or 33ft (STD.)
Extendable to max. 100m
Opera. Temp. -10 to 60°C (14 to 140°F)
Dimensions Φ 88mm x 121(H)mm
Weight 1.2 kg (inc. 10m cable)
IP Rating IP68
Cleaning Method Air Jet (built-in cleaning nozzle)
Connection with Optional Cleaning Device
One-Touch fitting for Φ6 tube

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1.
PRODUCT
DESCRIPTION
1.2
PROBE(S1G)
The Fig.3 is an illustration of the ultrasonic probe S1G.
Fig.3 Probe(S1G)
Specifications
Material Body: STS304, STS316(Option)
Ultrasonic Head: Epoxy
Mounting Thread 3/4” PF male thread
Cable Length 10m or 33ft (STD.)
Extendable to max. 100m
Oper. Temp. -10 to 60°C (14 to 140°F)
Dimensions Φ 76mm x 83(H)mm
Weight 2.2 kg (inc. 10m cable)
IP Rating IP68
Cleaning Method Air Jet (built-in cleaning nozzle)
Connection with Optional Cleaning Device
One-Touch fitting for Φ6 tube

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1.
PRODUCT
DESCRIPTION
1.3
CONTROLLER
Fig.4 illustrates the controller
Fig.4 Controller
Specifications
Range 0.35 to 30m (1 to 33ft)
Resolution 1cm (metric), 0.1ft (imperial)
Accuracy ±0.5% of measured range or 1 inch,
whichever is greater
Oper. Temp. -20 to 70°C (-4 to 158°F)
Outputs Current: 4 to 20mA, nom. load 250Ω
(Load range: 100 to 750Ω)
Relay: 3 SPDT (5A, 250VAC)– “ER” “R1” “R2”
Digital: RS232 or 485(option)
Power supply STD.: 100 to 240V AC, 50 to 60Hz, <15W
OPT.: 24V DC
Fuse T315mAL 250V 5 x 20mm
Casing Body/Cover: ABS
Dimensions 252(W) x 238(H) x 125(D) mm
Mounting Center hole 205(W) x 190(H) (Φ 6 x 4ea)
Weight 2.2 kg
IP Rating IP67

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1.
PRODUCT
DESCRIPTION
1.3
CONTROLLER
1.4
CLEANING DEVICE
Max Altitude 2,000 m
Max Humidity 80% (31℃)
50% (40°C ~ 60℃)
Installation Category II – IEC644
Pollution Degree 2 – IEC644
CE EMC Complies with EN61326 (Class A)
EN61000, EN61010-1:2001
Fig.5 Cleaning Device
Specifications
Free Flow Rate 25L/min
Max Pressure 4.5bar
Oper. Temp. -10 ~ 60°C (14~ 140°F)
Power supply
STD.: 220V AC ±10%, 50~60Hz, ≤50W
OPT.: 110V AC ±10%, 50~60Hz
Casing ABS
Dimension 190(W) x 190(H) x 130(D) mm
Mounting Center hole 155(W) x 100(H) (M5 x 4ea)
Weight 2 kg
IP Rating IP66

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1.
PRODUCT
DESCRIPTION
1.5
SWING BRACKET
Fig.6 Swing bracket
Specifications
Material Probe Protector: STS 304
Probe Mounting Pipe: STS 304
Mounting Thread 3/4” PF male thread
(Probe/user supply pipe)
Damper Buffer
Dimensions Damper : 85(W) x 100(H)
Swing Bracket : 70(W) x 375(H)
Weight Damper : 0.75 kg
Swing Bracket : 0.40 kg

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2.
APPLICATIONS The ENV120 is designed to monitor the levels of solid contents
(sludge) in various types of liquids (water, liquor, etc.), to control the
pumps engaged in the processes, and to initiate events based on
measured process conditions.
Some applications examples include:
Water & wastewater treatment clarifiers
Water & wastewater gravity & DAF thickeners
Raw water clarifiers
Sumps, lagoons, settling ponds
Industrial process thickeners
Salt brine tanks
Material inventory tanks
Process thickeners

