Microsensor MPM489WZ3 User manual

MPM489WZ3
Operation Manual

Contents
1 Introduction .................................................................................... 1
2 Specifications ................................................................................. 2
3 Outline Construction and Installation .............................................. 2
4 Electric Connection ........................................................................ 9
5 Unpacking、Components and Storage ......................................... 10
6 Operation、Maintenance and Fault Diagnosis .............................. 11
7 Responsibility ............................................................................... 13
Our company reserves the modification right for this operation manual
due to renovation of production technology and craftwork. If some
information is changed, no more notice will be edited.
Please pay attention to the latest version.
Our company also reserves the right of final explanation for this manual.
Version: V1.0

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Thank you very much for selecting Micro Sensor’s product, please take
some time to read this operation manual very carefully before using the
product.
1 Introduction
MPM489WZ3 Submersible Level Transmitter is a full-sealed submersible
piezoresistive level measurement instrument with compact size. A high
stable and reliable piezoresistive OEM pressure sensing element is
mounted with a special PCB of the transmitter in a stainless steel
housing. The integration construction and the standard output signal
support worksite operation and automatic controlling facilities. The
special cable is connected tightly with the housing and the vent tube is in
the cable. And the cable could be put into the liquid compatible with
construction material of the transmitter for a long term use.
MPM489WZ3 Submersible Level Transmitter has advantages of
compact size, light weight and long-term stability without need of
adjustment; it can be applied for liquid measurement and control in fields
of petroleum, chemi-industry, medicine, metallurgy, power station, mine,
city water supply, drainage and hydrology survey, etc.
The protection class of MPM489WZ3 Submersible Level Transmitter is
IP68.
To be convenient for worksite local installation and observation, the
connection box and indicator could be assembled according to
customers’ option.

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2 Specifications
Pressure Range: 0mH2O ~ 1mH2O…7mH2O
Overpressure: ≤2 times FS
Accuracy: ±1%FS
Stability: ±0.5% FS/ year
Compensated Temp.: 0℃~50℃
Operation temp.: -20℃~70℃
Storage Temp.: -20℃~85℃
Power Supply: 11V~28V DC
Transmitting: 2-wire 3-wire
Output Signal: 4mA~20mA DC 0.5V~4.5V DC
Load (Ω): ≤ (U-11)/0.02（Ω） >100k
Protection Rating: IP68
3 Outline Construction and Installation
3.1 Construction Material Transmitter
Housing: Stainless steel 304 Cap: Nylon
O- ring: Viton Rubber casing: Chloroprene Rubber
Cable: Φ7.5mm PUR cable with vent tube Diaphragm: SS 316L
Connection Box: Cast aluminium (ZL102)/ PBT
3.2 Outline Construction
The outline dimension is showed as Figure 1:

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Unit:mm
Cable length: Customized and the longest is 100m.
Figure 1
3.3 Outline Construction of connection box (Only for the
transmitter of 2-wire, 4mA~20mADC output)(seeing
Figure 2)
Connection box：Please note it in the order when a connection box is
needed.
Indicator: Connection box Ye, we could provide the indicator based on
users’ requirement.
Mounting hole 2-M6
Depth 10
～1 4 0
Φ8 0
Φ8 4
4 0
45
Connection box Yb

4
Connection box Ye
54
12
SW27
10
17
108
85
85
118
35
72
38 16
Connection box Yc
Figure2
3.4 Installation

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3.4.1 Check before Installation
Attention before transmitter installation:
a) The static pressure produced by the liquid at installation place
exceeds the transmitter FS or not.
b) The measuring liquid is compatible with the transmitter construction
material or not.
c) The measuring liquid may jam the holes on the protection cap or not.
3.4.2 Installation Methods
The transmitter should be installed vertically down.
In the flowing water, the acted surface should be parallel with the water
flowing direction.
3.4.2.1 Installation in the Static Water
The installation method in the static water see chart 3.
To prevent shaking or destroying the transmitter when pumping, the
transmitter should be put away from the liquid resource. Otherwise it
should be installed as chart 4, protected by steel tube.
The installation method in the deep well see chart 4.
Steel tube inserted method is usually used. The steel tube cannot be
bent; the inner diameter of steel tube must be more than 30mm. Several
holes should be made at different heights on the tube so as to easily
raising and make water flow smoothly. If necessary, wrap steel wire
around transmitter to prevent breaking the cable by lifting with the steel

