Microsensor MPM489WZ1 User manual

V1.0
MPM489WZ1
Operation Manual

Thank you very much for selecting Micro Sensor’s product, please
carefully read this operation manual before using the product.
1 Introduction
MPM489WZ1 is a Φ19mm diameter fully sealed submersible level
transmitter based on diffused-silicone principle. It consists of a high
stable and reliable piezoresistive pressure sensing element and the
special PCB component as well as the stainless steel housing. Its
integrated construction and standardized signal output greatly facilitate
the operation and automation control at work sites. The special vented
cable being hermetically connected with the transmitter housing allows
the transmitter for long term use in the liquids that are compatible with
the transmitter construction material.
The protection class of MPM489WZ1 Level Transmitter is IP68.
For easier local installation and observation at work site, the connection
box and indicator are available according to customers’ option.
Product measurement tools type approval No. 15F139-61.
2 Features
MPM489WZ1 Level Transmitter has advantages featuring compact size,
light weight and good long-term stability without need of adjustment. It

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can be widely used for liquid level measurement and control in fields of
petroleum, chemi-industry, medicine, metallurgy, power station, mining,
urban water supply, drainage and hydrology survey, etc.
3 Specification
Pressure Range: 10m, 20m, 50m, 100m,200mH2O
Overpressure: 1.5 times FS
Accuracy: ±0.5%FS
Stability: Range＞20mH2O，±0.2％FS/year
Range≤20mH2O，20mmH2O
Operation temp.: -10℃~70℃
Storage Temp.: -20℃~85℃
Power Supply: 11V~28V DC
Output Signal: 4mA~20mA DC（two wire）
Load (Ω): ≤ (U-11)/0.02（Ω）
Insulated Resistance: 500VDC，20MΩ
4 Construction Material
Housing: 1Cr18Ni9Ti Cap: Black Nylon
O- ring: Viton Rubber casing: Chloroprene Rubber
Cable: Φ7.5mm PE cable with vented tube Diaphragm: SS 316L
Connection Box: Cast aluminium (ZL102)/ PBT
5 Outline Dimension of transmitter
5.1 The outline dimension is showed as Figure 1:(unit:mm)

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Cable length: the maximum length is 300m.
Figure 1
5.2 Connection Box Dimension(see Figure 2).
Connection box ：Please note it in the order if the connection box is
required.
Indicator: Connection box Ye is available with the indicator upon the
customer request.
Mounting hole 2-M6
Depth 10
～1 4 0
Φ7 2
10 3
4 0
Φ8 4
Mounting hole 2-M6
Depth 10
～1 4 0
Φ8 0
Φ8 4
4 0
45
Connection box Yb Connection box Ye

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54
12
SW27
10
17
108
85
85
118
35
72
38 16
Connection box Yc
Figure2
6 Electrical Connection
6.1 Wiring
6.2 Electrical connection for 4mA~20mA DC output transmitter
6.3 Electrical connection for transmitter with connection box:
Wire Color
Definition
Black
+V
Red
0V/+OUT

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There is a terminal connection board inside the transmitter connection
box, and their definition is indicated below.
6.4 Notes
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. Be sure no water or
other liquid flows into the reference tube and damages the
transmitter.
b) If the product is installed in the thunderstorm area, the
Lightning-proof Protection Device is suggested to protect transmitter.
7 Unpacking, Enclosed Shipment and Storage
7.1 Unpacking
+V
OV/+OUT
red black

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Attention:
a) Check and make sure the package in good condition and the box
should be put as the sign “up”.
b) Striking the package violently is forbidden to avoid damages to
instruments or accessory. Please be sure the cable casing and
rubber sheath are well protected.
7.2 Enclosed Shipment
When delivery, the transmitter includes:
MPM489WZ1 Level Transmitter 1
PE Cable(connected with transmitter) the ordered length
Connection Box（connected with cable）comply with the order
Indicator（in connection box Ye）comply with the order
Product Operation Manual 1
Product Quality Certificate 1
7.3 Storage
The transmitter should be stored in dry and ventilated room with ambient
temperature -20℃~85℃，relative humidity no more than 85% and the air
in the room without corrosive gas.
8 Installation
8.1 Inspection before Installation
Notes:

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a) Whether the static pressure produced by the liquid at installation
place exceeds the transmitter FS or not.
b) Whether the measuring liquid is compatible with the transmitter
construction material or not.
c) Whether the measuring liquid can jam the holes on the protection
cap or not.
8.2 Installation Methods
The transmitter should be installed vertically down.
In the flowing water, the acted surface should be parallel with the water
flowing direction.
8.2.1 Installation in the Static Water
The installation method in the static water see Figure 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 Figure 4, protected by steel tube.
The installation method in the deep well see Figure 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
wire.

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Figure 3 Figure 4
8.2.2 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 Figure 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 Figure 6).
Figure 5 Figure 6

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Method three: see Figure 7.
This method can not only clear water flowing pressure and wave
influence, but also filter the sand and mud.
Figure 7
9 Operation、Maintenance and Fault Diagnosis
9.1 Operation
a) The customer could operate the transmitter without adjustment.
b) Please be sure that the installation and electrical connection are
correct.
c) Connect to power 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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9.2 Maintenance
MPM489WZ1 Level Transmitter does not need to be maintained
regularly, but please pay attention to items in the below 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 (be
careful!)
c) Don’t violently pull cables or poke the diaphragm with metal or other
hard objects.
9.3 Fault Diagnosis
MPM489WZ1 Level Transmitter use integrative full-sealed construction
without movable parts inside, have advantages of long-term stability and
reliability.
If some failure occur, such as no output, output too big or too small or
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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10 Ordering Note
a) The pressure range of transmitter should not be less than the max.
static pressure of the measured level. The length of cable should be
reserved enough.
b) The supply power and digital display indicator can be provided if
required, please note in the order.
c) Please order according to the range, output signal, cable length and
connection box required.
d) Water-proof connection box is available. If the transmitter is used in
the thunderstorms area., the PD100 dual-circuit transmitter
protection device can be used to protect the product from
high-voltage breakdown due to the weather.
11 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. However, The
material cost and the shuttle transportation fees should be borne by
users.