Microsensor MPM483DM User manual

MPM483DM
Operation Manual

Table of Contents
1 Introduction .......................................................................................3
2 Specifications....................................................................................4
3 Outline Structure and Installation.......................................................5
4 Electrical Connection.........................................................................8
5 Unpacking Componets and Storage ................................................ 11
6 Supporting Software........................................................................13
7 Transmitter Parameter Settings and Usage......................................14
8 Operation Maintenance and Responsibility......................................18
AppendixA..........................................................................................20
The company reserves the right to modify this manual due to product technology
and process updates. Further notice will not be made for any changes.
Please note the latest version of this manual.
The company reserves the right of final interpretation of this manual.
Version of this manual: V1.0.

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Thank you very much for selecting Micro Sensor’s product, MPM483DM
intelligent digital display pressure transmitter is a precision instrument, in
order to better use this product, it is recommended that you read this
manual carefully before using the product.
1Introduction
MPM483DM intelligent digital display pressure transmitter is a
high-precision, high-stability intelligent digital display transmitter product
launched by our company. It is suitable for real-time pressure
measurement and display. The product adopts the latest application
results of special wide temperature liquid crystal display and digital
technology in the field of sensor manufacturing, combined with advanced
piezoresistive pressure transmitter design and manufacturing technology,
and carefully built by precision digital temperature compensation and
nonlinear correction technology to ensure high accuracy and high
stability of pressure measurement.
MPM483DM intelligent digital display pressure transmitter has passed
the intrinsic safety and flameproof certification, in line with the national
standard GB/T 3836.1 "Explosive atmospheres - Part 1: Equipment -
General requirements" suitable for general explosive gas atmospheres.
The flameproof type complies with the provisions of GB 3836.1-2010
"Explosive atmospheres - Part 1: General requirements for equipment"

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and GB 3836.2-2010 "Explosive atmospheres - Part 2: Equipment
protected by flameproof enclosure "d". Explosion-proof mark: Exd IICT6
Gb.
Intrinsically safe products meet the relevant requirements of GB/T
3836.1-2021 "Explosive atmospheres - Part 1: Equipment - General
requirements" and GB/T 3836.4-2021 "Explosive atmospheres - Part 4:
Equipment protected by intrinsically safe type "i", the explosion-proof
mark is Exia IICT4 Ga, intrinsically safe transmitters are suitable for
areas 0, 1 and 2 where there is an explosive mixture of IIA, IIB, IIC,
T1~T4 group flammable gases, steam and air mixture.
2 Specifications
Measurement Range:-1bar…0bar～100mbar…1000bar
Overpressure：1.5 times FS or 1100bar(minimum value is valid)
Comprehensive accuracy：
Pressure
Type
Range
Accuracy
Gauge (G)
0mbar~100mbar＜X＜200mbar
±0.5FS%
200mbar≤X≤700mbar
±0.25FS%
700mbar＜X≤35bar
±0.25FS%(default)
±0.1FS%
-1bar~-350mbar＜X≤2bar
±0.5FS%
-1bar~-350mbar＜X＜2bar~35bar
±0.25FS%
Absolute (A)
0mbar~700mbar＜X≤1bar
±0.5FS%
Table 1

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Power Supply: 8V~28V DC (The intrinsically safe type is powered by a
safety barrier)
Output Signals: analogue 4mA~20mA DC (2-wire); digital RS485
interface
Display Range: -19999 ~ 19999 (4 and half digits LCD display)
Load Resistance: (U-8V) /0.02A (Ω) (U is the supply power)
Compensated Temperature: -10℃~ 70℃
Application Temperature: -30℃~ 80℃(non-explosive type and intrinsic
safety type)
-30℃~ 60℃(flameproof type)
Storage Temperature: -40℃~85℃
Insulation Resistance: 100MΩ@100V
Long-term Stability: ±0.25%FS/year
Vibration: 10g, 20Hz~2000Hz
Shock：20g, 11ms
Housing Protection: IP65
3 Outline Structure and Installation
3.1 Outline dimensions unit:mm
1bar＜X≤10bar
±0.25FS%
10bar＜X≤1000bar
±0.25FS%(default)
±0.1FS%
Sealed
gauge (S)
35bar＜X≤1000bar
±0.25FS%(default)
±0.1FS%