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wire.
sediment
El e c t ni c a l C on n e c t i o n B o x
Control Room
F i x e d Mo u n t
Chart 3
Electnical Connection Box
Fastener
Control Room
Chart 4

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3.4.2.2 Installation in Flowing Water (e.g. river channel,
reservoir area,etc.)
The water-calming equipment are required.
Method one: Insert a steel tube in the water channel (see chart 5).
The steel tube wall should be thicker, and several holes should be made
at different heights on the tube to damp waves and clear the water
pressure influence.
Method two: Superficial burying is better in the sand and stone channel
(see chart 6).
Electnical Connection Box
Chart 5

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ELectnical Connection Box
Chart 6
Method three: see chart 7.
This method can not only clear water flowing pressure and wave
influence, but also filter the sand and mud.
Chart 7
Damper
Air Pocket

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4 Electric Connection
Cable connection:
Current output:
Voltage output:
The electronic connection method of transmitter with connection box:
There is a terminal connection board in transmitter connection box, and
the terminal definitions are indicated below.
OV/+OUT
+V
Wire Color Definition
Red +V
Black 0V/+OUT
Wire Color Definition
Red +V
Black GND
White +OUT
Blue( Only with temperature type) TEMP(+)
Brown( Only with temperature type) TEMP(-)
Green( Only with temperature type) DRAIN

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The Reference Tube Installation
a) There is a plastic tube in the transmitter special cable; the back
pressure cavity of gauge sensor is connected to atmosphere by this
tube. In the process of installation and operation, be sure to keep the
reference tube be well connected with the atmosphere. Mud or sand
should not be jammed into the reference tube. Prevent water or
other liquid going through the reference tube to destroy the
transmitter.
b) If the product is installed in “lightning and thunder” area, please note
“lightning-proof” in the order. We suggest to install a Lightning-proof
Protection Device to protect transmitter.
5 Unpacking、Components and Storage
5.1 Unpacking
Attention:
a) Check the package completed or not firstly, and the box should be
put as the sign “up”.
b) Avoid knocking violently when opening, and prevent injuring
instruments or accessory. Please be carefully to prevent the housing
and rubber casing of transmitter cable from damage.
5.2 Enclosed
When out-factory, the transmitter includes:

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MPM489WZ3 Submersible Level Transmitter 1
PUR Special Cable(connected with transmitter) the ordered length
Connection Box（connected with cable） due to the order
Indicator（in connection box Ye） due to the order
Product Operation Manual 1
Product Quality Certificate 1
5.3 Storage
The transmitter should be stored in dry and ventilative room with ambient
temperature -20℃~85℃，relative humidity no more than 85% and the air
in the room without corrosive gas.
6 Operation、Maintenance and Fault Diagnosis
6.1 Operation
a) The customer could operate the transmitter without adjustment.
b) Please be sure that the installation and electrical connection are
correct or not before operation.
c) Connect the excitation and operate.
d) The transmitter could work at once as soon as it is connected with
excitation, but the output signal could be more reliable after 30
minutes.

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6.2 Maintenance
MPM489WZ3 Submersible Level Transmitter does not need to be
maintained regularly, but please pay attention to items as follow for better
operating effect and reliability.
a) Check wire connection is reliable or not, and the cable is broken and
old or not.
b) Clean the protection cap and diaphragm cavity periodically(take
care!)
c) Don’t violently pull cables or poke the diaphragm with metal or other
hard objects.
6.3 Fault Diagnosis
MPM489WZ3 Submersible Level Transmitter is integrative full-sealed
construction without movable parts inside, owning advantage of
long-term stability and reliability.
If some failure occur, such as no output, output too big or too small and
unreliable, please turn off the excitation firstly, then check the installation
and wire connection conform with the operation manual or not, the
excitation is correct or not and the reference tube is unobstructed or not.
If unsuccessful, the transmitter may be destroyed, please contact our
company.

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7 Responsibility
Within one year from the delivery date, we shall repair or replace the
instrument with any quality fault caused by material parts or our
manufacturing technique free of charge. For non-quality malfunction
during user’s operation, we are in charge of repair. The material cost and
the shuttle transportation fees should be borne by users.