Microsensor MPM436W User manual

V1.0
MPM436W
Operation Manual

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Thanks for your using products from MICROSENSOR. MPM436W Lower
Range Submersible Level Transmitter is a full-sealed immersiable low range
capacitive transmitter. We suggest you to read this manual carefully before use.
1 Introduction
MPM436W Lower Range Submersible Level Transmitter uses high reliable and
tested ceramic capacitive sensor and special circuit, which is installed into a
stainless steel housing. With its integrated stainless steel full-sealed
construction, compact size, high stability, overpressure up to 80 times of FS and
good anti-corrosive. The MPM436W transmitter can be widely used for low
liquids level measurements and controls in the fields of petroleum,
chemi-industry, power factory, mine, city water supply etc.
2 Specifications
Pressure Range: 0…0.5 mH2O~0…2mH2O
Overpressure: 10×FS
Power Supply: 15V~28VDC 15V～28VDC
Output Signal: 4mA~20mADC(2-wire) 0V~5VDC(3-wire)
Load Resistor: RL≤((U-15V)/20mA)-Rwire(kΩ) ＞5kΩ
U=power supply, Rwire=wire resistor value
Accuracy (including lin.+rep.+hys.): ±0.5%FS(min.) ±1.0%FS(max.)
Media Temperature: -30℃~+70℃
Storage Temperature:-30℃~+85℃
Protection:IP68
Materials contact with media:

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Housing: Stainless steel1Cr18Ni9Ti
Diaphragm: Ceramic
Sealing part: Viton
Rubber casing: NBR
Cable: Φ7.2mm, Polyethylene(or Polyurethane),
integrated reference tube
3 Construction and install dimmension
3.1 Outline dimension (Unit:mm)
Figure 1
3.2 Installation
The product has been made calibration and inspection according to the
specifications and contract requirements before out of factory, it is no need to
go further calibration before installation.

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Attention before installation:
a) The possible line pressure at the installation point shall not be over the
pressure range.
b) The measuring media shall be compatible with the transmitter
materials.
c) The transmitter pressure connection hole shall not be clogged with the
measuring media.
d) Be sure the vented cable is clear and going through to the atmosphere
without any dirt. In case any water or liquids into the vented cable, it
may damage the transmitter.
e) The transmitter shall be installed downwards vertically.
3.3 Installation Method
Installation in still water (see Figure 2.):
The transmitter shall be located far from the water access to avoid the shock
from the water bump, as it may damage the transmitter.
s e d i m e n t
E l e c t n i c a l C o n n e c t i o n B o x
Control Room
F i x e d M o u n t
Figure2 still water installation

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Installation in deep well (see Figure3.):
It is recommend to use a straight steel pipe Ф>50mm and punch several holes
in the pipe.
Electnical Connection Box
Fastener
Control Room
Figure3. Installation in deep well
E l e c t n i ca l C o n n e c t io n B o x
Figure4 Installation in flowing water

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Installation in flowing water such as river, reservoir, etc.
Be sure the sensor diaphragm is parallel with the water flowing direction.
a) See Figure 4., It is recommend to insert a steel pipe and punch several
holes on it, so as to avoid water wave or shock on the sensor
diaphragm.
b) See Figure 5, It is better to cover the transmitter lightly into clear
sandy or pebbly water.
c) See Figure 6, It is a good way for avoiding any possible water wave or
shock on the transmitter. And this can also leach dirt or sands in the
water.
ELectnical Connection Box
Figure5 Installation in pebbly water

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A i r C h a m b e r
d a m p i n g
Figure6 Installation in Flowing Water
4 Electrical connection
After installation, please make electrical connection as mentioned on each
product certificate card, and take reference as below Figure7 or Figure8.
Two-wire, the electrical connection method of transmitter output 4~20mADC to
see Figure7:
Figure7
Three-wire, the electrical connection method of transmitter output 0~5VDC to
see Figure8:

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Figure8
5 Attentions
a) Before using the transmitter. Please firstly read this operating manual
and do the connections accordingly.
b) Be sure power supply is within the permitted range before giving
power.
c) Do not pull the cable strongly.
d) The housing shall be grounded to avoid strong interference.
e) It is recommend to install a lightning-protection device.
f) The sensor diaphragm is extremely delicate, it must never be touched
as this can destroy the element.
6 Troubles & Solutions
In case the transmitter is in any abnormal operation, please cut off the
transmitter immediately and check as follows:
6.1 Failure: No signal output with power supply
Possible solve steps:
a) If power supply is in range: 15V~28VDC.

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b) If the positive and negative polarity of transmitter power voltage is at
right connections (see Figure7or Figure8.).
c) If the connection wires is grounded well.
6.2 Failure: Abnormal Outputs
Possible solve steps:
a) If power supply voltage is fit well.
b) If current pressure range is within the permitted range.
c) If the vented cable is clear to the atmosphere.
d) If the transmitter is grounded well.
6.3 Failure: output is in bad linearity.
Possible solve steps:
a) If pressure sources is stable and connections are sealed well.
b) If the transmitter has a proper load.
c) If the sensor is good without any damage.
In case the failures can not be solved as above steps, please contact the factory.
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.