6
34
(120)
SW27
(105)
( 68)
3.2 Installation
3.2.1 Check before Installation
Before installing the transmitter, please pay attention to:
a) Whether the pressure of the measured point will exceed the
measuring range of the transmitter.
b) Whether the measured medium is suitable for the wetted parts of the
transmitter.
c) Whether the measured medium will block the impulse hole of the
transmitter.
3.2.2 Installation Method
In general, the transmitter should be mounted upwards perpendicular to
the horizontal orientation (inverted mounting may affect the zero output
of the transmitter)
The pressure interface of the standard MPM483DM pressure transmitter
Fig 1

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is M20×1.5 male thread, and the sealing gasket should be used for
installation; The pressure interface of the flush diaphragm MPM483DM
pressure transmitter is G1/2 male thread with gasket, and the effective
depth of the G1/2 internal thread of the user-mounted interface should
not be less than 15mm.
The transmitter can be mounted directly on the flange joint of the
measuring pipe. In order to facilitate installation and maintenance, a
globe valve should be installed between the flange joint and the pipeline
as shown. When installing, please pay attention to:
a) Do not poke the hole with a sharp object or hard object, and do not
press the diaphragm with your hands, etc. to avoid damaging the
diaphragm.
b) Flush diaphragm pressure transmitter interface with plastic protective
cap, do not remove it unless installed and used, so as not to damage
the diaphragm.
c) Do not seal the connection with the G1/2 male thread of the pressure
interface of the flush diaphragm transmitter by winding tape, which
may generate stress that affects the measurement stability or even
damages the transmitter.
d) When installing and using this product in areas where lightning often
occurs, it is recommended that it is best to install lightning protection
device into the line.

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Note: It is strictly forbidden to poke the pressure hole or press the
diaphragm with hard objects such as iron wire and steel needle to avoid
damage to the transmitter.
4 Electrical Connection
4.1 Connection Steps
a) Unscrew the back cover of the electronic shell and insert the cable
through the cable hole with a sealing sleeve (the cable with an outer
diameter of φ7.4mm matches the cable envelope well);
b) Connect the cable conductor to the terminal block according to the
position shown in the electrical connection diagram, and tighten the
screws;
c) Finally tighten the cable gland nut and back cover (to prevent moisture
from entering the transmitter).
4.2 Terminal Definition
+
A- B+ -
A
+ - + -
Fig 2

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Table 2
4.3 Intrinsically safe transmitter electrical connection method and
precautions:
a) Product installation should be carried out in accordance with the
relevant provisions of GB/T3836.15-2017 "Explosive Atmospheres
Part 15: Design, Selection and Installation of Electrical Installations".
And the installation is carried out by professionals. Products that have
passed explosion-proof certification are not allowed to replace or
change components and structures that affect explosion-proof
performance at will.
b) This product must be used with the explosion-proof certificate safety
barrier, and the explosion-proof mark level of the safety barrier must
Wiring definition
terminal
definition
Terminal
definition
+/A
V+
+/A
V+
-/B
+OUT
-/B
+OUT
RS485A
RS485B

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not be lower than the explosion-proof mark of the transmitter. The
safety barrier shall be installed in a safe place, and its installation, use
and maintenance must comply with the safety barrier instruction
manual.
c) When this product is used in hazardous places, the wiring diagram is
shown in the figure below, and the product shell must be reliably
grounded during installation.
d) Intrinsically safe type use warning: the product shell material is
aluminum, the base is stainless steel and other metal materials, when
used in zone 0, to prevent ignition hazard caused by impact or friction
Dangerous area
V+ Power
Load
Safe
barrier
Safe area
8～28V DC
RS485
interface
+OUT
RS485A
RS485B
P
I
Fig 3
Intrinsically safe transmitter explosion-proof mark：Ex ia IIC T4 Ga
Transmitter with Flameproof mark: Ex d IIC T6 Gb
Transmitter intrinsically safe parameters：

