Microsensor MPM4841 User manual

MPM4841
Operation Manual

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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Thanks for your using products from MICROSENSOR. MPM4841
Pressure Transmitter is one of precise instruments. We suggest you to
read this manual carefully before use.
1 Introduction
MPM4841 pressure transmitter is new pressure transmitter developed by
our company. A piezo-resistive pressure sensor with 316L isolated
diaphragm is mounted with the high-performance signal processing
circuit in the stainless steel housing. The Sensor is automatically tested
by computer and compensated zero and temperature in wide range by
laser trimming system. The digital circuit processes the sensor signal into
standard output signal.
The product is suitable widely for pressure measurement of petroleum,
chemi-industry, metallurgy, electric power, light industry, cottoncracy,
building material, hydrogeology and other country economic fields.
2 Specifications
Pressure Range:Type A：0bar~0.35bar…200bar
Type B：0bar~250bar…600bar
Overpressure: ≤2 times FS
Pressure Type: Gauge, Absolute or Sealed gauge
Accuracy: ≤±0.25%FS ≤±0.5%FS ≤±1%FS
Note: The precision of products is related to the range of measurement,

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and the precision of products in different range is different.
Long-term Stability: ≤±0.3%FS/year
Zero Temperature Drift: ±0.05%FS/℃ (≤1bar); ±0.02%FS/℃(＞1bar)
FS Temperature Drift: ±0.05%FS/℃ (≤1bar); ±0.02%FS/℃(＞1bar)
Power Supply: 8V~30VDC (2-wire); 12V~30VDC (3-wire)
Signal Output: 4mA~20mADC (2-wire);
0/1V～5/10VDC (3-wire); 0.5V～4.5VDC (3-wire)
Operation Temperature: -30℃~80℃ (4-pin Plug, M12x1 Plug）
-20℃~70℃（cable material: PE, PVC）
-20℃~80℃ (cable material: PUR)
Storage Temperature: -40℃~120℃ -20℃~ 85℃ (Cable type)
Resistance: ≤(U-11)/0.02(Ω)（2-wire）; ≥10kΩ（3-wire）
Pressure Port: M20×1.5 Male with Waterline Seal
Housing Protection: IP65
Weight: A: ≤200g
B: ≤250g
3 Outline Construction and Installation
Unit:mm
3.1 Construction and Mounting Dimension

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B1：
SW19
(50)
(78)
27
SW27
G1/8
30
SW19
2 7
S W 2 7
30
G 1 / 8
( 5 0 )
(105)
B2:
G1/8
27
17.5
60.5
SW27
SW27
27
G 1 /8
17.5
90.5

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B4：
Fig. 1
3.2 Installation
3.2.1 Check before Installation
a) The measuring pressure is in the measurement range;
b) The measuring medium is compatible with construction;
c) The measuring medium would not jam the pressure-leading hole.
3.2.2 Installation Method
Usually the transmitter should be mounted vertically up to the horizontal
direction. If the condition is unavailable, the allowed max. mount slope
angle from transmitter to the horizontal direction is 30 degree. It is not
recommended to mount the transmitter invertedly.
Take the pressure port M20×1.5 male with water line sealing of
MPM4841 pressure transmitter as an example, it can be directly installed
on the measuring pipe joint. In order to facilitate the installation and
G1/8
SW27
27
M12×1
54
G1/8
SW27
27
M12×1
84

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maintenance, should be install shut-off valve between the connector and
the pipeline (see Fig. 2).
Caution：do not poke the pressure-leading hole with metal wire or
something hard; and do not press the diaphragm with finger or
something sharp to protect the diaphragm.
The recommended method is to see Fig.2.
Pressure Transmitter
Valve
Pipe
Fig. 2
4 Electric Connection
4.1 The transmitter is connected with the outside circuit
through plug or special cable.
The pin arrangements of socket are to see Fig. 3, and pin definitions are
as follows：

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Pin 2-wire 3-wire
1 +V +V
2 OV/+OUT GND
3 Null +OUT
Fig. 3
The electric definitions of cable are as follow：
Cable 2-wire 3-wire
Red +V +V
Black OV/+OUT GND
White Null +OUT
Note: The tube in the center of the cable can not be blocked or water infl
ow, and it must be connected to the atmosphere, to ensure the pr
otection of the product and the accuracy of the output measureme
nt.
The electric definitions of M12x1 Plug are as follow
Fig. 4
4.2 Plug connection Operation Method：
a) If the plug has been connected with transmitter, loose the central
Pin 2-wire 3-wire
1 +V +V
2 Null GND
3 OV/+OUT +OUT
1818
1818
33.533.5
21
3
10A
250V
12
3
4

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bolt on the top of plug with little screwdriver and pull out the plug
from transmitter.
b) To disconnect the plug, please take out the central bolt on the top
of plug, then turn the plug to the bottom and insert a little flat
screwdriver into a corner signed “Lift” and give a force. The plug
core will be disconnected with housing.
c) To connect the cable, put the cable through the cable jack and
connect the wires with terminals on the plug core correctly (the
connection terminals are signed with clear numbers). Please
choose Φ4.9mm shield cable and connect the cable reliably to
prevent short circuit.
d) Pull the cable slightly and push the plug core into housing (a
rattling sound could be listened), then screw down the cable-fixed
nut.
e) To remove the cable, loose the cable-fixed nut to relax the cable,
and operate as Item2 to disconnect the plug. Take out the cable
from terminals with little screwdriver and pull out the cable from
cable-fixed nut, then renew the connection between plug core,
plug and socket.
Caution: renew the rectangle-ring to the pre-mounting situation in order
tomaintain the protection class when connect plug and socket.
5 Unpacking、Components and Storage

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5.1 Unpacking
a) Be sure the package is completed, and the package should be put
as the sign “UP”.
b) Be sure unpacking carefully, and prevent damaging instruments or
accessories. Pay attention to the housing jacket and rubber
bushing of transmitter cable.
5.2 Enclosed
The transmitter should be enclosed when out of factory：
MPM4841 Pressure Transmitter 1
Special Plug 1
Production Manual 1
Production Qualification Certificate 1
5.3 Storage
The transmitter should be stored in dry ventilate room, ambient
temperature -40℃~120℃ -20℃~ 85℃ (Cable type) and the relative
humidity≤85%, no corrosive substance in the room.
6 Operation、Maintenance and Responsibility
6.1 Operation
The user could operate the transmitter without any adjustment. Be sure
the installation and electric connection are correct.
The transmitter could work at once as soon as the power is supplied. But
the signal output will be more stable after 30 minutes.

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6.2 Maintenance
MPM4841 pressure transmitter is the compact measurement device,
please pay attention to the following items in the operation:
a) If the pressure-leading hole is jammed or the diaphragm is dirty,
please clean them with impregnant which is compatible with
transmitter construction material. Do not poke pressure-leading
hole with hard object or brush diaphragm.
b) Other cable in the transmitter is for our company’s adjustments, do
not connect it at will to protect the transmitter.
c) The transmitter and the external circuit connect through the speci
al plug seat, When the installation of electrical connection is comp
leted, be sure to tighten the socket nut and cable fastening nut to
ensure that the transmitter protection level.
7 Responsibility
Within one year from the delivery date, we shall 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. But the material cost and the
shuttle transportation fees should be borne by users.