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3.
INSTALLATION
3.1
PROBE
Do not inflict impact or unnecessary external force on the probe
during handling. The ultrasonic head (see Fig .7), which transmits and
receives sound waves, should be handled with extra care and stored
wrapped in sponge or other soft materials to absorb the impact of an
external blow.
Fig.7 Ultrasonic head
Attach and secure the probe using the 3/4” PF male thread located on
the upper section of the probe. Pipe length selection should be based
on the lowest liquid level (see Fig.7). The pipe's material should be
chosen in consideration for material strength or application fluid
characteristics. STS 304 20A, 10S pipe is the preferred choice in most
applications. The cleaning air supply tube connects to the probe’s one-
touch fitting only if the cleaning device is used. The schematic
diagram used for the installation process is identical to Fig.8 and can
be modified according installation site requirements.
Position the probe at a location where the ultrasonic signal from the
bottom of the pool or tank is not blocked by surrounding structures
(agitator, pipe, etc.). Additionally, to ensure stable measurement, the
probe should be positioned away from air bubbles and active floating
solids resulting from sudden changes in velocity

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3.
INSTALLATION
3.1
PROBE
Refer to the Fig.8 to decide the depth of probe installation
Fig.8 Stationary Installation of the Probe
Fig.9 Probe Installation Structure (an example)

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3.
INSTALLATION
3.1
PROBE
For tank or rectangular pool applications, maintain at least 1m of
separation distance from the wall to minimize interference (see Fig.10
and Fig.11) and try to avoid a hopper area where the shape of sludge
blanket varies upon pumping activity(see Fig.11)
Fig.10 Minimum Separation Distance of Circular Clarifier
Fig.11 Minimum Separation Distance of Rectangular Clarifier

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3.
INSTALLATION
3.2
CONTROLLER
Protect the controller from impact and unnecessary external force
until it is installed.
Install the controller on a panel/handrail or wall using the mounting
holes (Φ 6) located at the back of controller (see Fig.12). Schematic
diagram for U-bolt installation on a handrail is illustrated in Fig.13.
Fig.12 Mounting Hole Position (Φ6 x 4ea)
Fig.13 Handrail Installation Example

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3.
INSTALLATION
3.2
CONTROLLER
Located on the bottom of the controller are four cable glands the user
can use selectively for his/her specific application (see Fig.14). Each
cable gland should be connected using a cable of correct diameter (Φ
4.5 ~ 10mm) to ensure IP67
Most products generally use the direct cable connection method, in
which stripped wires connect directly to a terminal block (TB). This
makes for a difficult wiring process because of the sheer number of
wires in a confined space.
ENV120, on the other hand, utilizes a new wiring method that uses
an additional plug connector for the primary wiring and then it
connects to TB stationed on PCB. For detailed information, refer to
Chapter 4.
Fig.14 General Usage of Cable Distribution
WARNING
To avoid the risk of electric shock, this
equipment must only be connected to a main
supply with protective earth.

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3.
INSTALLATION
3.3
CLEANING DEVICE
(OPTIONAL)
Use the female thread (M5) located at the rear to install the cleaning
device on a panel/handrail (see Fig.15).
Normally the cleaning device installs horizontally against the
controller. Fig.16 illustrates a typical application using U-bolts.
Fig.15 Locations of Female Threads (M5 x 4ea)
Fig.16 Handrail Mounting Example

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3.
INSTALLATION
3.3
CLEANING DEVICE
Fig.17 illustrates the connection between the cleaning device and the
probe / controller. Refer to Chapter 4 for detailed information of this
electrical connection.
Fig.17 connecting to enable the Cleaning Device

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3.
INSTALLATION
3.4
SWING BRACKET
(OPTIONAL)
The swing bracket is used to protect the probe from damage caused
by skimmer/scraper that exists at circular or rectangular clarifiers of
the sewage treatment plant.
ENV120’s swing bracket features a hinge damper that dampens the
skimmer's impact during pendulum motions.
To connect the swing bracket to a probe, link the probe’s 3/4” PF
thread to the cleaning device’s 3/4” PF socket (see Fig.18). Consider
the distance from the probe head to the skimmer when preparing the
20A, 10S STS pipe with a 3/4” male thread.
Fig.19 (Circular Clarifier) and Fig.20 (Rectangular Clarifier) are
typical sewage plant applications.
Fig.18 Swing Bracket + Probe

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3.
INSTALLATION
3.4
SWING BRACKET
Fig. 19 Typical Circular Clarifier Installation
Fig. 20 Typical Rectangular Clarifier Installation
CAUTION
Take care not to damage a damper and a sensor
protector by checking a surface skimmer’s
direction