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Supply power：Ui:28V、Ii:93mA、Pi：0.651W、Ci：6.7nF、Li:0mH
RS485 signals：Ui:6.6V 、Ii:65mA、Pi：0.11W、Ci：6.8μF、Li:0mH
Uo:6.51V 、Io:75mA、Po：0.13W、Co：5μF、Lo:6.3mH
Intrinsically safe system parameter matching must follow the following
guidelines：
Uo≤Ui; Io≤Ii; Po≤ Pi;Cc ≤ Co－Ci；Lc≤Lo－Li
Cc, Lc: Cable (or wire) between the safety barrier and the
intrinsically safe product allows the total maximum distribution of
capacitance and inductance
Uo: the maximum voltage output of the safety barrier
Io: the maximum current output of the safety barrier
Po：the maximum power output of the safety barrier
Lo：the maximum allowable external inductance of the safety barrier
Co: the maximum allowable external capacitance of the safety
barrier
Ui：the highest input voltage of the intrinsically safe transmitter
Ii：the highest input current of the intrinsically safe transmitter
Pi：the highest input power of the intrinsically safe transmitter
Li：maximum internal inductance of intrinsically safe transmitters
Ci：maximum internal capacitance of intrinsically safe transmitters,
The detailed meaning of the symbols is shown in the GB/T 3836.4-2021
standard.

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When the product is used in the "0" area, the power transformer
supplying power to the safety barrier must meet GB/T 3836.4-2021.
4.4 Flameproof transmitter electrical connection method and precautions
a) Check whether the explosion-proof nameplate of the transmitter has
the ExdII.CT6 Gb explosion-proof mark, and whether the explosive
mixture in the place of use complies with the corresponding level
specified.
b) When installing the transmitter, the following requirements must be
met:
1) The waterproof joint must be tightened.
2) The flameproof structure and parts of the flameproof transmitter
are strictly inspected before leaving the factory, so the joint
surface should not be scratched, touched, and the flameproof
parts should not be self-equipped when used, and if there is
damage, it should be ordered from the manufacturer in time.
3) Lead the cable to a safe place to split the core, and it is strictly
forbidden to split the core in the middle.
5 Unpacking、Components and Storage
5.1 unpacking
When unpacking, please pay attention to:
a) Check whether the box is intact first, and the box body should be

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placed according to the "up" sign.
b) Avoid strong knocking when unpacking to prevent damage to the
meter or accessories.
5.2 Components
The transmitter should be enclosed when out of factory：
MPM483DM pressure transmitter 1
Production Manual 1
Production Qualification Certificate 1
5.3 Storage
The transmitter should be stored in a dry and ventilated room with an
ambient temperature of -40 °C ~ 85 °C and a relative humidity of not
more than 85%, and the indoor room does not contain corrosive
substances to the structural materials of the transmitter.
6.Supporting Software
MS Setonline Software
For transmitter with RS485 interface, through the RS485 conversion
module, users can read the internal basic information (including model,
ID number, range, unit, etc.), display the pressure value, zero operation,
set the analog output, set the instrument address, etc.
Note: MS Setonline control software, can be downloaded from our
company’s website www.microsensorcorp.com

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Fig 4
7 Transmitter Parameter Settings and Usage
7.1 Display and key instructions
The two buttons on the front panel of the transmitter are "SET" and "∧".
The "∧" key is used to modify each parameter item. The "SET" key is
used to select each function parameter and confirm parameter
modification.
7.2 Basic parameter settings
When the transmitter leaves the factory, the transmitter has been set up
and adjusted according to the user's requirements, and the user can use
it directly. However, according to the site situation, users can modify

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some parameters, settings and adjust according to steps 7.2 and 7.3.
7.2.1 In the measurement state, press the "SET" key for about 3s, the
transmitter secondary screen displays "PASS", the main screen displays
"1980", press "∧" and "∧+SET", change the password to "1993", and
then press the "SET" key to confirm, the instrument displays the first
basic parameter symbol.As shown in the following figure:
In measurement
1980
PASS
SET
1993
PASS
SET
∧/ ∧+SET
Enter Password
0.0
Poin
∧
Adjust Display Precision
SET

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SET
XXXXX
dPL
XXXXX
dPH
SET
∧/ ∧+SET
∧/ ∧+SET
Zero Point Setting
Span Point Setting
XXXXX
dAL
∧/ ∧+SET
XXXXX
dAH
SET
∧/ ∧+SET
Pressure Corresponds
to 20mA Output
XXXXX
ZEro
SET
∧/long press ∧
Setting Zero/Cancel Setting Zero
SET
Pressure Corresponds
to 4mA Output

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∧
1200/…9600
bArd
SET
∧
Baud Rate Setting
01/…99
Addr
SET
∧/ ∧+SET
Transmitter Address Setting
SET
SET
XXXX
dA0F
∧/ ∧+SET
4mA output micro adjust
kPa/…
Unit
Pressure Unit Setting
XXXX
dAFF
∧/ ∧+SET
20mA output micro adjust
yES/no
FAct
SET
∧
Whether to factory reset
SET
∧/ ∧+SET
∧

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7.2.2 In the parameter modification status, after modifying the current
parameter value by "∧" or "∧+SET", press "SET" to confirm, and the
prompt of the next parameter is displayed automatically.
7.2.3 Repeat the above two steps. After completing all parameter
operations, enter the "End" menu, and the transmitter will automatically
save the Settings and return to the measurement state.
7.2.4 Under the basic parameter setting state, if no key is pressed within
30 seconds, the transmitter will return to the measurement state.
7.2.5 If the user chooses to restore Factory Settings, the transmitter will
restore factory basic parameter Settings.
7.2.6 The number of menus varies according to the selected product
model.
Note: When adjusting the parameters of standard 4mA output fine-tuning
and 20mA output fine-tuning, ammeter should be connected in series in
the loop to monitor the loop current and adjust the 4mA output current
and 20mA output current accurately.
7.3 Instructions for Use
XXXXX
-End-

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The transmitter displays the transmitter model and software version
number at power-up, then enters the measurement status and the main
display displays the current pressure value of the transmitter. The
secondary screen displays maximum, minimum, percentage, output
current indication, temperature value, and units.
a) In the measurement state, press the "∧" button (no more than 2s),
and the secondary screen will display the maximum value, minimum
value, percentage, output current value, temperature value and unit in
turn.
b) In the measurement state, long press the "∧" button (more than 2s),
the transmitter will clear the current maximum and minimum value
records of the secondary screen and restart the peak record.
c) For battery-powered type, the backlight is turned on after any key
operation. 30s buttonless operation, transmitter will turn off the
backlight.
8 Operation、Maintenance and Responsibility
8.1 Safety Barrier Select Requirements
The safety barrier is freely purchased by the user, as long as the
parameters meet the above requirements and have an explosion-proof
certificate. The installation and use of the safety barrier should be carried
out in accordance with the safety barrier instruction manual.

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8.2 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. 。
8.3 Maintenance
MPM483DM pressure transmitter is a compact measurement device
please pay attention to the following items in the operation:
a) If the impulse hole is blocked or the diaphragm is fouled, clean it with a
solvent compatible with the transmitter construction material. Do not
poke the lead hole with a hard object or brush the diaphragm.
b) Other wires in the transmitter are for our company's debugging and
use, users should not connect to avoid damage to the transmitter.
c) After the electrical connection is completed, be sure to tighten the
socket nut and cable fastening nut to ensure the protection level of the
transmitter.
8.4 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. But the material cost
and the shuttle transportation fees should be borne by users.